WO1998044567A1 - Dispositif de memoire remanente a semi-conducteur, dispositif a semi-conducteur et procedes de fabrication associes de ceux-ci - Google Patents
Dispositif de memoire remanente a semi-conducteur, dispositif a semi-conducteur et procedes de fabrication associes de ceux-ci Download PDFInfo
- Publication number
- WO1998044567A1 WO1998044567A1 PCT/JP1998/000710 JP9800710W WO9844567A1 WO 1998044567 A1 WO1998044567 A1 WO 1998044567A1 JP 9800710 W JP9800710 W JP 9800710W WO 9844567 A1 WO9844567 A1 WO 9844567A1
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- Prior art keywords
- insulating film
- gate electrode
- semiconductor device
- floating gate
- film
- Prior art date
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Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/10—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the top-view layout
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- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/04—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS
- G11C16/0466—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells with charge storage in an insulating layer, e.g. metal-nitride-oxide-silicon [MNOS], silicon-oxide-nitride-oxide-silicon [SONOS]
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/04—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body
- H01L27/10—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including a plurality of individual components in a repetitive configuration
- H01L27/105—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including a plurality of individual components in a repetitive configuration including field-effect components
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/401—Multistep manufacturing processes
- H01L29/4011—Multistep manufacturing processes for data storage electrodes
- H01L29/40114—Multistep manufacturing processes for data storage electrodes the electrodes comprising a conductor-insulator-conductor-insulator-semiconductor structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66825—Unipolar field-effect transistors with an insulated gate, i.e. MISFET with a floating gate
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/40—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the peripheral circuit region
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/40—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the peripheral circuit region
- H10B41/41—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the peripheral circuit region of a memory region comprising a cell select transistor, e.g. NAND
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/40—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the peripheral circuit region
- H10B41/42—Simultaneous manufacture of periphery and memory cells
- H10B41/49—Simultaneous manufacture of periphery and memory cells comprising different types of peripheral transistor
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B69/00—Erasable-and-programmable ROM [EPROM] devices not provided for in groups H10B41/00 - H10B63/00, e.g. ultraviolet erasable-and-programmable ROM [UVEPROM] devices
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/56—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency
- G11C11/5621—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency using charge storage in a floating gate
- G11C11/5628—Programming or writing circuits; Data input circuits
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/06—Auxiliary circuits, e.g. for writing into memory
- G11C16/34—Determination of programming status, e.g. threshold voltage, overprogramming or underprogramming, retention
- G11C16/3436—Arrangements for verifying correct programming or erasure
- G11C16/3454—Arrangements for verifying correct programming or for detecting overprogrammed cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/28008—Making conductor-insulator-semiconductor electrodes
- H01L21/28017—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon
- H01L21/28026—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor
- H01L21/28035—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor the final conductor layer next to the insulator being silicon, e.g. polysilicon, with or without impurities
- H01L21/28044—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor the final conductor layer next to the insulator being silicon, e.g. polysilicon, with or without impurities the conductor comprising at least another non-silicon conductive layer
- H01L21/28061—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor the final conductor layer next to the insulator being silicon, e.g. polysilicon, with or without impurities the conductor comprising at least another non-silicon conductive layer the conductor comprising a metal or metal silicide formed by deposition, e.g. sputter deposition, i.e. without a silicidation reaction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66568—Lateral single gate silicon transistors
- H01L29/66575—Lateral single gate silicon transistors where the source and drain or source and drain extensions are self-aligned to the sides of the gate
- H01L29/6659—Lateral single gate silicon transistors where the source and drain or source and drain extensions are self-aligned to the sides of the gate with both lightly doped source and drain extensions and source and drain self-aligned to the sides of the gate, e.g. lightly doped drain [LDD] MOSFET, double diffused drain [DDD] MOSFET
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7833—Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/40—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the peripheral circuit region
- H10B41/42—Simultaneous manufacture of periphery and memory cells
- H10B41/43—Simultaneous manufacture of periphery and memory cells comprising only one type of peripheral transistor
- H10B41/44—Simultaneous manufacture of periphery and memory cells comprising only one type of peripheral transistor with a control gate layer also being used as part of the peripheral transistor
Definitions
- the present invention relates to a nonvolatile semiconductor memory device and a method for manufacturing the same, and a semiconductor device and a method for manufacturing the same.
- the present invention relates to a semiconductor device and a method of manufacturing the same, and more particularly, to a technique which is effective when applied to miniaturization and increase in capacity of a nonvolatile semiconductor memory device.
- an electrically rewritable nonvolatile semiconductor memory device for example, a so-called AND-type flash memory described in Japanese Patent Application Laid-Open No. 07-27331 is known.
- the above-mentioned publication describes the following manufacturing method as a technique for improving the degree of integration of a transistor called a memory cell existing in a chip.
- a three-layer laminated film of a gate oxide film, a first polycrystalline silicon layer, and a silicon nitride film is deposited on a semiconductor substrate made of single-crystal silicon, and these laminated films are patterned into stripes.
- an n- type impurity ion is implanted into a semiconductor substrate that is not covered by the patterned laminated film, thereby forming a column line of an n-type impurity semiconductor region on the semiconductor substrate surface.
- the silicon oxide film formed by the CVD method is etched by anisotropic dry etching to form a first polycrystalline silicon layer and a silicon nitride film.
- a sidewall spacer is formed on the side wall of the substrate.
- a groove is formed in the semiconductor substrate by anisotropic dry etching using the first polycrystalline silicon layer and the sidewall spacer as a mask.
- the n-type impurity semiconductor region is separated, and a column line and a source line are respectively formed.
- a second polycrystalline silicon layer is deposited (deposited) on the entire surface of the semiconductor substrate, and a silicon nitride film is formed by isotropic dry etching. Etch back the second polysilicon layer until exposed.
- the surface of the etched back second polycrystalline silicon layer is oxidized to be made of polycrystalline silicon covered with a silicon oxide film.
- An element isolation region is formed. Subsequently, the silicon nitride film is removed, a third polycrystalline silicon layer is deposited, and patterning is performed to protect the first polycrystalline silicon layer, thereby forming a floating gate parallel to the column line. Next, an interlayer insulating film and a fourth polycrystalline silicon layer are deposited and patterned to form row lines of the fourth polycrystalline silicon layer perpendicular to the column lines. Thereby, the first and third polysilicon layers are separated from each other, and a floating gate is formed.
- a semiconductor device having a non-volatile storage function is configured by accumulating electrons in a floating gate.
- the formed ⁇ -type impurity semiconductor region becomes a source or drain region.
- Japanese Patent Application Laid-Open No. H06-74734 describes a technique relating to an operation method of a nonvolatile semiconductor memory device.
- a negative voltage is applied to the control gate electrode and a positive voltage is applied to the drain terminal.
- a technique of applying 0 V and selectively writing data by applying 0 V is described.
- Japanese Patent Laid-Open No. 08-107581 discloses reading and writing of a nonvolatile semiconductor memory device. A technique related to increasing the writing speed is described.
- a first floating gate electrode lower layer
- source and drain regions are formed,
- the first floating gate electrode is covered with an insulating film, removed by an etch-back method or a CMP (Chemical Mechanical Polishing) method, and then a second floating gate electrode (upper layer) is formed on the first floating gate electrode. It is formed and manufactured.
- Japanese Patent Application Laid-Open No. 08-148658 discloses a technique relating to a manufacturing method suitable for high integration of a nonvolatile semiconductor memory device.
- Non-volatile described in the publication A non-volatile semiconductor memory device is manufactured by patterning a polycrystalline silicon layer for a floating gate and then forming a polycrystalline silicon layer for a gate electrode of a peripheral circuit and an insulating film so as to ride over the polycrystalline silicon layer.
- Thermal oxidation is used as a method for forming element isolation of memory cells, and it is difficult to ensure the reliability of the gate oxide film due to an excessive heat treatment step after the formation of the gate oxide film. Also, it was difficult to suppress the growth of the impurity semiconductor region due to the heat treatment step.
- the embedded structure is used. Since the polycrystalline silicon layer is used as the embedded material, it is difficult to isolate the high withstand voltage element between the memory cells. .
- Non-volatile semiconductor memory devices such as AND type flash memory disclosed in the prior art disclose a method of forming a memory cell and a MOS transistor of a peripheral circuit arranged on the same semiconductor substrate. Not. Although the miniaturization of memory cells is progressing due to the advancement of additional technology, high voltages are used for writing and erasing operations, so transistors in peripheral circuits are required to have specifications that can withstand high voltages. For example, in a manufacturing method in which an impurity semiconductor region of an M ⁇ S (Metal-Oxide-Semiconductor) transistor in a peripheral circuit is formed after a memory cell is formed, a memory cell that is required to be a shallow junction impurity semiconductor region is used.
- M ⁇ S Metal-Oxide-Semiconductor
- M ⁇ S transistors for memory cell selection are arranged in the memory mat, but there is no description of the formation method.
- the writing and erasing voltages have not been reduced in accordance with miniaturization, and high-voltage operation is required. Therefore, it is necessary to secure element isolation withstand voltage in element isolation of the memory cell and the select transistor section.
- an interlayer insulating film and a control gate electrode material are deposited on the floating gate electrode, and the word line electrode (control) is formed by photolithography and etching processes. Gate electrode).
- the electrode pattern is transferred to the photoresist, a halation phenomenon occurs due to a step of the underlying floating gate electrode, and the pattern shape of the photo resist is partially deformed.
- Japanese Patent Application Laid-Open No. 08-107581 and Japanese Patent Application Laid-Open No. 08-148658 it is possible to some extent to suppress the halation.
- An object of the present invention is to provide a structure of a nonvolatile semiconductor memory device suitable for high integration and a technique for manufacturing the same.
- Another object of the present invention is to increase the storage capacity of a nonvolatile semiconductor memory device.
- Still another object of the present invention is to provide a transistor operation method capable of shortening the gate length of a memory cell.
- Still another object of the present invention is to provide a technology capable of suppressing the reliability of a gate insulating film and suppressing the growth of an impurity semiconductor region without requiring a high-temperature heat treatment for forming an element isolation region. .
- Still another object of the present invention is to provide a technique for increasing the breakdown voltage of an element isolation region.
- Still another object of the present invention is to increase the breakdown voltage of the element isolation region and at the same time to increase the integration density.
- An object of the present invention is to provide a technology capable of realizing integration.
- Still another object of the present invention is to provide a structure of a nonvolatile semiconductor memory device in which a high voltage MOS transistor and a fine memory cell can be arranged in the same chip, and an impurity semiconductor region junction required for each transistor can be realized. It is to provide a manufacturing method.
- Still another object of the present invention is to provide a technique for reducing the size of a select transistor of a memory cell.
- Still another object of the present invention is to provide a technique capable of suppressing halation of exposure light when patterning a control gate electrode of a memory cell.
- I-DM IEDM
- Technical Digest p61-p64
- semiconductor non-volatile using grooves formed in silicon substrate A technique for performing separation between conductive elements is described.
- a deposited silicon oxide film (referred to as "LP-CVD film" in the above-mentioned document) is used as a filling material to fill the trench between the elements.
- the semiconductor non-volatile 14 element includes a first gate electrode surrounded by an insulating film, and a second gate electrode located immediately above the first gate electrode.
- the second gate electrode must be formed by reflecting the step generated by the first gate electrode. That is, processing must be performed in consideration of the height difference between the upper part of the first gate electrode and the electrode. This step may cause short-circuiting of adjacent patterns due to poor resolution of photolithography when processing the second gate electrode, or poor dry etching. Reduction of this step as much as possible is being studied. It seems that the method described in the above-mentioned document can also achieve the planarization between the elements, but since the usual deposited oxide film is used for filling between the elements, the joint does not disappear. The joints are opened by washing or dry etching, and once reduced height differences appear again, causing dry etching failure.
- boron-phospho 'silicate' glass which has a very high concentration of boron and boron. And phosphorus.
- BPSG boron-phospho 'silicate' glass
- the dissolution rate of hydrofluoric acid used in a cleaning process essential for the manufacture of semiconductor devices is several times higher than that of a silicon oxide film containing no impurities.
- the BPSG used for filling and planarization between devices undergoes significant erosion due to cleaning, causing a large difference in elevation again.
- Still another object of the present invention is to provide a technique for eliminating the step by using a material having sufficient etching resistance to hydrofluoric acid and the like used in the cleaning step.
- a method for manufacturing a semiconductor device includes: (a) a step of depositing a first conductive film on a memory cell formation region and a peripheral circuit region of a semiconductor substrate; Forming a first conductive pattern by etching the first conductive film; and ( c ) polishing the insulating film deposited on the first conductive pattern and the first conductive film in the peripheral circuit formation region to form the first conductive pattern. (D) forming a first insulating film between the conductive patterns; (d) forming a second conductive pattern on the first insulating film and the first conductive pattern after the step (c); Buttering the first conductor pattern and the second conductor pattern to form a floating gate electrode of the memory cell.
- the surface position of the first insulating film below the second conductor pattern is configured to be higher than the surface position of the first conductor pattern.
- the method for manufacturing a semiconductor device of the present invention comprises: (a) etching a first conductive film deposited on a semiconductor substrate to form a first conductive pattern; and (b) forming a first conductive pattern. Polishing the insulating film deposited on the turn to form a first insulating film between the first conductive patterns; and (c) after the step (b), forming a first insulating film on the first insulating film and the first conductive pattern. Forming a second conductor pattern; and (d) forming a floating gate electrode of the memory cell by patterning the first conductor pattern and the second conductor pattern.
- the surface position of the first insulating film is configured to be higher than the surface position of the first conductor pattern.
- a second insulating film is deposited on the first conductive film, and the second insulating film and the first conductive film are etched to form a first conductive pattern.
- the step is formed by polishing the insulating film and then etching the insulating film to the second insulating film.
- a second insulating film is deposited on the first conductive film, and the second insulating film and the first conductive film are etched to form a first conductive pattern.
- the insulating film is polished up to the second insulating film. Note that the second insulating film in this case can function as a stopper layer during polishing.
- a step of forming a side wall spacer on the side wall of the first conductive pattern, and a step of forming a groove in a self-aligned manner with the side wall spacer by etching the substrate before the first insulating film forming step, a step of forming a side wall spacer on the side wall of the first conductive pattern, and a step of forming a groove in a self-aligned manner with the side wall spacer by etching the substrate. And a process.
- a semiconductor device of the present invention is a semiconductor device having a first MISFET constituting a memory cell, wherein the first MISFET is formed on a main surface of a semiconductor substrate via a gate insulating film.
- a control gate electrode formed through the film, and a pair of semiconductor regions formed on the semiconductor substrate and acting as source / drain regions, the first isolation region being adjacent to the first in the first direction.
- a semiconductor device of the present invention is a semiconductor device having a first MIS FET and a second MIS FET, wherein the first MIS FET forming a memory cell is a semiconductor device.
- the elements between the MISFETs are separated by the second isolation region, and the surface position of the insulating film formed in the first isolation region is substantially uniform between the first MISFETs arranged in an array.
- the insulating film is embedded between the side wall spacers formed on the side walls of the first floating gate electrode. A semiconductor region is formed below the side spacer.
- the first isolation region has an insulating film embedded in a groove of the semiconductor substrate formed in a self-alignment manner with a sidewall spacer formed on a side surface of the first floating gate electrode. It has an improved structure.
- one of a pair of semiconductor regions acting as a source / drain region of a second MISFET is electrically connected to a semiconductor region of the first MISFET, and is connected to a second isolation region.
- the first MISFET is separated from the second MISFET, and the first and second isolation regions are self-aligned with respect to the sidewall spacers formed on the side surfaces of the first floating gate electrode and the gate electrode of the second MISFET. It has a structure in which an insulating film is embedded in a groove of a semiconductor substrate formed in a consistent manner.
- the gate electrode of the second MISFET is made of at least a material constituting the first floating gate electrode, the second floating gate electrode, and the control gate electrode, and the second floating gate electrode and the control gate electrode Are electrically conductive.
- the second floating gate electrode and the control gate electrode may be connected via an opening formed in the interlayer insulating film.
- Semiconductor device having a first MI SFET and a second MI SFET The MISFET is formed by forming a first floating gate electrode formed on the main surface of the semiconductor substrate via a gate insulating film, and electrically connecting to the first floating gate electrode on the first floating gate electrode.
- the first MIS FET adjacent to the first MIS FET in the first direction by the first isolation region, and the second MIS FET includes a gate insulating film, a first floating gate electrode, and a second floating gate electrode.
- a semiconductor region acting as one of the first MISFET is electrically connected to one semiconductor region of the first MISFET, and is configured to extend below the first gate region.
- the channel region is formed in the substrate below the second gate region, and is formed between the semiconductor regions acting as the source and drain regions of the second MISFET.
- control gate electrode of the first MIS FET is formed integrally with a word line extending in the first direction
- one semiconductor region of the second MIS FET is One semiconductor region of the first MISFET provided adjacently in the second direction perpendicular to the first direction is formed integrally with one semiconductor region, and the other semiconductor region of the second MISFET is connected to the data line. It can be electrically connected.
- the semiconductor device of the present invention is a semiconductor device having a first MISFET constituting a memory cell, wherein the first MISFET is formed on a main surface of a semiconductor substrate via a gate insulating film.
- a channel region of the first MISFET is disposed between the pair of semiconductor regions in the substrate, and the pair of semiconductor regions of the first MISFET is formed in a symmetrical structure.
- Information is written and erased by injecting and emitting electrons between the first floating gate electrode and the first floating gate electrode by tunneling through a gate insulating film.
- electrons are transferred from the first and second floating gate electrodes to the substrate.
- the first voltage is applied to the control gate electrode and the semiconductor region of the first MISFET is connected to the semiconductor under the first floating gate electrode.
- the voltage is the same as that of the substrate and lower than the first voltage.
- the control gate electrode has a second polarity different from the first voltage.
- Voltage of the selected first MISFET is set to the same potential as the semiconductor substrate under the first floating gate electrode, and the channel region is inverted.
- a third voltage having the same polarity as the second voltage is applied to the semiconductor region, and the voltage between the channel region and the control gate electrode is changed to the selected first MISFET channel region and the control gate electrode. Is set to be lower than the potential between.
- control gate voltage applied as the second voltage has a plurality of voltage levels of three or more, and the first control gate voltage based on the difference in the amount of charge injected into the floating gate electrode corresponding to the voltage level
- the change in the threshold voltage of the MISFET can be logically correlated, so that two or more bits of information can be stored in one memory cell. Further, in this case, when writing information to the memory cell, writing can be performed by sequentially shifting from a writing operation at the highest second voltage to a writing operation at a lower second voltage.
- the amount of charge injected at a higher second voltage is determined in order from the detection of the threshold value corresponding to the amount of charge injected at the lowest second voltage. Can be read by shifting to the detection of the threshold value corresponding to.
- the channel region of the first MISFET can be arranged between the pair of semiconductor regions in a second direction perpendicular to the first direction. Further, the channel region of the first MISFET can be disposed between the pair of semiconductor regions in the first direction.
- the pair of semiconductor regions of the first MISFET can be configured to have a symmetric structure.
- the method of manufacturing a semiconductor device comprises the steps of: forming a semiconductor device formed in the semiconductor substrate so as to extend in the second direction; Become The first MIS FET that comprises a local data line and a local source line, a first MIS FET and a second MIS FET, and forms a memory cell is formed on the main surface of the semiconductor substrate via a gate insulating film.
- the second MISFET has a gate insulating film on the main surface of the semiconductor substrate.
- the first MI SFET is A method of manufacturing a semiconductor device in which a first MIS FET adjacent in one direction is element-isolated, and a second isolation region separates elements between the second MIS FETs.
- the second insulating film is removed to the first insulating film and planarized to form first and second isolation regions. Removing the edge film to expose the surface of the first conductive film; and (f) contacting the surface of the first conductive film.
- the method for manufacturing a semiconductor device of the present invention includes the steps of: electrically connecting a first floating gate electrode formed on a main surface of a semiconductor substrate via a gate insulating film to a first floating gate electrode on the first floating gate electrode; A second floating gate electrode formed by connecting to the second floating gate electrode; a control good electrode formed on the second floating gate electrode via an interlayer insulating film; and a source / drain region formed in the semiconductor substrate.
- a method for manufacturing a semiconductor device having a pair of semiconductor regions acting as a semiconductor device comprising: (a) a gate insulating film, a first conductive film A step of sequentially depositing a first insulating film and patterning the first insulating film and the first conductive film into a stripe-shaped column pattern; and (b) a step of forming a side wall spacer on a side wall portion of the column pattern.
- step (C) after the step (b), depositing a third insulating film on the semiconductor substrate; (d) removing the third insulating film up to the first insulating film and flattening; After removing the first insulating film to expose the surface of the first conductive film, a second conductive film is formed so as to be in contact with the surface of the first conductive film and to cover the first conductive film in the direction in which the column pattern extends. And (f) sequentially depositing an interlayer insulating film and a third conductive film on the second conductive film, and forming the third conductive film, the interlayer insulating film, the first and second conductive films in the direction in which the column pattern extends. And patterning in a direction perpendicular to the direction.
- the method for manufacturing a semiconductor device includes the steps of (a) sequentially depositing a gate insulating film, a first conductive film, and a first insulating film on a semiconductor substrate, and patterning the first insulating film into a stripe-shaped column pattern; (B) forming a groove in the semiconductor substrate by etching the first insulating film in a self-aligning manner after the (a) step; and (c) forming the groove in the semiconductor substrate. (C) removing the second insulating film up to the first insulating film and planarizing the second insulating film after the second insulating film is deposited, and (d) removing the first insulating film to expose the first conductive film surface.
- a step of patterning and has a.
- the first floating gate electrode is formed of a first conductive film
- the second floating gate electrode is formed of a second conductive film
- the control gate electrode is formed of a third conductive film.
- the surface position of the third insulating film below the second conductive film can be equal to or higher than the surface position of the first conductive film.
- the third insulating film can be planarized by polishing.
- the first insulating film can function as a stopper layer during polishing.
- the third insulating film can be removed up to the first insulating film.
- the patterning of the striped column pattern in the step (a) is performed on the memory cell forming region, and the other regions are performed so that the first conductive film and the first insulating film remain.
- a third MISFET is formed, and a semiconductor region serving as a source / drain region of the third MISFET is formed before the formation of the semiconductor region.
- the method further includes forming a first interlayer wiring, wherein the first layer wiring in the memory cell formation region is formed in a lattice shape, and an interlayer between the second layer wiring attached on the first layer wiring is provided.
- the insulating film is planarized by the CMP method.
- the method for manufacturing a semiconductor device includes: (a) a step of depositing a first conductive film on the first MISFET formation region and the second MISFET formation region of the semiconductor substrate; Forming a first conductive pattern by etching the first conductive film in the first MISFET forming region; and (c) forming a first conductive pattern and a second MISFET forming region on the first conductive film. Polishing the insulating film deposited on the first conductive pattern to form a first insulating film between the first conductive patterns; and (d) after the step (c), removing the first conductive film in the second MISFET formation region. Removing step.
- the manufacturing method may include, after the step (d), a step of forming a gate insulating film and a gate electrode in the second MISFET formation region.
- a step of forming a second conductor pattern on the first insulating film and the first conductor pattern is included, and the first conductor pattern and the second conductor pattern constitute a floating gate electrode of the memory cell.
- the surface position of the first insulating film below the second conductor pattern can be configured to be higher than the surface position of the first conductor pattern.
- the semiconductor device of the present invention is a semiconductor device having a first MISFET constituting a memory cell, wherein the first MISFET is provided on a main surface of a semiconductor substrate via a gate insulating film.
- a first floating gate electrode formed, a control gate electrode formed above the first floating gate electrode via an inter-layer insulating film, and a pair of A first MISFET adjacent to the first MISFET in the first direction is element-isolated by a first isolation region, and the first isolation region has a structure in which an insulating film is embedded in a groove of a semiconductor substrate.
- the upper surface of the insulating film is a semiconductor
- the channel region of the first MISFET which is higher than the main surface of the substrate, is disposed between the pair of semiconductor regions in a second direction perpendicular to the first direction.
- a second floating gate electrode is formed on the first floating gate electrode so as to be electrically connected to the first floating gate electrode, and an interlayer insulating layer is formed on the second floating gate electrode.
- a film is formed, the second floating gate electrode is configured to extend on the upper surface of the insulating film, and the upper surface of the insulating film can be higher than the upper surface of the first floating gate electrode.
- the groove may be formed in a self-aligned manner with respect to the side surface of the first floating gate electrode.
- the object of the present invention is achieved by the following operations.
- the conventional floating gate electrode and drain region By writing and erasing operations to and from the memory cell by injecting and discharging the entire surface of the electrons through the gate insulating film between the floating gate and the semiconductor substrate, the conventional floating gate electrode and drain region The overlapping portion with the above is unnecessary. For this reason, the area of the memory cell can be reduced, and high integration of the nonvolatile semiconductor memory device can be achieved.
- the memory cell in the data line direction can be divided into blocks by the selection transistor, and during writing, the selection transistor in the unselected block is turned off, and unnecessary memory cells in the unselected block are not required.
- the application of the data line voltage can be prevented. For this reason, unintended rewriting of unintended information into unselected memory cells (disturb phenomenon) can be prevented, and the reliability of the nonvolatile semiconductor memory device is improved.
- An OS transistor can be formed at a sufficiently high temperature to form a deep junction by forming an impurity semiconductor region at a sufficiently high temperature, so that a structure suitable for transistor operation at a high voltage can be obtained.
- a shallow junction can be formed to maintain high punchthrough resistance.
- Such a shallow-junction impurity semiconductor region of the memory cell does not receive excessive heat history thereafter, so that excessive impurity diffusion does not occur, and the shallow junction can maintain its structure as originally formed. it can.
- the processing accuracy of the second floating gate electrode and the word line is improved. That is, when the second floating gate electrode is puttered, the underlayer is flattened, and scattering of exposure light reflecting unevenness of the underlayer does not occur. Therefore, the exposure accuracy is improved, the processing accuracy of the nonvolatile semiconductor memory device is improved, and high integration can be facilitated.
- the present application discloses the following semiconductor device and a method for manufacturing the same.
- a fluid silicon oxide film containing phosphorus or boron is filled between electrodes on a semiconductor substrate of a plurality of semiconductor elements formed on the same semiconductor substrate, and the fluid oxide film is Has nitrogen introduced on its surface.
- the electrode can be a floating gate electrode of a semiconductor nonvolatile memory element.
- a flowable silicon oxide film containing phosphorus or boron is filled between electrodes made of polycrystalline silicon of a plurality of semiconductor elements formed on the same semiconductor substrate.
- the method includes a step of thermally treating the surface of the conductive oxide film in an ammonia atmosphere.
- the electrode can be a floating gate electrode of a semiconductor nonvolatile memory element.
- BPSG is heated in an ammonia atmosphere in order to improve liquid cleaning.
- BPSG is nitrided to a depth of about 100 nm from its surface.
- Figure 110 shows the effect of BPSG on the dissolution rate of hydrofluoric acid (diluted 1: 100 with water).
- the etching rate of BPSG treated at 850 ° C in a nitrogen atmosphere is about 45 nanometers per minute regardless of the processing time.
- the etching rate is reduced to about 5 nanometers per minute.
- the etching rate when nitriding an oxide film containing no impurities (deposited by chemical vapor deposition) is also described, but this value is almost the same as that when heat treatment was performed in a nitrogen atmosphere. .
- the etching rate of a nitrided BPSG film can be reduced to half that of a deposited oxide film without impurities.
- FIG. 11 shows the effect on the processing temperature when performing the heat treatment for 20 minutes in an ammonia atmosphere. It has been found that the etching rate can be reduced to about the same level as that of a deposited oxide film containing no impurities by the treatment at 750 ° C, and to a lower etching rate at 800 ° C or more.
- etching rate of BPSG nitrided at a temperature of more than 750 ° C for hydrofluoric acid diluted 1: 100 was lower than that of the deposited oxide film containing no impurities, that is, per minute. It can be reduced to about 5 nanometers. This value is sufficient to maintain a flat step between devices.
- Disturbance resistance of the memory cell can be improved by dividing the memory cell in the memory cell by the selection transistor.
- a shallow junction impurity semiconductor region structure can be achieved by using an information rewriting method by injecting and discharging charges over the entire surface of the channel, and as a result, cell operation in a fine region becomes possible. Further, deterioration of the gate oxide film caused by rewriting can be reduced.
- the impurity semiconductor region of the high-breakdown-voltage MOS transistor is formed with a fine gate structure.
- a flat device structure can be realized by embedding irregularities resulting from a difference in height between devices, and the etching resistance of the insulating film that has achieved the flattening can be improved. As a result, it is possible to suppress any processing defects due to the difference in height between the elements.
- FIG. 1 is a schematic configuration diagram showing the entire chip of the AND-type flash memory according to the first embodiment.
- FIG. 2 is a main circuit diagram of the AND-type flash memory according to the first embodiment.
- FIG. 4 is a conceptual diagram showing an example of a planar layout of the AND-type flash memory according to the first embodiment.
- FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3
- FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 3.
- FIGS. 7 to 19 show an example of a method of manufacturing the AND-type flash memory according to the first embodiment in the order of steps.
- FIG. 20 is a conceptual diagram showing an example of a planar layout of the AND type flash memory according to the second embodiment.
- FIGS. 21 is a sectional view taken along the line XXI—XXI in FIG. Is a sectional view taken along line XXII-XXII in FIG. 20, and FIG. 23 is a sectional view taken along line XXIII-XXIII in FIG.
- FIGS. 24 to 35 are sectional views showing an example of a method of manufacturing the AND type flash memory according to the second embodiment in the order of steps.
- FIGS. 36 to 42 show the AND type flash memory according to the third embodiment.
- FIG. 43 to FIG. 49 are cross-sectional views illustrating an example of the method of manufacturing the AND-type flash memory according to the fourth embodiment in the order of the steps.
- Fig. 51 is a conceptual diagram showing how the threshold value differs depending on the amount of injected electrons. Fig.
- FIG. 51 shows the state of the memory cell during data read, write, and erase operations performed in the fifth embodiment.
- FIG. 52 is a chart showing applied control voltages together with a conceptual diagram of a memory cell.
- FIG. 53 is a flowchart showing an example of a write sequence.
- FIG. 53 is a plan view showing a part of the structure of the memory cell and the select transistor of the AND-type flash memory according to the fifth embodiment.
- FIGS. 55 to 77 are cross-sectional views or plan views illustrating an example of a manufacturing process of the AND-type flash memory according to the fifth embodiment in the order of steps.
- FIG. 78 is a plan view showing an example of the AND-type flash memory according to the sixth embodiment with respect to the memory cell region, and FIG.
- FIGS. 79 is a cross-sectional view of the AND-type flash memory according to the seventh embodiment.
- FIGS. 80 and 81 are cross-sectional views showing an enlarged view of a portion D in FIG. 79.
- FIGS. 82 to 87 show an example of a method of manufacturing the AND-type flash memory according to the sixth embodiment.
- FIGS. 88 to 99 are cross-sectional views or plan views showing an example of a method of manufacturing the AND-type flash memory according to Embodiment 7 in the order of steps.
- FIGS. FIG. 105 is a cross-sectional view showing an example of the semiconductor device of Embodiment 8
- FIGS. 105 to 109 are cross-sectional views showing an example of the semiconductor device of Embodiment 9, and FIG.
- FIG. 110 is hydrogen fluoride of BPSG.
- This is a graph showing the effect of improving the dissolution rate for acid (diluted 1: 100 with water).
- Figure 11 shows the effect on the treatment temperature when heat treatment is performed for 20 minutes in an ammonia atmosphere.
- FIG. FIG. 11 to FIG. 120 are plan views or cross-sectional views of the NOR flash memory according to the tenth embodiment, or cross-sectional views or plan views showing an example of a manufacturing method thereof in the order of steps.
- FIGS. 122 and 122 are cross-sectional views of a NOR flash memory according to another embodiment. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a schematic configuration diagram showing the entire chip of the AND-type flash memory according to the first embodiment.
- FIG. 2 is a main part circuit diagram of the AND flash memory according to the first embodiment.
- the AND-type flash memory according to the present embodiment includes a memory array MEMARRAY, a latch circuit LATCH, and a column decoder XDEC.
- the memory array MEMARRAY has 4 k bits, or 512 bytes, of memory cells connected on at least one word line selected by the address input Ax, and addresses in the column direction (generally the number of word lines). There are 16K books.
- the latch circuit LATCH has a length of 4 kbits (512 bytes).
- control signal systems such as a chip select signal, write operation control signal, and erase operation control signal are input to the control circuit CNTRL (collectively displayed by CNTRL), and the address is input to the input buffer (shown in the figure).
- the row address Ay may be generated internally using a counter circuit in the control circuit CNTRL and sent to the row gate YDEC.
- the data is connected to the input / output circuit I / O and the sense system including the data latch system.
- the sense system SENSE AMP has a function of receiving a signal from the control circuit CNTRL, transferring data to a memory cell via a row gate YGATE, recognizing memory cell data, and transmitting data via an internal bus BUS. I have.
- the sense circuit includes a latch circuit LATCH and a sense amplifier control circuit YD-CNTRL.
- the memory cells in the row direction are selected by a row decoder YDEC.
- the sense circuit receives a signal from the control circuit CNTRL and has the function of transferring data to the memory cell via the row gate, recognizing the memory cell data, and transmitting the data via the internal bus BUS. ing.
- the memory chip CH IP also includes a bit line voltage control circuit DIS CHARGE for controlling the bit line voltage in the memory array MEMARRAY and an internal voltage generation circuit C PC for sending the voltage to each voltage control circuit. Is provided.
- memory cells M11 to M22 and N11 to N22 are arranged in a matrix, and the gate (gate electrode) of each memory cell is connected to word lines Wl1 to W22. .
- Drain of each memory cell The (drain region) is connected via data lines D11 to D22 to selection transistors SD11 to SD22 for selecting the same.
- the drains of the select transistors SD11 to SD22 are global data lines GD; ⁇ Connected to GD2.
- the source (source region) of each memory cell is connected to a common source line via source lines S11 to S22 and selected transistors SS11 to SS22.
- the gates of the select transistors SD11 to SD22 and SS11 to SS22 are connected to gate lines SiDl to SiD2 and SiSl to SiS2.
- the selection transistors form one block BL 1 or B 12 with a total of 64 or 128 memory cells in the data line direction.
- the memory array MEMAR RAY is composed of two blocks, but this is not a limitation.
- the column decoder XDEC is comprised of a source line voltage control circuit XDEC 1, XDEC 2 for applying a high voltage to the word lines Wl 1 to W 22, and control circuits SG DEC 1, SGDEC 2 of the selection transistors. Although described in another area, a source voltage control circuit S DEC to which a common source line is connected may be included.
- the column decoder includes a high voltage system voltage Vpp (Vww, Vwd, etc.), a low voltage system voltage Vcc (Vrw, Vec, etc.), a negative voltage system voltage Vnn ( -V ew) is supplied, and a column line selection signal is given by the column address Ax.
- the internal voltage generation circuit CPC uses the power supply voltage Vcc (for example, 3.3 V) supplied from outside the chip and the reference voltage (GND that is 0 V) to read, write, and erase data as described below. Generates the voltage (Vww etc.) used for operation.
- Vcc for example, 3.3 V
- GND reference voltage
- a charge extracting MOS transistor QD1 which has a function of extracting the electric charges of the bit lines (global data lines GD1, GD2) before the reading operation, is performed.
- QD 2 is provided. They also have a function of supplying a voltage from a voltage supply circuit for a non-selected bit line during writing to the bit line.
- the bit lines (global data lines GD1, GD2) are connected to the latch circuit LATCH via the row gate control circuit YD-CNTRL.
- Table 1 shows the read, write, and erase operations of the memory mat in Figure 2.
- Table 1 shows the case where memory cell Ml 1 is selected,
- Vww (for example, 17 V) is applied to the word line Wl 1 and a voltage of, for example, 10 V is applied to the gate S i D 1 of the selection transistor on the drain side.
- a voltage of 0 V is applied to the selected local bit line (data line Dl 1) via the selection transistor SD 11.
- a voltage of 0 V is applied to the unselected word line W12, and the unselected local bit line (data line D12) is applied from the bit line (global data line GD2) via the selection transistor SD12.
- Vwd (for example, 6 V) is applied.
- a voltage of 0 V is applied to the gate S i S 1 of the selection transistor on the source side to turn off the selection transistors S S 11 and S S 12.
- electrons can be injected into the floating gate by tunnel current through the entire channel region of the memory cell Ml1.
- electrons are not injected into the unselected memory cells Ml2, M21, and M22 because no high electric field is applied between the floating gate and the substrate.
- an inversion layer is formed over the entire channel region and the source and drain terminals are Since the same voltage is set for the terminals, it does not affect the breakdown voltage between the source and drain terminals.
- a voltage of —Vew (for example, —17 V) is applied to the selected word line Wl 1, and 3.3 V is applied to the selected transistor gates S i S 1 and S i D 1 to be connected thereto. All selected transistors are turned on. A voltage of 0 V is supplied to the local bit line and the local source line via the selection transistor. A voltage of 0 V is applied to the unselected word lines W12. As a result, all the memory cells connected to the selected word line W11 emit electrons.
- the voltage values shown above are absolute values with respect to the substrate or the cell potential.
- the disturb phenomenon caused by the bit line can be prevented by turning off all the select transistors SD21, 3022 and 3321 and SS22 of the unselected block.
- FIG. 3 is a conceptual diagram showing an example of a planar layout of the AND flash memory according to the first embodiment.
- the AND-type flash memory has memory cells M (Ml 1 to M22, N 1:! To N 22) arranged in rows and columns, and has a memory cell block BL (BL 1, BL 2). ) Is formed.
- a word line 301 (8) (word wiring Wl1 to W22) functioning as a control gate electrode of the memory cell M extends.
- a selection transistor SD (SD11, SD12)
- a selection transistor SS (SS11, SS12)
- the selection transistor SD and the selection transistor SS are separated from each other by the element isolation region 302 (19).
- Lysenore M is composed of ISFET (Meta Insulator-Semiconductor Field Effect Transistor).
- the source and drain regions of the memory cell M are a source region 303 (1 1), which is an n-type semiconductor region functioning as the source lines S11, S21, and an n-type semiconductor region functioning as the data lines Dl1, D21.
- a drain region 304 (10) and each They are commonly configured.
- the memory cells M adjacent in the row direction are separated by the element isolation region 305 (5).
- the global data line GD (GD1, GD2) made of metal wiring is electrically connected to the ⁇ -type semiconductor region 307, which is the drain region of the selection transistor SD, via the contact hole 306.
- the ⁇ -type semiconductor region 308 (21), which is the source region of the select transistor SD, is electrically connected to the drain region 304 (10).
- the metal wiring constituting the common source line is wired so as to intersect with the global data line GD (not shown), and via the contact hole 309, the ⁇ -type semiconductor region 310 which is the source region of the selection transistor SS.
- the ⁇ -type semiconductor region 311, which is the drain region of the selection transistor SS is electrically connected to the source region 303 (11) in the memory cell block.
- the gate electrodes 312 and 313 of the select transistors SD and SS are composed of the wiring material of the word line 301 (8) above the floating gate.
- the transistor area of the memory cell M is a floating gate electrode 314 (3, 7). This is the area shown.
- the floating gate electrode 314 (3, 7) is formed below the word line 301 (8) and consists of the first layer floating gate electrode 314a (3) and the second layer floating gate electrode 314b (7). It has a two-layer structure.
- the first-layer floating gate electrode 314a (3) is formed on the main surface of the semiconductor substrate 1 with the tunnel oxide film 2 serving as a gate insulating film interposed therebetween, and has a memory cell source region 303 (1 1). And a channel region between the drain region 304 (10).
- the second-layer floating gate electrode 3 14 b (7) is disposed above the first-layer floating gate electrode 314 a (3), and the lead line 301 (8) and the floating gate electrode 3 14 (3, 7) The capacitance value is determined.
- the control gate electrode 8 is formed on the second-layer floating gate electrode 314 b (7) with the interlayer insulating film 15 interposed, and the control gate electrode 8 is formed integrally with the word line 301 (8). . That is, the channel region is arranged between the source region 303 (11) and the drain region 304 (10) in the row direction.
- FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3
- FIG. 5 is a cross-sectional view taken along line VV in FIG.
- FIG. 6 is a sectional view taken along line VI-VI in FIG.
- Each memory cell has a structure in which a shallow trench isolation (SGI) and a p-type channel stop region 16 are provided, and a deposited oxide film 5 is formed in a trench of a silicon substrate.
- SGI shallow trench isolation
- a p-type channel stop region 16 are provided, and a deposited oxide film 5 is formed in a trench of a silicon substrate.
- the surface of the P-type silicon substrate 1 is covered with a tunnel oxide film 2 as a gate insulating film having a thickness of about 9.5 nm, and a first floating gate electrode 3 formed on the tunnel oxide film 2 by a polycrystalline silicon layer. (314a) is formed.
- the side surface of the first floating gate electrode 3 is covered with an insulating film 4 which is a side wall spacer, and a second floating gate electrode 7 (314b) made of polycrystalline silicon is formed thereon. I have.
- the second floating gate electrode 7 and the first floating gate electrode 3 are electrically connected.
- an interlayer insulating film 15 is formed on the second floating gate electrode 7 and the element isolation region 5.
- a control gate electrode 8 (301) made of a silicide layer of polycrystalline silicon or tungsten and the like and an insulating film 17 are formed on the interlayer insulating film 15.
- an insulating film 128 is formed on the control gate electrode 8, and a data line (a gate and a balde line) disposed on the insulating film 128 so as to be orthogonal to the control gate electrode 8.
- the metal wiring to be the data line GD) is formed.
- the source region 11 (303) and the drain region 10 (304) of the memory cell are formed in the silicon substrate immediately below the first-layer floating gate electrode 3.
- the semiconductor regions (source region 11 and drain region 10) of the memory cell are electrically connected to the semiconductor regions 308 (21) and 311 of the select transistor (SD, SS) (FIG. 5). As will be described later, the source region 11 (303) and the drain region 10 (304) have a symmetric structure and a shallow junction.
- the memory cell M and the MIS FETs other than the select transistors SD and SS constitute a peripheral circuit and are formed in the peripheral circuit formation area (peripheral circuit section).
- the MIS FET to which the voltage Vpp of the high voltage system is applied B is formed by a high voltage MIS FET.
- Circuits including the high breakdown voltage MISFET include, for example, an internal voltage generation circuit CPC and a column decoder XDEC.
- the gate electrodes (312, 313) of the select transistors are the control gates of the memory cells. Eight electrodes are used.
- the element isolation 19 is formed in an element isolation step of a peripheral circuit portion described later (FIG. 4).
- the gate oxide film 9 of the select transistor has a thickness greater than that of the good insulating film 2, and the thickness is, for example, about 25 nm.
- the word lines (301, 8) are formed at equal intervals with the minimum processing dimensions, and the first and second floating gate electrodes 3, 7 and the interlayer insulating film 15
- the control gate electrode 8 serving as a lead line has a laminated structure.
- the lead lines are separated by a P-type semiconductor region 23 introduced by ion implantation.
- a buffer gate (remaining gate) 315 is formed between the select transistor and the gate line.
- the floating gate electrode 7 of the remaining gate 3 15 and the control gate electrode 8 are internally connected and are electrically connected.
- FIGS. 7 to 19 are cross-sectional views illustrating an example of the method of manufacturing the AND-type flash memory according to the first embodiment in the order of steps. 7 to 19, the left area indicates a peripheral circuit forming area (peripheral circuit section) in which transistors of the peripheral circuit are formed, and the right area indicates a memory forming area (memory cell section) in which a memory cell is formed. ).
- a photoresist is patterned so as to be an element isolation region of a peripheral circuit portion. Then, using this as a mask, the silicon nitride film 104 is removed by dry etching. Then, after removing the silicon oxide film 103, dry etching is performed using the silicon nitride film 104 as a mask so that a groove having a depth of about 0.35 / xm is formed in the semiconductor substrate 1. And etching. Next, the semiconductor substrate 1 is oxidized, and a silicon oxide film 101 having a thickness of about 30 nm is formed inside the etched groove.
- an insulating film (silicon oxide film) 102 is deposited (deposited) by about 0.5 ⁇ by the CVD method. Further, the surface of the insulating film 102 is shaved by CMP (Chemical Mechanical Polishing) to planarize the surface of the silicon nitride film 104 (FIG. 7).
- the silicon nitride film 104 is removed by hot etching with hot phosphoric acid or the like. Then, an element isolation region 302 (19) made of the insulating film 102 is formed. At this time, the element isolation region of the selection transistor in the memory mat is also formed at the same time.
- boron (B) is ion-implanted into the semiconductor substrate 1 in several implantation steps. In each implantation step, the energy and dose are adjusted. As a result, a P-type well region 105, a channel stopper region 107, and a channel region 108 are formed.
- the surface of the semiconductor substrate 1 is thermally oxidized to form a 9.5 nm silicon oxide film 110 (FIG. 8).
- the silicon oxide film 110 becomes the tunnel oxide film 2.
- a first polycrystalline silicon film (conductive film) 111, an insulating film (silicon oxide film) 112, and a silicon nitride film (SiN) 113 serving as an insulating film are formed by, for example, a CVD method.
- the layers are sequentially deposited (deposited) to form a laminated film 114.
- a phosphorus-doped polycrystalline silicon film doped with an impurity phosphorus (P) of about 1 ⁇ 10 2 t atoms m 3 or a non-doped polycrystalline silicon film can be used.
- the photo-etching process is performed so that the polycrystalline silicon film 111 becomes the first floating gate electrode (3, 314a) in the memory cell portion, and protects the surface of the semiconductor substrate 1 in the peripheral circuit portion.
- the polycrystalline silicon film 111, the insulating film 112, and the silicon nitride film 113 are processed by dry etching.
- the laminated film 114 in the memory cell portion is patterned into a line-shaped pattern (stripe-shaped column pattern (column line)) extending in the column direction.
- the polycrystalline silicon film 111, the insulating film 112, and the silicon nitride film are formed so as to protect the surface of the semiconductor substrate 1 even in the region where the select transistor is formed. 1 13 are left. Thereby, a concave portion is formed between the column patterns in the row direction.
- the photoresist is patterned so that the region where the memory cell is to be formed is opened, and arsenic (As) ions, for example, a dose of 5 ⁇ 10 15 atoms / cm 2 , a caro speed voltage of 5 OKe V Ions are implanted into the substrate under the conditions described above to form semiconductor regions (diffusion layers) 10, 11, 11, 15, 303, and 304 that function as the source and drain regions of the memory cell.
- the laminated film 114 in a column pattern functions as a mask in addition to the photoresist.
- the n-type semiconductor region 115 can be formed in a self-aligned manner with respect to the column pattern, and can be accurately formed even with a fine column pattern.
- the semiconductor region 1 15 can be formed. That is, the source regions 11, 115, and 303 and the drain regions 10, 115, and 304 are formed at the same time, that is, in the same ion implantation step, and thus have a symmetric structure. That is, the source regions 11, 115, and 303 and the drain regions 10, 115, and 304 are configured to have the same impurity profile.
- the silicon nitride film 113 is formed on the layered film 114 serving as a mask, impurities to be implanted stop at the silicon nitride film 113 and the polycrystalline silicon film 111 and the underlying layer The characteristics of the semiconductor substrate 1 are not affected.
- the semiconductor region 115 becomes a source region 303 (11) and a drain region 304 (10) functioning as a source line or a data line, as described later.
- a silicon oxide film which is an insulating film, is deposited by a CVD method having a thickness of 200 nm, and the silicon oxide film is anisotropically etched to form a side wall gap on the side surface of the laminated film 114.
- Form 6 Figure 9
- the semiconductor substrate 1 in a region where the laminated film 114 and the sidewall spacers 116 in the memory cell portion are not formed is cut by anisotropic dry etching, and a depth force S of about 0.35 / zm
- the grooves 1 17 are formed (FIG. 10).
- the groove 117 is formed.
- the side wall spacers 116 can be processed in a self-aligned manner.
- a channel stopper region 16 can be formed by ion-implanting an impurity into the bottom of the groove 117.
- the inside of the groove 117 is oxidized to form a silicon oxide film 118 of about 4 nm, and thereafter, a silicon oxide film (about 400 nm thick) formed by CVD using a CVD method.
- a silicon oxide film is deposited (deposited) (Fig. 11).
- the insulating film 119 is polished by the CMP technique, and flattening is performed up to the silicon nitride film 113 on the laminated film 114 (FIG. 12).
- the insulating film 119 is buried between the side walls 116 and the surface position is the column pattern. It is formed almost uniformly on the memory cell area and on the element isolation region. In this way, a shallow trench element isolation region composed of the deposited oxide film 5 can be formed.
- the silicon nitride film 113 functions as a CMP stopper, and the planarization process margin can be increased.
- the peripheral circuit portion and the like are covered with the laminated film 114, the surface of the semiconductor substrate 1 in that portion is not damaged and contaminated by the CMP process, and the formation of a recess having a large area is prevented. As a result, dishing that hinders planarization can be prevented.
- a second polycrystalline silicon film 120 is deposited (deposited) by a CVD method or the like, and processed (patterned) so as to become the second floating gate electrode 7 by a photoetching step. At this time, the peripheral circuits are protected. After that, an interlayer insulating film 121 is formed (FIG. 14).
- the second polycrystalline silicon film 120 is doped with, for example, phosphorus (P) as an impurity.
- the interlayer insulating film 121, the second polycrystalline silicon film 120, and the polycrystalline silicon film 111 of the peripheral circuit portion and the select transistor portion are removed by a photoetching process (FIG. 15).
- the surface position of the insulating film 119 is configured to be higher than the surface position of the first polycrystalline silicon film 111 serving as the first floating gate electrode 3.
- the second polycrystalline silicon film 120 serving as the floating gate electrode 7 is formed to extend on the insulating film 119.
- the capacitance between the second floating gate electrode 7 and the source / drain region (semiconductor region 115) can be reduced, and the characteristics of the memory cell M can be improved. That is, the surface position of the insulating film 1 19 below the second polycrystalline silicon film 120 to be the second floating gate electrode 7 is the first polycrystalline silicon film to be the first floating gate electrode 3. It is configured to be higher than the surface position of the insulating film.
- the surface position of the insulating film 119 is uniformly formed between the first polycrystalline silicon films 111 serving as the first floating gate electrodes 3. The surface position of the insulating film 119 is configured to be higher than the surface position of the insulating film 102.
- the silicon oxide film 110 was removed to expose the main surface of the semiconductor substrate 1. Thereafter, the exposed surface of the semiconductor substrate 1 is oxidized to form a silicon oxide film 109 having a thickness larger than that of the gate insulating film 2 and having a thickness of about 25 nm.
- Third polycrystalline silicon film 1 22 and WS i 2 film 123 is to be the control gate electrode 301 (8).
- the silicon oxide film 124 (17) is processed by a photoetching process so as to become a pattern of the gate electrode of the transistor in the peripheral circuit portion, the gate electrode of the select transistor, and the pattern of the control gate electrode of the memory cell. .
- the WSi 2 film 123 and the third polycrystalline silicon film 122 are processed using the silicon oxide film 124 (17) as a mask.
- the control gate electrode 301 (8) and the word line are formed which are patterned in the direction perpendicular to the extending direction of the column pattern and extend in the row direction.
- the interlayer insulating film 121, the second and first polycrystalline silicon films 120, 111 are sequentially processed.
- the patterned WSi 2 film 123 and the third polycrystalline silicon film 122 function as the gate electrode of the MS transistor in the peripheral circuit. Also, the patterned interlayer insulating film 121, the second and first polycrystalline silicon films 120, 111 are respectively formed by the interlayer insulating film 15 and the second floating gate electrode 7 constituting the memory cell M. And the first floating gate electrode.
- the photoresist is patterned so that the MOS transistors in the peripheral circuit are opened.
- phosphorus (P) ions are applied to the substrate under the conditions of a dose of 2 ⁇ 10 13 atoms / cm 2 and a caro-speed voltage of 100 keV.
- N-type low-concentration semiconductor region 125 of the high-breakdown-voltage MOS transistor in the peripheral circuit section by thermal diffusion at 850 ° C. You.
- the photoresist is patterned to form low-concentration N-type semiconductor regions for MOS transistors and select transistors in the peripheral circuit (Fig. 17).
- a silicon oxide film which is an insulating film with a thickness of about 200 nm, is formed by, eg, CVD, and a side wall capacitor is formed on the side surface of the gate electrode of the MOS transistor in the peripheral circuit by anisotropic etching.
- the photoresist is patterned so that the peripheral circuit portion and the selection transistor portion are opened.
- arsenic (As) ions are irradiated under the conditions of a dose of 5 ⁇ 10 15 atoms m 2 and an acceleration voltage of 50 keV. Ions are implanted into the substrate to form an N-type high concentration semiconductor region 127 (FIG. 18).
- a silicon oxide film and an interlayer insulating film 128 made of phosphor glass are formed by a CVD method, a plug electrode 129 is formed in a contact hole, and a metal wiring 130 is formed.
- the MOS transistor constituting the memory cell having the fine gate and the MOS transistor in the peripheral circuit section are formed on the same substrate.
- the shallow trench isolation is applied to the memory cell and the selection transistor, and the rewrite method using the entire channel is employed.
- the semiconductor regions 10, 11, 11, 15, 303, and 304 of the memory cell can be formed to have shallow junctions and have a symmetrical structure, so that memory cells can be miniaturized.
- the adoption of the rewriting method using the entire surface channel can reduce the deterioration of the silicon oxide film due to the rewriting stress. Further, by dividing the memory block by the selection transistor, disturbance in an unselected block at the time of rewriting can be reduced.
- the gate electrode of the selection transistor is formed of the material of the control gate electrode.
- the selection transistor is formed of the material of the floating gate electrode and the control gate electrode.
- An example in which the gate electrode can be formed will be described.
- the element isolation region of the selection transistor can be formed at the same time as the element isolation region of the memory cell portion.
- FIG. 20 is a conceptual diagram showing an example of a planar layout of the AND type flash memory according to the second embodiment.
- FIG. 21 is a sectional view taken along line XXI--XXI in FIG. 20
- FIG. 22 is a sectional view taken along line XXII-XXII in FIG. 20
- FIG. 23 is a sectional view taken along line XXIII-XXIII in FIG. is there.
- the buffer gate 315 is not formed in the AND type flash memory of the present embodiment. This is based on the fact that the gate electrode of the select transistor is composed of the materials of the floating gate electrode and the control good electrode, as described later.
- the gate electrodes of the select transistors SD and SS use the materials of the first and second floating gate electrodes 3 and 7 and the control gate electrode 8.
- the element isolation 5 has the same structure as the memory section.
- the lead lines are formed at equal intervals with the minimum processing dimensions, and the first and second floating gate electrodes 3, 7 and the interlayer insulating film 15 are formed.
- the control good electrode 8 serving as a word line has a laminated structure. The word lines are separated by a P-type semiconductor region 23 introduced by ion implantation.
- the internal interlayer insulating film 15 is partially removed, and conduction between the floating gate electrode 7 and the control gate electrode 8 is established.
- the thickness of the gate oxide film 9 of the selected transistor is about 25 nm.
- the cross section shown in FIG. 22 is the same as that of the first embodiment, and a description thereof will be omitted.
- 24 to 35 are cross-sectional views illustrating an example of a method of manufacturing the AND-type flash memory according to the second embodiment in the order of steps.
- the left area indicates the peripheral circuit section and the right area indicates the memory cell section, as in the first embodiment.
- the manufacturing method of the present embodiment is the same as that of the first embodiment before the formation of silicon oxide film 110 in FIG. Therefore, the description is omitted.
- the element isolation region formed up to this step is formed only in the peripheral circuit portion, and is not formed in the region where the selection transistor is formed.
- the surface of the semiconductor substrate 1 is oxidized to form a thermal oxide film 109 of about 20 nm. .
- the thermal oxide film 109 in the memory cell portion is removed by photoetching technology, and the exposed surface of the substrate is oxidized to form a 9.5 nm silicon oxide film 110.
- the thickness of the peripheral MOS transistor and the thermal oxide film 109 of the selection transistor portion inside the memory mat are 25 nm.
- the silicon oxide film 110 becomes the tunnel oxide film 2
- the thermal oxide film 109 becomes the gate insulating film of the transistors in the peripheral circuit and the select transistor.
- a first polycrystalline silicon film 111, a silicon oxide film 112 formed by a CVD method, and a silicon nitride film 113 are sequentially deposited (deposited) to form a laminated film 114. I do. After that, by the photo-etching process, the polycrystalline silicon film 111 is formed so that the laminated film 114 becomes the first floating gate electrode in the memory cell and the gate electrode of the MOS transistor in the peripheral circuit portion. Process by dry etching.
- the photoresist is patterned so that the MOS transistor in the peripheral circuit section is opened.
- phosphorus ( ⁇ ) ions are applied at a dose of 2 ⁇ 10 13 atoms m 2 and an acceleration voltage of 100 keV.
- ions are implanted into the substrate, and the N-type low-concentration semiconductor region 125 of the high-breakdown-voltage MOS transistor in the peripheral circuit is formed by thermal diffusion at 900 ° C.
- the photoresist is patterned to form an N-type low concentration semiconductor region of the selected transistor.
- the photoresist is patterned so that the memory cell portion is opened, and arsenic (A s) ions, for example, are implanted into the substrate under the conditions of a dose of 5 ⁇ 10 15 atoms / cm 2 and an acceleration voltage of 50 keV.
- the semiconductor region 1 15 of the memory cell is formed by ion implantation (FIG. 25).
- a silicon oxide film which is a 200-nm-thick insulating film, is formed by a CVD method.
- One spacer forms 1 16.
- arsenic (A s) ions to a dose of 5 X 1 0 1 5 atoms / cm 2 accelerating voltage 5 0 ke V
- Ion implantation is performed to form an N-type high-concentration semiconductor region 127 of the peripheral circuit and the selected MOS transistor (FIG. 26).
- the substrate area between the gate electrodes is The groove is cut by anisotropic dry etching, and a groove 117 having a depth of about 0.35111 is formed in a self-aligned manner with the side wall spacer 116 (FIG. 27).
- the inside of the groove 117 is oxidized to form a silicon oxide film 118 of about 4 nm, and thereafter, a silicon oxide film 119 serving as an insulating film having a thickness of 400 nm is covered by a CVD method. It is deposited (deposited) (Fig. 28).
- the formation of the groove 117 and the formation of the silicon oxide film 118 and the silicon oxide film 119 are the same as those in the first embodiment except that the groove 117 is also formed in the select transistor portion. is there.
- the silicon oxide film 119 is removed by the CMP technique, and the silicon nitride film 113 on the gate electrode 111 is flattened, and the silicon nitride film 113 is flattened.
- a silicon oxide film 119 is buried in the substrate (FIG. 29).
- the photoresist is patterned by a photo-etching process so as to open the memory cell portion, and the silicon oxide film 112 is removed by dry etching (FIG. 30). ).
- the silicon oxide film 112 in the peripheral circuit portion can be left, and a second polycrystalline silicon film 120 described later is removed.
- the polycrystalline silicon film 111 in the peripheral circuit portion can be protected.
- a second polycrystalline silicon film 120 is deposited (deposited), and processed so as to become the second floating gate electrode 7 by a photoetching process (FIG. 31).
- cover the peripheral circuits After that, after forming the interlayer insulating film 121, a part of the interlayer insulating film 121 of the select transistor is removed by a photoetching step (not shown) (FIG. 32). By thus removing a part of the interlayer insulating film 121 of the select transistor, the control gate electrode 8 and the second floating gate electrode 7 described later can be electrically connected.
- the substrate is exposed to, for example, phosphorus (P) ions at a dose of 2 ⁇ 10 13 atoms / cm 2 s at an acceleration voltage of 50 keV.
- Ion implantation is performed to form an N-type low-concentration semiconductor region 21 of the select transistor.
- B boron
- a side wall spacer 20 is formed on the side surface of the gate electrode by forming a silicon oxide film formed by the CVD method and anisotropic dry etching.
- the photoresist is then patterned, and arsenic (As) ions are implanted into the substrate under the conditions of a dose of 1 ⁇ 10 15 atoms / cm 2 and an accelerating voltage of 50 keV, and the N-type height of the select transistor is increased.
- a concentration semiconductor region 22 is formed.
- an interlayer insulating film 128 made of a silicon oxide film and a phosphor glass is formed by a CVD method, a plug electrode 122 is formed in a contact hole, and a metal wiring 130 is formed.
- a MOS transistor in the peripheral circuit section and a fine gate MOS transistor are formed on the same substrate.
- the channel width is defined by processing the lower polycrystalline silicon 3, and by processing the multilayer film 8 composed of the upper insulating film 17 and WS i 2 Z polycrystalline silicon film, Is defined.
- the memory impurity semiconductor region is formed. Unnecessary growth of the impurity semiconductor region for the memory cell having the fine gate can be prevented, and the operation in the fine gate region can be stabilized.
- the selection transistor is made of the material of the floating gate electrode and the control gate electrode of the memory, the region for forming the gate shown in the first embodiment becomes unnecessary, and the area can be reduced.
- FIG. 42 is a cross-sectional view showing one example of the method of manufacturing the AND-type flash memory according to the third embodiment in the order of steps.
- the left region indicates the peripheral circuit portion
- the right region indicates the memory cell portion, as in the first embodiment.
- the gate electrode of the MOS transistor in the peripheral circuit portion is formed only of the first polysilicon film.
- the second polysilicon film, The polycrystalline silicon film and WS i 2 film of No. 3 can be added as electrode wiring.
- the polycrystalline silicon film 111 and the silicon nitride film 113 are deposited (deposited).
- a polycrystalline silicon film 111 and an upper silicon nitride film are formed by a photo-etching process so that they become the first floating gate electrode 3 in the memory cell part and the gate electrode of the MOS transistor in the peripheral circuit part.
- Process 1 1 3 Thereafter, similarly to the second embodiment, a low-concentration semiconductor region 125 of the peripheral circuit, a semiconductor region 115 of the memory cell portion, and a side wall spacer 116 are formed. Further, similarly to the second embodiment, the high-concentration semiconductor regions 127 of the peripheral circuit portion are sequentially formed.
- the memory cell portion is subjected to substrate etching in a self-aligned manner with the sidewall spacers 116 to form trenches 117.
- a silicon oxide film 118 is formed, and a silicon oxide film 119, which is an insulating film having a thickness of 400 nm, is deposited (deposited) by a CVD method.
- the oxide film 1 19 is shaved and the silicon nitride film 1 13 on the gate electrode 1 11 is flattened, and the silicon oxide film 1 19 is buried between the side wall spacers 1 16.
- a second polycrystalline silicon film 120 is deposited (deposited) as shown in FIG.
- the floating gate electrode 7 is processed. At this time, cover the peripheral circuit section.
- an interlayer insulating film 121 is deposited (deposited), and a partial opening is formed in the transistor in the peripheral circuit portion and the interlayer insulating film 121 on the gate electrode of the select transistor (FIG. 39). For example, photo-etching technology is used to form the openings. Can be.
- a third polycrystalline silicon film 122, a WS i 2 film 123, and a silicon oxide film 124 are sequentially formed by a CVD method (FIG. 40).
- a silicon oxide film 124 is processed by a photoetching process so as to be a control gate electrode of the memory, and to be a gate electrode in the select transistor portion and the peripheral circuit portion.
- a force is applied so as to cover the gate electrode 111 of the peripheral circuit portion.
- WS i 2 film 1 2 3 third polycrystalline silicon 1 2 2, interlayer insulating film 1 2 1, second and first polycrystalline silicon films 1 2 0 using patterned silicon oxide film 1 2 4 as a mask , 1 1 1 are sequentially processed.
- the MOS As described above, in the present embodiment, the MOS
- FIGS. 43 to 49 are cross-sectional views showing an example of the method of manufacturing the AND flash memory according to the fourth embodiment in the order of steps.
- the left region indicates the peripheral circuit portion
- the right region indicates the memory cell portion, as in the first embodiment.
- the gate electrode of the selection transistor in the memory cell and the memory mat is offset from the shallow trench isolation.1
- the gate electrode of the peripheral circuit is in contact with the isolation region. It was a structure.
- a structure in which the gate electrode of the peripheral circuit is offset with respect to the element isolation region is used.
- a 9.5 nm silicon oxide film 110 is formed by oxidation.
- the oxide film thickness of the peripheral circuit is 25 nm.
- a first polycrystalline silicon film 150 and a silicon nitride film 151 are sequentially deposited (deposited) on the surface of the silicon oxide film.
- patterning is performed so as to be the first floating gate electrode in the memory cell portion, and to remove the electrode material in the region for element isolation in the peripheral circuit portion.
- the photoresist is patterned so that the memory cell portion is opened. For example, As ions are implanted into the substrate under the conditions of a dose of 5 ⁇ 10 15 atoms / cm 2 N and an acceleration voltage of 50 keV. Implantation is performed to form a semiconductor region 115 of the memory cell.
- a silicon nitride film having a thickness of about 6 nm and a silicon oxide film having a thickness of 200 nm are formed by a CVD method, and a side wall spacer is formed on a side surface of the gate electrode by anisotropic etching.
- a silicon nitride film having a thickness of about 6 nm is formed on the side wall of the gate electrode, an increase in the thickness of the gate insulating film at the end of the gate electrode can be prevented. As a result, processing with a fine gate length becomes possible, and high integration can be realized.
- the semiconductor substrate 1 not covered with the polycrystalline silicon film 150, the silicon nitride film 151, and the sidewall spacers 152 is anisotropically dry-etched.
- a groove with a depth of about 0.35 im is formed in a self-aligned manner with the side wall spacer 152, and then oxidized to form a silicon oxide film 153 of about 20 nm in the groove.
- a silicon oxide film 154 which is an insulating film, is deposited (deposited) by the CVD method, and then the silicon oxide film is removed by the CMP technique, and the silicon nitride film 1515 over the gate electrode is planarized.
- an isolation region composed of the silicon oxide film 154 can be formed. Unlike the first to third embodiments described above, the isolation region formed here is also formed in the peripheral circuit region at the same time.
- a second polycrystalline silicon oxide film 120 is deposited (deposited) on the entire surface by, for example, a CVD method. Then, the memory cell portion is processed to be the second floating gate electrode 7 by a photoetching process, and the peripheral circuit portion is covered. Thereafter, an interlayer insulating film 121 composed of a silicon oxide film, a silicon nitride film, a silicon oxide film, and a silicon nitride film is deposited (deposited). Next, a portion of the interlayer insulating film 121 which is to be a gate electrode of a transistor in a peripheral circuit and a select transistor (not shown) is partially removed by a photoetching process.
- a third polycrystalline silicon film 122, a WSi 2 film 123, and a silicon oxide film 124 formed by the CVD method are formed on the interlayer insulating film 121. Form sequentially.
- the silicon oxide film 124 is patterned by a photoetching process so that it becomes a control gate electrode in the memory cell portion and a gate electrode in the peripheral circuit portion.
- WS i 2 film 1 2 3 As a mask, WS i 2 film 1 2 3, third polycrystalline silicon film 1 2 2, interlayer insulating film 1 2 1, first and second polycrystalline silicon films 1 1 1 , 120 are sequentially removed by etching.
- the gate electrode thus formed becomes a floating gate electrode and a control gate electrode in the memory cell portion, and becomes a gate electrode in the peripheral circuit portion and the selection transistor portion.
- the gate electrodes of the transistors in the peripheral circuit portion and the select transistor are electrically connected to the third polysilicon film 122 and the second polysilicon film 120 at a portion opened in the interlayer insulating film 122. It is connected to the.
- the photoresist is patterned so that the MOS transistor portion of the peripheral circuit portion is opened, and for example, phosphorus (P) ions are dosed at 2 ⁇ 10 13 atoms / cm 2. Then, ions are implanted into the substrate under the condition of an acceleration voltage of 100 keV, and an N-type low-concentration semiconductor region 125 of a peripheral high-withstand-voltage MOS transistor is formed by thermal diffusion at 850 ° C. Subsequently, the photoresist is patterned to form a low-breakdown-voltage N-type low-concentration semiconductor region including a selection transistor.
- P phosphorus
- a silicon oxide film as an insulating film is deposited (deposited) by the CVD method, and a sidewall spacer 116 is formed on the side surface of the gate by anisotropic dry etching.
- the photoresist is patterned so as to open the peripheral circuit, and, for example, As ions are implanted into the substrate under the conditions of a dose of 5 ⁇ 10 15 atoms / cm 2 and an acceleration voltage of 50 keV.
- An N-type high-concentration semiconductor region 127 of the M ⁇ S transistor portion and the selection transistor is formed.
- a silicon oxide film and an interlayer insulating film 128 of phosphor glass are formed by a CVD method, a plug electrode (not shown) in a contact hole is formed, and a metal wiring 130 is formed.
- a structure in which the gate electrodes of all the transistors are offset from the element isolation regions can be obtained.
- the impurity semiconductor region of the peripheral circuit portion is formed.
- the structure in which the element isolation of the memory cell is formed in a self-aligned manner after processing the floating good electrode of the memory cell has been described.
- the memory differs from the above embodiments in that an element isolation region is formed before forming a gate electrode of a memory cell.
- Embodiments 1 to 4 the method of storing binary (1 bit) information in the memory is used, whereas in Embodiment 5, four values (1 bit) are stored in one memory cell.
- a circuit system of so-called multi-valued logic storage for storing 2 bits of information is employed.
- the planar structure of the AND flash memory of the present embodiment, that is, the AND flash memory of the multi-valued logic storage system will be described with reference to FIG.
- the AND-type flash memory of the present embodiment includes a memory array MEMARRAY, a latch circuit LATCH, and a column decoder XDEC.
- the memory array MEMARRAY has memory cells arranged in a matrix consisting of rows and columns. A plurality of word lines extend in the row direction of the memory cell, and a plurality of data lines extend in the column direction. At least one bridge is connected to 8 k memory cells.
- the AND-type flash memory according to the present embodiment has a storage capacity of 2 bits per memory cell, and thus has a storage capacity of 2 k bytes per 8 k memory cells. At least one word line is selected by address input AX. 16 k memory cells are connected to the address in the column direction, that is, at least one data line.
- the latch circuit LATCH has a length of 8 k (2 k bytes).
- the signals input from the outside to the control circuit CNTRL, the address signals input to the column decoder XDEC and the row gate YGATE, and the like are the same as in the first embodiment.
- the data input / output circuit and the memory cell selection circuit in the row direction are the same as in the first embodiment.
- the bit line voltage control circuit DIS CHARGE and the internal voltage generation circuit CPC are the same as in the first embodiment. Therefore, their description is omitted.
- the circuit configuration of the AND-type flash memory cell of this embodiment is the same as that of FIG. 2 of the first embodiment, and the connection of each member is the same as that of the first embodiment. Therefore, the description is omitted.
- the setting of the threshold after writing and erasing is changed from the conventional AND type.
- Information is recorded by the presence or absence of electrons injected from the semiconductor substrate through the tunnel oxide film, as in the past.However, in the method of writing information by emitting electrons, the threshold voltage of the transistor after the emission is reduced. The variability is large, which is not appropriate for a multi-level method with a narrow threshold window. Therefore, the AND type flash memory according to the present embodiment employs a method of writing information by electron injection from the substrate, and has a uniform threshold value so as to be suitable for a multivalued method with a narrow threshold window. Therefore, when information is written, that is, when electrons are injected into the floating gate electrode, the threshold voltage of the subsequent transistor increases, while when information is erased, that is, when electrons are emitted. The threshold voltage thereafter decreases.
- FIG. 50 is a conceptual diagram showing how the threshold value differs depending on the amount of injected electrons.
- the vertical axis shows the threshold value, and the horizontal axis shows the frequency.
- three types of voltages for example, 15, 16, and 17 V
- electrons corresponding to the voltages are injected from the substrate into the floating gate electrode.
- the threshold voltage of the transistor differs depending on the difference in the amount of charge, and this is shown in FIG.
- each threshold voltage due to the difference in charge is illustrated as a distribution having peaks at 2.8V, 3.4V, and 5V, respectively. While emitting electrons In this case, the threshold value is distributed with a peak at 1.5 V.
- the state of the electrons stored in the floating gate electrode that is, the state in which the threshold value is different can be clearly distinguished.
- the logical distinction can be made.
- These distinguishable states correspond to four 2-bit states (00, 01, 10, 11), and one memory cell can store two bits.
- the state where electrons are emitted peak peak is 1.5 V
- the state where the threshold is 2.8 V is set to '10'
- the threshold is set to '10'.
- the state with a peak of 3.4V can correspond to '00
- 'and the state with a peak of 5V can correspond to '01.'
- FIG. 51 is a chart showing a control voltage applied to a memory cell in a data read, write, and erase operation performed in the present embodiment, together with a conceptual diagram of the memory cell.
- Table 2 is an operation table showing operation states of respective members in FIG. 2 at the time of data read, write, and erase operations performed in the present embodiment.
- the electrons stored in the floating gate electrode of the memory cell in such a state perform the following operations.
- the electrons accumulated in the floating gate electrodes of all the memory cells connected to the word line W11 receive the action of the electric field corresponding to the potential difference (18 V) between the substrate and the control gate electrode, Released from the floating gate electrode to the substrate.
- W12 is 0V, so that the electron of the floating gate electrode is not applied with the electric field to be emitted to the substrate, and the electron is retained.
- the state is maintained. That is, the erase operation is performed for all the memory cells connected to W11, and the information is not rewritten for all the memory cells connected to W12. This erase operation lowers the threshold voltage of the memory cell on the selected word line W11, and the threshold voltage has a distribution having a peak near 1.5 V.
- the transistor may be turned off, and Dll, 012, 311, and S12 may be set to the floating state, and the substrate potential may be set to 2 V at the same time. Even in such a state, the erase operation is performed for all the memory cells connected to W11, and the information is not rewritten for all the memory cells connected to W12.
- unselected memory blocks eg, BL2
- D22 and S21 and S22 are set to the floating state, and at the same time, 0 V is applied to the word lines W21 and W22 to prevent rewriting of information.
- 10 V is applied to the gates S i D 1 of the selection transistors SD 11 and SD 12 to turn on SD 11 and SD 12 and at the same time, the global data Maintain the voltages on lines GD I and GD 2 at 0 V and 6.5 V, respectively.
- the voltage of the data line D 11 (write data line) of the selected memory cell Ml 1 is set to the voltage of GD 1 via SD 11, that is, 0 V, and the data line to which the unselected memory cell is connected is set.
- the voltage of D 1 2 (non-writing data line) is set to the voltage of GD 2 via SD 12, that is, 6.5 V.
- 0 V is applied to the gates S i S 1 of the selection transistors SS 11 and SS 12 to turn off the SS 11 and SS 12, whereby the source lines S 11 and S 12 Is in the floating state (OPEN).
- 11 and S 12 may be held at V ss (0 V).
- three types of voltages in the range of 14.9 V to 17 V are sequentially applied to the lead line Wl 1 selected by XDEC 1 for a certain period of time, while 4.5 V is applied to unselected word lines. Is applied. At this time, a voltage of 0 V is applied to the P-type well region.
- Electrons of a charge amount corresponding to the voltage of the word line W11 are injected into the floating gate electrode of the selected memory cell M11 placed in this state, and the stored information is W3 of W11. It is divided into four states: the type of voltage and the state that is not written. When a voltage of 14.9 V to 17 V is applied to W11 and electrons are injected into the floating gate electrode, the source region is in the open state and the drain region (data line) is at 0 V. Therefore, an electron channel is formed on the entire lower surface of the tunnel oxide film, and the tunnel current flows on the entire surface of the tunnel oxide film.
- the memory cell can be miniaturized and high integration of the AND type flash memory can be realized.
- the current density of the tunnel current can be reduced to suppress the deterioration of the tunnel oxide film, thereby improving the reliability of the AND flash memory.
- the element isolation withstand voltage of the memory cell must be 18 V or more.
- the isolation voltage of the selection transistor must be 12 V or more.
- the memory cells are separated by the shallow trench isolation in which the insulating film is buried, so that the required breakdown voltage is secured.
- FIG. 52 is a flowchart showing an example of the write sequence.
- the write data is latched by the latch circuit LATCH (step A).
- writing is performed for the '01' data (step B).
- '0 1' data is recorded as a threshold distribution with a peak near 5 V as described above. However, since there is a certain distribution, verify whether the data has been written normally (verify).
- Step C The verification voltage is 4.5V. At this time, if the data has not been written normally (Fail), the process returns to step B, and the data for '01' is written again.
- step D If it is verified in step C that the '01' data has been normally written, then the '00' data is written (step D).
- the '00' data is recorded as a threshold distribution with a peak around 3.6 V as described above, but it has a certain distribution, so it is verified whether or not data was written normally (verify ) Yes (Step E).
- the verification voltage is 3.6V. At this time, if the data has not been properly written (Fail), the process returns to step D, and the data for '00' is written again.
- step F If it is verified in step E that the '00' data has been written normally, then the '10' data is written (step F).
- the '10' data is recorded as a threshold distribution with a peak around 2.8 V as described above, but there is some distribution, so verify whether it was written correctly (verify) (Ste G).
- the verification voltage is 2.8V.
- the process returns to step F, and the data for '10' is written again.
- step H weak writing is performed for all bits. As a result, all bits are written.
- step I disturb detection of the '1 1' word is performed (step I), then elastic detection of the '10, word is performed (step) ', and then elastic detection of the' 00 'word is performed. Do (step).
- the detection voltages are 2. IV, 3. IV, and 3.9 V, respectively. If an eratic or disturb is detected in steps I to K (Fai1), the written data is erased (step L), and the process returns to step B to retry the writing of '01' data. If both detections pass, the writing is terminated (step M).
- the voltage of the selected word line is controlled by XDEC 1 to provide three types of voltages (2.4 V, 3.2 V, 4.0 V) in the range of 2.4 V to 4.0 V.
- a voltage of 1 V is supplied to the local data line and a voltage of 0 V is supplied to the local source line via the selection transistor.
- Reading is performed with the channel current according to the threshold voltage of the memory cell on the selected word line, and 2 V is applied to the selected word line to perform the same detection. As a result, a quaternary threshold voltage can be detected. At this time, 0 V is applied to the unselected word lines. Note that reading is performed in ascending order of threshold voltage.
- the disturb phenomenon caused by the bit line in each operation can be prevented by turning off all the select transistors SD21 and SD22 and SS21 and SS22 of the unselected block.
- FIG. 53 is a plan view showing a part of the structure of the memory cell and the select transistor of the AND-type flash memory according to the present embodiment.
- FIG. 53 shows a portion of the select transistors SD 11 and SD 12 and a part of the memory cell array MEMARRAY on the drain region side (data lines D 11 and D 12 side) shown in FIG. , The structure on the SS 12 side is omitted.
- the AND type flash memory includes a memory cell M (Mi1 to M22, N11 to N22), a selection transistor SD (SD11, SD12) and a selection transistor SD (SD11, SD12). It has a transistor SS (SSI 1, SSI 2) (not shown). Further, similarly to the first embodiment, the word line 301 (8) (word wirings Wl1 to W22) functioning as the control gate electrode of the memory cell M, the element isolation region 3 02 (19), a source region 303 (11), a drain region 304 (10), and an element isolation region 305 (5). Therefore, the description is omitted.
- the device isolation regions 302 (19) and 305 (5) are formed before processing the floating gate electrode of the memory.
- the source regions 11 and 303 and the drain regions 10 and 304 have a shallow junction and a symmetric structure as in the first to fourth embodiments.
- the second-layer metal wiring M2 functioning as the global data line GD (GD I, GD2) indicated by the broken line in FIG. 53 is selected via the through hole 316 and the first-layer metal wiring Ml and the contact hole 306.
- the drain region 307 of the transistor SD is connected, and the source region 308 (21) of the select transistor SD is connected to the drain region 304 (10).
- the second-layer metal wiring M2 which functions as a common source line indicated by a broken line in the figure, is connected to the first layer via the through-holes 3 16 at the same interval as the intervals of the 128 memory local source lines.
- the first layer metal wiring Ml is connected to the source region 303 (11) of the selection transistor SS (not shown) via a contact hole (not shown), and the drain of the selection transistor SS (not shown) is connected.
- the region (not shown) is connected to the source region 303 (11) in the memory cell block.
- the form of connection in this manner is the same as that of the first embodiment in which the connection is made to the source region 308 (21) and the S drain region 304 (10) of the select transistor SD.
- the common source line may be drawn in the data line direction by the second metal wiring M2 and drawn out in the word line direction by the first metal wiring.
- the gate electrode 312 of the selection transistor SD is made of the wiring material of the lead line 301 (8) above the floating gate. The same applies to the gate electrode material of the selection transistor SS (not shown).
- a buffer gate 315 for forming transistors is formed between the memory cell M and the selection transistors SD and SS.
- the buffering gut 315 is composed of a floating gate electrode and a word line as described later, and each electrode material is connected to a metal line via a contact hole to form a memory cell. It is electrically connected to the channel 208 and is fixed at the same potential.
- the local bit line (304 (10)) on the select transistor SD side is buffered. Is electrically connected to the source region 308 (2 1) of the select transistor SD through the lower portion of the gate gate 3 15 region, and the local source line (303 (1 1)) is terminated at the lower portion of the buffer gate 3 15 region. . Similar to the first embodiment, the local bit line and the local source line are also arranged on the select transistor SS side in an inverted arrangement.
- the transistor region of the memory cell ⁇ is a region indicated by the floating gate electrode 314 (3, 7).
- the floating gate electrodes 3 14 (3, 7) are formed below the word lines 301 (8), and the first-layer floating gate electrodes 314 a (3) and the second-layer floating gate electrodes 314 b (7 ).
- the first layer floating gate electrode 314a (3) is defined between the source region 303 (11) and the drain region 304 (10) of the memory cell.
- the second-layer floating gate electrode 314 b (7) is disposed above the first-layer floating gate electrode 314 a (3), and the word line 301 (8) and the floating gate electrode 3 14 (3, 7) Has been determined.
- FIG. 54 is a cross-sectional view showing one example of the AND-type flash memory of the present embodiment.
- a region A indicates a peripheral circuit formation region (peripheral circuit portion)
- regions B and C indicate a memory cell formation region (memory cell portion) which is a memory cell array region.
- the memory cell shown in the B area shows a cross section taken along the line BB shown in FIG.
- a shallow groove isolation (Shallow Groove Isolation) structure element isolation region 204 (305 (5)) is formed on the main surface of the semiconductor substrate 201.
- a template region 207 is formed on the main surface of the semiconductor substrate 201.
- a part of the p-type well region 208 (particularly, the p-type well region 208 in the memory cell region) is The p-type semiconductor substrate 201 is separated from the p-type semiconductor substrate 201 by an n-type p-type region 206 formed in a deeper region so as to surround the p-type p-type region 208.
- the element isolation region 201 separates a MISFET of a memory cell and a peripheral circuit, which will be described later, and, although not shown, provides a channel stop region made of a p-type impurity thereunder to more effectively isolate the element. May be.
- the minimum width of the element isolation region 204 is, for example, 0.35 / zm.
- the memory cell M and the select transistor SD are formed on the main surface of the p-type module region 208 in the memory cell formation region (B region and C region), and the buffer gate 315 is also formed on the main surface. Have been.
- the memory cell M has a floating gate composed of a first floating gate electrode 2 11 and a second floating gate electrode 2 18 formed on a tunnel oxide film 210 which is a gate insulating film having a thickness of about 9.5 nm. It has electrodes.
- the first floating gate electrode 211 is formed of a polycrystalline silicon layer having a thickness of about lOO nm, and has a gate length of 0.25 zxm, for example.
- the side surface of the first floating gate electrode 211 is covered with a side wall spacer 214 made of an insulating film.
- An insulating film 216 is formed on the element isolation region 204 on the side surface of the insulating film (side wall spacer) 214.
- the second floating gate electrode 2 18 is formed on the first floating gate electrode 211 and is made of a polycrystalline silicon layer having a thickness of about 40 nm.
- the second floating gate electrode 218 and the first floating gate electrode 211 are electrically connected.
- the width of the second floating gate electrode 2 18 is, for example, 0.85 ⁇ .
- a silicon oxide film having a thickness of 57/3/11 nm is formed on the second floating gate electrode 218 and the insulating film 216.
- An insulating film 219 is formed on the interlayer insulating film 219.
- a control gate electrode (word line 301 (8)) composed of a polycrystalline silicon layer 223 and a WSi 2 layer 224 having a thickness of 50 and 120 nm, respectively, is disposed. I have.
- an insulating film 225 formed by a CVD method and having a thickness of about 50 nm is formed above the control gate electrode.
- the source region (source line 303 (1 1)) and the drain region (data line 304 (1 0 )) are formed.
- the semiconductor regions 303 (11) and 304 (10) of the memory cell are electrically connected to the selection transistor SD or SS as described above.
- the selection transistor SD has a gate electrode composed of a polycrystalline silicon layer 223 and a WS i 2 layer 224 formed on the gate insulating film 220.
- the element isolation region 302 (19) of the select transistor SD or SS is formed in the same step as the element isolation region 305 (5) of the memory cell, and the element isolation width is 0.35 ⁇ .
- the gate oxide film 220 has a thickness of 25 nm and is formed in the same process as the gate oxide film 220 in the peripheral circuit region.
- the gate width of the select transistor is, for example, 0.75 zm.
- a buffer gate electrode 315 is formed between the memory cell M and the select transistor SD.
- the buffer gate electrode 3 15 is composed of the material of the first floating gate electrode 2 11 and the second floating gate electrode 2 18 and the word line material composed of the polycrystalline silicon layer 223 and the WSi 2 layer 224. It has a partially overlapping structure, and includes a tunnel oxide film 210 below the material of the first floating gate electrode 211 and a gate oxide film 220 between the lead wire material and the p-type well region 208.
- the buffer gate electrode 315 is electrically connected to the p-type well region 208 and is fixed at the cell region potential (or substrate potential).
- a p-type semiconductor region 228 is formed between the memory cells M, thereby separating the memory cells in the column direction.
- a low-concentration n-type impurity semiconductor region 227 and a high-concentration n-type impurity semiconductor region 232 are formed between the buffer gate electrode 315 and the select transistor SD.
- the size of each gate is such that the word line width of the memory cell is, for example, 0.25 ⁇ m and the pitch is, for example, 0.5 ⁇ .
- the line width of the buffer gate electrode 315 is, for example, 1 ⁇ , and the line width of the selection transistor is, for example, 0.9 ⁇ .
- ⁇ -channel MIS FETs Qn1, Qn2 and p-channel MISF ETQp are formed in the peripheral circuit area ( ⁇ area).
- the gate electrodes of the n-channel MIS FETs Qn 1 and Qn 2 and the p-channel MIS FET Qp are formed on the gate insulating film 220 and include a polycrystalline silicon layer 223 and a WS i 2 layer 224.
- the insulating film 230 is formed on the memory cell M, the buffer gate electrode 3 15, the selection transistor SD, the n-channel MIS FETQn 1, Qn 2 and the p-channel MIS FETQp 8, and the first layer is formed on the insulating film 230.
- a metal wiring M 2 (not shown) serving as a data line is formed so as to be orthogonal to the wiring Ml and the control gate electrode.
- FIGS. 55 to 77 are cross-sectional views or plan views illustrating an example of a manufacturing process of the AND flash memory according to the fifth embodiment in the order of processes.
- FIGS. 55 to 77 are cross-sectional views or plan views illustrating an example of a manufacturing process of the AND flash memory according to the fifth embodiment in the order of processes.
- the plan view only the memory cell areas (B and C areas) are shown.
- a silicon oxide film 202 and a silicon nitride film 203 are deposited (deposited) on a p-type semiconductor substrate 201, and then photolithography is performed so that a region to be an element isolation region 204 is opened.
- the silicon nitride film 203 is removed by dry etching using this as a mask.
- the semiconductor substrate 201 is dry-etched by about 0.35 ⁇ to form a shallow groove in a region to be the element isolation region 204.
- the inside of the shallow groove of the semiconductor substrate 201 is oxidized to form a silicon oxide film having a thickness of about 30 nm, and then an insulating film (silicon oxide film) is formed by a CVD method. Deposit (deposit) about ⁇ . Thereafter, after performing thermal oxidation, a silicon nitride film having a thickness of about 200 nm is formed on the entire surface of the insulating film by a CVD method (not shown), and a wide element isolation region 204 is formed by photoetching. This is patterned so that the silicon nitride film remains only at the portion where the silicon nitride film remains.
- the silicon nitride film and the insulating film are polished and flattened by a CMP (Chemical Mechanical Polishing) method, and the insulating film is embedded in the shallow groove. This polishing is performed until the silicon nitride film 203 is exposed. At this time, the silicon nitride film 203 functions as a rubber film for polishing by CMP.
- CMP Chemical Mechanical Polishing
- the silicon nitride film 203 is removed by, for example, wet etching using hot phosphoric acid.
- the peripheral circuit region (A region), the element isolation region 204 of the memory cell and the selection transistor region (A region and B region) are simultaneously formed.
- the insulating film (silicon oxide film) is formed in the shallow groove.
- a buried element isolation region 204 is formed, and a plan view of the semiconductor substrate 201 on which the element isolation region 204 is formed is shown in FIG. 57 for the memory cell regions (B and C regions).
- the width of the active region sandwiched between the element isolation regions 204 is, for example, 0.75 ⁇ m, and the width of the element isolation region 204 is, for example, 0.35 / m.
- the element isolation regions 204 of the memory cell portion and the select transistor portion are simultaneously formed in this step.
- a sacrificial oxide film 209 is formed on the surface of the semiconductor substrate 201, and further, phosphorus (P) is ion-implanted into the semiconductor substrate 201 with high energy using a photo resist as a mask to form a deep region. Then, an n-type cell region 206 is formed. Next, using the photo resist as a mask, phosphorus is ion-implanted several times in energy and dose amounts to form an n-type gate region 207. Thereafter, boron (B) is ion-implanted several times with energy and dose using the photoresist as a mask to form a p-type well region 208. Although not shown in the figure, boron may be ion-implanted into the memory cell and the select transistor portion to form a channel stopper region. Similarly, boron ions may be implanted into the memory cell to form a channel region.
- a silicon oxide film 210 of, eg, 9.5 nm is formed by thermal oxidation.
- a non-doped polycrystalline silicon film (conductive film) 211 having a thickness of, for example, 100 nm and a silicon nitride film (insulating film) 211 having a thickness of, for example, 200 nm are formed by CVD. Are sequentially deposited (deposited). The polycrystalline silicon film 211 in the B and C regions will later become the first floating gate electrode.
- the photo-etching process is used to define the gate length of the first floating gate electrode in the memory cell, and the semiconductor substrate 20 in the select transistor portion (part of the C region) and the peripheral circuit portion (A region).
- the silicon nitride film 2 12 is dry-etched.
- the resist is removed, and the polycrystalline silicon film 211 is dry-etched using the silicon nitride film 211 as a mask.
- the semiconductor substrate 2 is formed by the impurities implanted in the ion implantation step described below. 0 1 impurity concentration And distribution is not affected. Further, the surface of the semiconductor substrate 210 in the selected transistor portion and the peripheral circuit portion is not damaged by the CMP process described later. As a result, the performance of the AND type flash memory can be improved and the process can be stabilized.
- arsenic (As) ions are implanted into the substrate under the conditions of a dose of 1 ⁇ 10 14 atoms / cm 2 and an accelerating voltage of 40 keV to form a semiconductor region 213 of a memory cell. .
- FIG. 59 shows a plan view of the polycrystalline silicon film 211 and the silicon nitride film 212 and the semiconductor region 211 of the memory cell thus formed.
- the polycrystalline silicon film 211 serving as the first floating gate electrode and the silicon nitride film 212 thereon are protected in a striped column pattern (line pattern in the column direction) in the memory cell portion and protected in the select transistor portion. It is arranged so that it covers (covers). In this way, a recess is formed between the column patterns in the row direction.
- the line width of the silicon nitride film 212 in the memory mat is, for example, 0.25 ⁇ , and the interval is, for example, 0.85 / xm.
- the polycrystalline silicon film 211 and the silicon nitride film 212 and the semiconductor region 213 of the memory cell are formed in an active region between the element isolation regions 204.
- the semiconductor region 2 13 of the memory cell becomes a source region 303 (1 1) and a drain region 304 (10), which is later connected to the drain region 308 (2 1) of the select transistor SD.
- the side to be connected (drain region 304 (10)) is formed longer, and the side not connected (source region 303 (11)) is formed shorter.
- a silicon oxide film as an insulating film having a thickness of about 150 nm is formed by the CVD method, and the silicon oxide film is anisotropically etched to form a polycrystalline silicon film 2.
- Side spacers 214 are formed on the side surfaces (sidewalls) of the silicon nitride film 211 and the silicon nitride film 211.
- arsenic (A s) ions are implanted into the substrate under the conditions of a dose of 1 ⁇ 10 15 atoms / cm 2 and an accelerating voltage of 40 keV to form a semiconductor region 215 of a memory cell. I do.
- the silicon nitride film 212 becomes a mask, and unnecessary implantation into the floating gate and the peripheral circuit portion does not occur.
- the source region and the drain region 213 and 215 are formed by the same ion implantation process. It has a symmetrical structure and shallow junction.
- a silicon oxide film 216 as an insulating film having a thickness of, for example, 500 nm is deposited (deposited) by the CVD method.
- the unevenness formed by the polycrystalline silicon film 211 and the silicon nitride film 211 processed into a stripe-shaped column pattern in the memory cell region is buried.
- the silicon oxide film 216 is polished by about 380 nm by the CMP technique so that the first floating gate electrode can be polished between column patterns and on the element isolation region 204.
- the silicon oxide film 216 is formed such that the surface position of the silicon oxide film 216 becomes substantially uniform. That is, the surface position of the silicon oxide film 211 is formed almost uniformly.
- the silicon oxide film 211 is etched to the silicon nitride film 212 by dry etching while maintaining the same surface uniformity.
- the etching rates of the silicon oxide film 211 and the silicon nitride film 212 are almost the same.
- the dry etching etches the silicon nitride film 212 to almost half the thickness thereof. This is because the thickness of the silicon nitride film 211 before etching is large, and the difference (step) between the surface position of the polycrystalline silicon film 211 described later and the surface position of the silicon oxide film 211 is too large. This is because the processing of the polycrystalline silicon film 211 becomes difficult.
- the silicon oxide film (insulating film) 216 with the unevenness is buried so that the surface position becomes uniform in the memory cell portion.
- the silicon nitride film 212 is used for detecting the etching end point in the dry etching of the upper silicon oxide film.
- the silicon nitride film 212 plays a role of protecting the floating gate electrode from CMP and dry etching. Further, since the peripheral circuit portion is also covered with the silicon nitride film 212, the underlying film is not scraped by the above-mentioned etching, and no dating occurs.
- the etching is not limited to dry etching, but may be wet etching.
- the difference in etching speed is greater than dry etching depending on the film quality.
- the uniformity of the surface position of the film 2 16 can be improved.
- the silicon nitride film 212 is removed with hot phosphoric acid to expose the underlying polycrystalline silicon film.
- a 40-nm-thick Lind-polycrystalline silicon film 218 having an impurity concentration of about 4.7 ⁇ 10 20 atoms / cm 3 is deposited (deposited) by a CVD method, and 2 Process to become a floating gate electrode.
- the peripheral circuit section and the select transistor section are covered and protected by the second floating gate electrode.
- the surface position of the silicon oxide film 216 below the second floating gate electrode (polycrystalline silicon film 218) is set higher than the surface position of the first floating gate electrode (polycrystalline silicon film 221). Be composed.
- the capacitance between the second floating gate electrode 2 18 and the source / drain regions 2 13, 215, 10, 11 can be reduced.
- characteristics of a memory cell can be improved.
- the polycrystalline silicon film 218 covers the polycrystalline silicon film 211 serving as the first floating gate electrode in the memory cell portion, and is formed on the silicon oxide film 216. It is arranged so as to extend in a stripe shape, and to protect (cover) in the select transistor portion.
- the width of the stripe that is, the line width of the second floating gate electrode is, for example, 0.85 ⁇ m, and the interval is, for example, 0.25 ⁇ .
- the surface on which the phosphorus-doped polycrystalline silicon film 218 is deposited has a high flatness because the silicon oxide film 216 is embedded. For this reason, the exposure light in photolithography is unlikely to be scattered, and the processing accuracy can be improved and miniaturization can be facilitated. As a result, the degree of integration of the AND type flash memory can be improved. Further, the capacitance between the second floating gate electrode 2 18 and the source / drain regions (semiconductor regions 213 and 215) can be reduced, and the characteristics of the memory cell can be improved.
- an interlayer insulating film 219 made of a silicon oxide film, a silicon nitride film, a silicon oxide film, and a silicon nitride film having a thickness of, for example, 57/3 nm is formed by CVD or the like.
- the peripheral circuit portion and the interlayer insulating film 219 of the select transistor, the second polycrystalline silicon film 218, and the first polycrystalline silicon film 211 are removed by a photoetching process.
- the pattern 255 is the buffer gate electrode 31 existing between the memory cell portion where the first and second floating gate electrodes are formed in a stripe shape and the region where the select transistor SD is formed.
- the memory mat is placed so as to protect (cover) the area near the center of the area where 5 is formed.
- a sacrificial oxide film is formed by thermal oxidation. After ion implantation to form a channel region, the sacrificial oxide film is removed, and a 25-nm-thick oxide film 220 is formed by thermal oxidation.
- the oxide film 220 becomes a gate insulating film of the n-channel MIS FETQn 1 and Qn 2 of the peripheral circuit, the p-channel MIS FETQp, and the select transistor SD.
- a WS i 2 film 224 and a silicon oxide film 225 having a thickness of about 150 nm are sequentially formed.
- FIG. 70 shows a plan view after processing.
- the minimum gate length of the n-channel MISF ETQ n 1 and Q n 2 is, for example, 1 // m
- the minimum gate length of the p-channel MIS FET Qp is, for example, 1.1 // m.
- the gate length of the select transistor SD is, for example, 0.2, and the head line width (gate width) of the memory cell is, for example, 0.25 m.
- the WSi 2 film 224 and the third polycrystalline silicon film 223 are sequentially processed using the silicon oxide film 225 as a mask. In this manner, the WS i 2 film 224 and the third polycrystalline silicon film 223 become gate electrodes of the n-channel MISFETQ n 1 and Qn 2 and the p-channel MISFETQ p in the peripheral circuit region (A region). In the cell area (B and C areas), the area becomes the gate electrode (312) of the select transistor SD and the word line (305 (5), control gate electrode) of the memory cell.
- control gate electrode (word line) 305 (5) extending in the row direction is formed by patterning in the direction perpendicular to the direction in which the column pattern extends.
- the interlayer insulating films 2 19, 1, 2, and 3 are masked using the photoresist PR and the silicon oxide film 225 as a mask.
- the second polycrystalline silicon films 21 1 and 21 8 are sequentially processed (FIG. 72).
- the word line 301 (8), the selected transistor SD, and the buffer gate electrode 3 15 are formed.
- the second patterning of the photoresist PR is arranged on the buffer gate electrode 315 so as to open the memory cell portion.
- the upper surface of the buffer gate electrode 315 is patterned so that the surface of the second floating gate electrode is exposed.
- the region where the n-channel MI SFETs Qn1 and Qn2 of the peripheral circuit portion are formed is formed.
- the photoresist is patterned so as to have openings, and for example, phosphorus (P) ions are implanted into the substrate under the conditions of a dose of 2 ⁇ 10 13 atoms / cm 2 , an acceleration voltage of 60 keV, and an n-channel of a peripheral circuit portion.
- the MIS FETs Qn1, Qn2 and the n-type low-concentration semiconductor region 227 in the selection transistor region inside the memory mat are formed.
- BF 2 ions are implanted into the substrate over the entire surface under the conditions of a dose of 4 X 10 I 2 atoms m 2 and an acceleration voltage of 50 keV, and the p-channel of the peripheral circuit section A low concentration semiconductor region 228 is formed.
- a punch-through stop region (p-type semiconductor region) 228 is formed in the substrate region sandwiched between the word line and the source / drain region of the memory by implanting BF 2 ions.
- an insulating film 230 composed of a silicon nitride film having a thickness of about 20 nm and a silicon oxide film having a thickness of about 200 nm is formed by a CVD method.
- a side wall spacer 230 is formed on the side surface of the gate electrode by anisotropic etching.
- the photoresist is opened so that the n-channel MIS FETs Qn 1 and Qn 2 in the peripheral circuit section and the select transistor SD are opened.
- arsenic (As) ions are implanted into the substrate under the conditions of a dose of 5 ⁇ 10 15 atoms / cm 2 and an acceleration voltage of 50 keV to form an n-type high-concentration semiconductor region 232.
- p-channel MISF ETQ p of the peripheral circuit portion is patterned photoresist so as to open, for example, a dose of BF 2 ions 3 X 10 1 5 atoms / cm 2, in the substrate at an acceleration voltage of 50 ke V
- a p-type high-concentration semiconductor region 233 is formed.
- TEOS a tetramethylene Tokishishiran
- the photoresist is puttered and dry etched.
- Contact holes are formed in the interlayer film 235 and the silicon oxide film 234 in a 38 ⁇ m square pattern.
- a Ti (titanium) ZTiN (titanium nitride) film having a thickness of 40 nm and 100 nm is formed by sputtering, and a 500 nm-thick W film is formed. (Tungsten) film is formed by CVD method. After that, the W film on the surface is removed by dry etching. Thus, the plug electrode P shown in FIG. 54 is formed.
- a metal layer made of, for example, TiZA1-CuZTi / TiN is formed to a thickness of, for example, 10/200/10/75 nm, and the metal layer is patterned by a photoetching process.
- One-layer wiring Ml is formed. In this way, the AND-type flash memory shown in Fig. 54 is obtained.
- the metal layer is patterned as wiring for the peripheral circuit portion, and is patterned so as to connect the global data line and the semiconductor region of the selection transistor in the memory mat portion. Also, lead wires from word lines in the memory mat section to the decoder section are formed.
- the pitch of the contact holes 264 in the selection transistor portion is, for example, 1. l / xm
- the interval between the first-layer wirings M 1 is, for example, 0.4 ⁇ in the dock bone portion
- the first-layer wirings ⁇ 1 pitch For example, 1.1 ⁇ .
- the interval between the first-layer wirings Ml in the word line lead-out part is, for example, 0.42 in the dock bone part
- the wiring pitch is, for example, 1. ⁇ .
- the first layer wiring can be formed in a lattice shape on the memory cell as illustrated.
- a lattice shape facilitates the CM step used in the step of forming an interlayer insulating film formed between the first layer wiring and the second layer wiring.
- the grid-like wiring (Ml) on the memory cell makes the unevenness of the interlayer insulating film before CMP performed uniform, thereby preventing the dicing. If the grid-like wiring is not formed, it is inevitable that a recess having a large area is formed in this part, and dishing occurs in this region. No concave part is formed. As a result, the process load of CMP in the process of forming the interlayer insulating film can be reduced, and dicing can be prevented.
- the second layer wiring M2 can be formed as follows. After forming a silicon oxide film with a thickness of about 1 000 nm by the CVD method, the surface is polished by CMP, and then a silicon oxide film with a thickness of 400 nm is deposited (deposited) by the CVD method. Thereafter, the photoresist is patterned and dry etching is performed to form a through-hole having, for example, 0.44 ⁇ . Next, after ultraviolet irradiation, a composite film composed of a Ti / iiN film having a thickness of 40/100 nm and a W film having a thickness of 500 nm is formed. Thereafter, the W film on the surface is dry-etched to form a plug electrode inside the through hole.
- a metal layer made of TiZA1-CuZTi / TiN is formed with a thickness of, for example, 10Z400 to 10/75 nm.
- the metal layer is patterned by a photoetching process to form a second-layer wiring M2.
- the second layer wiring M2 is patterned as a wiring of the peripheral circuit part, and is patterned so as to become a global data line GD in the memory mat part as shown in FIG.
- the wiring interval of the selection transistor section is, for example, 0.48 // m in the dock bone section, and the wiring pitch is, for example, 1.1 / im.
- the first through holes 263 of the selection transistor section are alternately arranged.
- a silicon oxide film is formed by a CVD method of about m, followed by a second through hole of about 0.52 m opening, a plug electrode similar to the above, and a film thickness of, for example, 10/600 ⁇ 10/75 nm.
- the third-layer wiring M3 composed of Ti / A1-Cu / Ti / TiN can be formed.
- the third layer wiring M3 is patterned as a wiring of a peripheral circuit portion. At this time, the wiring width is, for example, 0.7 / m, and the interval is, for example, 0.8 ⁇ .
- the AND-type flash memory according to the present embodiment is a 256-Mbit flash memory that employs a storage method based on multi-valued logic, so that the capacity can be increased without increasing the physical bit capacity in the memory chip. Becomes possible.
- the adoption of shallow groove element separation can improve the reliability of AND-type flash memory.
- tunneling current for writing and erasing flows over the entire channel region of the memory cell, so that the element life is prolonged and the structure is suitable for miniaturization.
- scattering of exposure light is suppressed to improve processing accuracy.
- peripheral circuits and select transistor sections are laminated films including silicon nitride films. As a result, unnecessary impurity implantation and damage due to CMP can be prevented, and a high-performance AND flash memory can be manufactured.
- the process load can be reduced and the process margin can be increased.
- FIG. 78 is a plan view showing an example of an AND type flash memory according to the sixth embodiment with respect to a memory cell region.
- the AND flash memory according to the present embodiment has a buffer gate electrode and a select transistor formed integrally, and the other configuration is the same as that of the fifth embodiment. Therefore, only the differences from the fifth embodiment will be described below.
- the AND type flash memory according to the present embodiment has a gate electrode 600 in which a buffer gate electrode and a selection transistor are integrally formed.
- the gate electrode 600 has the same structure as the buffer gate electrode in terms of the structure of the gate electrode, but also functions as a selection transistor.
- FIG. 79 is a cross-sectional view of the AND flash memory according to the present embodiment. Select
- FIG. 80 and FIG. 81 are cross-sectional views showing a D portion in FIG. 79 in an enlarged manner.
- FIG. 80 shows a cross section taken along line EE in FIG. 78
- FIG. 81 shows a cross section taken along line FF in FIG.
- a gate electrode 600 having a configuration similar to that of buffer gate electrode 315 of the fifth embodiment is provided.
- the drain region 213 extends below the gate electrode 600, and the gate insulating film 220 and the polycrystalline silicon It reaches the lower part of membrane 222. Therefore, when the appropriate voltage to the polycrystalline silicon film 2 2 3 and W s 1 2 film 2 2 4 is applied, the channel between the drain region 2 1 3 and n-type low concentration semiconductor region 2 2 7 Is formed, and can function as a transistor. That is, the select transistor SD is formed, in which the lower region of the gate insulating film 220 and the polycrystalline silicon film 222 of the gate electrode 600 is used as a channel region.
- FIGS. 82 to 87 are plan views or cross-sectional views showing an example of a method of manufacturing the AND-type flash memory according to the sixth embodiment in the order of steps.
- the method for manufacturing the AND flash memory according to the present embodiment is the same as the steps up to FIG. 65 in the fifth embodiment.
- removing the interlayer insulating film 2 19, the second polycrystalline silicon film 2 18, and the first polycrystalline silicon film 2 11 by a photoetching process is the same as in the fifth embodiment.
- a pattern 610 is formed below the end of the drain region 213 to be the local data line 304 (10).
- the end of the drain region 21 3 is formed over the entire area below the floating gate electrode portion of the good electrode 600.
- the silicon oxide by the gate insulating film 2 2 0, the polycrystalline silicon film 2 2 3, W si 2 film 2 2 4, CVD method A film 225 is formed.
- the word line 301 (8) and the gate electrode 600 are formed in the memory cell region.
- the silicon oxide film 225, the Ws i 2 film 224, and the polycrystalline silicon film 223 are patterned so as to form ETQp.
- the pattern of the gate electrode 600 is formed by offsetting the distance L from the end of the drain region 304 (10). Accordingly, a channel length corresponding to the distance L is formed.
- the interlayer insulating film 219, the first and second polycrystalline silicon films 211 are formed using the silicon oxide film 225 as a mask. , 218 are processed sequentially.
- the word line 301 (8) and the select transistor SD having the gate electrode 600 are formed, respectively.
- a first layer wiring Ml is formed as in the fifth embodiment
- a second layer wiring M2 is formed as in the fifth embodiment.
- the third-layer wiring M3 can be formed in the same manner as in the fifth embodiment.
- the AND-type flash memory of the present embodiment it is not necessary to separately form the buffer gate electrodes, so that the area can be saved and high integration of the AND-type flash memory can be achieved.
- 88 to 99 are cross-sectional views or plan views showing an example of a method for manufacturing an AND flash memory according to Embodiment 7 of the present invention in the order of steps.
- an element isolation region 204 is formed on the main surface of a semiconductor substrate 201, and p-type and n-type well regions 206 to 208 are further formed. Then, after oxidizing the main surface of the semiconductor substrate 1 to form a gate insulating film 22 ° of about 25 nm, as shown in FIG. 88, an n-channel MIS FETQn 1 and a p-channel MIS FETQp are formed. The region to be formed is covered with a photomask 205, and the gate insulating film 220 on the main surface of the semiconductor substrate 1 is removed by etching. Next, a gate insulating film 210 thinner and thicker than the gut insulating film 220 is formed on the main surface of the semiconductor substrate 201.
- the photomask 205 is removed, and the polycrystalline silicon film 211, the silicon oxide film 700 similar to the fifth embodiment, and the silicon nitride film 211 similar to the fifth embodiment are removed.
- the silicon nitride film 2 is formed to serve as the gate electrodes of the n-channel MISF ETQ n 1 and the p-channel MISFE TQ p. 12 Pattern the silicon oxide film 700 and the polycrystalline silicon film 211, and reduce the n-channel MIS FETQn1 and p-channel MIS FETQp by ion implantation using the photoresist film and silicon nitride film 212 as a mask. Concentration semiconductor regions 239 and 240 are formed respectively.
- the impurities are extended and diffused at a high temperature.
- a high-breakdown-voltage MISFET can be formed.
- the silicon nitride film 212, the silicon oxide film 700, and the polycrystalline silicon film 211 are patterned so as to be the first floating gate electrode in the memory cell region, and the photoresist film and the silicon nitride film 21 are patterned.
- a low concentration semiconductor region 213 of a memory cell is formed by an ion implantation method.
- sidewall spacers 214 are formed on the side surfaces of the silicon nitride film 211, the silicon oxide film 700, and the polycrystalline silicon film 211, and the photoresist film, the silicon nitride film 212, and the side Using the electrode spacer 214 as a mask, the high-concentration semiconductor regions 241 and 242 of the n-channel MISFETQn1 and the p-channel MISFETQp and the high-concentration semiconductor region 215 of the memory cell are formed by ion implantation.
- a silicon oxide film 211 similar to that of the fifth embodiment is formed. Further, as shown in FIG. 91, the silicon nitride film 212 is removed as in the fifth embodiment. At this time, since the silicon nitride film 212 is removed by hot phosphoric acid, the silicon oxide film 700 on the polycrystalline silicon film 211 remains.
- a photoresist film 701 is formed on the n-channel MISFETQn1 and the p-channel MISFETQp, and the silicon oxide film 700 in other regions is removed by etching.
- a polycrystalline silicon film 218 similar to that of the fifth embodiment is formed, and is patterned so as to be a second floating gate electrode, as in the fifth embodiment.
- an interlayer insulating film 219 similar to that of the fifth embodiment is formed, and thereafter, a photoresist film 702 is formed and this is used as a mask to form a gate electrode of the n-channel MIS FETQn2.
- An opening 217 is formed in the region and the interlayer insulating film 219 in the region where the gate electrode of the select transistor SD is formed.
- An example of the shape of the opening formed here for the opening on the select transistor SD is shown in FIG. It is as follows.
- the opening is formed in a slit shape, but is not limited thereto, and may be a hole shape or a shape in which holes are arranged.
- FIG. 96 a polycrystalline silicon film 223, a WSi 2 film 224, and a silicon oxide film 225 formed by a CVD method are formed sequentially in the same manner as in the fifth embodiment. Further, as shown in FIG. 97, as in the fifth embodiment, a silicon oxide film 225, a WS i 2 film 224, a polycrystalline silicon film 223, an interlayer insulating film 2 19, a polycrystalline silicon film 2 18 The polycrystalline silicon film 211 is patterned.
- FIG. 98 shows a plan view of the word line 301 (8) and the gate electrode 312 of the select transistor SD after patterning.
- the peripheral circuit area is patterned so that the gate electrode of the n-channel MIS FETQn 2 is formed, and no resist pattern is formed on the n-channel MIS FETQn 1 and the p-channel MIS FETQp.
- the silicon oxide film 700 is formed on the gate electrodes of the n-channel MISF ETQn1 and the p-channel MIS FETQp, this serves as a mask and the gate electrode is not etched. Further, no buffer gate electrode is formed between the select transistor SD and the memory cell.
- This selection transistors SD of gate one gate electrode is silicon oxide film 225, WS i 2 film 224, the polycrystalline silicon film 223, the interlayer insulating film 21 9, the polycrystalline silicon film 2 1 8 and the polycrystalline silicon film 21 1 This is because there is no need to provide a buffer gate electrode because of the configuration. As a result, the area of the memory cell can be saved and high integration can be achieved. As described above, the gate electrodes of the memory cell, the selection transistor SD, and the n-channel MISF ETQ n2 are formed.
- Gate electrodes of selection transistors SD and n-channel MI S Qn 2 is constituted by WS i 2 film 224, the polycrystalline silicon film 223, a polycrystalline silicon film 2 18 and the polycrystalline silicon film 2 1 1, polycrystalline silicon
- the film 223 and the polycrystalline silicon film 218 are connected via an opening 217 formed in the interlayer insulating film 219.
- the gate electrode is composed of multiple layers, and in particular, the WSi2 film 224 with low resistivity is provided, so that the resistance value of the gate electrode is reduced to improve the response speed, and the performance of the AND flash memory is improved. Can be improved.
- an n-type low-concentration semiconductor region 227 and a punch-through stopper region 228 similar to those in the fifth embodiment are formed.
- the n-type high concentration semiconductor region 232 is formed.
- Subsequent steps are substantially the same as those of the fifth and sixth embodiments, and thus description thereof is omitted.
- the semiconductor region which is the source / drain region of the n-channel MIS FETQn 1 and the p-channel MISF ETQ ⁇ of the peripheral circuit is formed before forming the memory cell.
- the ⁇ channel MISF ETQ ⁇ 1 and the ⁇ channel MISF ETQ ⁇ can be applied to a transistor with a high breakdown voltage.
- a high heat treatment is not performed after the formation of the semiconductor region, which is the source / drain region, and the semiconductor region is formed at a shallow depth and a junction, so that the MISF can have excellent punch-through resistance.
- the AND-type flash memory since it is not necessary to provide a buffer gate electrode, the area occupied by the memory cell can be reduced to achieve high integration. Further, the n-channel MISF ETQn 2 and the selection transistor The performance of the AND type flash memory can be improved by reducing the resistance value of the gate electrode of SD.
- FIGS. 100 to 104 are cross-sectional views showing an example of the embodiment of the present invention, in which only the nonvolatile memory elements are described. MOS transistors used in peripheral circuits are omitted from the figure to prevent the drawing from becoming complicated.
- a 10-nm-thick thermal oxide film 802 is formed on a p-type silicon substrate 801, and is a 100-nm-thick polycrystalline silicon film 803 containing no n-type or impurities and containing no impurities Then, a silicon oxide film 804 having a thickness of 150 nm is sequentially deposited.
- the p-type silicon substrate 801 may be an n-type silicon substrate in which a p-type well region is formed in the region shown in the cross-sectional view.
- FIG. 101 shows that the production was advanced from FIG.
- the polycrystalline silicon film 803 and the silicon oxide film 804 are divided as shown in FIG. 101 using a photolithography technique and a dry etching technique to form a first floating gate electrode.
- ⁇ -type ions are implanted using the first floating gate electrode as a mask to form an ⁇ -type semiconductor region 805 on the surface of the ⁇ -type silicon substrate 801.
- the implantation is performed at about 1 ⁇ 10 15 atoms m 2 of arsenic with an acceleration energy of 40 keV, but may be changed according to a desired element structure and element characteristics.
- a silicon oxide film with a thickness of 150 nm is Then, a side wall spacer 806 is formed on the side wall of the first floating gate electrode by using anisotropic dry etching.
- FIG. 102 shows the processing that has been performed from FIG. Using an anisotropic dry etching technique, a groove is formed in the p-type silicon substrate 801 using the first floating gate electrode composed of the polycrystalline silicon film 803 and the silicon oxide film 804 and the sidewall spacer 806 as a mask. .
- the depth is 300 nm, but the depth may be changed according to the element isolation characteristics.
- a thermal oxide film 807 with a thickness of 5 nm is formed at a temperature of about 800 ° C on the surface of the silicon exposed in the groove, and a silicon oxide film 808 containing no impurities on the entire surface is formed with a thickness of 100 nm. Deposits at.
- the silicon oxide film 808 functions as a barrier for preventing impurities contained in the BPSG from diffusing into the p-type silicon substrate 801 and the n-type semiconductor region 805.
- a 500 nm BPSG film 809 is deposited on the entire surface.
- BPSG's fluidity it is processed at 850 ° C in a nitrogen atmosphere to fill the gap between elements, to flatten the surface, and to remove joints and voids.
- FIG. 102 is a view after the flattening heat treatment.
- FIG. 103 shows further processing from the state shown in FIG.
- the BPSG film 809 deposited on the entire surface is uniformly recessed by dry etching until the polycrystalline silicon film 803 is exposed.
- treatment is performed at 800 ° C for 20 minutes in an ammonia atmosphere, aiming at the effects described in Figs.
- a 50 nm-thick n-type polycrystalline silicon 810 is deposited, and the second floating gate electrode is formed using photolithography and dry etching techniques. Process into the shape of The polycrystalline silicon film 810 is formed for the purpose of increasing the surface area of the floating gate electrode.
- the polycrystalline silicon film 810 is in contact with the polycrystalline silicon film 803 of the first floating gate electrode without an insulating film therebetween.
- a 20 nm silicon oxide film 811 is deposited.
- 100 nm thick n-type polycrystalline silicon 812 is deposited.
- This polycrystalline silicon film 812 is patterned and becomes a control gate electrode.
- the first floating gate electrode 10 is connected through the polycrystalline silicon film 810 as the second floating gate electrode.
- Voltage is also applied to 3.
- the operating principle of this element is the same as, for example, Embodiments 1 to 7. Further, in Embodiments 1 to 7, it goes without saying that the BPSG film 809 of Embodiment 8 may be used as the insulating film to be polished by the CMP method.
- FIGS. 105 to 109 are cross-sectional views showing another example of the embodiment of the present invention, in which only a nonvolatile memory element is described.
- an element isolation region 900 having a thickness of 300 nm is formed on a p-type silicon substrate 901 by thermal oxidation.
- a 100-nm-thick polycrystalline silicon film 904 with a thickness of 100 nm formed by thermal oxide film 903 with no n-type or impurities, and a silicon oxide with a thickness of 150-nm without impurities Film 905 is sequentially deposited.
- the silicon substrate 901 may be an n-type silicon substrate in which a P-type well region is formed in the region shown in this cross-sectional view.
- FIG. 106 shows that the production was advanced from FIG.
- the polycrystalline silicon film 904 and the silicon oxide film 905 are divided as shown in FIG. 106 using a photolithography technique and a dry etching technique to form a first floating gate electrode.
- n-type ions are implanted using the first floating gate electrode as a mask to form an n-type semiconductor region 906 on the surface of the silicon substrate 901.
- the implantation is performed at about 1 ⁇ 10 15 atoms / cm 2 with arsenic at an acceleration energy of 40 keV, but it may be changed according to a desired element structure and element characteristics.
- a silicon oxide film having a thickness of 150 nm is deposited on the entire surface, and a silicon spacer 907 is formed on the side wall of the first floating gate electrode using anisotropic dry etching.
- FIG. 107 shows the processing that has been advanced from FIG. 106.
- a silicon oxide film 908 containing no impurities is deposited on the entire surface to a thickness of 100 nm.
- the silicon oxide film 908 functions as a barrier for preventing impurities contained in BPSG from diffusing into the n-type semiconductor region 906 and the silicon substrate 901.
- a 509 nm BPSG film 909 is deposited on the entire surface.
- Processing is performed in a nitrogen atmosphere at 850 ° C. in order to fill the space between the devices by using the fluidity of BPSG, to flatten the surface, and to remove joints and cavities.
- FIG. 107 is a view after the flattening heat treatment.
- FIG. 108 shows a state where the processing is further advanced from the state shown in FIG. 107. Deposited on the entire surface The BPSG film 909 thus formed is uniformly recessed by dry etching until the polycrystalline silicon 904 is exposed. Immediately after this, nitriding treatment is performed at 800 ° C. for 20 minutes in an ammonia atmosphere, aiming at the effects described in FIGS.
- FIG. 109 shows a state in which the processing is further advanced from the state shown in FIG. After cleaning the entire surface with hydrofluoric acid, an n-type polycrystalline silicon film 910 having a thickness of 50 nm is deposited. It is processed into the shape of the second floating gate electrode using photolithography and dry etching technology. Note that the polycrystalline silicon film 910 is formed for the purpose of increasing the surface area of the floating gate electrode.
- the polycrystalline silicon film 9104 is in contact with the polycrystalline silicon film 904 without any intervening insulating film therebetween.
- a 20 nm silicon oxide film 911 is deposited. Subsequently, 100 nm thick n-type polycrystalline silicon 912 is deposited.
- This n-type polycrystalline silicon 912 is patterned and becomes a control gate electrode.
- a voltage is applied to the n-type polycrystalline silicon 912, a voltage is also applied to the polycrystalline silicon film 904 via the silicon oxide film 911.
- the operating principle of this element is the same as that of the first to seventh embodiments.
- Embodiments 1 to 9 the case where the present invention is applied to an AND flash memory has been described.
- Embodiment 10 a case where the present invention is applied to a NOR flash memory will be described.
- the NOR flash memory is described in, for example, US Pat. No. 5,472,891.
- the source / drain region is formed by introducing impurities in a self-alignment manner with respect to the column pattern.
- the source / drain region is formed. Is formed after the formation of the control gate electrode (word line), and then a source line and a data line electrically connected to the source / drain region are formed.
- FIG. 1 12 is a main circuit diagram of the NOR flash memory of the present embodiment.
- FIG. 1 13 is a plan layout of the NOR flash memory of the present embodiment.
- FIG. FIG. 11 is a sectional view taken along the line AA in FIG. 11 and
- FIG. 11 (B) is a sectional view taken along the line BB in FIG. Since the MISFET forming the peripheral circuit is the same as in the first to ninth embodiments, the description is omitted.
- a word line WL formed integrally with the control gate electrodes 8 and 301 of the memory cell M and a source line SL are arranged so as to extend, and are arranged perpendicular to the row direction.
- the data lines DL and the element isolation regions 5, 305 are arranged to extend in the column direction (data lines).
- the memory cell M is arranged at the intersection of the word line WL and the data line DL, and the source line SL and the data line DL are formed above the memory cell M.
- the data line DL is electrically connected to the drain region 10 of the memory cell M
- the source line SL is electrically connected to the source region 11 of the memory cell M.
- the memory cells M are composed of MISFETs, and the memory cells M adjacent to each other in the row direction are element-isolated by element isolation regions 5 and 305.
- the element isolation regions 5 and 305 are configured with a shallow trench element isolation structure as in the first embodiment.
- the memory cell M is formed in a P-type well region 208 formed on the P-type semiconductor substrates 1 and 201, the P-type well region 208 is surrounded by an N-type well 206, and a P-type semiconductor Substrates 1, 201 are separated.
- the memory cell M includes a gate insulating film 2 formed on the main surfaces of the semiconductor substrates 1, 201, a first floating gate electrode 3 formed on the gate insulating film 2, and a first floating gate electrode 3.
- a first floating gate electrode is formed between a pair of N-type semiconductor regions 10 and 11, which are a source Z drain region formed in 1, 201 and a drain region 10 and a source region 11. 3 and a P-type p-type region 208 which is a channel region located below. That is, the channel region is arranged between the drain region 10 and the source region 11 in the column direction.
- the source line SL is formed in a self-aligned manner with respect to the first and second floating gate electrodes 3 and 7, the control gate electrode 8, and the sidewall spacer 20 formed on the side wall of the insulating film 17. It is electrically connected to source region 11 of memory cell M.
- the interlayer insulating film 128 is formed above the source line SL, and the data line DL formed above the interlayer insulating film 128 is formed in the contact hole formed in the interlayer insulating film 128. It is electrically connected to the drain region 10 of the memory cell M via 306.
- a side wall spacer 3 is formed on the side wall of the first floating gate electrode 3, and a groove 117 is formed in a self-aligned manner with the side wall spacer 3.
- the insulating films 5, 305 are buried in the trenches 117, and the surface positions of the insulating films 5, 305 are planarized so as to be substantially uniform between the first floating gate electrodes 3 and in the memory cell portion. ing.
- the insulating films 5 and 305 are buried in the trenches 117 and the trenches 117 to form shallow trench isolation regions.
- the second floating gate electrode 7 is formed to extend over the insulating films 5 and 305, and increases the capacitance between the control gate electrode 8 and the second floating gate electrode 7.
- the grooves 117 are formed in a self-aligned manner with respect to the side wall spacer 3, the interval between the memory cells M in the row direction can be reduced, and the cell size can be reduced. Therefore, high integration can be achieved.
- a P-type semiconductor region serving as a channel stopper may be formed below the groove 117.
- FIGS. 11A, 11B, 11A and 11B are cross-sectional views showing an example of a method of manufacturing a NOR flash memory in the order of the steps.
- FIG. 116, FIG. 118, and FIG. 120 are plan views showing an example of a method for manufacturing a NOR flash memory in the order of steps.
- the gate insulating film 2 is formed on the main surfaces of the semiconductor substrates 1 and 201, and the first polycrystalline silicon is formed on the gate insulating film 2.
- the first polycrystalline silicon film 111 and the insulating film 113 are etched.
- the gate width of the memory cell M (the first floating gate electrode 3) is defined by the pattern jung.
- the peripheral circuit portion is covered with a first polycrystalline silicon film 111 and a silicon nitride film 113 as in the first embodiment.
- the sidewall spacers 4 and 1 16 are formed.
- the grooves 117 are self-aligned with the side wall spacers 4 and 116 by etching.
- the insulating film 119 ′ deposited on the entire surface of the substrate is polished by a CMP method to form insulating films 5, 305, and 119 flattened to the insulating film 113.
- a second polycrystalline silicon film 120 is deposited. After that, the second polycrystalline silicon film 120 is patterned by etching to form a second column pattern extending in the column direction. This patterning defines the length of the second floating gate electrode in the row direction.
- the third polycrystalline silicon film 122 is formed.
- a WSi film 123 and an insulating film 124 are sequentially deposited.
- the polycrystalline silicon film 111 is patterned by etching to form word lines (control gate electrodes) 8, 301 composed of the WSi film 123 and the third polycrystalline silicon film 122,
- the floating gate electrodes 3 and 7 composed of the polycrystalline silicon film 111 and the second polycrystalline silicon film 120 are formed.
- the first floating gate electrode 3 is composed of a first polycrystalline silicon film 111
- the second floating gate electrode 7 is composed of a second polycrystalline silicon film 120.
- the word lines (control gate electrodes) 8, 301 are patterned so as to extend in the row direction, and are formed integrally with the control gate electrodes 8 of the memory cells M arranged in the row direction.
- an impurity is introduced into the insulating film 124 in a self-aligned manner to form a pair of N-type semiconductor regions serving as a drain region 10 and a source region 11, and then the insulating film 124, WSi On the side walls of film 1 2 3, third polycrystalline silicon film 1 2 2, interlayer insulating film 1 5, 1 2 1, second polycrystalline silicon film 1 2 0, 1st polycrystalline silicon film 1 1 1 A side wall spacer 20 is formed.
- the conductive film is patterned by etching, extends in the row direction, and extends in the source region of the memory cell M.
- a source line electrically connected to the region 11 is formed.
- the conductive film is made of, for example, a metal film such as a polycrystalline silicon film or a w film into which impurities are introduced.
- the data line DL is made of, for example, a metal film such as an A1 film.
- the force for performing the planarization of the insulating films 5, 305, 119 by CMP may be used by CMP and etching as shown in the fifth embodiment.
- the insulating films 5, 3 0 5, 11 1 are flattened in the grooves 1 17 formed in self-alignment with the sidewall spacers 4, 1 16.
- 9 was formed, it is needless to say that the present invention is not limited to this and may be configured as shown in the fifth embodiment.
- the groove 1 17 is formed in a self-aligned manner with respect to the side wall spacers 4 and 1 16.
- the insulating film 113 as a mask and forming a groove 117 by etching, as shown in Fig. 122, the insulating film 5, 300, 1 It is possible to form 1 9.
- the second floating gate electrode 7 is formed so as to extend over the insulating films 5, 305, and 119.
- the interval between the memory cells M in the row direction can be further reduced, and the cell size can be reduced, so that higher integration can be achieved.
- the so-called NAND type can be configured because the source region and the drain region of the memory cell M are connected in series.
- the selection MISFET may be provided.
- the nonvolatile semiconductor memory device and the method for manufacturing the same and the semiconductor device and the method for manufacturing the same according to the present invention are suitable for fine processing and high integration and have high reliability. Yes, especially suitable for AND flash memory.
Description
Claims
Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
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US09/402,078 US6461916B1 (en) | 1997-03-28 | 1998-02-20 | Non-volatile semiconductor memory and method of making same, and semiconductor device and method of making the device |
KR1019997008647A KR100604960B1 (ko) | 1997-03-28 | 1998-02-20 | 불휘발성 반도체 기억장치 및 그 제조방법 및 반도체 장치 및 그 제조방법 |
JP54139998A JP4065572B2 (ja) | 1997-03-28 | 1998-02-20 | 半導体装置 |
TW087103216A TW427032B (en) | 1997-03-28 | 1998-03-05 | Semiconductor device and the manufacturing method thereof |
US10/173,158 US20020192887A1 (en) | 1997-03-28 | 2002-06-18 | Non-volatile semiconductor memory and method of making same, and semiconductor device and method of making device |
US10/851,350 US7195976B2 (en) | 1997-03-28 | 2004-05-24 | Non-volatile semiconductor memory and method of making same, and semiconductor device and method of making device |
US10/954,096 US7179711B2 (en) | 1997-03-28 | 2004-09-30 | Non-volatile semiconductor memory and method of making same, and semiconductor device and method of making device |
US10/954,102 US7141475B2 (en) | 1997-03-28 | 2004-09-30 | Non-volatile semiconductor memory and method of making same, and semiconductor device and method of making device |
US11/107,826 US7528036B2 (en) | 1997-03-28 | 2005-04-18 | Non-volatile semiconductor memory and method of making same, and semiconductor device and method of making device |
US11/266,430 US7304345B2 (en) | 1997-03-28 | 2005-11-04 | Non-volatile semiconductor memory and method of making same, and semiconductor device and method of making device |
US11/862,928 US7692234B2 (en) | 1997-03-28 | 2007-09-27 | Non-volatile semiconductor memory and method of making same, and semiconductor device and method of making device |
Applications Claiming Priority (4)
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JP9/77175 | 1997-03-28 | ||
JP7717597 | 1997-03-28 | ||
JP18210297 | 1997-07-08 | ||
JP9/182102 | 1997-07-08 |
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US09/402,078 A-371-Of-International US6461916B1 (en) | 1997-03-28 | 1998-02-20 | Non-volatile semiconductor memory and method of making same, and semiconductor device and method of making the device |
US10/011,731 Continuation US6444554B1 (en) | 1997-03-28 | 2001-12-11 | Method of making a non-volatile memory and semiconductor device |
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WO1998044567A1 true WO1998044567A1 (fr) | 1998-10-08 |
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PCT/JP1998/000710 WO1998044567A1 (fr) | 1997-03-28 | 1998-02-20 | Dispositif de memoire remanente a semi-conducteur, dispositif a semi-conducteur et procedes de fabrication associes de ceux-ci |
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US (10) | US6461916B1 (ja) |
JP (1) | JP4065572B2 (ja) |
KR (3) | KR100601150B1 (ja) |
TW (1) | TW427032B (ja) |
WO (1) | WO1998044567A1 (ja) |
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---|---|---|---|---|
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US6444514B1 (en) | 1999-10-06 | 2002-09-03 | Hitachi, Ltd. | Semiconductor integrated circuit device and manufacturing method thereof |
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US7179711B2 (en) | 1997-03-28 | 2007-02-20 | Renesas Technology Corp. | Non-volatile semiconductor memory and method of making same, and semiconductor device and method of making device |
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Families Citing this family (91)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6859548B2 (en) | 1996-09-25 | 2005-02-22 | Kabushiki Kaisha Toshiba | Ultrasonic picture processing method and ultrasonic picture processing apparatus |
US8421143B2 (en) | 2000-09-26 | 2013-04-16 | Kabushiki Kaisha Toshiba | Nonvolatile semiconductor memory device having element isolating region of trench type |
JP2002176114A (ja) * | 2000-09-26 | 2002-06-21 | Toshiba Corp | 半導体装置及びその製造方法 |
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JP2002184873A (ja) * | 2000-10-03 | 2002-06-28 | Sony Corp | 不揮発性半導体記憶装置及びその製造方法 |
US6617217B2 (en) * | 2000-10-10 | 2003-09-09 | Texas Instruments Incorpated | Reduction in well implant channeling and resulting latchup characteristics in shallow trench isolation by implanting wells through nitride |
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JP4053232B2 (ja) * | 2000-11-20 | 2008-02-27 | 株式会社ルネサステクノロジ | 半導体集積回路装置およびその製造方法 |
DE10062245A1 (de) * | 2000-12-14 | 2002-07-04 | Infineon Technologies Ag | Nichtflüchtige Halbleiterspeicherzelle sowie dazugehörige Halbleiterschaltungsanordnung und Verfahren zu deren Herstellung |
WO2002091384A1 (en) * | 2001-05-07 | 2002-11-14 | Advanced Micro Devices, Inc. | A memory device with a self-assembled polymer film and method of making the same |
WO2002091385A1 (en) * | 2001-05-07 | 2002-11-14 | Advanced Micro Devices, Inc. | Molecular memory cell |
JP4731794B2 (ja) * | 2001-05-07 | 2011-07-27 | アドバンスト・マイクロ・ディバイシズ・インコーポレイテッド | メモリ効果を有するスイッチ素子及び該素子をスイッチングさせる方法 |
WO2002091495A2 (en) * | 2001-05-07 | 2002-11-14 | Coatue Corporation | Molecular memory device |
AU2002340795A1 (en) * | 2001-05-07 | 2002-11-18 | Advanced Micro Devices, Inc. | Reversible field-programmable electric interconnects |
US6627944B2 (en) | 2001-05-07 | 2003-09-30 | Advanced Micro Devices, Inc. | Floating gate memory device using composite molecular material |
JP4948715B2 (ja) * | 2001-06-29 | 2012-06-06 | 富士通セミコンダクター株式会社 | 半導体ウエハ装置およびその製造方法 |
US6806526B2 (en) | 2001-08-13 | 2004-10-19 | Advanced Micro Devices, Inc. | Memory device |
US6858481B2 (en) | 2001-08-13 | 2005-02-22 | Advanced Micro Devices, Inc. | Memory device with active and passive layers |
US6768157B2 (en) | 2001-08-13 | 2004-07-27 | Advanced Micro Devices, Inc. | Memory device |
US6838720B2 (en) * | 2001-08-13 | 2005-01-04 | Advanced Micro Devices, Inc. | Memory device with active passive layers |
CN100419906C (zh) | 2001-08-13 | 2008-09-17 | 先进微装置公司 | 存储器单元 |
KR100437466B1 (ko) * | 2001-12-27 | 2004-06-23 | 삼성전자주식회사 | 비휘발성 메모리소자 및 그 제조방법 |
KR100433407B1 (ko) * | 2002-02-06 | 2004-05-31 | 삼성광주전자 주식회사 | 업라이트형 진공청소기 |
JP2003249575A (ja) * | 2002-02-22 | 2003-09-05 | Seiko Epson Corp | 不揮発性記憶装置の製造方法 |
US6579761B1 (en) * | 2002-08-20 | 2003-06-17 | Taiwan Semiconductor Manufacturing Company | Method to improve the coupling ratio of top gate to floating gate in flash |
JP4340040B2 (ja) * | 2002-03-28 | 2009-10-07 | 富士通マイクロエレクトロニクス株式会社 | 半導体装置の製造方法 |
US6759298B2 (en) * | 2002-06-24 | 2004-07-06 | Micron Technology, Inc. | Methods of forming an array of flash field effect transistors and circuitry peripheral to such array |
TWI252565B (en) * | 2002-06-24 | 2006-04-01 | Hitachi Ltd | Semiconductor device and manufacturing method thereof |
US6613657B1 (en) * | 2002-08-30 | 2003-09-02 | Advanced Micro Devices, Inc. | BPSG, SA-CVD liner/P-HDP gap fill |
JP2004095886A (ja) * | 2002-08-30 | 2004-03-25 | Fujitsu Ltd | 半導体装置及びその製造方法 |
US7012276B2 (en) * | 2002-09-17 | 2006-03-14 | Advanced Micro Devices, Inc. | Organic thin film Zener diodes |
TW578271B (en) * | 2002-12-18 | 2004-03-01 | Ememory Technology Inc | Fabrication method for flash memory having single poly and two same channel type transistors |
US7151292B1 (en) * | 2003-01-15 | 2006-12-19 | Spansion Llc | Dielectric memory cell structure with counter doped channel region |
JP4472633B2 (ja) * | 2003-06-10 | 2010-06-02 | 富士通マイクロエレクトロニクス株式会社 | 半導体集積回路装置および半導体集積回路装置の製造方法 |
US6955967B2 (en) * | 2003-06-27 | 2005-10-18 | Freescale Semiconductor, Inc. | Non-volatile memory having a reference transistor and method for forming |
KR100500456B1 (ko) * | 2003-08-13 | 2005-07-18 | 삼성전자주식회사 | 플래쉬 메모리 소자의 제조방법 및 그에 의해 제조된플래쉬 메모리 소자 |
JP2005116891A (ja) * | 2003-10-09 | 2005-04-28 | Sanyo Electric Co Ltd | 半導体装置及びその製造方法 |
US6821872B1 (en) * | 2004-06-02 | 2004-11-23 | Nanya Technology Corp. | Method of making a bit line contact device |
JP2006054283A (ja) * | 2004-08-11 | 2006-02-23 | Nec Electronics Corp | 不揮発性半導体記憶装置,及びその製造方法 |
JP2006222203A (ja) * | 2005-02-09 | 2006-08-24 | Renesas Technology Corp | 半導体装置およびその製造方法 |
JP4558557B2 (ja) * | 2005-03-31 | 2010-10-06 | 富士通セミコンダクター株式会社 | 不揮発性半導体記憶装置 |
JPWO2006129367A1 (ja) * | 2005-06-02 | 2008-12-25 | 有限会社 みすゞR&D | 不揮発性メモリ |
KR100717280B1 (ko) * | 2005-08-22 | 2007-05-15 | 삼성전자주식회사 | 반도체 기억 장치의 셀 어레이 및 그 형성 방법 |
US20070085129A1 (en) * | 2005-10-14 | 2007-04-19 | Macronix International Co., Ltd. | Nitride read only memory device with buried diffusion spacers and method for making the same |
US20070093014A1 (en) * | 2005-10-26 | 2007-04-26 | Promos Technologies Inc. | Method for preventing doped boron in a dielectric layer from diffusing into a substrate |
JP5085859B2 (ja) * | 2005-10-28 | 2012-11-28 | 株式会社ジャパンディスプレイイースト | 画像表示装置及びその製造方法 |
US7642579B2 (en) * | 2006-03-06 | 2010-01-05 | Stmicroelectronics S.A. | Image sensor comprising pixels with one transistor |
US7535060B2 (en) * | 2006-03-08 | 2009-05-19 | Freescale Semiconductor, Inc. | Charge storage structure formation in transistor with vertical channel region |
JP4901325B2 (ja) * | 2006-06-22 | 2012-03-21 | ルネサスエレクトロニクス株式会社 | 半導体装置 |
JP4909735B2 (ja) * | 2006-06-27 | 2012-04-04 | 株式会社東芝 | 不揮発性半導体メモリ |
KR100843055B1 (ko) * | 2006-08-17 | 2008-07-01 | 주식회사 하이닉스반도체 | 플래쉬 메모리 소자 및 그의 제조방법 |
US20080081424A1 (en) * | 2006-09-29 | 2008-04-03 | Josef Willer | Method of production of a semiconductor memory device and semiconductor memory device |
KR100803167B1 (ko) * | 2006-10-10 | 2008-02-14 | 고려대학교 산학협력단 | 나노 입자를 이용한 나노 부유 게이트 메모리 소자 및 그제조 방법 |
KR100880338B1 (ko) * | 2006-12-04 | 2009-01-28 | 주식회사 하이닉스반도체 | 플래시 메모리 소자의 제조방법 |
KR100842470B1 (ko) * | 2006-12-28 | 2008-07-01 | 동부일렉트로닉스 주식회사 | 반도체 소자의 캐패시턴스 제조 방법 |
KR100827666B1 (ko) * | 2007-05-08 | 2008-05-07 | 삼성전자주식회사 | 반도체 장치들 및 그의 형성방법들 |
KR100866261B1 (ko) * | 2007-06-28 | 2008-10-31 | 재단법인서울대학교산학협력재단 | 함몰된 채널에 분리 게이트를 갖는 플래시 메모리 소자와이를 이용한 플래시 메모리 어레이 및 그 제조방법 |
JP5266672B2 (ja) * | 2007-06-28 | 2013-08-21 | 富士通セミコンダクター株式会社 | 半導体装置の製造方法 |
US7910976B2 (en) * | 2007-06-28 | 2011-03-22 | Richard Fastow | High density NOR flash array architecture |
JP5581215B2 (ja) * | 2007-11-01 | 2014-08-27 | インヴェンサス・コーポレイション | 不揮発性ワンタイムプログラマブル及びマルチタイムプログラマブルメモリに組み込まれた集積回路 |
US7787295B2 (en) * | 2007-11-14 | 2010-08-31 | Jonker Llc | Integrated circuit embedded with non-volatile multiple-time programmable memory having variable coupling |
US8580622B2 (en) * | 2007-11-14 | 2013-11-12 | Invensas Corporation | Method of making integrated circuit embedded with non-volatile programmable memory having variable coupling |
US7876615B2 (en) * | 2007-11-14 | 2011-01-25 | Jonker Llc | Method of operating integrated circuit embedded with non-volatile programmable memory having variable coupling related application data |
JP2009135334A (ja) * | 2007-11-30 | 2009-06-18 | Toshiba Corp | 半導体記憶装置およびその製造方法 |
KR101406888B1 (ko) * | 2007-12-13 | 2014-06-30 | 삼성전자주식회사 | 반도체 소자의 제조 방법 |
KR101353346B1 (ko) * | 2008-01-21 | 2014-02-17 | 삼성전자주식회사 | 주변 회로 영역의 불순물 영역들에 대한 열적 부담을완화시키는 반도체 소자의 제조 방법 |
US20090218638A1 (en) * | 2008-02-29 | 2009-09-03 | Smith Michael A | Nand flash peripheral circuitry field plate |
KR101463580B1 (ko) * | 2008-06-03 | 2014-11-21 | 삼성전자주식회사 | 반도체 장치 및 그 제조 방법 |
US8305805B2 (en) * | 2008-11-03 | 2012-11-06 | Invensas Corporation | Common drain non-volatile multiple-time programmable memory |
US8203861B2 (en) * | 2008-12-30 | 2012-06-19 | Invensas Corporation | Non-volatile one-time—programmable and multiple-time programmable memory configuration circuit |
JP2011009625A (ja) | 2009-06-29 | 2011-01-13 | Elpida Memory Inc | 半導体装置の製造方法 |
KR101524819B1 (ko) * | 2009-07-06 | 2015-06-02 | 삼성전자주식회사 | 비휘발성 메모리 장치 |
JP2011096889A (ja) * | 2009-10-30 | 2011-05-12 | Elpida Memory Inc | 半導体装置 |
JP5621381B2 (ja) * | 2010-07-28 | 2014-11-12 | 富士通セミコンダクター株式会社 | 半導体装置及びその製造方法 |
US8728949B2 (en) * | 2010-08-09 | 2014-05-20 | United Microelectronics Corp. | Method for fabricating a semiconductor device |
KR101797964B1 (ko) * | 2010-10-01 | 2017-11-15 | 삼성전자주식회사 | 반도체 장치의 제조 방법 및 그 방법으로 제조된 반도체 장치 |
US8765491B2 (en) | 2010-10-28 | 2014-07-01 | International Business Machines Corporation | Shallow trench isolation recess repair using spacer formation process |
US8822287B2 (en) * | 2010-12-10 | 2014-09-02 | Samsung Electronics Co., Ltd. | Methods of manufacturing semiconductor devices |
US8652907B2 (en) * | 2011-03-24 | 2014-02-18 | Spansion Llc | Integrating transistors with different poly-silicon heights on the same die |
KR101813513B1 (ko) | 2011-11-30 | 2018-01-02 | 삼성전자주식회사 | 반도체 소자 및 반도체 소자의 제조 방법 |
US8847319B2 (en) | 2012-03-09 | 2014-09-30 | Taiwan Semiconductor Manufacturing Company, Ltd. | Dummy structure for multiple gate dielectric interface and methods |
US9362272B2 (en) | 2012-11-01 | 2016-06-07 | Taiwan Semiconductor Manufacturing Company, Ltd. | Lateral MOSFET |
US9184058B2 (en) * | 2013-12-23 | 2015-11-10 | Micron Technology, Inc. | Methods of forming patterns by using a brush layer and masks |
KR20160094117A (ko) | 2015-01-30 | 2016-08-09 | 에스케이하이닉스 주식회사 | 플래시 메모리 소자 |
CN107039447B (zh) * | 2016-02-03 | 2019-09-27 | 中芯国际集成电路制造(上海)有限公司 | 存储单元及其形成方法 |
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JP2019192664A (ja) * | 2018-04-18 | 2019-10-31 | 株式会社日立製作所 | 半導体装置およびその製造方法 |
US11139306B2 (en) * | 2019-05-28 | 2021-10-05 | Winbond Electronics Corp. | Memory device and method for fabricating the same |
CN110752427B (zh) * | 2019-10-15 | 2021-07-06 | 电子科技大学 | 一种基片集成波导的毫米波衰减器 |
WO2022269737A1 (ja) * | 2021-06-22 | 2022-12-29 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッド | 半導体素子を用いたメモリ装置 |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6252971A (ja) * | 1985-08-30 | 1987-03-07 | Mitsubishi Electric Corp | 不揮発性半導体記憶装置 |
JPH0225069A (ja) * | 1988-07-13 | 1990-01-26 | Mitsubishi Electric Corp | 半導体装置およびその製造方法 |
JPH0272672A (ja) * | 1988-09-07 | 1990-03-12 | Fujitsu Ltd | 半導体装置およびその製造方法 |
JPH04229655A (ja) * | 1990-06-26 | 1992-08-19 | Mitsubishi Electric Corp | 不揮発性半導体記憶装置における消去方式 |
JPH07142618A (ja) * | 1993-11-17 | 1995-06-02 | Nec Corp | 半導体記憶装置及びその製造方法 |
JPH07147389A (ja) * | 1993-11-24 | 1995-06-06 | Hitachi Ltd | 半導体集積回路装置およびその製造方法 |
JPH07201189A (ja) * | 1993-12-28 | 1995-08-04 | Nippon Steel Corp | 半導体記憶装置の読み出し方法 |
JPH0851108A (ja) * | 1994-05-31 | 1996-02-20 | Kawasaki Steel Corp | 半導体装置およびその製造方法 |
JPH08107158A (ja) * | 1994-10-04 | 1996-04-23 | Sony Corp | 浮遊ゲート型不揮発性半導体記憶装置及びその製造方法 |
JPH08172174A (ja) * | 1994-12-20 | 1996-07-02 | Sony Corp | 不揮発性半導体記憶装置とその製造方法 |
JPH08213572A (ja) * | 1994-11-30 | 1996-08-20 | Nkk Corp | 不揮発性半導体装置およびその製造方法 |
Family Cites Families (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2714A (en) | 1842-07-11 | Hydrant | ||
JPS56120166A (en) * | 1980-02-27 | 1981-09-21 | Hitachi Ltd | Semiconductor ic device and manufacture thereof |
JP2618946B2 (ja) | 1987-12-28 | 1997-06-11 | 株式会社東芝 | 不揮発性半導体メモリ装置の製造方法 |
JPH0727974B2 (ja) * | 1988-04-26 | 1995-03-29 | 三菱電機株式会社 | 半導体記憶装置の製造方法 |
JPH02173651A (ja) | 1988-12-27 | 1990-07-05 | Fuji Photo Film Co Ltd | 静電記録フイルム |
JP2825585B2 (ja) * | 1990-01-29 | 1998-11-18 | 株式会社日立製作所 | 半導体集積回路装置及びその製造方法 |
US5032881A (en) * | 1990-06-29 | 1991-07-16 | National Semiconductor Corporation | Asymmetric virtual ground EPROM cell and fabrication method |
JP3036008B2 (ja) * | 1990-07-18 | 2000-04-24 | 日本電気株式会社 | 半導体記憶装置 |
US5306940A (en) * | 1990-10-22 | 1994-04-26 | Nec Corporation | Semiconductor device including a locos type field oxide film and a U trench penetrating the locos film |
JPH0547918A (ja) | 1991-08-13 | 1993-02-26 | Hitachi Ltd | 半導体装置の製造方法 |
US5229316A (en) * | 1992-04-16 | 1993-07-20 | Micron Technology, Inc. | Semiconductor processing method for forming substrate isolation trenches |
JP3431198B2 (ja) * | 1993-02-26 | 2003-07-28 | 株式会社東芝 | 半導体記憶装置およびその製造方法 |
JP2536413B2 (ja) * | 1993-06-28 | 1996-09-18 | 日本電気株式会社 | 半導体集積回路装置の製造方法 |
US6281103B1 (en) * | 1993-07-27 | 2001-08-28 | Micron Technology, Inc. | Method for fabricating gate semiconductor |
US5316965A (en) * | 1993-07-29 | 1994-05-31 | Digital Equipment Corporation | Method of decreasing the field oxide etch rate in isolation technology |
US5756385A (en) * | 1994-03-30 | 1998-05-26 | Sandisk Corporation | Dense flash EEPROM cell array and peripheral supporting circuits formed in deposited field oxide with the use of spacers |
TW318961B (ja) | 1994-05-04 | 1997-11-01 | Nippon Precision Circuits | |
JP3508209B2 (ja) | 1994-05-13 | 2004-03-22 | 株式会社安川電機 | 永久磁石形回転子の製造方法 |
US5740105A (en) * | 1994-05-27 | 1998-04-14 | Texas Instruments Incorporated | Memory cell array with LOCOS free isolation |
JPH0817948A (ja) | 1994-06-30 | 1996-01-19 | Toshiba Corp | 半導体装置及びその製造方法 |
JP3469362B2 (ja) | 1994-08-31 | 2003-11-25 | 株式会社東芝 | 半導体記憶装置 |
JP3308727B2 (ja) | 1994-09-22 | 2002-07-29 | 株式会社東芝 | 半導体装置の製造方法 |
JPH08148658A (ja) | 1994-11-18 | 1996-06-07 | Mitsubishi Electric Corp | 半導体記憶装置およびその製造方法 |
KR100566463B1 (ko) | 1995-01-31 | 2006-03-31 | 가부시끼가이샤 히다치 세이사꾸쇼 | 반도체 메모리 장치 |
JPH08316348A (ja) | 1995-03-14 | 1996-11-29 | Toshiba Corp | 半導体装置およびその製造方法 |
JPH08298314A (ja) | 1995-04-27 | 1996-11-12 | Nec Yamaguchi Ltd | 不揮発性半導体記憶装置及びその製造方法 |
JPH098156A (ja) | 1995-06-19 | 1997-01-10 | Sony Corp | 不揮発性記憶素子およびその形成方法 |
JPH0964209A (ja) | 1995-08-25 | 1997-03-07 | Toshiba Corp | 半導体装置およびその製造方法 |
TW389999B (en) * | 1995-11-21 | 2000-05-11 | Toshiba Corp | Substrate having shallow trench isolation and method of manufacturing the same |
JPH09275196A (ja) * | 1996-04-03 | 1997-10-21 | Sony Corp | 半導体装置及びその製造方法 |
JPH10710A (ja) | 1996-06-14 | 1998-01-06 | Rengo Co Ltd | シングルフェーサにおけるベルトの傾き修正方法 |
JPH10112531A (ja) * | 1996-08-13 | 1998-04-28 | Hitachi Ltd | 半導体集積回路装置の製造方法 |
JP4065572B2 (ja) * | 1997-03-28 | 2008-03-26 | 株式会社ルネサステクノロジ | 半導体装置 |
US6287939B1 (en) * | 1998-12-21 | 2001-09-11 | Taiwan Semiconductor Manufacturing Company | Method for fabricating a shallow trench isolation which is not susceptible to buried contact trench formation |
US6211021B1 (en) * | 1999-07-26 | 2001-04-03 | United Microelectronics Corp. | Method for forming a borderless contact |
-
1998
- 1998-02-20 JP JP54139998A patent/JP4065572B2/ja not_active Expired - Lifetime
- 1998-02-20 KR KR1020057022937A patent/KR100601150B1/ko not_active IP Right Cessation
- 1998-02-20 KR KR1020057022936A patent/KR100669996B1/ko not_active IP Right Cessation
- 1998-02-20 US US09/402,078 patent/US6461916B1/en not_active Expired - Lifetime
- 1998-02-20 WO PCT/JP1998/000710 patent/WO1998044567A1/ja not_active Application Discontinuation
- 1998-02-20 KR KR1019997008647A patent/KR100604960B1/ko not_active IP Right Cessation
- 1998-03-05 TW TW087103216A patent/TW427032B/zh not_active IP Right Cessation
-
2001
- 2001-12-11 US US10/011,731 patent/US6444554B1/en not_active Expired - Lifetime
-
2002
- 2002-06-18 US US10/173,158 patent/US20020192887A1/en not_active Abandoned
-
2003
- 2003-02-27 US US10/374,433 patent/US20030148583A1/en not_active Abandoned
-
2004
- 2004-05-24 US US10/851,350 patent/US7195976B2/en not_active Expired - Fee Related
- 2004-09-30 US US10/954,096 patent/US7179711B2/en not_active Expired - Fee Related
- 2004-09-30 US US10/954,102 patent/US7141475B2/en not_active Expired - Fee Related
-
2005
- 2005-04-18 US US11/107,826 patent/US7528036B2/en not_active Expired - Fee Related
- 2005-11-04 US US11/266,430 patent/US7304345B2/en not_active Expired - Fee Related
-
2007
- 2007-09-27 US US11/862,928 patent/US7692234B2/en not_active Expired - Fee Related
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6252971A (ja) * | 1985-08-30 | 1987-03-07 | Mitsubishi Electric Corp | 不揮発性半導体記憶装置 |
JPH0225069A (ja) * | 1988-07-13 | 1990-01-26 | Mitsubishi Electric Corp | 半導体装置およびその製造方法 |
JPH0272672A (ja) * | 1988-09-07 | 1990-03-12 | Fujitsu Ltd | 半導体装置およびその製造方法 |
JPH04229655A (ja) * | 1990-06-26 | 1992-08-19 | Mitsubishi Electric Corp | 不揮発性半導体記憶装置における消去方式 |
JPH07142618A (ja) * | 1993-11-17 | 1995-06-02 | Nec Corp | 半導体記憶装置及びその製造方法 |
JPH07147389A (ja) * | 1993-11-24 | 1995-06-06 | Hitachi Ltd | 半導体集積回路装置およびその製造方法 |
JPH07201189A (ja) * | 1993-12-28 | 1995-08-04 | Nippon Steel Corp | 半導体記憶装置の読み出し方法 |
JPH0851108A (ja) * | 1994-05-31 | 1996-02-20 | Kawasaki Steel Corp | 半導体装置およびその製造方法 |
JPH08107158A (ja) * | 1994-10-04 | 1996-04-23 | Sony Corp | 浮遊ゲート型不揮発性半導体記憶装置及びその製造方法 |
JPH08213572A (ja) * | 1994-11-30 | 1996-08-20 | Nkk Corp | 不揮発性半導体装置およびその製造方法 |
JPH08172174A (ja) * | 1994-12-20 | 1996-07-02 | Sony Corp | 不揮発性半導体記憶装置とその製造方法 |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
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US7304345B2 (en) | 1997-03-28 | 2007-12-04 | Renesas Technology Corp. | Non-volatile semiconductor memory and method of making same, and semiconductor device and method of making device |
US7692234B2 (en) | 1997-03-28 | 2010-04-06 | Renesas Technology Corp. | Non-volatile semiconductor memory and method of making same, and semiconductor device and method of making device |
US7179711B2 (en) | 1997-03-28 | 2007-02-20 | Renesas Technology Corp. | Non-volatile semiconductor memory and method of making same, and semiconductor device and method of making device |
US7195976B2 (en) | 1997-03-28 | 2007-03-27 | Renesas Technology Corp. | Non-volatile semiconductor memory and method of making same, and semiconductor device and method of making device |
JP4896292B2 (ja) * | 1998-12-04 | 2012-03-14 | アドバンスト・マイクロ・ディバイシズ・インコーポレイテッド | Nandフラッシュ・メモリ装置の半導体製造方法 |
US6583467B2 (en) | 1999-10-06 | 2003-06-24 | Hitachi, Ltd. | Semiconductor integrated circuit device |
US6444514B1 (en) | 1999-10-06 | 2002-09-03 | Hitachi, Ltd. | Semiconductor integrated circuit device and manufacturing method thereof |
JP2010283387A (ja) * | 2000-01-26 | 2010-12-16 | Spansion Llc | フラッシュメモリ技術およびlocos/stiアイソレーションに関する、回路の窒化トンネル酸化物のための窒化バリア |
JP4730999B2 (ja) * | 2000-03-10 | 2011-07-20 | スパンション エルエルシー | 不揮発性メモリの製造方法 |
JP2001326288A (ja) * | 2000-03-10 | 2001-11-22 | Fujitsu Ltd | 不揮発性半導体メモリの製造方法およびそれにより製造される不揮発性半導体メモリ |
US7785954B2 (en) | 2000-06-09 | 2010-08-31 | Kabushiki Kaisha Toshiba | Semiconductor memory integrated circuit and its manufacturing method |
JP4500668B2 (ja) * | 2004-10-25 | 2010-07-14 | 株式会社ハイニックスセミコンダクター | フラッシュメモリ素子の製造方法 |
JP2006121023A (ja) * | 2004-10-25 | 2006-05-11 | Hynix Semiconductor Inc | フラッシュメモリ素子の製造方法 |
JP2005260253A (ja) * | 2005-04-04 | 2005-09-22 | Renesas Technology Corp | 半導体集積回路装置およびその製造方法 |
JP2007149882A (ja) * | 2005-11-25 | 2007-06-14 | Fujitsu Ltd | 半導体装置及びその製造方法 |
JP2007221084A (ja) * | 2006-01-23 | 2007-08-30 | Toshiba Corp | 不揮発性半導体記憶装置 |
JP2007123917A (ja) * | 2006-12-01 | 2007-05-17 | Renesas Technology Corp | 半導体集積回路装置の製造方法 |
US9189323B2 (en) | 2010-12-15 | 2015-11-17 | Kabushiki Kaisha Toshiba | Semiconductor storage device and method of controlling the same |
TWI472918B (zh) * | 2010-12-15 | 2015-02-11 | Toshiba Kk | 半導體儲存裝置及其控制方法 |
JP2013115055A (ja) * | 2011-11-24 | 2013-06-10 | Rohm Co Ltd | 半導体装置および半導体装置の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
KR100601150B1 (ko) | 2006-07-13 |
US20060051977A1 (en) | 2006-03-09 |
KR20010005584A (ko) | 2001-01-15 |
US20050090058A1 (en) | 2005-04-28 |
US7692234B2 (en) | 2010-04-06 |
KR100669996B1 (ko) | 2007-01-16 |
US6461916B1 (en) | 2002-10-08 |
US20030148583A1 (en) | 2003-08-07 |
US7179711B2 (en) | 2007-02-20 |
JP4065572B2 (ja) | 2008-03-26 |
US6444554B1 (en) | 2002-09-03 |
US20090230453A1 (en) | 2009-09-17 |
US20050189579A1 (en) | 2005-09-01 |
US7304345B2 (en) | 2007-12-04 |
US7195976B2 (en) | 2007-03-27 |
US20020064898A1 (en) | 2002-05-30 |
KR100604960B1 (ko) | 2006-07-26 |
US20050098823A1 (en) | 2005-05-12 |
KR20060002026A (ko) | 2006-01-06 |
US20040253788A1 (en) | 2004-12-16 |
TW427032B (en) | 2001-03-21 |
US20020192887A1 (en) | 2002-12-19 |
US7141475B2 (en) | 2006-11-28 |
KR20060002027A (ko) | 2006-01-06 |
US7528036B2 (en) | 2009-05-05 |
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