US20060138405A1 - Thin film transistor, flat panel display including the thin film transistor, and method for manufacturing the thin film transistor and the flat panel display - Google Patents
Thin film transistor, flat panel display including the thin film transistor, and method for manufacturing the thin film transistor and the flat panel display Download PDFInfo
- Publication number
- US20060138405A1 US20060138405A1 US11/298,211 US29821105A US2006138405A1 US 20060138405 A1 US20060138405 A1 US 20060138405A1 US 29821105 A US29821105 A US 29821105A US 2006138405 A1 US2006138405 A1 US 2006138405A1
- Authority
- US
- United States
- Prior art keywords
- derivatives
- semiconductor layer
- organic semiconductor
- thin film
- region
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/20—Changing the shape of the active layer in the devices, e.g. patterning
- H10K71/211—Changing the shape of the active layer in the devices, e.g. patterning by selective transformation of an existing layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having a potential-jump barrier or a surface barrier
- H10K10/40—Organic transistors
- H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
- H10K10/462—Insulated gate field-effect transistors [IGFETs]
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/10—Organic polymers or oligomers
- H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
- H10K85/113—Heteroaromatic compounds comprising sulfur or selene, e.g. polythiophene
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
Definitions
- the present embodiments relate to a thin film transistor (TFT), a flat panel display having the TFT and a method for manufacturing the TFT and the flat panel display; and more particularly, to a thin film transistor (TFT) having a transformed region in an organic semiconductor layer that provides the same result as patterning the organic semiconductor layer, a flat panel display having the TFT and a method for manufacturing the TFT and the flat panel display.
- TFT thin film transistor
- TFT thin film transistor
- a thin film transistor has been used in a flat panel display as a switching element for controlling operations of each pixel or as a driving element for operating a pixel.
- the TFT includes a liquid crystal display element, an organic electroluminescent display element and an inorganic light emitting display element.
- the TFT includes an active layer having a source region and a drain region which are doped with a high concentration of impurity and a channel region formed between the source region and the drain region.
- the TFT also includes a gate electrode formed on a predetermined region of a substrate where the channel region is faced and the gate electrode is insulated from the active layer.
- the TFT further includes a source electrode coupled to the source region and a drain electrode, each coupled to the drain region.
- the flat panel display has become thinner and has been required to have flexibility.
- a plastic substrate has been used as a substrate of the flat panel display instead of a glass substrate.
- a high temperature thermal process cannot be performed in manufacturing the flat panel display. Accordingly, there are difficulties in using a conventional polysilicon thin film transistor for manufacturing the flat panel display.
- the organic semiconductor can be formed in a low temperature thermal process for manufacturing a thin film transistor (TFT) which is relatively inexpensive.
- a photo lithographing method cannot be used for patterning the organic semiconductor layer.
- the pattern is formed on the organic semiconductor forming an active channel. If a combination method of a wet type and a dry type of etching methods is used for forming the pattern on the organic semiconductor, the organic semiconductor is damaged.
- One embodiment relates to a thin film transistor, comprising:
- the crystal size of the transformed region is smaller than the crystal size of the other regions.
- the transformed region has lower current mobility than the other regions.
- the transformed region is formed by emitting light on a predetermined region where the transformed region is formed.
- the transformed region is formed by performing a thermal process on a predetermined region where the transformed region is formed.
- the transformed region comprises a boundary having a closed curve shape surrounding at least the channel region.
- the transformed region comprises a boundary formed on at least one pair of substantially parallel lines where at least the channel region is located between the substantially parallel lines.
- the transformed region comprises a boundary substantially parallel to a line connecting the source region, the channel region and the drain region.
- an insulation layer is formed covering the gate electrode, and the organic semiconductor layer is formed on the insulation layer.
- Another embodiment relates to an insulation layer covering the gate electrode; wherein, the source electrode and drain electrode are each formed on the insulation layer;
- the source electrode and drain electrode are each formed on a substrate and the organic semiconductor layer is formed on the substrate so as to cover the source electrode and drain electrode.
- the organic semiconductor layer is formed on a substrate, and the source electrode and the drain electrode are each formed on the organic semiconductor layer.
- the organic semiconductor layer comprises at least one of pentacene, tetracene, anthracene, naphthalene, alpha-6-thiophene, alpha-4-thiophene, perylene and its derivatives, rubrene and its derivatives, coronene and its derivatives, perylene tetracarboxylic diimide and its derivatives, perylene tetracarboxylic dianhydride and its derivates, oligonaphthalene and its derivatives, oligothiophene of alpha-5-thiophene and its derivatives, phthalocyanine including metal and its derivates, phthalocyanine not including metal and its derivates, naphthalene tetracarboxylic diimide and its derivatives, naphthalene tetracarboxylic dianhydride and its derivatives, pyromellitic dianhydride and its derivatives, pyromellitic diimide and its derivatives, p
- Another embodiment relates to a flat panel display, comprising:
- the crystal size of the transformed region is smaller than a crystal size of the other regions.
- the transformed region has lower current mobility than the other regions.
- the transformed region is formed by irradiating a predetermined region with light where the transformed region is formed.
- the transformed region is formed by performing a thermal process on a predetermined region where the transformed region is to be formed.
- the transformed region comprises a boundary having a closed curve shape surrounding at least the channel region.
- the transformed region comprises a boundary formed on at least one pair of substantially parallel lines wherein at least the channel region is located between the substantially parallel lines.
- the transformed region comprises a boundary substantially parallel to a line connecting to the source region, the channel region and the drain region.
- an insulation layer is formed for covering the gate electrode and the organic semiconductor layer is formed on the insulation layer.
- Another embodiment relates to an insulation layer covering the gate electrode; wherein, the source electrode and drain electrode are each formed on the insulation layer;
- the source electrode and drain electrode are each formed on a substrate and the organic semiconductor layer is formed on the substrate so as to cover the source electrode and drain electrode.
- the organic semiconductor layer is formed on a substrate, and the source electrode and the drain electrode are each formed on the organic semiconductor layer.
- the organic semiconductor layer comprises at least one of pentacene, tetracene, anthracene, naphthalene, alpha-6-thiophene, alpha-4-thiophene, perylene and its derivatives, rubrene and its derivatives, coronene and its derivatives, perylene tetracarboxylic diimide and its derivatives, perylene tetracarboxylic dianhydride and its derivates, oligonaphthalene and its derivatives, oligothiophene of alpha-5-thiophene and its derivatives, phthalocyanine including metal and its derivates, phthalocyanine not including a metal and its derivates, naphthalene tetracarboxylic diimide and its derivatives, naphthalene tetracarboxylic dianhydride and its derivatives, pyromellitic dianhydride and its derivatives, pyromellitic diimide and
- Another embodiment relates to a method of manufacturing a thin film transistor comprising a gate electrode, a source electrode and a drain electrode, each insulated from the gate electrode; and an organic semiconductor layer insulated from the gate electrode and coupled to the source and the drain electrodes,
- the organic semiconductor layer is irradiated by a laser.
- the organic semiconductor layer is irradiated with ultraviolet light.
- the organic semiconductor layer comprises at least one of pentacene, tetracene, anthracene, naphthalene, alpha-6-thiophene, alpha-4-thiophene, perylene and its derivatives, rubrene and its derivatives, coronene and its derivatives, perylene tetracarboxylic diimide and its derivatives, perylene tetracarboxylic dianhydride and its derivates, oligonaphthalene and its derivatives, oligothiophene of alpha-5-thiophene and its derivatives, phthalocyanine including a metal and its derivates, phthalocyanine not including a metal and its derivates, naphthalene tetracarboxylic diimide and its derivatives, naphthalene tetracarboxylic dianhydride and its derivatives, pyromellitic dianhydride and its derivatives, pyromellitic diimi
- Another embodiment relates to a method of manufacturing a thin film transistor comprising a gate electrode; a source electrode and a drain electrode, each insulated from the gate electrode; and an organic semiconductor layer insulated from the gate electrode and coupled to the source and drain electrodes,
- the organic semiconductor layer comprises at least one of pentacene, tetracene, anthracene, naphthalene, alpha-6-thiophene, alpha-4-thiophene, perylene and its derivatives, rubrene and its derivatives, coronene and its derivatives, perylene tetracarboxylic diimide and its derivatives, perylene tetracarboxylic dianhydride and its derivates, oligonaphthalene and its derivatives, oligothiophene of alpha-5-thiophene and its derivatives, phthalocyanine including a metal and its derivates, phthalocyanine not including a metal or not and its derivates, naphthalene tetracarboxylic diimide and its derivatives, naphthalene tetracarboxylic dianhydride and its derivatives, pyromellitic dianhydride and its derivatives, pyromellitic di
- Another embodiment relates to a method of manufacturing a flat panel display, comprising:
- the organic semiconductor layer is irradiated with a laser.
- the organic semiconductor layer is irradiated with ultraviolet light.
- the organic semiconductor layer comprises at least one of pentacene, tetracene, anthracene, naphthalene, alpha-6-thiophene, alpha-4-thiophene, perylene and its derivatives, rubrene and its derivatives, coronene and its derivatives, perylene tetracarboxylic diimide and its derivatives, perylene tetracarboxylic dianhydride and its derivates, oligonaphthalene and its derivatives, oligothiophene of alpha-5-thiophene and its derivatives, phthalocyanine including a metal and its derivates, phthalocyanine not including metal and its derivates, naphthalene tetracarboxylic diimide and its derivatives, naphthalene tetracarboxylic dianhydride and its derivatives, pyromellitic dianhydride and its derivatives, pyromellitic diimide and
- Another embodiment relates to a method of manufacturing a flat panel display, comprising:
- the organic semiconductor layer comprises at least one of pentacene, tetracene, anthracene, naphthalene, alpha-6-thiophene, alpha-4-thiophene, perylene and its derivatives, rubrene and its derivatives, coronene and its derivatives, perylene tetracarboxylic diimide and its derivatives, perylene tetracarboxylic dianhydride and its derivates, oligonaphthalene and its derivatives, oligothiophene of alpha-5-thiophene and its derivatives, phthalocyanine including metal and its derivates, phthalocyanine not including metal and its derivates.
- naphthalene tetracarboxylic diimide and its derivatives naphthalene tetracarboxylic diimide and its derivatives
- naphthalene tetracarboxylic dianhydride and its derivatives naphthalene tetracarboxylic dianhydride and its derivatives
- pyromellitic dianhydride and its derivatives pyromellitic diimide and its derivatives
- conjugate polymer containing thiophene and its derivatives and polymer containing fluorene and its derivatives conjugate polymer containing thiophene and its derivatives and polymer containing fluorene and its derivatives.
- FIG. 1 is a cross sectional view of a thin film transistor in accordance with one embodiment
- FIG. 2 is a cross sectional view of the thin film transistor of FIG. 1 which shows a method for manufacturing the thin film transistor in accordance with an embodiment
- FIG. 3 is a cross sectional view of the thin film transistor of FIG. 1 which shows a method for manufacturing the thin film transistor in accordance with another embodiment
- FIGS. 4 through 17 are diagrams showing various patterns of transformed region
- FIGS. 18 through 21 are cross sectional views of thin film transistors having various lamination structures in accordance with the present embodiments.
- FIG. 22 is a cross sectional view of an organic light emitting display having a thin film transistor of FIG. 1 .
- FIG. 1 is a cross sectional view of a thin film transistor (TFT) in accordance with one embodiment.
- TFT thin film transistor
- TFTs 10 and 10 ′ are formed on a substrate 11 .
- a flexible substrate may be used as the substrate 11 . That is, a plastic substrate may be used as the substrate 11 .
- the present embodiments are not limited to the use of a plastic substrate. Any flexible substrate can be used as the substrate 11 such as a predetermined thickness of flexible substrate made by a glass material or a metal material.
- the TFTs 10 and 10 ′ are formed on the substrate 11 and they are adjacent. Also, TFTs 10 and 10 ′ have substantially identical structure. Hereinafter, the structure of TFT 10 is explained.
- a gate electrode 12 having a predetermined pattern is formed on the substrate 11 and a gate insulation layer 13 is formed to cover the gate electrode 12 .
- a source electrode and a drain electrode 14 are each formed on the gate insulation layer 13 . As shown in FIG. 1 , the source electrode and the drain electrode 14 may be formed to overlap with a predetermined part of the gate electrode 12 . However, the present embodiments are not limited to having the source electrode and the drain electrode 14 overlapping with the gate electrode 12 .
- An organic semiconductor layer 15 is formed on the source electrode and the drain electrode 14 to cover the entire surface of the TFT 10 .
- the organic semiconductor layer 15 includes a source and a drain region 15 b and a channel region 15 a connecting the source and the drain regions 15 b .
- An n-type organic semiconductor or a p-type organic semiconductor may be used for the organic semiconductor layer 15 .
- an n-type impurity or a p-type impurity may be doped on the source and the drain regions 15 b.
- the organic semiconductor layer 15 is formed by using organic semiconductor material including, for example, pentacene, tetracene, anthracene, naphthalene, alpha-6-thiophene, alpha-4-thiophene, perylene and its derivatives, rubrene and its derivatives, coronene and its derivatives, perylene tetracarboxylic diimide and its derivatives, perylene tetracarboxylic dianhydride and its derivates, a oligonaphthalene and its derivatives, oligothiophene of alpha-5-thiophene and its derivatives, phthalocyanine including a metal (e.g.
- phthalocyanine not including a metal e.g. Cu, Pt, etc
- naphthalene tetracarboxylic diimide and its derivatives naphthalene tetracarboxylic dianhydride and its derivatives
- pyromellitic dianhydride and its derivatives pyromellitic diimide and its derivatives
- a conjugate polymer containing thiophene and its derivatives and a polymer containing fluorene and its derivatives.
- the organic semiconductor layer 15 is entirely evaporated on the TFTs 10 and 10 ′ to cover the entire surface of the TFT 10 and TFT 10 ′. Therefore, if patterning of the organic semiconductor layer 15 is not performed, it may generate cross-talk between TFTs 10 and 10 ′.
- a transformed region 15 c is formed between the TFTs 10 and 10 ′ in the present embodiments.
- the transformed region 15 c is a predetermined region of the organic semiconductor layer 15 which is transformed to have a crystal structure different from other regions of the organic semiconductor layer 15 .
- the transformed region 15 c is formed around at least the channel region 15 a .
- the transformed region 15 c provides the same result as patterning the organic semiconductor layer 15 .
- a predetermined region of the semiconductor layer 15 is decomposed, phase transited or photo-oxidized to form the transformed region 15 c . That is, by decomposing, phase transiting or photo-oxidizing, a crystal structure of the predetermined region becomes modified.
- the predetermined region of the organic semiconductor layer 15 is irradiated with light to modify the crystal structure of the predetermined region of the organic semiconductor layer 15 as shown in FIGS. 2 and 3 .
- FIG. 2 is a cross sectional view of a thin film transistor for demonstrating a method for forming a transformed region 15 c by irradiating a predetermined region of an organic semiconductor layer 15 with a laser
- FIG. 3 is a cross sectional view of a thin film transistor for demonstrating a method forming a transformed region 15 c by exposing a predetermined region of an organic semiconductor layer 15 to ultraviolet (UV) rays.
- UV ultraviolet
- the crystal structure of the predetermined region is changed by the heat locally generated by the laser. That is, the heat generated by the laser decomposes, photo-oxidizes or phase-transits the crystal structure of the predetermined region to be different from other regions of the organic semiconductor layer 15 (e.g. having a smaller crystal size).
- a mask 40 having a shielding portion 41 and an opening portion 42 is arranged above the TFTs 10 and 10 ′ within a predetermined space and the mask 40 is irradiated with light.
- the opening portion 42 passes the radiated UV rays to the predetermined region of the organic semiconductor layer 15 and the shielding portion 41 blocks the UV rays irradiating the organic semiconductor layer 15 .
- the predetermined region of the organic semiconductor layer 15 is exposed to the UV rays and the crystal structure of the predetermined region is changed by being decomposed, phase-transited or photo-oxidized.
- the crystal structure of the predetermined region becomes different from crystal structures of other regions of the organic semiconductor layer 15 .
- One characteristic of the transformed region 15 c formed by the above mentioned methods becomes different from the other regions of the organic semiconductor layer 15 . That is, the size of the crystal of the transformed layer 15 c becomes smaller compared to crystals of other regions.
- the transformed region 15 c is formed on the organic semiconductor layer 15 for blocking crosstalk between TFTs 10 and 10 ′.
- Degeneration of an organic material in the organic semiconductor layer 15 causes an increase in resistance. That is, when the size of the crystals of organic material in the organic semiconductor layer 15 becomes smaller, the resistance of the degenerated organic material increases. Accordingly, the degenerated organic material becomes an obstacle to transferring the carrier. Therefore, the degenerated organic material provides the same result as patterning the organic semiconductor layer to block carrier transferring between adjacent TFTs.
- the method of Ficker is used for obtaining the same result as patterning the organic semiconductor layer 15 . That is, the laser is locally directed to a predetermined region of the organic semiconductor layer 15 for forming the transformed layer 15 c .
- the transformed layer 15 c blocks carrier transfer between adjacent TFTs.
- the transformed layer 15 c provides the same result as patterning the organic semiconductor layer 15 .
- the transformed layer 15 c can be formed by various other methods in addition to the method of Ficker supra.
- the transformed region 15 c may be formed by locally performing a thermal process on a predetermined region of the organic semiconductor layer. That is, if a region corresponding to the transformed layer 15 c of the organic semiconductor layer 15 is locally thermal processed, the region of the organic semiconductor layer 15 is transformed so that the transformed region 15 c is has degraded characteristics, that is it has lowered carrier mobility.
- the local thermal process may be performed by irradiating light, such as UV rays, to a predetermined region of the organic semiconductor layer 15 .
- light such as UV rays
- the present embodiments are not limited to irradiating the transformed layer 15 c with light for a thermal process.
- the local thermal process can be performed by arranging a heating wire pattern under the substrate 11 for heating the predetermined region of the organic semiconductor layer 15 c.
- the transformed region can be formed so that it results in various patterns.
- FIGS. 4 through 17 show various patterns of a transformed region in accordance with the present embodiments.
- 12 a represents a gate wire of a gate electrode 12 for transmitting a gate signal and data-wire 14 a is connected to one of a source/drain electrode 14 .
- FIGS. 4 through 7 show a transformed region 15 c having a closed curve shape of a boundary around a channel region 15 a .
- the closed curve shape of the boundary may be formed to have a predetermined thickness.
- the transformed region 15 c is formed to have a closed curve shape of inner boundary for forming the transformed region 15 c on outside of the channel region 15 a as shown in FIGS. 5 and 7 .
- the boundary of the transformed region 15 c may overlap a predetermined portion of the gate electrode 12 as shown in FIGS. 4 and 5 . Also, the boundary of the transformed region 15 c may be formed on the outside region of the gate electrode 12 as shown in FIGS. 6 and 7 . The boundary of the transformed region 15 c may be arranged at the inside of the gate wire 12 a as shown in FIGS. 4 and 5 and the boundary of the transformed region 15 c may be arranged outside of the gate wire 12 a as shown in FIGS. 6 and 7 .
- boundaries of the transformed regions 15 c may be formed on a pair of substantially parallel lines and the channel region 15 a is located between the substantially parallel lines.
- the transformed region 15 c may be formed to have a line shape with a predetermined thickness. Furthermore, the transformed region 15 c may be formed on an entire region which is outside the channel region 15 a and inside boundaries of two transformed regions 15 c are substantially parallel each other as shown in FIGS. 9, 11 , 13 and 15 .
- a pair of the substantially parallel lines may be substantially parallel to the gate wire 12 a as shown in FIGS. 8 through 11 . Furthermore, a pair of the substantially parallel lines may be substantially parallel to one of the wires of the source/drain electrodes 14 as shown in FIGS. 12 through 15 .
- the transformed region 15 c may be formed across the gate electrode 12 on the inside of the gate wire 12 a as shown in FIGS. 8 and 9 . Also, the transformed regions 15 c may be formed on outside of the gate wire 12 a and on outside of the gate electrode 12 as shown in FIGS. 10 and 11 .
- the transformed region 12 may be formed to have an inside boundary across the source/drain electrode 14 as shown in FIGS. 12 and 13 and the transformed region 15 c is formed on the outside of the source/drain electrode 14 as shown in FIGS. 14 and 15 .
- the transformed regions 15 c may be formed on two pairs of substantially parallel lines.
- the channel region 15 a is located between the transformed regions 15 c formed on the two pairs of substantially parallel lines.
- One of two pairs of substantially parallel lines may be substantially parallel to the gate wire 12 a and the other of two pairs is substantially parallel to one 14 a wires of source/drain electrodes 14 .
- the transformed region 15 c may be formed across the gate electrode 12 and the source/drain electrode 14 .
- the transformed region 15 c may be formed on outside of the gate electrode 12 and the source/drain electrode 14 as shown in FIG. 17 .
- the transformed regions 15 c further includes a line substantially parallel to a line connecting the source/drain regions 15 b and the channel region 15 a . Accordingly, a width of the channel region 15 a can be verified, by the transformed region 15 c so as to be closer to the design width, or anticipated width.
- the thin film transistor may have various lamination structures in addition to the lamination structure shown in FIG. 1 .
- FIG. 18 is a diagram of a thin film transistor having a lamination structure in accordance with one embodiment.
- the gate insulation layer 13 is formed on the substrate 11 and the organic semiconductor layer 15 is formed on the gate insulation layer 13 .
- the source/drain electrodes 14 are formed on the organic semiconductor layer 15 .
- the predetermined region of the organic semiconductor layer 15 is irradiated with light to form the transformed region 15 c before forming the source/drain electrodes on the organic semiconductor layer 15 .
- FIG. 19 is a diagram of a thin film transistor having another lamination structure.
- a passivation layer 17 is additionally formed on the organic semiconductor layer 15 .
- the passivation layer 17 covers the source/drain electrodes 14 and 14 ′.
- the passivation layer 17 includes opening units 17 a and 17 a ′.
- the channel regions 15 a and 15 a ′ may be formed on the opening units 17 and 17 a′.
- the inorganic material includes, for example, SiO 2 , SiNx, AL 2 O 3 , TiO 2 , Ta 2 O 5 , HfO 2 , ZrO 2 , BST ((Ba,Sr) TiO 3 ) and PZT ((Pb,Zr) TiO 3 ).
- the organic material can include for example, a common polymer such as PMMA (polymethyl methacrylate), and PS (polystyrene), a polymer derivative having phenol group, an acrylic polymer, an imide polymer, an aryl-ether polymer, an amide polymer, a fluoric polymer, a p-xylene polymer, a vinyl alcoholic polymer or a blend of any of these.
- a common polymer such as PMMA (polymethyl methacrylate), and PS (polystyrene)
- a polymer derivative having phenol group an acrylic polymer, an imide polymer, an aryl-ether polymer, an amide polymer, a fluoric polymer, a p-xylene polymer, a vinyl alcoholic polymer or a blend of any of these.
- inorganic-organic stacked layers can be used.
- SAM process a conventional process for forming a Self-Assembled Monolayer
- OTS Oxetadecyltrimethoxysilane
- HMDS hexamethyldisilazane
- FIG. 20 is a diagram of a thin film transistor (TFT) having a staggered structure in accordance with another embodiment.
- TFT thin film transistor
- the source/drain electrodes 14 and 14 ′ are formed on the substrate 11 and the organic semiconductor layer 15 is formed on the source/drain electrodes 14 and 14 ′.
- the organic semiconductor layer 15 covers the source/drain electrodes 14 and 14 ′.
- the gate insulation layer 13 is formed on the organic semiconductor layer 15 and the gate electrodes 12 and 12 ′ are formed where the channel regions 15 a and 15 a ′ are faced.
- the transformed region 15 c is formed on a predetermined region between TFTs 10 and 10 ′ of the organic semiconductor layer 15 .
- the source/drain electrodes 14 and 14 ′ may be formed after forming the organic semiconductor layer 15 on the substrate 11 as shown in FIG. 21 .
- the light is radiated or the terminal process is performed after forming the organic semiconductor layer 15 on the substrate 11 and before forming the source/drain electrodes 14 and 14 ′.
- the SAM process including OTS and HMD can be performed on an uppermost layer adjacent to the organic semiconductor layer 15 of the thin film transistors of FIGS. 20 and 21 . Also, the uppermost layer of the thin film transistors of FIGS. 20 and 21 can be coated with the fluoric polymer thin film or the common polymer thin film.
- the above mentioned transformed region 15 c may be implemented on various structures of the thin film transistor.
- TFT thin film transistors
- LCD liquid crystal display
- FIG. 22 is a diagram of an organic light emitting display having a thin film transistor in accordance with an embodiment.
- FIG. 22 shows one of the subpixels included in the organic light emitting display.
- the subpixel includes an organic light emitting diode (OLED) as a self emitting element, at least one of thin film transistors and an additional capacitor (not shown).
- OLED organic light emitting diode
- the organic light emitting display has various pixel patterns according to colors emitted from the organic light emitting diode (OLED).
- the organic light emitting display includes pixels for red, green and blue.
- each subpixel of red, green and blue colors includes a TFT and the OLED.
- the TFT may be one of the TFTs described above. However, the present embodiments are not limited to the above mentioned TFTs.
- the subpixel may have various structures of thin film transistors.
- the thin film transistor (TFT) 20 is formed on an insulation substrate 21 .
- the TFT 20 includes a gate electrode 22 having a predetermined pattern on a substrate 21 , a source/drain electrode 24 formed on the gate insulator layer 23 and an organic semiconductor layer 25 is formed on the source/drain electrodes 24 .
- the organic semiconductor layer 25 includes a source/drain region 25 b , a channel region 25 a connecting the source/drain regions 25 b and a transformed region 25 c .
- the transformed region 25 c is identical to the transformed region 15 c in FIGS. 1 through 21 and thus detailed explanation of the transformed region 25 c is omitted.
- a passivation layer 28 is formed to cover the TFT 20 .
- the passivation layer 28 may be formed as a single layer or a plurality of layers by using an organic material (for example PMMA (polymethyl methacrylate), PS (polystyrene), a polymer derivative having one or more phenol groups, an acrylic polymer, an imide polymer, an aryl-ether polymer, an amide polymer, a fluoric polymer, a p-xylene polymer, or a vinyl alcoholic polymer), an inorganic material (such as, for example, SiO 2 , SiN x , AL 2 O 3 , TiO 2 , Ta 2 O 5 , HfO 2 , ZrO 2 , BST or PST) or a blend of organic and inorganic materials.
- an organic material for example PMMA (polymethyl methacrylate), PS (polystyrene), a polymer derivative having one or more phenol groups, an acrylic polymer, an im
- a pixel electrode 31 is formed on the passivation layer 28 and a pixel definition layer 29 is formed on the pixel electrode 31 .
- the pixel electrode 31 is one of the electrodes of the OLED 30 .
- a predetermined opening unit 29 a is formed on the pixel definition layer 29 and then an organic emitting layer 32 of the OLED 30 is formed.
- the OLED 30 displays predetermined image information by emitting red, green and blue colors according to flow of current.
- the OLED 30 includes a pixel electrode 31 connected to one of the source/drain electrodes 24 of the TFT 20 , a counter electrode 33 formed for covering the entire pixel and an organic emission layer 32 .
- the pixel electrode 34 and the counter electrode 33 are insulated by the organic emission layer 32 .
- the pixel electrode 34 and the counter electrode 33 supply voltage of different polarities to the organic emission layer 32 for emitting light of colors.
- a small molecule organic layer or a polymer organic layer may be used for the organic emission layer 32 .
- the organic emission layer 32 may be formed as a single structure or a complex structure including a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electro transport layer (ETL) and an electron injection layer (EIL).
- HIL hole injection layer
- HTL hole transport layer
- EML emission layer
- ETL electro transport layer
- EIL electron injection layer
- N, N′-Di (naphthalene-1-yl)-N, N′-diphenyl-benzidine (NPB) and tris-8-hydroxyquionoline aluminium (Alq3) can be used for the organic material.
- the small molecule organic layer is formed by a vacuum evaporation method.
- the organic emission layer 32 includes the HTL and EML.
- PEDOT polyethylenedioxythiophene
- a polymer organic material including poly-phenylenevinylene (PPV) or polyfluorene is used for the EML.
- a screen printing or an ink-jet printing method can be used for forming the organic emission layer 32 .
- the organic layer is not limited to being formed by the above mentioned method and materials. Various embodiments can be implemented to form the organic layer.
- the pixel electrode 31 works as an anode electrode and the counter electrode 33 works as cathode electrode. However, the polarity of the pixel electrode 31 and the counter electrode 33 may be switched.
- the present embodiments are not limited to have the above mentioned structure.
- Various structures of organic electroluminescent displays may be utilized in the present embodiments.
- a bottom alignment layer (not shown) is formed to cover the pixel electrode 31 for manufacturing a bottom substrate of the LCD.
- the TFT of the present embodiments may each be equipped with one or more sub pixels as shown in FIG. 22 . Also, the TFT of the present embodiments may be equipped with a driver circuit (not shown) or other electric circuits which do not reproduce images.
- a flexible plastic substrate is preferably used as the substrate 21 for the organic electro luminescent display.
- the TFT is distinguished from an adjacent TFT by the transformed region in the present embodiments.
- the transformed region having a different size of crystal is formed on the organic semiconductor layer between the TFTs. This gives the same result as patterning the organic semiconductor layer. Therefore, the complicated pattern process is not performed for manufacturing the TFT of the present embodiments.
- a dry etching process or a wet etching process is not required for manufacturing the TFT of the present embodiments. Therefore, characteristic degradation of the active channel is minimized.
- etching is not required, processing time of a TFT is reduced and the processing efficiency of the TFT is improved.
- leakage current is minimized by isolating the channel region from the adjacent TFT.
Abstract
Description
- This application claims the benefit of Korean Patent Application No. 10-2004-0111097, filed on Dec. 23, 2004, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.
- 1. Field of the Invention
- The present embodiments relate to a thin film transistor (TFT), a flat panel display having the TFT and a method for manufacturing the TFT and the flat panel display; and more particularly, to a thin film transistor (TFT) having a transformed region in an organic semiconductor layer that provides the same result as patterning the organic semiconductor layer, a flat panel display having the TFT and a method for manufacturing the TFT and the flat panel display.
- 2. Description of the Related Art
- A thin film transistor (TFT) has been used in a flat panel display as a switching element for controlling operations of each pixel or as a driving element for operating a pixel. The TFT includes a liquid crystal display element, an organic electroluminescent display element and an inorganic light emitting display element.
- The TFT includes an active layer having a source region and a drain region which are doped with a high concentration of impurity and a channel region formed between the source region and the drain region. The TFT also includes a gate electrode formed on a predetermined region of a substrate where the channel region is faced and the gate electrode is insulated from the active layer. The TFT further includes a source electrode coupled to the source region and a drain electrode, each coupled to the drain region.
- The flat panel display has become thinner and has been required to have flexibility.
- For manufacturing thinner flat panel displays having flexibility, a plastic substrate has been used as a substrate of the flat panel display instead of a glass substrate. When using a plastic substrate, a high temperature thermal process cannot be performed in manufacturing the flat panel display. Accordingly, there are difficulties in using a conventional polysilicon thin film transistor for manufacturing the flat panel display.
- To overcome the above problem, an organic semiconductor has been used. The organic semiconductor can be formed in a low temperature thermal process for manufacturing a thin film transistor (TFT) which is relatively inexpensive.
- However, a photo lithographing method cannot be used for patterning the organic semiconductor layer. In other words, the pattern is formed on the organic semiconductor forming an active channel. If a combination method of a wet type and a dry type of etching methods is used for forming the pattern on the organic semiconductor, the organic semiconductor is damaged.
- Therefore, a new method for patterning the organic semiconductor is needed.
- One embodiment relates to a thin film transistor, comprising:
-
- a gate electrode;
- a source electrode and a drain electrode, each insulated from the gate electrode; and
- an organic semiconductor layer insulated from the gate electrode and coupled to the source electrode and the drain electrode,
- wherein the organic semiconductor layer comprises a transformed region around at least a channel region, the transformed region having a crystal structure distinguished from other regions.
- In one aspect, the crystal size of the transformed region is smaller than the crystal size of the other regions.
- In another aspect, the transformed region has lower current mobility than the other regions.
- In yet another aspect, the transformed region is formed by emitting light on a predetermined region where the transformed region is formed.
- In still another aspect, the transformed region is formed by performing a thermal process on a predetermined region where the transformed region is formed.
- In another aspect, the transformed region comprises a boundary having a closed curve shape surrounding at least the channel region.
- In another aspect, the transformed region comprises a boundary formed on at least one pair of substantially parallel lines where at least the channel region is located between the substantially parallel lines.
- In another aspect, the transformed region comprises a boundary substantially parallel to a line connecting the source region, the channel region and the drain region.
- In another aspect, an insulation layer is formed covering the gate electrode, and the organic semiconductor layer is formed on the insulation layer.
- Another embodiment relates to an insulation layer covering the gate electrode; wherein, the source electrode and drain electrode are each formed on the insulation layer;
-
- a passivation layer covering the insulation layer, the source electrode and the drain electrode; wherein, the passivation layer has an opening over the source electrode or the drain electrode, wherein the organic semiconductor layer is formed on the passivation layer.
- In another aspect, the source electrode and drain electrode are each formed on a substrate and the organic semiconductor layer is formed on the substrate so as to cover the source electrode and drain electrode.
- In yet another aspect, the organic semiconductor layer is formed on a substrate, and the source electrode and the drain electrode are each formed on the organic semiconductor layer.
- In still another aspect, the organic semiconductor layer comprises at least one of pentacene, tetracene, anthracene, naphthalene, alpha-6-thiophene, alpha-4-thiophene, perylene and its derivatives, rubrene and its derivatives, coronene and its derivatives, perylene tetracarboxylic diimide and its derivatives, perylene tetracarboxylic dianhydride and its derivates, oligonaphthalene and its derivatives, oligothiophene of alpha-5-thiophene and its derivatives, phthalocyanine including metal and its derivates, phthalocyanine not including metal and its derivates, naphthalene tetracarboxylic diimide and its derivatives, naphthalene tetracarboxylic dianhydride and its derivatives, pyromellitic dianhydride and its derivatives, pyromellitic diimide and its derivatives, conjugated polymer containing thiophene and its derivatives and polymer containing fluorene and its derivatives.
- Another embodiment relates to a flat panel display, comprising:
-
- a substrate;
- at least one thin film transistor, each of which is formed on the substrate and comprises a gate electrode, a source electrode and a drain electrode, each insulated from the gate electrode and an organic semiconductor layer coupled to the source electrode and the drain electrode and insulated from the gate electrode; and
- a pixel electrode electrically connected to at least one of the source and the drain electrodes of the thin film transistor,
- wherein the organic semiconductor layer comprises a transformed region around at least the channel region of the organic semiconductor layer, wherein the transformed region has a crystal structure which differs from other regions of the organic semiconductor layer.
- In one aspect, the crystal size of the transformed region is smaller than a crystal size of the other regions.
- In another aspect, the transformed region has lower current mobility than the other regions.
- In yet another aspect, the transformed region is formed by irradiating a predetermined region with light where the transformed region is formed.
- In still another aspect, the transformed region is formed by performing a thermal process on a predetermined region where the transformed region is to be formed.
- In another aspect, the transformed region comprises a boundary having a closed curve shape surrounding at least the channel region.
- In another aspect, the transformed region comprises a boundary formed on at least one pair of substantially parallel lines wherein at least the channel region is located between the substantially parallel lines.
- In another aspect, the transformed region comprises a boundary substantially parallel to a line connecting to the source region, the channel region and the drain region.
- In another aspect, an insulation layer is formed for covering the gate electrode and the organic semiconductor layer is formed on the insulation layer.
- Another embodiment relates to an insulation layer covering the gate electrode; wherein, the source electrode and drain electrode are each formed on the insulation layer;
-
- a passivation layer covering the insulation layer, the source electrode and the drain electrode, wherein the passivation layer has an opening over the source electrode or the drain electrode; wherein,
- the organic semiconductor layer is formed on the passivation layer.
- In another aspect, the source electrode and drain electrode are each formed on a substrate and the organic semiconductor layer is formed on the substrate so as to cover the source electrode and drain electrode.
- In yet another aspect, the organic semiconductor layer is formed on a substrate, and the source electrode and the drain electrode are each formed on the organic semiconductor layer.
- In still another aspect, the organic semiconductor layer comprises at least one of pentacene, tetracene, anthracene, naphthalene, alpha-6-thiophene, alpha-4-thiophene, perylene and its derivatives, rubrene and its derivatives, coronene and its derivatives, perylene tetracarboxylic diimide and its derivatives, perylene tetracarboxylic dianhydride and its derivates, oligonaphthalene and its derivatives, oligothiophene of alpha-5-thiophene and its derivatives, phthalocyanine including metal and its derivates, phthalocyanine not including a metal and its derivates, naphthalene tetracarboxylic diimide and its derivatives, naphthalene tetracarboxylic dianhydride and its derivatives, pyromellitic dianhydride and its derivatives, pyromellitic diimide and its derivatives, conjugated polymer containing thiophene and its derivatives and polymer containing fluorene and its derivatives.
- Another embodiment relates to a method of manufacturing a thin film transistor comprising a gate electrode, a source electrode and a drain electrode, each insulated from the gate electrode; and an organic semiconductor layer insulated from the gate electrode and coupled to the source and the drain electrodes,
-
- the method comprises irradiating with light the area around at least a channel region of the organic semiconductor layer wherein the conductivity of the organic semiconductor layer is reduced.
- In one aspect, the organic semiconductor layer is irradiated by a laser.
- In another aspect, the organic semiconductor layer is irradiated with ultraviolet light.
- In yet another aspect, the organic semiconductor layer comprises at least one of pentacene, tetracene, anthracene, naphthalene, alpha-6-thiophene, alpha-4-thiophene, perylene and its derivatives, rubrene and its derivatives, coronene and its derivatives, perylene tetracarboxylic diimide and its derivatives, perylene tetracarboxylic dianhydride and its derivates, oligonaphthalene and its derivatives, oligothiophene of alpha-5-thiophene and its derivatives, phthalocyanine including a metal and its derivates, phthalocyanine not including a metal and its derivates, naphthalene tetracarboxylic diimide and its derivatives, naphthalene tetracarboxylic dianhydride and its derivatives, pyromellitic dianhydride and its derivatives, pyromellitic diimide and its derivatives, conjugate polymer containing thiophene and its derivatives and polymer containing fluorene and its derivatives.
- Another embodiment relates to a method of manufacturing a thin film transistor comprising a gate electrode; a source electrode and a drain electrode, each insulated from the gate electrode; and an organic semiconductor layer insulated from the gate electrode and coupled to the source and drain electrodes,
-
- the method comprises performing a thermal process on the organic semiconductor layer at least near a channel region of the organic semiconductor layer after forming the organic semiconductor layer, wherein the conductivity of the organic semiconductor layer is reduced.
- In one aspect, the organic semiconductor layer comprises at least one of pentacene, tetracene, anthracene, naphthalene, alpha-6-thiophene, alpha-4-thiophene, perylene and its derivatives, rubrene and its derivatives, coronene and its derivatives, perylene tetracarboxylic diimide and its derivatives, perylene tetracarboxylic dianhydride and its derivates, oligonaphthalene and its derivatives, oligothiophene of alpha-5-thiophene and its derivatives, phthalocyanine including a metal and its derivates, phthalocyanine not including a metal or not and its derivates, naphthalene tetracarboxylic diimide and its derivatives, naphthalene tetracarboxylic dianhydride and its derivatives, pyromellitic dianhydride and its derivatives, pyromellitic diimide and its derivatives, conjugate polymer containing thiophene and its derivatives and polymer containing fluorene and its derivatives.
- Another embodiment relates to a method of manufacturing a flat panel display, comprising:
-
- forming a thin film transistor comprising a gate electrode formed on a substrate; a source electrode and a drain electrode, each insulated from the gate electrode; and an organic semiconductor layer insulated from the gate electrode and coupled to the source and drain electrodes; and
- forming a pixel electrode electrically connected to one of the source and the drain electrodes of the thin film transistor,
- the method comprises irradiating with light the area around at least a channel region of the organic semiconductor layer wherein the conductivity of the organic semiconductor layer is reduced.
- In one aspect, the organic semiconductor layer is irradiated with a laser.
- In another aspect, the organic semiconductor layer is irradiated with ultraviolet light.
- In yet another aspect, the organic semiconductor layer comprises at least one of pentacene, tetracene, anthracene, naphthalene, alpha-6-thiophene, alpha-4-thiophene, perylene and its derivatives, rubrene and its derivatives, coronene and its derivatives, perylene tetracarboxylic diimide and its derivatives, perylene tetracarboxylic dianhydride and its derivates, oligonaphthalene and its derivatives, oligothiophene of alpha-5-thiophene and its derivatives, phthalocyanine including a metal and its derivates, phthalocyanine not including metal and its derivates, naphthalene tetracarboxylic diimide and its derivatives, naphthalene tetracarboxylic dianhydride and its derivatives, pyromellitic dianhydride and its derivatives, pyromellitic diimide and its derivatives, conjugate polymer containing thiophene and its derivatives and polymer containing fluorene and its derivatives.
- Another embodiment relates to a method of manufacturing a flat panel display, comprising:
-
- forming a thin film transistor comprising a gate electrode formed on a substrate, a source electrode and a drain electrode, each insulated from the gate electrode; and an organic semiconductor layer insulated from the gate electrode and coupled to the source and the drain electrodes; and
- forming a pixel electrode electrically connected to one of the source and the drain electrodes of the thin film transistor,
- the method comprises performing a thermal process on the organic semiconductor layer at least near a channel region of the organic semiconductor layer after forming the organic semiconductor layer, wherein the conductivity of the organic semiconductor layer is reduced.
- In one aspect, the organic semiconductor layer comprises at least one of pentacene, tetracene, anthracene, naphthalene, alpha-6-thiophene, alpha-4-thiophene, perylene and its derivatives, rubrene and its derivatives, coronene and its derivatives, perylene tetracarboxylic diimide and its derivatives, perylene tetracarboxylic dianhydride and its derivates, oligonaphthalene and its derivatives, oligothiophene of alpha-5-thiophene and its derivatives, phthalocyanine including metal and its derivates, phthalocyanine not including metal and its derivates. naphthalene tetracarboxylic diimide and its derivatives, naphthalene tetracarboxylic dianhydride and its derivatives, pyromellitic dianhydride and its derivatives, pyromellitic diimide and its derivatives, conjugate polymer containing thiophene and its derivatives and polymer containing fluorene and its derivatives.
- The above and other features and advantages of the present embodiments will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which:
-
FIG. 1 is a cross sectional view of a thin film transistor in accordance with one embodiment; -
FIG. 2 is a cross sectional view of the thin film transistor ofFIG. 1 which shows a method for manufacturing the thin film transistor in accordance with an embodiment; -
FIG. 3 is a cross sectional view of the thin film transistor ofFIG. 1 which shows a method for manufacturing the thin film transistor in accordance with another embodiment; -
FIGS. 4 through 17 are diagrams showing various patterns of transformed region; -
FIGS. 18 through 21 are cross sectional views of thin film transistors having various lamination structures in accordance with the present embodiments; and -
FIG. 22 is a cross sectional view of an organic light emitting display having a thin film transistor ofFIG. 1 . - The present embodiments will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments are shown.
-
FIG. 1 is a cross sectional view of a thin film transistor (TFT) in accordance with one embodiment. - As shown in
FIG. 1 ,TFTs substrate 11. A flexible substrate may be used as thesubstrate 11. That is, a plastic substrate may be used as thesubstrate 11. However, the present embodiments are not limited to the use of a plastic substrate. Any flexible substrate can be used as thesubstrate 11 such as a predetermined thickness of flexible substrate made by a glass material or a metal material. - As shown in
FIG. 1 , theTFTs substrate 11 and they are adjacent. Also,TFTs TFT 10 is explained. - A
gate electrode 12 having a predetermined pattern is formed on thesubstrate 11 and agate insulation layer 13 is formed to cover thegate electrode 12. A source electrode and adrain electrode 14 are each formed on thegate insulation layer 13. As shown inFIG. 1 , the source electrode and thedrain electrode 14 may be formed to overlap with a predetermined part of thegate electrode 12. However, the present embodiments are not limited to having the source electrode and thedrain electrode 14 overlapping with thegate electrode 12. Anorganic semiconductor layer 15 is formed on the source electrode and thedrain electrode 14 to cover the entire surface of theTFT 10. - The
organic semiconductor layer 15 includes a source and adrain region 15 b and achannel region 15 a connecting the source and thedrain regions 15 b. An n-type organic semiconductor or a p-type organic semiconductor may be used for theorganic semiconductor layer 15. Also, an n-type impurity or a p-type impurity may be doped on the source and thedrain regions 15 b. - The
organic semiconductor layer 15 is formed by using organic semiconductor material including, for example, pentacene, tetracene, anthracene, naphthalene, alpha-6-thiophene, alpha-4-thiophene, perylene and its derivatives, rubrene and its derivatives, coronene and its derivatives, perylene tetracarboxylic diimide and its derivatives, perylene tetracarboxylic dianhydride and its derivates, a oligonaphthalene and its derivatives, oligothiophene of alpha-5-thiophene and its derivatives, phthalocyanine including a metal (e.g. Cu, Pt, etc) and its derivatives, phthalocyanine not including a metal (e.g. Cu, Pt, etc) and its derivates, naphthalene tetracarboxylic diimide and its derivatives, naphthalene tetracarboxylic dianhydride and its derivatives, pyromellitic dianhydride and its derivatives, pyromellitic diimide and its derivatives, a conjugate polymer containing thiophene and its derivatives and a polymer containing fluorene and its derivatives. - As shown in
FIG. 1 , theorganic semiconductor layer 15 is entirely evaporated on theTFTs TFT 10 andTFT 10′. Therefore, if patterning of theorganic semiconductor layer 15 is not performed, it may generate cross-talk betweenTFTs - For preventing generation of cross-talk between the
TFTs region 15 c is formed between theTFTs region 15 c is a predetermined region of theorganic semiconductor layer 15 which is transformed to have a crystal structure different from other regions of theorganic semiconductor layer 15. - In a view of
single TFT 10, the transformedregion 15 c is formed around at least thechannel region 15 a. The transformedregion 15 c provides the same result as patterning theorganic semiconductor layer 15. - A predetermined region of the
semiconductor layer 15 is decomposed, phase transited or photo-oxidized to form the transformedregion 15 c. That is, by decomposing, phase transiting or photo-oxidizing, a crystal structure of the predetermined region becomes modified. In one embodiment, the predetermined region of theorganic semiconductor layer 15 is irradiated with light to modify the crystal structure of the predetermined region of theorganic semiconductor layer 15 as shown inFIGS. 2 and 3 . -
FIG. 2 is a cross sectional view of a thin film transistor for demonstrating a method for forming a transformedregion 15 c by irradiating a predetermined region of anorganic semiconductor layer 15 with a laser andFIG. 3 is a cross sectional view of a thin film transistor for demonstrating a method forming a transformedregion 15 c by exposing a predetermined region of anorganic semiconductor layer 15 to ultraviolet (UV) rays. - As shown in
FIG. 2 , if the predetermined region of theorganic semiconductor layer 15 is irradiated with a laser, the crystal structure of the predetermined region is changed by the heat locally generated by the laser. That is, the heat generated by the laser decomposes, photo-oxidizes or phase-transits the crystal structure of the predetermined region to be different from other regions of the organic semiconductor layer 15 (e.g. having a smaller crystal size). - As shown in
FIG. 3 , amask 40 having a shieldingportion 41 and anopening portion 42 is arranged above theTFTs mask 40 is irradiated with light. The openingportion 42 passes the radiated UV rays to the predetermined region of theorganic semiconductor layer 15 and the shieldingportion 41 blocks the UV rays irradiating theorganic semiconductor layer 15. The predetermined region of theorganic semiconductor layer 15 is exposed to the UV rays and the crystal structure of the predetermined region is changed by being decomposed, phase-transited or photo-oxidized. The crystal structure of the predetermined region becomes different from crystal structures of other regions of theorganic semiconductor layer 15. - One characteristic of the transformed
region 15 c formed by the above mentioned methods becomes different from the other regions of theorganic semiconductor layer 15. That is, the size of the crystal of the transformedlayer 15 c becomes smaller compared to crystals of other regions. - The transformed
region 15 c is formed on theorganic semiconductor layer 15 for blocking crosstalk betweenTFTs - Degeneration of an organic material in the
organic semiconductor layer 15 causes an increase in resistance. That is, when the size of the crystals of organic material in theorganic semiconductor layer 15 becomes smaller, the resistance of the degenerated organic material increases. Accordingly, the degenerated organic material becomes an obstacle to transferring the carrier. Therefore, the degenerated organic material provides the same result as patterning the organic semiconductor layer to block carrier transferring between adjacent TFTs. - After a laser is directed to a predetermined region of the
organic semiconductor layer 15, the carrier mobility of the predetermined region significantly decreases: This is disclosed by J. Ficker in Applied Physics Letters, vol. 85, pp. 1377-1379, 2004 (hereinafter “Fisher”). - In one embodiment, the method of Ficker is used for obtaining the same result as patterning the
organic semiconductor layer 15. That is, the laser is locally directed to a predetermined region of theorganic semiconductor layer 15 for forming the transformedlayer 15 c. The transformedlayer 15 c blocks carrier transfer between adjacent TFTs. The transformedlayer 15 c provides the same result as patterning theorganic semiconductor layer 15. - The transformed
layer 15 c can be formed by various other methods in addition to the method of Ficker supra. - It is known that if heat is applied to a pentacene layer evaporated in normal temperature, the crystallinity of the pentacene layer is maximized when the temperature becomes about 60° C., and a size of crystal grain becomes smaller and roughness of surface of the pentacene layer increases when the temperature increases over 80° C. (Rongbin Ye, Jpn. J. Appl. Phys. Vol. 42 (2003), pp. 4473-4475.)
- Furthermore, it has been disclosed that characteristics of elements become degraded since the morphology is modified by annealing alpha-sexithienyl (a-6T) at 90° C. (F. Dinelli Synthetic Metals 146, pp. 373-376, 2004.) Moreover, if poly 3-hexylthiophene is annealed at high temperature, the poly 3-hexylthiophene is easily oxidized and the element characteristics become degraded in the article. (Brains A. Matties et. al., Mat. Res. Soc. Symp. Proc. Vol. 771 (2003), L10.35.1.)
- Based on the above mentioned facts, the transformed
region 15 c may be formed by locally performing a thermal process on a predetermined region of the organic semiconductor layer. That is, if a region corresponding to the transformedlayer 15 c of theorganic semiconductor layer 15 is locally thermal processed, the region of theorganic semiconductor layer 15 is transformed so that the transformedregion 15 c is has degraded characteristics, that is it has lowered carrier mobility. - The local thermal process may be performed by irradiating light, such as UV rays, to a predetermined region of the
organic semiconductor layer 15. However, the present embodiments are not limited to irradiating the transformedlayer 15 c with light for a thermal process. The local thermal process can be performed by arranging a heating wire pattern under thesubstrate 11 for heating the predetermined region of theorganic semiconductor layer 15 c. - The transformed region can be formed so that it results in various patterns.
-
FIGS. 4 through 17 show various patterns of a transformed region in accordance with the present embodiments. - In
FIGS. 4 through 17 , 12 a represents a gate wire of agate electrode 12 for transmitting a gate signal and data-wire 14 a is connected to one of a source/drain electrode 14. -
FIGS. 4 through 7 show a transformedregion 15 c having a closed curve shape of a boundary around achannel region 15 a. As shown inFIGS. 4 and 6 , the closed curve shape of the boundary may be formed to have a predetermined thickness. Also, the transformedregion 15 c is formed to have a closed curve shape of inner boundary for forming the transformedregion 15 c on outside of thechannel region 15 a as shown inFIGS. 5 and 7 . - The boundary of the transformed
region 15 c may overlap a predetermined portion of thegate electrode 12 as shown inFIGS. 4 and 5 . Also, the boundary of the transformedregion 15 c may be formed on the outside region of thegate electrode 12 as shown inFIGS. 6 and 7 . The boundary of the transformedregion 15 c may be arranged at the inside of thegate wire 12 a as shown inFIGS. 4 and 5 and the boundary of the transformedregion 15 c may be arranged outside of thegate wire 12 a as shown inFIGS. 6 and 7 . - As shown in FIGS. 8 to 15, boundaries of the transformed
regions 15 c may be formed on a pair of substantially parallel lines and thechannel region 15 a is located between the substantially parallel lines. - As shown in
FIGS. 8, 10 , 12 and 14, the transformedregion 15 c may be formed to have a line shape with a predetermined thickness. Furthermore, the transformedregion 15 c may be formed on an entire region which is outside thechannel region 15 a and inside boundaries of two transformedregions 15 c are substantially parallel each other as shown inFIGS. 9, 11 , 13 and 15. - A pair of the substantially parallel lines may be substantially parallel to the
gate wire 12 a as shown inFIGS. 8 through 11 . Furthermore, a pair of the substantially parallel lines may be substantially parallel to one of the wires of the source/drain electrodes 14 as shown inFIGS. 12 through 15 . - The transformed
region 15 c may be formed across thegate electrode 12 on the inside of thegate wire 12 a as shown inFIGS. 8 and 9 . Also, the transformedregions 15 c may be formed on outside of thegate wire 12 a and on outside of thegate electrode 12 as shown inFIGS. 10 and 11 . - Furthermore, the transformed
region 12 may be formed to have an inside boundary across the source/drain electrode 14 as shown inFIGS. 12 and 13 and the transformedregion 15 c is formed on the outside of the source/drain electrode 14 as shown inFIGS. 14 and 15 . - As shown in
FIGS. 16 and 17 , the transformedregions 15 c may be formed on two pairs of substantially parallel lines. Thechannel region 15 a is located between the transformedregions 15 c formed on the two pairs of substantially parallel lines. One of two pairs of substantially parallel lines may be substantially parallel to thegate wire 12 a and the other of two pairs is substantially parallel to one 14 a wires of source/drain electrodes 14. As shown inFIG. 16 , the transformedregion 15 c may be formed across thegate electrode 12 and the source/drain electrode 14. Also, the transformedregion 15 c may be formed on outside of thegate electrode 12 and the source/drain electrode 14 as shown inFIG. 17 . - As shown in
FIGS. 4 through 17 , the transformedregions 15 c further includes a line substantially parallel to a line connecting the source/drain regions 15 b and thechannel region 15 a. Accordingly, a width of thechannel region 15 a can be verified, by the transformedregion 15 c so as to be closer to the design width, or anticipated width. - The thin film transistor (TFT) may have various lamination structures in addition to the lamination structure shown in
FIG. 1 . -
FIG. 18 is a diagram of a thin film transistor having a lamination structure in accordance with one embodiment. As shown inFIG. 18 , thegate insulation layer 13 is formed on thesubstrate 11 and theorganic semiconductor layer 15 is formed on thegate insulation layer 13. After forming theorganic semiconductor layer 15, the source/drain electrodes 14 are formed on theorganic semiconductor layer 15. The predetermined region of theorganic semiconductor layer 15 is irradiated with light to form the transformedregion 15 c before forming the source/drain electrodes on theorganic semiconductor layer 15. -
FIG. 19 is a diagram of a thin film transistor having another lamination structure. As shown inFIG. 19 , apassivation layer 17 is additionally formed on theorganic semiconductor layer 15. Thepassivation layer 17 covers the source/drain electrodes passivation layer 17 includes openingunits channel regions units - An organic material, an inorganic material or both can be used for forming the
passivation layer 17. The inorganic material includes, for example, SiO2, SiNx, AL2O3, TiO2, Ta2O5, HfO2, ZrO2, BST ((Ba,Sr) TiO3) and PZT ((Pb,Zr) TiO3). Also, the organic material can include for example, a common polymer such as PMMA (polymethyl methacrylate), and PS (polystyrene), a polymer derivative having phenol group, an acrylic polymer, an imide polymer, an aryl-ether polymer, an amide polymer, a fluoric polymer, a p-xylene polymer, a vinyl alcoholic polymer or a blend of any of these. Also, inorganic-organic stacked layers can be used. - It is possible to perform a SAM process (a conventional process for forming a Self-Assembled Monolayer) such as OTS (Octadecyltrimethoxysilane) and HMDS (hexamethyldisilazane) on an uppermost layer adjacent to the
organic semiconductor layer 15 of thepassivation layer 17 and also a coating process can be performed on the uppermost layer by using a fluoric polymer thin film or the common polymer thin film. -
FIG. 20 is a diagram of a thin film transistor (TFT) having a staggered structure in accordance with another embodiment. - As shown in
FIG. 20 , the source/drain electrodes substrate 11 and theorganic semiconductor layer 15 is formed on the source/drain electrodes organic semiconductor layer 15 covers the source/drain electrodes gate insulation layer 13 is formed on theorganic semiconductor layer 15 and thegate electrodes channel regions - The transformed
region 15 c is formed on a predetermined region betweenTFTs organic semiconductor layer 15. - Accordingly, when irradiation with light or the thermal process is performed for forming the transformed
region 15 c after forming the source/drain electrodes substrate 11 and forming theorganic semiconductor layer 15 for covering the source/drain electrodes - However, the source/
drain electrodes organic semiconductor layer 15 on thesubstrate 11 as shown inFIG. 21 . In this case, the light is radiated or the terminal process is performed after forming theorganic semiconductor layer 15 on thesubstrate 11 and before forming the source/drain electrodes - The SAM process including OTS and HMD can be performed on an uppermost layer adjacent to the
organic semiconductor layer 15 of the thin film transistors ofFIGS. 20 and 21 . Also, the uppermost layer of the thin film transistors ofFIGS. 20 and 21 can be coated with the fluoric polymer thin film or the common polymer thin film. - The above mentioned transformed
region 15 c may be implemented on various structures of the thin film transistor. - The above mentioned thin film transistors (TFT) may be included in a flat panel display such as an organic light emitting display and liquid crystal display (LCD).
-
FIG. 22 is a diagram of an organic light emitting display having a thin film transistor in accordance with an embodiment. -
FIG. 22 shows one of the subpixels included in the organic light emitting display. The subpixel includes an organic light emitting diode (OLED) as a self emitting element, at least one of thin film transistors and an additional capacitor (not shown). - The organic light emitting display has various pixel patterns according to colors emitted from the organic light emitting diode (OLED). In one embodiment, the organic light emitting display includes pixels for red, green and blue.
- As shown in
FIG. 22 , each subpixel of red, green and blue colors includes a TFT and the OLED. The TFT may be one of the TFTs described above. However, the present embodiments are not limited to the above mentioned TFTs. The subpixel may have various structures of thin film transistors. - As shown in
FIG. 22 , the thin film transistor (TFT) 20 is formed on aninsulation substrate 21. - The
TFT 20 includes agate electrode 22 having a predetermined pattern on asubstrate 21, a source/drain electrode 24 formed on thegate insulator layer 23 and anorganic semiconductor layer 25 is formed on the source/drain electrodes 24. - The
organic semiconductor layer 25 includes a source/drain region 25 b, achannel region 25 a connecting the source/drain regions 25 b and a transformedregion 25 c. The transformedregion 25 c is identical to the transformedregion 15 c inFIGS. 1 through 21 and thus detailed explanation of the transformedregion 25 c is omitted. - After forming the
organic semiconductor layer 25, apassivation layer 28 is formed to cover theTFT 20. Thepassivation layer 28 may be formed as a single layer or a plurality of layers by using an organic material (for example PMMA (polymethyl methacrylate), PS (polystyrene), a polymer derivative having one or more phenol groups, an acrylic polymer, an imide polymer, an aryl-ether polymer, an amide polymer, a fluoric polymer, a p-xylene polymer, or a vinyl alcoholic polymer), an inorganic material (such as, for example, SiO2, SiNx, AL2O3, TiO2, Ta2O5, HfO2, ZrO2, BST or PST) or a blend of organic and inorganic materials. - A
pixel electrode 31 is formed on thepassivation layer 28 and apixel definition layer 29 is formed on thepixel electrode 31. Thepixel electrode 31 is one of the electrodes of theOLED 30. Apredetermined opening unit 29 a is formed on thepixel definition layer 29 and then an organic emittinglayer 32 of theOLED 30 is formed. - The
OLED 30 displays predetermined image information by emitting red, green and blue colors according to flow of current. TheOLED 30 includes apixel electrode 31 connected to one of the source/drain electrodes 24 of theTFT 20, acounter electrode 33 formed for covering the entire pixel and anorganic emission layer 32. - The pixel electrode 34 and the
counter electrode 33 are insulated by theorganic emission layer 32. The pixel electrode 34 and thecounter electrode 33 supply voltage of different polarities to theorganic emission layer 32 for emitting light of colors. - A small molecule organic layer or a polymer organic layer may be used for the
organic emission layer 32. In case of using the small molecule organic layer, theorganic emission layer 32 may be formed as a single structure or a complex structure including a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electro transport layer (ETL) and an electron injection layer (EIL). A copper phthalocyanine (CuPc), N, N′-Di (naphthalene-1-yl)-N, N′-diphenyl-benzidine (NPB) and tris-8-hydroxyquionoline aluminium (Alq3) can be used for the organic material. The small molecule organic layer is formed by a vacuum evaporation method. - In case of using the polymer organic layer, the
organic emission layer 32 includes the HTL and EML. PEDOT (polyethylenedioxythiophene) is used for the HTL and a polymer organic material including poly-phenylenevinylene (PPV) or polyfluorene is used for the EML. A screen printing or an ink-jet printing method can be used for forming theorganic emission layer 32. - However, the organic layer is not limited to being formed by the above mentioned method and materials. Various embodiments can be implemented to form the organic layer.
- The
pixel electrode 31 works as an anode electrode and thecounter electrode 33 works as cathode electrode. However, the polarity of thepixel electrode 31 and thecounter electrode 33 may be switched. - However, the present embodiments are not limited to have the above mentioned structure. Various structures of organic electroluminescent displays may be utilized in the present embodiments.
- In the case of liquid crystal display (LCD), a bottom alignment layer (not shown) is formed to cover the
pixel electrode 31 for manufacturing a bottom substrate of the LCD. - The TFT of the present embodiments may each be equipped with one or more sub pixels as shown in
FIG. 22 . Also, the TFT of the present embodiments may be equipped with a driver circuit (not shown) or other electric circuits which do not reproduce images. - A flexible plastic substrate is preferably used as the
substrate 21 for the organic electro luminescent display. - As mentioned above, the TFT is distinguished from an adjacent TFT by the transformed region in the present embodiments. In the present embodiments, the transformed region having a different size of crystal is formed on the organic semiconductor layer between the TFTs. This gives the same result as patterning the organic semiconductor layer. Therefore, the complicated pattern process is not performed for manufacturing the TFT of the present embodiments.
- Also, a dry etching process or a wet etching process is not required for manufacturing the TFT of the present embodiments. Therefore, characteristic degradation of the active channel is minimized.
- Also, because etching is not required, processing time of a TFT is reduced and the processing efficiency of the TFT is improved.
- Moreover, leakage current is minimized by isolating the channel region from the adjacent TFT.
- While the present embodiments have been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present embodiments as defined by the following claims.
Claims (38)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/641,277 US8043887B2 (en) | 2004-12-23 | 2009-12-17 | Thin film transistor, flat panel display including the thin film transistor, and method for manufacturing the thin film transistor and the flat panel display |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2004-0111097 | 2004-12-23 | ||
KR1020040111097A KR100670255B1 (en) | 2004-12-23 | 2004-12-23 | TFT, flat panel display therewith, manufacturing method of the TFT, and manufacturing method of the flat panel display |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/641,277 Continuation US8043887B2 (en) | 2004-12-23 | 2009-12-17 | Thin film transistor, flat panel display including the thin film transistor, and method for manufacturing the thin film transistor and the flat panel display |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060138405A1 true US20060138405A1 (en) | 2006-06-29 |
Family
ID=36075536
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/298,211 Abandoned US20060138405A1 (en) | 2004-12-23 | 2005-12-09 | Thin film transistor, flat panel display including the thin film transistor, and method for manufacturing the thin film transistor and the flat panel display |
US12/641,277 Active US8043887B2 (en) | 2004-12-23 | 2009-12-17 | Thin film transistor, flat panel display including the thin film transistor, and method for manufacturing the thin film transistor and the flat panel display |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/641,277 Active US8043887B2 (en) | 2004-12-23 | 2009-12-17 | Thin film transistor, flat panel display including the thin film transistor, and method for manufacturing the thin film transistor and the flat panel display |
Country Status (6)
Country | Link |
---|---|
US (2) | US20060138405A1 (en) |
EP (1) | EP1675196B1 (en) |
JP (1) | JP4504877B2 (en) |
KR (1) | KR100670255B1 (en) |
CN (1) | CN1819299B (en) |
DE (1) | DE602005019839D1 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060160280A1 (en) * | 2005-01-15 | 2006-07-20 | Suh Min-Chul | Thin film transistor, a method for preparing the same and a flat panel display employing the same |
US20070241331A1 (en) * | 2006-04-12 | 2007-10-18 | Au Optronics Corp. | Electroluminescent device and methods for fabricating the same |
US20080099760A1 (en) * | 2006-10-31 | 2008-05-01 | Hitachi, Ltd. | Picture element driving circuit of display panel and display device using the same |
US20080121872A1 (en) * | 2006-03-22 | 2008-05-29 | Samsung Electronics Co., Ltd. | Display apparatus and method of manufacturing thereof |
US20090224248A1 (en) * | 2008-03-04 | 2009-09-10 | Samsung Electronics Co., Ltd. | Display device and manufacturing method thereof |
CN101740631A (en) * | 2008-11-07 | 2010-06-16 | 株式会社半导体能源研究所 | Semiconductor device and method for manufacturing the semiconductor device |
US8138075B1 (en) | 2006-02-06 | 2012-03-20 | Eberlein Dietmar C | Systems and methods for the manufacture of flat panel devices |
US20120220077A1 (en) * | 2008-07-08 | 2012-08-30 | Samsung Mobile Display Co., Ltd. | Thin film transistor, method of manufacturing the same and flat panel display device having the same |
US20220045274A1 (en) * | 2020-08-06 | 2022-02-10 | Facebook Technologies Llc | Ofets having organic semiconductor layer with high carrier mobility and in situ isolation |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20070053060A (en) * | 2005-11-19 | 2007-05-23 | 삼성전자주식회사 | Display device and manufacturing method thereof |
KR100787438B1 (en) * | 2005-12-12 | 2007-12-26 | 삼성에스디아이 주식회사 | Organic thin film transistor, method of manufacuring the same, and organic light emitting display apparatus comprising the same |
JP2008034578A (en) * | 2006-07-28 | 2008-02-14 | Sony Corp | Semiconductor device, and its fabrication process |
CN101325219B (en) * | 2007-06-15 | 2010-09-29 | 群康科技(深圳)有限公司 | Thin-film transistor substrate and manufacturing method thereof |
JP4589373B2 (en) * | 2007-10-29 | 2010-12-01 | 株式会社リコー | Organic transistor, organic transistor array and display device |
KR101183964B1 (en) * | 2008-08-11 | 2012-09-19 | 한국전자통신연구원 | The method for locally crystallizing organic thin film and method for fabricating organic thin film transistor using the same |
KR101084198B1 (en) * | 2010-02-24 | 2011-11-17 | 삼성모바일디스플레이주식회사 | Organic light emitting display device |
JP5659567B2 (en) * | 2010-06-11 | 2015-01-28 | 富士ゼロックス株式会社 | Organic transistor and method for manufacturing organic transistor |
CN102723307A (en) * | 2011-03-30 | 2012-10-10 | 京东方科技集团股份有限公司 | Preparation method of array substrate and TFT structure |
CN102504213B (en) * | 2011-11-15 | 2013-08-28 | 上海交通大学 | Soluble benzenetetracarboxylic diimide group-containing full-conjugated polymer and preparation method thereof |
GB2515750B (en) * | 2013-07-01 | 2017-11-15 | Flexenable Ltd | Supressing Leakage Currents in a Multi - TFT Device |
JP2015019000A (en) * | 2013-07-12 | 2015-01-29 | ソニー株式会社 | Electronic device and manufacturing method thereof, and image display device and substrate constituting image display device |
KR102550604B1 (en) * | 2016-08-03 | 2023-07-05 | 삼성디스플레이 주식회사 | Semiconductor device and manufacturing method of the same |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6498114B1 (en) * | 1999-04-09 | 2002-12-24 | E Ink Corporation | Method for forming a patterned semiconductor film |
US20030047729A1 (en) * | 2001-09-05 | 2003-03-13 | Konica Corporation | Organic thin-film semiconductor element and manufacturing method for the same |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3246189B2 (en) * | 1994-06-28 | 2002-01-15 | 株式会社日立製作所 | Semiconductor display device |
WO2001008241A1 (en) * | 1999-07-21 | 2001-02-01 | E Ink Corporation | Reactive formation of dielectric layers and protection of organic layers in organic semiconductor device |
JP2003508797A (en) * | 1999-08-24 | 2003-03-04 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Display device |
WO2001097297A1 (en) * | 2000-06-16 | 2001-12-20 | The Penn State Research Foundation | Aqueous-based photolithography on organic materials |
US6720198B2 (en) * | 2001-02-19 | 2004-04-13 | Semiconductor Energy Laboratory Co., Ltd. | Light emitting device and manufacturing method thereof |
JP2005079203A (en) * | 2003-08-28 | 2005-03-24 | Canon Inc | Field effect transistor and its manufacturing method |
US6969634B2 (en) * | 2003-09-24 | 2005-11-29 | Lucent Technologies Inc. | Semiconductor layers with roughness patterning |
KR100592278B1 (en) * | 2004-06-08 | 2006-06-21 | 삼성에스디아이 주식회사 | Thin film transistor and flat panel display device having same |
-
2004
- 2004-12-23 KR KR1020040111097A patent/KR100670255B1/en active IP Right Grant
-
2005
- 2005-06-29 JP JP2005190559A patent/JP4504877B2/en active Active
- 2005-12-09 US US11/298,211 patent/US20060138405A1/en not_active Abandoned
- 2005-12-20 DE DE602005019839T patent/DE602005019839D1/en active Active
- 2005-12-20 EP EP05112462A patent/EP1675196B1/en active Active
- 2005-12-23 CN CN2005101358490A patent/CN1819299B/en active Active
-
2009
- 2009-12-17 US US12/641,277 patent/US8043887B2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6498114B1 (en) * | 1999-04-09 | 2002-12-24 | E Ink Corporation | Method for forming a patterned semiconductor film |
US20030047729A1 (en) * | 2001-09-05 | 2003-03-13 | Konica Corporation | Organic thin-film semiconductor element and manufacturing method for the same |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060160280A1 (en) * | 2005-01-15 | 2006-07-20 | Suh Min-Chul | Thin film transistor, a method for preparing the same and a flat panel display employing the same |
US7671359B2 (en) * | 2005-01-15 | 2010-03-02 | Samsung Mobile Display Co., Ltd. | Thin film transistor, a method for preparing the same and a flat panel display employing the same |
US8138075B1 (en) | 2006-02-06 | 2012-03-20 | Eberlein Dietmar C | Systems and methods for the manufacture of flat panel devices |
US20080121872A1 (en) * | 2006-03-22 | 2008-05-29 | Samsung Electronics Co., Ltd. | Display apparatus and method of manufacturing thereof |
US7824952B2 (en) * | 2006-03-22 | 2010-11-02 | Samsung Electronics Co., Ltd. | Display apparatus and method of manufacturing thereof |
US20070241331A1 (en) * | 2006-04-12 | 2007-10-18 | Au Optronics Corp. | Electroluminescent device and methods for fabricating the same |
US20080099760A1 (en) * | 2006-10-31 | 2008-05-01 | Hitachi, Ltd. | Picture element driving circuit of display panel and display device using the same |
US20090224248A1 (en) * | 2008-03-04 | 2009-09-10 | Samsung Electronics Co., Ltd. | Display device and manufacturing method thereof |
US7834348B2 (en) | 2008-03-04 | 2010-11-16 | Samsung Electronics Co., Ltd. | Display device and manufacturing method thereof |
US20120220077A1 (en) * | 2008-07-08 | 2012-08-30 | Samsung Mobile Display Co., Ltd. | Thin film transistor, method of manufacturing the same and flat panel display device having the same |
US8728862B2 (en) * | 2008-07-08 | 2014-05-20 | Samsung Display Co., Ltd. | Thin film transistor, method of manufacturing the same and flat panel display device having the same |
CN101740631A (en) * | 2008-11-07 | 2010-06-16 | 株式会社半导体能源研究所 | Semiconductor device and method for manufacturing the semiconductor device |
US20220045274A1 (en) * | 2020-08-06 | 2022-02-10 | Facebook Technologies Llc | Ofets having organic semiconductor layer with high carrier mobility and in situ isolation |
Also Published As
Publication number | Publication date |
---|---|
KR20060072451A (en) | 2006-06-28 |
US8043887B2 (en) | 2011-10-25 |
JP4504877B2 (en) | 2010-07-14 |
KR100670255B1 (en) | 2007-01-16 |
JP2006179855A (en) | 2006-07-06 |
EP1675196A1 (en) | 2006-06-28 |
CN1819299B (en) | 2013-01-30 |
CN1819299A (en) | 2006-08-16 |
DE602005019839D1 (en) | 2010-04-22 |
US20100099215A1 (en) | 2010-04-22 |
EP1675196B1 (en) | 2010-03-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8043887B2 (en) | Thin film transistor, flat panel display including the thin film transistor, and method for manufacturing the thin film transistor and the flat panel display | |
US7442960B2 (en) | TFT, method of manufacturing the TFT, flat panel display having the TFT, and method of manufacturing the flat panel display | |
JP4472664B2 (en) | Flat panel display | |
JP4652951B2 (en) | ORGANIC LIGHT EMITTING ELEMENT AND METHOD FOR PRODUCING THE ORGANIC LIGHT EMITTING ELEMENT | |
US8222631B2 (en) | Organic thin film transistor and flat display device having the same | |
KR100768199B1 (en) | Organic thin film transistor and organic light emitting display device comprising the same | |
JP4358152B2 (en) | Thin film transistor and flat panel display having the same | |
US8227795B2 (en) | Organic thin film transistor, flat panel display apparatus having the same, and a method of manufacturing organic thin film transistor | |
JP4455517B2 (en) | Thin film transistor manufacturing method | |
US20050269562A1 (en) | Thin film transistor (TFT) and flat display panel having the thin film transistor (TFT) | |
CN101924140B (en) | Thin film transistor and flat panel display including the same | |
JP2006253675A (en) | Organic thin film transistor and flat panel display device comprising it | |
US8076733B2 (en) | Flat panel display device having an organic thin film transistor and method of manufacturing the same | |
US20060255336A1 (en) | Thin film transistor and method of manufacturing the same | |
JP2006270093A (en) | Organic thin film transistor, flat panel display provided with the same, and manufacturing method of organic thin film transistor | |
KR100647603B1 (en) | A thin film transistor and a flat panel display therewith | |
KR20070080705A (en) | Method of manufacturing thin film transistor, thin film transistor manufactured by the method, and display device using the same | |
KR100683800B1 (en) | Organic light emitting display apparatus | |
KR100592270B1 (en) | Thin film transistor and flat panel display device having same | |
KR100719567B1 (en) | Flat display device and manufacturing method thereof |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SAMSUNG SDI CO., LTD., KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YANG, NAM-CHOUL;KIM, HYE-DONG;SUH, MIN-CHUL;AND OTHERS;REEL/FRAME:017352/0074 Effective date: 20051208 |
|
AS | Assignment |
Owner name: SAMSUNG MOBILE DISPLAY CO., LTD., KOREA, REPUBLIC Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SAMSUNG SDI CO., LTD.;REEL/FRAME:022552/0192 Effective date: 20081209 Owner name: SAMSUNG MOBILE DISPLAY CO., LTD.,KOREA, REPUBLIC O Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SAMSUNG SDI CO., LTD.;REEL/FRAME:022552/0192 Effective date: 20081209 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |