US20010024885A1 - Substrate for semiconductor device and method of manufacturing the same - Google Patents
Substrate for semiconductor device and method of manufacturing the same Download PDFInfo
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- US20010024885A1 US20010024885A1 US09/871,674 US87167401A US2001024885A1 US 20010024885 A1 US20010024885 A1 US 20010024885A1 US 87167401 A US87167401 A US 87167401A US 2001024885 A1 US2001024885 A1 US 2001024885A1
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- insulation
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- 239000000758 substrate Substances 0.000 title claims abstract description 108
- 239000004065 semiconductor Substances 0.000 title claims abstract description 63
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 238000009413 insulation Methods 0.000 claims abstract description 107
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 58
- 239000010703 silicon Substances 0.000 claims abstract description 58
- 239000013078 crystal Substances 0.000 claims abstract description 32
- 150000003377 silicon compounds Chemical class 0.000 claims abstract description 25
- 229910052751 metal Inorganic materials 0.000 claims abstract description 20
- 239000002184 metal Substances 0.000 claims abstract description 20
- 239000000126 substance Substances 0.000 claims abstract description 8
- 150000002500 ions Chemical class 0.000 claims abstract description 7
- 239000002131 composite material Substances 0.000 claims abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 26
- 229910001233 yttria-stabilized zirconia Inorganic materials 0.000 claims description 24
- 239000007789 gas Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 18
- 239000001301 oxygen Substances 0.000 claims description 18
- 229910052760 oxygen Inorganic materials 0.000 claims description 18
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 13
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 12
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 11
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 11
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 10
- 238000004544 sputter deposition Methods 0.000 claims description 8
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims description 7
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 229910052593 corundum Inorganic materials 0.000 claims description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 6
- 229910052727 yttrium Inorganic materials 0.000 claims description 4
- 229910052726 zirconium Inorganic materials 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 238000005546 reactive sputtering Methods 0.000 claims description 3
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims 1
- 229910021419 crystalline silicon Inorganic materials 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 138
- 239000010408 film Substances 0.000 description 22
- -1 for example Inorganic materials 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 229910052681 coesite Inorganic materials 0.000 description 8
- 229910052906 cristobalite Inorganic materials 0.000 description 8
- 239000000377 silicon dioxide Substances 0.000 description 8
- 229910052682 stishovite Inorganic materials 0.000 description 8
- 229910052905 tridymite Inorganic materials 0.000 description 8
- 239000010409 thin film Substances 0.000 description 7
- 239000000395 magnesium oxide Substances 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 229910000765 intermetallic Inorganic materials 0.000 description 4
- 229910044991 metal oxide Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 2
- 238000002048 anodisation reaction Methods 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000010849 ion bombardment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
- H01L21/02266—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by physical ablation of a target, e.g. sputtering, reactive sputtering, physical vapour deposition or pulsed laser deposition
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
- C23C14/3407—Cathode assembly for sputtering apparatus, e.g. Target
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B23/00—Single-crystal growth by condensing evaporated or sublimed materials
- C30B23/02—Epitaxial-layer growth
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/16—Oxides
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02172—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides
- H01L21/02175—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides characterised by the metal
- H01L21/02178—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides characterised by the metal the material containing aluminium, e.g. Al2O3
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02172—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides
- H01L21/02175—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides characterised by the metal
- H01L21/02189—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides characterised by the metal the material containing zirconium, e.g. ZrO2
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02172—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides
- H01L21/02197—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides the material having a perovskite structure, e.g. BaTiO3
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- H—ELECTRICITY
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- 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
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/314—Inorganic layers
- H01L21/316—Inorganic layers composed of oxides or glassy oxides or oxide based glass
- H01L21/31604—Deposition from a gas or vapour
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/02164—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon oxide, e.g. SiO2
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/022—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being a laminate, i.e. composed of sublayers, e.g. stacks of alternating high-k metal oxides
Definitions
- the present invention relates to a substrate for a semiconductor device, such as an SOI substrate and a substrate for an FET which has an MFS structure (metallic film/ferroelectric film/semiconductor layer structure), which is suitable for crystal growth of a semiconductor layer or a fereroelectric layer on a silicon substrate through an insulation layer, and to a method of manufacturing such a substrate. More particularly, the present invention relates to a substrate for a semiconductor device in which a crystalline insulation layer may be grown through an insulation layer which has an excellent insulation characteristic on a silicon substrate for the purpose of growing a semiconducting crystal layer, a ferroelectric crystal layer, etc., and to a method of manufacturing such a substrate.
- MFS structure metalic film/ferroelectric film/semiconductor layer structure
- the ferroelectric layer is formed on a semiconductor layer or on a surface of an electrode metal such as platinum through an insulation film.
- an oxide film is formed between the ferroelectric layer and the semiconductor layer, thereby degrading a crystal quality or morphology, or an interface state density between the ferroelectric layer and the semiconductor layer becomes large.
- the ferroelectric layer is formed on an insulation film, it is not possible to grow a ferroelectric layer which has an excellent crystal quality on the insulation film which is amorphous.
- the inventors of the present invention invented a method of epitaxially growing an YSZ thin film on a silicon substrate and presented the method to Shingaku Gihou (ED96-42, CPM96-27, May 1996).
- This method makes it possible to obtain a crystalline insulation layer on a silicon substrate and epitaxially grow a semiconductor layer or a ferroelectric layer on a surface of the YSZ.
- an YSZ thin film which is formed on a silicon substrate is a crystalline metallic oxide film and hence migrates ions, electric insulation of the YSZ thin film is inferior to that of a silicon oxide film or a silicon nitride film, and therefore, the YSZ thin film slightly degrades electric characteristics.
- an object of the present invention is to provide a substrate for a semiconductor device which is suitable to grow a crystal layer, such as a semiconductor layer and a ferroelectric layer, on other semiconductor layer through an insulation layer during fabrication of a semiconductor device and which sufficiently improves electric insulation against a silicon substrate which serves as a base.
- Other object of the present invention is to provide a method of forming a crystalline insulation layer on a semiconductor layer through an insulation silicon compound.
- a substrate for a semiconductor device comprises a crytalline silicon substrate, an insulation silicon compound layer which is formed on the silicon substrate, and a crystalline insulation layer which is epitaxially grown on the insulation silicon compound layer.
- a “substrate for a semiconductor device” refers to a base for growing crystalline semiconductor layers and ferroelectric layers one atop the other, but not a complete base for a semiconductor device.
- a “substrate for a semiconductor device” covers a structure that an insulation silicon compound layer or a ferroelectric layer is formed in a portion of a semiconductor device, or on a stacked semiconductor layer, etc.
- the crystalline insulation layer is formed by at least one species which is selected from a group of YSZ (yttria stabilized zirconia), Al 2 O 3 (sapphire), CeO 2 (ceria), MgO (magnesia) and ZrO 2 (zirconia) and the insulation silicon compound layer is formed by at least one of silicon oxide, silicon nitride and silicon nitride oxide, a substrate for a semiconductor device which is particularly excellent in insulation and crystalline characteristics is obtained.
- a method of manufacturing a substrate for a semiconductor device according to the present invention is comprising the steps of:
- the silicon substrate and the target are disposed facing each other within a reactive sputtering apparatus, the reactive gas is supplied into the apparatus in such a manner that there is a larger amount of the reactive gas around the substrate than around the target, and inert gas which is supplied into the apparatus is discharged and the crystal layer of the crystalline insulation substance is grown, whereby the substrate for a semiconductor device is obtained.
- the target may be a composite target or an alloy target of zirconium (Zr) and yttrium (Y)
- the reactive gas may be oxygen
- the crystalline insulation layer may be YSZ
- the crystalline insulation substance may be silicon oxide.
- the reactive gas may be supplied into the sputtering apparatus with the target covered with a cover which has an opening at a portion of the target which is faced with the silicon substrate.
- This simple structure allows to deposit the layer as it is in the metal mode on the substrate without chemically combining the target and to epitaxially grow a compound of the metal of the target and the reactive gas on the substrate.
- FIG. 1 is a cross sectional explanatory diagram showing a stacked structure of a substrate for a semiconductor device according to the present invention
- FIG. 2 is a schematic diagram showing an example of a sputtering apparatus for obtaining the stacked structure according to the present invention.
- FIG. 3 is a view showing an example of a target which is used in the apparatus which is shown in FIG. 2.
- an insulation silicon compound layer 2 which has an excellent electric insulation characteristic, such as a silicon oxide film, is formed between a silicon substrate 1 and a crystalline insulation layer 3 , such as YSZ, which is epitaxially grown on the silicon substrate 1 .
- the silicon substrate 1 is formed by a silicon monocrystalline layer. With respect to the conductivity of the silicon substrate 1 , the silicon substrate 1 may be an n type layer, a p type layer, a semiconductor circuit in which an n type region, a p type region and the like are formed, or a silicon semiconductor layer is formed entirely or partially on other semiconductor layer or the like.
- the crystalline insulation layer (monocrystalline insulation layer) 3 metallic compound, for example, YSZ, Al 2 O 3 , CeO 2 , MgO, ZrO 2 or any other metal oxide, which allows a crystalline structure to grow thereon is used.
- a crystalline structure of a metallic compound is obtained by growing metal on the silicon substrate 1 while oxidized, fluorinated, nitrided or otherwise chemically combined with metal on the substrate 1 .
- the thickness of the crystalline insulation layer 3 is different depending on an application. Used as a ground for growing other semiconductor layer or a crystalline ferroelectric layer, the crystalline insulation layer 3 is normally about 5 to 20 nm which is thick enough as such a ground. Depending on an application, the crystalline insulation layer 3 may be formed into a thickness of approximately 0.5 to 1 ⁇ m.
- the insulation silicon compound layer 2 silicon oxide such as SiO 2 , silicon nitride such as Si 3 N 4 , silicon nitride oxide such as SiON, or the like is used. As described later, such a compound is obtained by chemically combination of oxygen, nitrogen or the like which passes through the crystalline insulation layer 3 and silicon, during growth of the crystalline insulation layer 3 , and therefore, is limited to a compound which is obtained by chemical combination with a substance which passes through the crystalline insulation layer 3 . While determined in accordance with a breakdown voltage, etc., which is required in an expected application, the thickness of the insulation silicon compound layer 2 is normally about 10 to 60 nm.
- the monocrystalline insulation layer is formed on the silicon substrate through the amorphous insulation film.
- a surface of the semiconductor substrate has a crystalline structure, which allows to epitaxially grow a further semiconductor layer or a crystalline ferroelectric layer on the surface of the semiconductor substrate.
- the amorphous insulation film which is formed by a silicon compound is formed between the monocrystalline insulation layer and the crystalline silicon layer, the semiconductor substrate has an excellent insulation characteristic. This achieves very strong electric insulation between a layer which is formed at the surface of the crystalline insulation layer and the silicon substrate which is formed beneath.
- the monocrystalline insulation layer is a metallic compound, such as metal oxide, as described earlier, and therefore, has a slightly inferior insulation characteristic due to possible ion migration, silicon oxide, silicon nitride or the like realizes excellent electric characteristics.
- silicon oxide, silicon nitride or the like realizes excellent electric characteristics. This allows to obtain an SOI substrate, to repeatedly form semiconductor layers through insulation layers on the crystalline silicon layer in which a semiconductor circuit is formed such that a three dimensional circuit is formed, or to form a crystalline ferroelectric layer of a ferroelectric material or the like into a quality crystalline structure to thereby obtain a semiconductor memory device which has excellent characteristics.
- FIG. 2 is a schematic diagram of a reactive sputtering apparatus for epitaxial growth, showing an example of an apparatus which is used in the manufacturing method.
- a substrate 1 of a silicon semiconducting crystal layer which has a diameter of 1 inch is mounted to a substrate seater (mounting plate) 12 within a vacuum chamber 11 of the sputtering apparatus, and a target 4 is fixed to a target holder 13 which is disposed so as to face the substrate seater 12 .
- the target 4 is a composite target which is obtained by attaching about six yttrium (Y) plates 42 whose each side A is about 10 mm and thickness is about 1 mm to a Zr plate 41 whose diameter D is about 100 mm and thickness is about 5 mm in a circumferential direction, for example as shown in FIG. 3, or an alloy target which is obtained by adding Y to Zr at 8 to 10%.
- a cover 14 which has an opening 14 a which has a diameter of about 20 mm or a collimator which has an equivalent effect is disposed in front of the target 4 .
- Metal to be sputtered is passed through the opening 14 a , while avoiding exposure of the target 4 to oxygen and resulting oxidation of the target 4 .
- An electrode pole 15 is disposed in contact with the target holder 13 , and a first power source 16 is connected between the electrode pole 15 and an earth with the electrode pole 15 serving as the negative pole so that a plasma discharge is created within the vacuum chamber 11 .
- a gas introducing pipe 17 is disposed to one wall of the vacuum chamber 11 for supplying Ar and O 2 to the vacuum chamber 11 , while a gas discharging exit 18 is formed in other wall of the vacuum chamber 11 .
- a second power source 19 for attracting oxygen ions toward the substrate 1 and anodizating is provided between the substrate seater 12 and the earth with the substrate seater 12 serving as the positive pole.
- Denoted at 20 is a solenoid coil for developing a magnetic field at a surface of the target
- denoted at 21 is a solenoid coil for pressing the magnetic field against the surface of the target.
- the silicon substrate 1 was mounted to the substrate seater 12 and in such a manner that a distance from the target 4 was 72 mm, for instance.
- a positive voltage of approximately 50 V was applied from the second power source 19 to the substrate for anodization.
- an YSZ crystal layer was epitaxially grown at a rate of 40 nm/min and an SiO 2 layer was formed at a rate of about 1 nm/min between the substrate and the YSZ crystal layer.
- an applied voltage may be varied in the range of about 300 to 500 V.
- the voltage for anodization i.e., the voltage from the second power source 19
- the voltage for anodization may be varied in the range of about 20 to 100 V.
- the manufacturing method according to the present invention provide to sputter the metal which forms the crystalline insulation layer and grow the metallic compound on the substrate while reacting the metal with the reactive gas which is around the substrate and consequently forming the crystalline insulation layer of oxide or the like, and at the same time to create an insulation silicon compound on the surface of the substrate. That is, as described earlier, the inventors of the present invention disclosed, in Shingaku Gihou ED96-42, a method in which a layer is grown as it is in the metal mode without oxidizing the target and oxidized while grown, so that an YSZ thin film is epitaxially grown on a silicon substrate at a high deposition speed.
- the present invention requires to apply a voltage to a silicon substrate to thereby attract ions such as oxygen ions to the silicon substrate and chemically combine the ions with silicon while epitaxially growing a crystalline insulation layer such as an YSZ thin film, so that an insulation film (insulation silicon compound layer) which is formed by a silicon compound such as SiO 2 which has an excellent electric insulation characteristic is formed between the crystalline insulation layer such as YSZ and the crystalline silicon layer.
- the insulation film such as SiO 2 may be formed at a different time from growth of the crystalline insulation layer. So it produces a substrate for a semiconductor device which is formed by the crystalline silicon substrate, the insulation silicon compound layer which is formed on the silicon substrate, and the crystalline insulation layer which is formed on the insulation silicon compound layer.
- the crystalline insulation layer is grown as it is in the metal mode which prohibits the target from chemically combining with the atmosphere, it is easy to epitaxially grow an insulation layer which has an excellent crystal structure.
- an amorphous insulation film may be formed at the interface between the crystalline insulation layer and the silicon substrate, without degrading the crystal quality of the crystalline insulation layer.
- the target 4 is covered with the cover 14 which has the opening 14 a in the sputtering apparatus described above, this is because if the target 4 is oxidized due to oxygen of the reactive gas, the oxide is sputtered and the sputtered oxide prevents to grow a film in the metal mode, and prohibited crystal growth eventually creates an amorphous film. Therefore, as far as oxidation of the target 4 is avoided, such a cover 14 is not necessary.
- the metal is sputtered and grown epitaxially to the surface of the substrate, and at the same time, utilizing activation of the metal, the metal is oxidized by oxygen of the atmosphere so that crystals of the metal oxide grows.
- the cover 14 may be omitted so that the partial pressure of the reactive gas, such as the partial pressure of oxygen, at the target 4 becomes very low, and the reactive gas such as oxygen may be blown toward the substrate 1 so that the partial pressure of the reactive gas becomes high only at the substrate 1 .
- the YSZ crystal layer is grown using Zr and Y as the target in the example described above, a film may be grown in the metal mode with a low partial pressure of oxygen in a similar manner using Ce as the target and oxidized at the surface of the substrate to thereby grow a crystal layer of CeO 2 . Further, it is possible to grow a crystal layer of Al 2 O 3 in a similar manner when Al is used as the target, and it is possible to grow a crystal layer of MgO or ZrO 2 when Mg or Zr is used as the target. In addition, instead of using oxygen as the atmosphere at the surface of the substrate, fluorine or nitrogen may be blown toward the substrate, so that a crystalline insulation layer which is formed by a compound of metal and fluorine or nitrogen is obtained.
- oxygen ions are attracted toward the silicon substrate, and silicon is oxidized so that silicon oxide is created between the crystalline insulation layer and the silicon substrate
- nitrogen ions may be attracted and chemically combined to create silicon nitride.
- both oxygen ions and nitrogen ions may be attracted to create a silicon nitride oxide layer.
- the crystalline insulation layer is grown by sputtering in the example described above, it is possible to manufacture in a similar manner in other method such as laser absorption, reactive evaporation, etc, if the chemical combination at the target is prohibitted, and chemical combination may be caused during growth to the surface of the substrate.
- a crystalline insulation layer is formed on a crystalline silicon layer through an amorphous insulation film which is formed by a silicon compound which has an excellent insulation characteristic.
- a silicon compound which has an excellent insulation characteristic.
Abstract
Metal which forms a crystalline insulation layer is sputtered at a target and deposited as a film on a silicon substrate, the metal is chemically combined with reactive gas around the silicon substrate to thereby grow a crystal layer of a crystalline insulation substance, and a voltage is applied to the substrate so that ions of the reactive gas around the substrate are attracted to a surface of the silicon substrate and chemically combined with silicon, whereby an insulation silicon compound layer is formed. As a result, a structure is obtained in which a crystalline insulation layer is formed on a crystalline silicon layer through an amorphous insulation film which is formed by a silicon compound which has an excellent insulation characteristic. Hence, it is possible to epitaxially grow other semiconductor layer or a crystalline ferroelectric layer on a surface of the crystalline insulation layer, which makes it possible to form a three dimensional semiconductor device, a composite semiconductor device, a high performance semiconductor memory device or the like. Thus, it is possible to obtain a semiconductor device which is new and highly integrated at an inexpensive cost.
Description
- The present invention relates to a substrate for a semiconductor device, such as an SOI substrate and a substrate for an FET which has an MFS structure (metallic film/ferroelectric film/semiconductor layer structure), which is suitable for crystal growth of a semiconductor layer or a fereroelectric layer on a silicon substrate through an insulation layer, and to a method of manufacturing such a substrate. More particularly, the present invention relates to a substrate for a semiconductor device in which a crystalline insulation layer may be grown through an insulation layer which has an excellent insulation characteristic on a silicon substrate for the purpose of growing a semiconducting crystal layer, a ferroelectric crystal layer, etc., and to a method of manufacturing such a substrate.
- In relation to an SOI substrate for growing a semiconducting crystal layer on an insulation layer, for instance, among known methods are a method which requires to bond two silicon substrate seating oxide films with each other and polish one of the two substrates to thereby leave a thin semiconductor layer. And another method requires to inject oxygen or the like at a surface of a silicon substrate to a constant depth and to anneal so that an insulation layer is buried in a semiconductor substrate.
- Meanwhile, in a semiconductor memory device using a ferroelectric layer, the ferroelectric layer is formed on a semiconductor layer or on a surface of an electrode metal such as platinum through an insulation film. In an MFS structure in which a ferroelectric layer is formed on a semiconductor layer, an oxide film is formed between the ferroelectric layer and the semiconductor layer, thereby degrading a crystal quality or morphology, or an interface state density between the ferroelectric layer and the semiconductor layer becomes large. Where the ferroelectric layer is formed on an insulation film, it is not possible to grow a ferroelectric layer which has an excellent crystal quality on the insulation film which is amorphous.
- As described above, during fabrication of a semiconductor device, while it is necessary to epitaxially grow a semiconductor layer or a crystalline ferroelectric layer on a semiconductor substrate through an insulation layer in some cases, since the insulation layer is amorphous, it is not possible to grow a crystalline layer directly on a surface of the insulation layer.
- Further, in the method which requires to polish one of bonded silicon layers for thinning the one silicon layer, it is extremely difficult to polish the silicon layer into an uniformly thin layer and polishing is laborious, and therefore, a quality crystalline surface is hardly obtained. In the method which requires to inject oxygen at a surface layer portion of a semiconductor substrate, on the other hand, ion bombardment greatly degrades a surface of a semiconductor layer, and therefore, a high quality crystalline surface is hardly obtained, either. As a result, a crystal layer which is formed on such a deteriorated crystalline surface as well has a deteriorated crystal quality.
- On the other hand, the inventors of the present invention invented a method of epitaxially growing an YSZ thin film on a silicon substrate and presented the method to Shingaku Gihou (ED96-42, CPM96-27, May 1996). This method makes it possible to obtain a crystalline insulation layer on a silicon substrate and epitaxially grow a semiconductor layer or a ferroelectric layer on a surface of the YSZ. However, since an YSZ thin film which is formed on a silicon substrate is a crystalline metallic oxide film and hence migrates ions, electric insulation of the YSZ thin film is inferior to that of a silicon oxide film or a silicon nitride film, and therefore, the YSZ thin film slightly degrades electric characteristics.
- The present invention has been made to solve such problems. Accordingly, an object of the present invention is to provide a substrate for a semiconductor device which is suitable to grow a crystal layer, such as a semiconductor layer and a ferroelectric layer, on other semiconductor layer through an insulation layer during fabrication of a semiconductor device and which sufficiently improves electric insulation against a silicon substrate which serves as a base.
- Other object of the present invention is to provide a method of forming a crystalline insulation layer on a semiconductor layer through an insulation silicon compound.
- A substrate for a semiconductor device according to the present invention comprises a crytalline silicon substrate, an insulation silicon compound layer which is formed on the silicon substrate, and a crystalline insulation layer which is epitaxially grown on the insulation silicon compound layer.
- As herein termed, a “substrate for a semiconductor device” refers to a base for growing crystalline semiconductor layers and ferroelectric layers one atop the other, but not a complete base for a semiconductor device. In this context, a “substrate for a semiconductor device” covers a structure that an insulation silicon compound layer or a ferroelectric layer is formed in a portion of a semiconductor device, or on a stacked semiconductor layer, etc.
- Where the crystalline insulation layer is formed by at least one species which is selected from a group of YSZ (yttria stabilized zirconia), Al2O3 (sapphire), CeO2 (ceria), MgO (magnesia) and ZrO2 (zirconia) and the insulation silicon compound layer is formed by at least one of silicon oxide, silicon nitride and silicon nitride oxide, a substrate for a semiconductor device which is particularly excellent in insulation and crystalline characteristics is obtained.
- A method of manufacturing a substrate for a semiconductor device according to the present invention is comprising the steps of:
- growing a crystalline insulation layer on a silicon substrate by sputtering a metal which forms said crystalline insulation layer from a target, and chemically combining with reactive gas around said silicon substrate; and
- forming an insulation silicon compound layer by applying a voltage to said silicon substrate so that ions of said reactive gas around said substrate are attracted to a surface of said silicon substrate and chemically combined with silicon.
- More specifically, the silicon substrate and the target are disposed facing each other within a reactive sputtering apparatus, the reactive gas is supplied into the apparatus in such a manner that there is a larger amount of the reactive gas around the substrate than around the target, and inert gas which is supplied into the apparatus is discharged and the crystal layer of the crystalline insulation substance is grown, whereby the substrate for a semiconductor device is obtained. Even more specifically, the target may be a composite target or an alloy target of zirconium (Zr) and yttrium (Y), the reactive gas may be oxygen, the crystalline insulation layer may be YSZ, and the crystalline insulation substance may be silicon oxide.
- When Ce, Al, Mg or Zr is used as the target, it is possible to grow CeO2, Al2O3, MgO or ZrO2, respectively, as the crystalline insulation layer.
- The reactive gas may be supplied into the sputtering apparatus with the target covered with a cover which has an opening at a portion of the target which is faced with the silicon substrate. This simple structure allows to deposit the layer as it is in the metal mode on the substrate without chemically combining the target and to epitaxially grow a compound of the metal of the target and the reactive gas on the substrate.
- FIG. 1 is a cross sectional explanatory diagram showing a stacked structure of a substrate for a semiconductor device according to the present invention;
- FIG. 2 is a schematic diagram showing an example of a sputtering apparatus for obtaining the stacked structure according to the present invention; and
- FIG. 3 is a view showing an example of a target which is used in the apparatus which is shown in FIG. 2.
- As shown in FIG. 1, in a substrate for a semiconductor device according to the present invention, an insulation
silicon compound layer 2 which has an excellent electric insulation characteristic, such as a silicon oxide film, is formed between asilicon substrate 1 and acrystalline insulation layer 3, such as YSZ, which is epitaxially grown on thesilicon substrate 1. - The
silicon substrate 1 is formed by a silicon monocrystalline layer. With respect to the conductivity of thesilicon substrate 1, thesilicon substrate 1 may be an n type layer, a p type layer, a semiconductor circuit in which an n type region, a p type region and the like are formed, or a silicon semiconductor layer is formed entirely or partially on other semiconductor layer or the like. - As the crystalline insulation layer (monocrystalline insulation layer)3, metallic compound, for example, YSZ, Al2O3, CeO2, MgO, ZrO2 or any other metal oxide, which allows a crystalline structure to grow thereon is used. A crystalline structure of a metallic compound is obtained by growing metal on the
silicon substrate 1 while oxidized, fluorinated, nitrided or otherwise chemically combined with metal on thesubstrate 1. The thickness of thecrystalline insulation layer 3 is different depending on an application. Used as a ground for growing other semiconductor layer or a crystalline ferroelectric layer, thecrystalline insulation layer 3 is normally about 5 to 20 nm which is thick enough as such a ground. Depending on an application, thecrystalline insulation layer 3 may be formed into a thickness of approximately 0.5 to 1 μm. - As the insulation
silicon compound layer 2, silicon oxide such as SiO2, silicon nitride such as Si3N4, silicon nitride oxide such as SiON, or the like is used. As described later, such a compound is obtained by chemically combination of oxygen, nitrogen or the like which passes through thecrystalline insulation layer 3 and silicon, during growth of thecrystalline insulation layer 3, and therefore, is limited to a compound which is obtained by chemical combination with a substance which passes through thecrystalline insulation layer 3. While determined in accordance with a breakdown voltage, etc., which is required in an expected application, the thickness of the insulationsilicon compound layer 2 is normally about 10 to 60 nm. - In the substrate for a semiconductor device according to the present invention, the monocrystalline insulation layer is formed on the silicon substrate through the amorphous insulation film. Hence, a surface of the semiconductor substrate has a crystalline structure, which allows to epitaxially grow a further semiconductor layer or a crystalline ferroelectric layer on the surface of the semiconductor substrate. In addition, since the amorphous insulation film which is formed by a silicon compound is formed between the monocrystalline insulation layer and the crystalline silicon layer, the semiconductor substrate has an excellent insulation characteristic. This achieves very strong electric insulation between a layer which is formed at the surface of the crystalline insulation layer and the silicon substrate which is formed beneath. In short, while the monocrystalline insulation layer is a metallic compound, such as metal oxide, as described earlier, and therefore, has a slightly inferior insulation characteristic due to possible ion migration, silicon oxide, silicon nitride or the like realizes excellent electric characteristics. This allows to obtain an SOI substrate, to repeatedly form semiconductor layers through insulation layers on the crystalline silicon layer in which a semiconductor circuit is formed such that a three dimensional circuit is formed, or to form a crystalline ferroelectric layer of a ferroelectric material or the like into a quality crystalline structure to thereby obtain a semiconductor memory device which has excellent characteristics.
- Now, a method of manufacturing the substrate for a semiconductor device according to the present invention will be described in relation to a specific example in which YSZ crystals are grown on a silicon substrate through a silicon oxide film. FIG. 2 is a schematic diagram of a reactive sputtering apparatus for epitaxial growth, showing an example of an apparatus which is used in the manufacturing method.
- First, a
substrate 1 of a silicon semiconducting crystal layer which has a diameter of 1 inch is mounted to a substrate seater (mounting plate) 12 within avacuum chamber 11 of the sputtering apparatus, and atarget 4 is fixed to atarget holder 13 which is disposed so as to face thesubstrate seater 12. Thetarget 4 is a composite target which is obtained by attaching about six yttrium (Y)plates 42 whose each side A is about 10 mm and thickness is about 1 mm to aZr plate 41 whose diameter D is about 100 mm and thickness is about 5 mm in a circumferential direction, for example as shown in FIG. 3, or an alloy target which is obtained by adding Y to Zr at 8 to 10%. Around thetarget 4, acover 14 which has an opening 14 a which has a diameter of about 20 mm or a collimator which has an equivalent effect is disposed in front of thetarget 4. Metal to be sputtered is passed through the opening 14 a, while avoiding exposure of thetarget 4 to oxygen and resulting oxidation of thetarget 4. Anelectrode pole 15 is disposed in contact with thetarget holder 13, and afirst power source 16 is connected between theelectrode pole 15 and an earth with theelectrode pole 15 serving as the negative pole so that a plasma discharge is created within thevacuum chamber 11. Agas introducing pipe 17 is disposed to one wall of thevacuum chamber 11 for supplying Ar and O2 to thevacuum chamber 11, while agas discharging exit 18 is formed in other wall of thevacuum chamber 11. Further, in this apparatus, asecond power source 19 for attracting oxygen ions toward thesubstrate 1 and anodizating is provided between thesubstrate seater 12 and the earth with thesubstrate seater 12 serving as the positive pole. Denoted at 20 is a solenoid coil for developing a magnetic field at a surface of the target, and denoted at 21 is a solenoid coil for pressing the magnetic field against the surface of the target. - In such an apparatus, the
silicon substrate 1 was mounted to thesubstrate seater 12 and in such a manner that a distance from thetarget 4 was 72 mm, for instance. As gas to introduce, Ar gas was supplied at a constant gas pressure of 10 mTorr, for example, and with a flow rate to oxygen of O2 /(Ar+O2)=5.8%, for instance. While epitaxially growing YSZ at a discharge power of 80 W and a substrate temperature of 600 to 800° C., a positive voltage of approximately 50 V was applied from thesecond power source 19 to the substrate for anodization. As a result, an YSZ crystal layer was epitaxially grown at a rate of 40 nm/min and an SiO2 layer was formed at a rate of about 1 nm/min between the substrate and the YSZ crystal layer. As to a relationship between the YSZ crystal layer and the SiO2 layer in terms of thickness, the lower the applied voltage from thesecond power source 19 is, the thinner the SiO2 layer is so that the proportion of the SiO2 layer is small. Conversely, the higher the voltage from thesecond power source 19 is, the larger the proportion of the SiO2 layer is. Further, the higher the discharge power (which is the voltage from the first power source 16) is, the thicker the YSZ crystal layer is and the larger the proportion of the YSZ crystal layer is. Conversely, the lower the discharge power is, the smaller the proportion of the YSZ crystal layer is. With respect to the discharge power, an applied voltage may be varied in the range of about 300 to 500 V. Meanwhile, the voltage for anodization (i.e., the voltage from the second power source 19) may be varied in the range of about 20 to 100 V. Hence, it is possible to grow each layer into a desired thickness. - As described above, the manufacturing method according to the present invention provide to sputter the metal which forms the crystalline insulation layer and grow the metallic compound on the substrate while reacting the metal with the reactive gas which is around the substrate and consequently forming the crystalline insulation layer of oxide or the like, and at the same time to create an insulation silicon compound on the surface of the substrate. That is, as described earlier, the inventors of the present invention disclosed, in Shingaku Gihou ED96-42, a method in which a layer is grown as it is in the metal mode without oxidizing the target and oxidized while grown, so that an YSZ thin film is epitaxially grown on a silicon substrate at a high deposition speed. Utilizing the nature of a crystalline insulation layer such as an YSZ thin film that the crystalline insulation layer transmits oxygen ions and the like, the present invention requires to apply a voltage to a silicon substrate to thereby attract ions such as oxygen ions to the silicon substrate and chemically combine the ions with silicon while epitaxially growing a crystalline insulation layer such as an YSZ thin film, so that an insulation film (insulation silicon compound layer) which is formed by a silicon compound such as SiO2 which has an excellent electric insulation characteristic is formed between the crystalline insulation layer such as YSZ and the crystalline silicon layer. In this case, the insulation film such as SiO2 may be formed at a different time from growth of the crystalline insulation layer. So it produces a substrate for a semiconductor device which is formed by the crystalline silicon substrate, the insulation silicon compound layer which is formed on the silicon substrate, and the crystalline insulation layer which is formed on the insulation silicon compound layer.
- In the manufacturing method according to the present invention, since the crystalline insulation layer is grown as it is in the metal mode which prohibits the target from chemically combining with the atmosphere, it is easy to epitaxially grow an insulation layer which has an excellent crystal structure. Further, to form the insulation film of a silicon compound on the silicon surface under the condition in which the crystalline insulation layer is provided on the silicon substrate, an amorphous insulation film may be formed at the interface between the crystalline insulation layer and the silicon substrate, without degrading the crystal quality of the crystalline insulation layer. In addition, as it is possible to form the crystalline insulation layer and the silicon compound approximately at the same time, it is possible to form the substrate for a semiconductor device in a short period of time.
- While the
target 4 is covered with thecover 14 which has the opening 14 a in the sputtering apparatus described above, this is because if thetarget 4 is oxidized due to oxygen of the reactive gas, the oxide is sputtered and the sputtered oxide prevents to grow a film in the metal mode, and prohibited crystal growth eventually creates an amorphous film. Therefore, as far as oxidation of thetarget 4 is avoided, such acover 14 is not necessary. In other words, in the example described above, the metal is sputtered and grown epitaxially to the surface of the substrate, and at the same time, utilizing activation of the metal, the metal is oxidized by oxygen of the atmosphere so that crystals of the metal oxide grows. Hence, thecover 14 may be omitted so that the partial pressure of the reactive gas, such as the partial pressure of oxygen, at thetarget 4 becomes very low, and the reactive gas such as oxygen may be blown toward thesubstrate 1 so that the partial pressure of the reactive gas becomes high only at thesubstrate 1. - Although the YSZ crystal layer is grown using Zr and Y as the target in the example described above, a film may be grown in the metal mode with a low partial pressure of oxygen in a similar manner using Ce as the target and oxidized at the surface of the substrate to thereby grow a crystal layer of CeO2. Further, it is possible to grow a crystal layer of Al2O3 in a similar manner when Al is used as the target, and it is possible to grow a crystal layer of MgO or ZrO2 when Mg or Zr is used as the target. In addition, instead of using oxygen as the atmosphere at the surface of the substrate, fluorine or nitrogen may be blown toward the substrate, so that a crystalline insulation layer which is formed by a compound of metal and fluorine or nitrogen is obtained.
- Further, while the example described above requires that oxygen ions are attracted toward the silicon substrate, and silicon is oxidized so that silicon oxide is created between the crystalline insulation layer and the silicon substrate, nitrogen ions may be attracted and chemically combined to create silicon nitride. Alternatively, both oxygen ions and nitrogen ions may be attracted to create a silicon nitride oxide layer.
- Further, although the crystalline insulation layer is grown by sputtering in the example described above, it is possible to manufacture in a similar manner in other method such as laser absorption, reactive evaporation, etc, if the chemical combination at the target is prohibitted, and chemical combination may be caused during growth to the surface of the substrate.
- According to the present invention, it is possible to obtain a structure in which a crystalline insulation layer is formed on a crystalline silicon layer through an amorphous insulation film which is formed by a silicon compound which has an excellent insulation characteristic. Hence, it is possible to epitaxially grow other semiconductor layer or a crystalline ferroelectric layer on a surface of the crystalline insulation layer, which makes it possible to form a three dimensional semiconductor device, a composite semiconductor device, a high performance semiconductor memory device or the like. Thus, it is possible to obtain a semiconductor device which is new and highly integrated at an inexpensive cost.
- Although preferred embodiments have been described in some detail, it is to be understood that certain changes can be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. A substrate for a semiconductor device, comprising:
a crytalline silicon substrate;
an insulation silicon compound layer which is formed on said silicon substrate; and
a crystalline insulation layer which is epitaxially grown on said insulation silicon compound layer.
2. The substrate of , wherein said crystalline insulation layer is formed by at least one species which is selected from a group of YSZ, Al2O3, CeO2, MgO and ZrO2.
claim 1
3. The substrate of , wherein said insulation silicon compound layer is formed by at least one of silicon oxide, silicon nitride and silicon nitride oxide.
claim 1
4. A method of manufacturing a semiconductor substrate for a semiconductor device comprising the steps of:
growing a crystalline insulation layer on a silicon substrate by sputtering a metal which forms said crystalline insulation layer from a target, and chemically combining with reactive gas around said silicon substrate; and
forming an insulation silicon compound layer by applying a voltage to said silicon substrate so that ions of said reactive gas around said substrate are attracted to a surface of said silicon substrate and chemically combined with silicon.
5. The method of , wherein said silicon substrate and said target are disposed facing each other within a reactive sputtering apparatus, said reactive gas is supplied into said apparatus in such a manner that there is a larger amount of said reactive gas around said substrate than around said target, and inert gas which is supplied into said apparatus is discharged, whereby said crystal layer of said crystalline insulation substance is grown.
claim 4
6. The method of , wherein said target is a composite target or an alloy target of zirconium and yttrium, said reactive gas is oxygen, said crystalline insulation layer is YSZ, and said insulation silicon compound layer is silicon oxide.
claim 5
7. The method of , wherein Ce is used as said target, and a crystal layer of CeO2 is grown as said crystalline insulation layer.
claim 5
8. The method of , wherein Al is used as said-target, and a crystal layer of Al2O3 is grown as said crystalline insulation layer.
claim 5
9. The method of , wherein Mg is used as said target, and a crystal layer of MgO is grown as said crystalline insulation layer.
claim 5
10. The method of , wherein Zr is used as said target, and a crystal layer of ZrO2 is grown as said crystalline insulation layer.
claim 5
11. The method of , wherein said reactive gas is supplied into said sputtering apparatus, with said target covered with a cover which has an opening at a portion of said target which is faced with said silicon substrate.
claim 4
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1997
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1999
- 1999-09-15 US US09/395,983 patent/US6232242B1/en not_active Expired - Fee Related
-
2001
- 2001-06-04 US US09/871,674 patent/US20010024885A1/en not_active Abandoned
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2002
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US7342276B2 (en) * | 2001-10-17 | 2008-03-11 | Freescale Semiconductor, Inc. | Method and apparatus utilizing monocrystalline insulator |
Also Published As
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JPH10265948A (en) | 1998-10-06 |
US6683012B2 (en) | 2004-01-27 |
US20020177328A1 (en) | 2002-11-28 |
US6232242B1 (en) | 2001-05-15 |
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