WO2006033282A1 - 薄膜トランジスタと薄膜トランジスタ素子シート、及び、薄膜トランジスタと薄膜トランジスタ素子シートの作製方法 - Google Patents
薄膜トランジスタと薄膜トランジスタ素子シート、及び、薄膜トランジスタと薄膜トランジスタ素子シートの作製方法 Download PDFInfo
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- WO2006033282A1 WO2006033282A1 PCT/JP2005/017061 JP2005017061W WO2006033282A1 WO 2006033282 A1 WO2006033282 A1 WO 2006033282A1 JP 2005017061 W JP2005017061 W JP 2005017061W WO 2006033282 A1 WO2006033282 A1 WO 2006033282A1
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- WIPO (PCT)
- Prior art keywords
- thin film
- film transistor
- electrode
- insulating region
- layer
- Prior art date
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- 229920001088 polycarbazole Polymers 0.000 description 1
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- 239000004431 polycarbonate resin Substances 0.000 description 1
- 125000003367 polycyclic group Chemical group 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
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- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
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- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- GGVMPKQSTZIOIU-UHFFFAOYSA-N quaterrylene Chemical group C12=C3C4=CC=C2C(C2=C56)=CC=C5C(C=57)=CC=CC7=CC=CC=5C6=CC=C2C1=CC=C3C1=CC=CC2=CC=CC4=C21 GGVMPKQSTZIOIU-UHFFFAOYSA-N 0.000 description 1
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- 239000003381 stabilizer Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- 238000003756 stirring Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 229910002029 synthetic silica gel Inorganic materials 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 125000001302 tertiary amino group Chemical group 0.000 description 1
- RIQXSPGGOGYAPV-UHFFFAOYSA-N tetrabenzo(a,c,l,o)pentacene Chemical compound C1=CC=CC2=C(C=C3C(C=C4C=C5C6=CC=CC=C6C=6C(C5=CC4=C3)=CC=CC=6)=C3)C3=C(C=CC=C3)C3=C21 RIQXSPGGOGYAPV-UHFFFAOYSA-N 0.000 description 1
- 150000000000 tetracarboxylic acids Chemical class 0.000 description 1
- IFLREYGFSNHWGE-UHFFFAOYSA-N tetracene Chemical compound C1=CC=CC2=CC3=CC4=CC=CC=C4C=C3C=C21 IFLREYGFSNHWGE-UHFFFAOYSA-N 0.000 description 1
- PCCVSPMFGIFTHU-UHFFFAOYSA-N tetracyanoquinodimethane Chemical compound N#CC(C#N)=C1C=CC(=C(C#N)C#N)C=C1 PCCVSPMFGIFTHU-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- LFQCEHFDDXELDD-UHFFFAOYSA-N tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- ILJSQTXMGCGYMG-UHFFFAOYSA-N triacetic acid Chemical compound CC(=O)CC(=O)CC(O)=O ILJSQTXMGCGYMG-UHFFFAOYSA-N 0.000 description 1
- PYJJCSYBSYXGQQ-UHFFFAOYSA-N trichloro(octadecyl)silane Chemical compound CCCCCCCCCCCCCCCCCC[Si](Cl)(Cl)Cl PYJJCSYBSYXGQQ-UHFFFAOYSA-N 0.000 description 1
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 1
- 239000013638 trimer Substances 0.000 description 1
- 125000003960 triphenylenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3C3=CC=CC=C3C12)* 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 239000003232 water-soluble binding agent Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- 239000011667 zinc carbonate Substances 0.000 description 1
- 229910000010 zinc carbonate Inorganic materials 0.000 description 1
- 235000004416 zinc carbonate Nutrition 0.000 description 1
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 1
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
- 229940007718 zinc hydroxide Drugs 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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
- H10K71/10—Deposition of organic active material
- H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
- H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing
- H10K71/135—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing using ink-jet printing
-
- 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 potential barriers
- 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
- H10K19/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic element specially adapted for rectifying, amplifying, oscillating or switching, covered by group H10K10/00
- H10K19/10—Integrated devices, or assemblies of multiple devices, comprising at least one organic element specially adapted for rectifying, amplifying, oscillating or switching, covered by group H10K10/00 comprising field-effect transistors
Definitions
- the present invention relates to a thin film transistor and a thin film transistor element sheet.
- a display medium is formed by using an element utilizing liquid crystal, organic EL, electrophoresis or the like.
- display media in order to ensure uniformity of screen brightness, screen rewriting speed, etc., the technology that uses active drive elements composed of thin film transistors (TFTs) as image drive elements has become the mainstream!
- TFTs thin film transistors
- a TFT element is usually formed on a glass substrate mainly by a semiconductor thin film such as a-Si (amorphous silicon) or p-Si (polysilicon), or a metal thin film such as a source, drain, or gate electrode.
- a semiconductor thin film such as a-Si (amorphous silicon) or p-Si (polysilicon)
- a metal thin film such as a source, drain, or gate electrode.
- the manufacture of flat panel displays using TFTs usually requires high-precision photolithographic processes in addition to vacuum system facilities such as CVD and sputtering and thin film formation processes that require high-temperature processing processes.
- the load is very large. Furthermore, along with the recent needs for larger display screens, their costs have become enormous.
- Patent Document 1 JP-A-10-190001
- Patent Document 2 Pamphlet of International Publication No. 01Z47043
- Non-Patent Literature 1 Advanced Material 2002, No. 2, page 99 (Review)
- Non-Patent Literature 2 SID '02 Digest p57
- An object of the present invention is to provide a thin film transistor and a thin film transistor element sheet that have a low channel length, a high performance, a low performance, and a thin film transistor element sheet, and an electric circuit having these thin film transistors, It is an object of the present invention to provide a simple and efficient method for producing them without using a complicated, expensive, low-productivity vacuum system, or photolithography.
- the present inventor uses an electrostatic suction type ink jet apparatus having a nozzle inner diameter of 30 m or less to form an insulating region with a material having electrode material repellent property so as to straddle the insulating region. Focusing on the fact that the width of the insulating region, which is the channel length of the TFT, can be accurately regulated by separating the formed source electrode and drain electrode (also referred to as the SD electrode).
- the inventors of the present invention have come up with the present invention considering the formation of the droplets by the volume and the discharge amount (drawing density) of the electrostatic attraction type ink jet apparatus that discharges the droplets.
- Configuration 4 The thin film transistor according to any one of configurations 1 to 3, wherein the source electrode and the drain electrode are formed by a step of supplying the fluid electrode material to a receiving layer.
- Structure 5 The thin film transistor according to any one of structures 1 to 4, wherein the insulating region is formed on the semiconductor layer by the step of forming the insulating region on the semiconductor layer.
- a thin film transistor element force S having a channel region composed of a gate electrode, a gate insulating layer, and a semiconductor layer, a source electrode, and a drain electrode on a support, and a plurality of gates through a gate bus line and a source bus line.
- a fluid electrode material is supplied onto the channel region or the support directly or via another layer, and the fluid electrode material is divided by the insulating region.
- a method for manufacturing a thin film transistor element sheet comprising a step of forming at least the source electrode and the drain electrode.
- the drain electrode forms a pixel electrode, or the drain electrode is connected to the pixel electrode, and the pixel electrode and the source bus line are separated by the insulating region. 14.
- (Structure 15) The method for producing a thin film transistor element sheet according to any one of Structures 11 to 14, wherein the fluid electrode material is supplied by the electrostatic suction ink jet apparatus.
- (Configuration 16) The method for producing a thin film transistor element sheet according to any one of configurations 11 to 15, wherein the semiconductor layer contains an organic semiconductor material.
- FIG. 3 is a cross-sectional view of a recording head having nozzles and members related to the recording head.
- FIG. 5 is a diagram for explaining a method for manufacturing a thin film transistor of the present invention.
- FIG. 6 A schematic view showing an example of forming an insulating region on an organic semiconductor layer by the electrostatic suction type ink jet device of the present invention.
- FIG. 7 is a schematic view showing an example of forming a source / drain electrode by an inkjet method.
- FIG. 8 is a schematic view showing another example of forming a source / drain electrode by an inkjet method.
- FIG. 9 is an explanatory diagram of one embodiment of a manufacturing process of a thin film transistor element of the thin film transistor element sheet of the present invention by an inkjet method.
- FIG. 10 is an equivalent circuit diagram showing an embodiment of a thin film transistor element sheet in which a plurality of thin film transistor elements of the present invention are arranged.
- FIG. 11 is a schematic view showing an embodiment of an organic thin film transistor forming one pixel of the thin film transistor element sheet of the present invention.
- FIG. 16 is a structural diagram of a thin film transistor element. BEST MODE FOR CARRYING OUT THE INVENTION
- the organic thin film transistor of the present invention is roughly classified into a bottom gate type and a top gate type.
- a gate electrode is provided on a support directly or through another layer such as an undercoat layer, and then a source electrode and a drain connected by an organic semiconductor layer through a gate insulating layer. It has a layer structure that also has electrode force.
- the top gate type has a layer structure in which a source electrode and a drain electrode in contact with an organic semiconductor layer are provided on a support, and a gate electrode is provided thereon via a gate insulating layer.
- FIG. 1 illustrates an example of a layer structure of a bottom-gate thin film transistor.
- FIGS. 1 (a) to 1 (c) are examples of bottom gate type layer configurations.
- a gate electrode 2 is formed on a support 1, and a gate insulating layer is formed on the gate electrode 2.
- 2a an organic semiconductor layer 3 and an insulating region 6 having electrode material repulsion (hereinafter also simply referred to as insulating region 6) are provided on the gate insulating layer 2a, and source electrodes are provided on both sides of the insulating region 6. 5 and a drain electrode 4 are provided.
- FIG. 1 (b) shows another example of a bottom gate type layer structure.
- a receiving layer 7 (for example, an ink receiving layer) is provided on the organic semiconductor layer 3.
- an insulating region 6 having electrode material repellent properties and a source electrode on both sides of the insulating region 6 are provided.
- the configuration is the same as that shown in FIG. 1 (a) except that 5 and the drain electrode 4 are provided.
- FIG. 1 (c) shows another example of the bottom gate type layer structure. It is shown in Fig. 1 (a) except that an organic semiconductor protective layer (also referred to as an intermediate layer) 3a is provided between the organic semiconductor layer 3 and the insulating material 6 having repulsive properties. It is the same configuration as the configuration.
- the organic semiconductor protective layer 3a is made of a material that forms the insulating region 6 (not shown). It is provided to reduce the chemical and physical effects on the semiconductor layer.
- FIG. 2 is an example of a layer structure example of a top-gate thin film transistor.
- FIG. 2 shows an example of a top gate type layer structure, in which an insulating region 6 having electrode material repellent property is provided on a support 1, and a source electrode 5 and a drain electrode 4 are formed on both sides of the insulating region 6.
- the organic semiconductor layer 3 is provided so as to be connected to the source electrode 5 and the drain electrode 4, and the gate insulating layer 2a and the gate electrode 2 are provided on the organic semiconductor layer 3. ing.
- an inkjet apparatus electrostatic suction type liquid discharge apparatus having at least a gate electrode, a semiconductor layer, a source electrode, and a drain electrode on a support and having a nozzle inner diameter of 1 to 20 m is provided.
- an insulating region having an electrode material repellent property, and then supplying a fluid electrode material to the insulating region, and the fluid electrode material is divided at the insulating region, whereby the source A structure of each layer of a thin film transistor, which is manufactured through a process of forming each of the electrode and the drain electrode, will be described with reference to FIG.
- the electrostatic suction type liquid ejecting apparatus described above is capable of continuously ejecting an ink flow having a diameter substantially the same as the diameter in the direction perpendicular to the ejection direction of droplets of 1 to 400 fl per droplet.
- an electrostatic suction type liquid discharge device having such a two-pattern discharge function is also referred to as an electrostatic suction type ink jet device.
- this electrostatic suction type ink jet device can more effectively utilize the local electric field concentration effect that the nozzle diameter is smaller than that of a normal ink jet device. Is possible.
- ink is ejected as droplets
- the continuous ejection function is used, and the droplets have substantially the same diameter and unit area. It is also possible to form an insulating region having electrode material repellent properties by continuously ejecting the same amount of ink per hit.
- this continuous discharge reduces the unevenness of the edge shape of the landed ink when a straight line is formed.
- the width of the insulating region which is the channel length of the TFT, is reduced. It can be regulated well and is suitable.
- Insulating region having electrode material repulsion >> The insulating region 6 having the repulsion property of the electrode material containing silicon rubber according to the present invention will be described.
- an insulating region having electrode material repellent property has a performance of repelling an electrode material that becomes an electrode (specifically, a source electrode or a drain electrode).
- the insulating region is formed on the (organic) semiconductor layer by the step of forming the insulating region on the semiconductor layer.
- the top gate type it is formed by patterning directly on the support or on another layer (such as an undercoat layer).
- any means can be used as a patterning means as long as it can perform the turning, but the influence on the organic semiconductor layer described later is minimized. From the viewpoint of suppression, among the preferred wet processes such as printing, the inkjet method is particularly preferred.
- the ink jet method a known ink jet such as a piezo method can be used. From the viewpoint of drawing a fine pattern, an electrostatic attraction type ink jet device that discharges extremely fine droplets can be used. Particularly preferred.
- the insulating region 6 is formed by the electrostatic suction type ink jet device, it is preferable to provide a receiving layer described later from the viewpoint of adjusting the formation region by ink discharge to an appropriate size.
- the droplets can be prevented from spreading by being dried or cured after being absorbed and held in the receiving layer.
- the insulating region having electrode material repellent properties is formed by supplying an insulating region forming material to the (ink) receiving layer.
- a void type receiving layer described later which is used for conventionally known ink jet recording media, is preferably used.
- any material may be used as long as it has a performance of repelling the electrode material.
- a forming material such as a flat, waterless flat ink repellent layer can be used, or a silane coupling agent, a titanate coupling agent, a silicon polymer adhesive, or the like can be used. May be.
- a silane coupling agent such as a silane coupling agent, a titanate coupling agent, a silicon polymer adhesive, or the like can be used. May be.
- lipophilic materials such as phenol and epoxy resins.
- silicon rubber or the like is used.
- the silicon rubber (layer) which is the receiving layer and the insulating region 6 having electrode material repellent property can be appropriately selected from known materials as described in JP-A-7-164773 and the like.
- the condensation-crosslinking type silicon rubber includes a linear organopolysiloxane having hydroxyl groups at both ends and a reactive silane compound that crosslinks with the organopolysiloxane to form a silicon rubber layer as essential components. Can be mentioned.
- Condensation-crosslinking type silicon rubber is used to increase the reaction efficiency of the condensation-crosslinking reaction between the organopolysiloxane having hydroxyl groups at both ends and a reactive silane compound.
- Condensation catalysts such as esters, aluminum organic ethers, and platinum-based catalysts can be mixed as appropriate to perform a condensation reaction and cure.
- the blending ratio of the organopolysiloxane having hydroxyl groups at both ends, the reactive silane compound and the condensation catalyst in the silicon rubber is such that the organopolysiloxane having hydroxyl groups at both ends with respect to the solid content of the entire silicon rubber.
- Siloxane is 80 to 98% by mass, preferably 85 to 98% by mass
- reactive silane compound strength is usually 2 to 20% by mass, preferably 2 to 15% by mass, more preferably 2 to 7% by mass
- the condensation catalyst is 0. 05 to 5% by mass, preferably 0.1 to 3% by mass, and more preferably 0.1 to 1% by mass.
- polysiloxane other than the polyorganosiloxane having a hydroxyl group at both ends is added to the total solid content of the silicone rubber. 2 to 15 weight 0/0, preferably 3-12 mass 0/0 can be contained.
- the polysiloxane include M wlO, 000 to 1,000,000 positive dimethylolene P-xane, which is trimethylsilylated at both ends.
- an addition-crosslinking type silicone rubber comprises an organopolysiloxane having at least two aliphatic unsaturated groups in one molecule, and a silicone rubber layer crosslinked with the organopolysiloxane. And an organopolysiloxane having at least two Si—H bonds in one molecule as an essential component.
- the structure of the organopolysiloxane having at least two aliphatic unsaturated groups in one molecule may be any of a chain, a ring, and a branch, but a chain is preferable.
- aliphatic unsaturated groups include alkenyl groups such as butyl, allyl, butenyl, pentenyl, hexyl, etc .; cyclopentyl, cyclohexenyl, cycloheptyl, cyclooctane
- a cycloalkyl group such as a group; an alkynyl group such as an ethur group, a propylene group, a propyl group, a pentynyl group, and a hexyl group.
- the bulle group is particularly preferred, which is preferably a alkenyl group having an unsaturated bond at the end of the reactive point.
- the remaining substituents other than the aliphatic unsaturated groups are preferably methyl groups in order to obtain good ink repellency.
- the Mw of the organopolysiloxane having at least two aliphatic unsaturated groups in one molecule is usually 500 to 500,000, and preferably ⁇ 1,000 to 3,000,000.
- the organopolysiloxane having at least two Si-H bonds in one molecule may be any of a chain structure, a cyclic structure, and a branched structure, but a chain structure is preferable.
- the ratio of hydrogen atoms to the total number of substituents which may be at the terminal or the middle of the siloxane skeleton is usually 1 to 60%, preferably 2 to 50%.
- the remaining substituents other than hydrogen atoms are preferably methyl groups in order to obtain good ink repellency.
- the Mw of the organopolysiloxane having at least two Si—H bonds in one molecule is usually 300 to 300,000, preferably 500 to 200,000. Mw force is remarkably high! /, And it tends to decrease sensitivity and image reproducibility.
- an addition reaction catalyst is usually used.
- the addition reaction catalyst can be arbitrarily selected from known ones, but one or a mixture of two or more selected from platinum group metals and platinum group compounds preferred by platinum-based catalysts is used.
- platinum group metal examples include platinum alone (eg, platinum black), palladium alone (eg, palladium black), rhodium alone, and the like.
- Platinum group compounds include platinum chloride. Examples include acids, platinum-olefin complexes, platinum alcohol complexes, platinum-ketone complexes, platinum and vinylsiloxane complexes, tetrakis (triphenylphosphine) platinum, tetrakis (triphenylphosphine) palladium, and the like. Of these, those obtained by dissolving chloroplatinic acid or platinum-olefin complexes in alcohol solvents, ketone solvents, ether solvents, hydrocarbon solvents, etc. are particularly preferred.
- the composition ratio of each composition forming the above-mentioned silicon rubber (layer) is an organopolysiloxane chain having at least two aliphatic unsaturated groups in one molecule with respect to the total solid content of the silicon rubber. 80 to 98 weight 0/0, preferably from 85 to 98 wt%, the organopolysiloxane force 2-20 wt% with two even without Si- H bonds and small in the molecule, preferably 2 to 15 wt% And the addition reaction catalyst is 0.0001 to 10% by mass, preferably 0.0001 to 5% by mass.
- addition-crosslinking type silicon rubber used in the present invention is not limited to those described in JP-A-10-244773 for the purpose of increasing the film strength of the silicon rubber (layer).
- An amino-based organosilicon compound having a hydrolyzable group represented by the formula (VII) can be added.
- the Amino organic Kei-containing compound is from 0 to the total solid content of the silicone rubber: LO mass 0/0, preferably from 0 to 5 wt%.
- a curing retarder can be added to the addition-crosslinking type silicone rubber for the purpose of preventing rapid curing of the silicone composition when the silicone rubber (layer) is applied.
- the curing retarder is arbitrarily selected from generally known acetylenic alcohols, maleic acid esters, silylated products of acetylenic alcohols, silylated products of maleic acid, triallyl isocyanurate, vinyl siloxane, etc. be able to.
- the amount of the curing retarder added varies depending on the desired curing rate, and is usually 0.0001-1. 0 parts by mass with respect to the total solid content of the silicone rubber.
- the film thickness of the silicon rubber (layer) used in the present invention is from 0.1 to: LO / z m, preferably 0.
- the thickness is 2 to 5 ⁇ m, more preferably 0.3 to 2 ⁇ m.
- the silicone rubber composition is dissolved in an appropriate solvent to form a solution, and after coating (patterning),
- Ethers such as methyl mouth solve, ethyl mouth sorb, tetrahydrofuran, etc., and also mixed solvents with propylene glycol monomethyl ether acetate, bentoxone, dimethylformamide, and the like.
- the insulating region 6 according to the present invention preferably has a light transmittance of 10% or less, more preferably 1% or less. As a result, it is possible to suppress deterioration of the characteristics of the organic semiconductor layer 3 due to light.
- the light transmittance refers to an average transmittance in a wavelength region in which photo-generated carriers can be generated in the organic semiconductor layer 3. Generally, it is preferable to have the ability to block light of 350 to 750 nm.
- the light transmittance is reduced in the insulating region 6.
- the light transmittance of the other layers such as the intermediate layer 3a, the receiving layer 7 and the like that can be formed on the organic semiconductor layer alone may be 1% or less. More preferably, it is set to not more than%.
- the layer contains a colorant such as a pigment or a dye or an ultraviolet absorber, the following method can be used.
- an ink jet device having a capacity per droplet of several pi to several tens of pi is used to form the insulating region 6 having electrode material repellent properties, ink droplets that land on the recording medium
- the dot diameter has reached several tens of ⁇ m (for example, in the case of 20pl, the dot diameter is 60 ⁇ m), for example, a thin film transistor that requires a channel length (insulating region width) of 10 ⁇ m or less. It was unsuitable for the formation of the insulating region of the jitter.
- the ink jet device that forms the insulating region 6 having electrode material repellent properties enables the formation of a channel length (for example, 3 ⁇ m) necessary for the insulating region.
- the electrostatic suction type ink jet apparatus according to the present invention is used which can eject liquid droplets having an extremely fine diameter which is equal to or less than the diameter channel length.
- an object an organic semiconductor layer in the present invention to which inkjet droplets adhere is also simply referred to as a substrate.
- Ink jet apparatus capable of discharging droplets with extremely fine diameters that form insulating region 6 having repulsion property of electrode material has a capacity of 1 to 400 fl, preferably 1 to: LOO
- An electrostatic suction type inkjet apparatus of fl is suitable and will be described in detail below. (Structure of recording head and members related to recording head)
- the recording head 20 and the members related to the recording head 20 of the electrostatic attraction type ink jet apparatus that can eject liquid droplets of extremely fine diameters used for forming the insulating region of the thin film transistor of the present invention are shown in FIGS. This will be explained based on.
- FIG. 3 is a cross-sectional view of a recording head having nozzles and members related to the recording head
- FIG. 4 is an explanatory diagram showing the relationship between the ink ejection operation and the voltage applied to the ink.
- FIG. 4 (A) shows a state where no discharge is performed
- FIG. 4 (B) shows a discharge state
- the recording head 20 is provided with an ultrafine nozzle 21 that discharges ink droplets of chargeable ink from its tip.
- a counter electrode 23 is provided below the nozzle 21 of the recording head 20 so as to face the nozzle 21, and the counter electrode 23 has a counter surface facing the tip portion of the nozzle 21 and its counter surface.
- the thin film transistor K that receives ink droplets is supported.
- the recording head 20 includes an ink supply unit that supplies ink to the flow path (flow path in the nozzle) 22 in the nozzle 21, and a discharge voltage application unit 25 that applies a discharge voltage to the ink in the nozzle 21. It is connected.
- nozzle 21 and the ink supply unit and a part of the discharge voltage application unit 25 are provided. This configuration is integrally formed by the nozzle plate 26.
- the recording head 20 is a scanning type recording head that can be scanned in a direction (front and back direction in the figure) orthogonal to the conveyance direction (left and right direction in the figure) of the thin film transistor K by a driving mechanism (not shown).
- Insulating discharge liquid having electrode material repellent property hereinafter, the insulating discharge liquid is also referred to as ink
- the recording head 20 is a nozzle 21 as ink droplets. Discharge from.
- the nozzle 21 is integrally formed with a lower surface layer 26c of the nozzle plate 26, which will be described later, and is erected vertically from the flat plate surface of the nozzle plate 26. Further, the nozzle 21 is formed with a flow path 22 through which the tip force penetrates along the center line.
- the nozzle 21 is formed with an ultrafine diameter. Specifically, the inner diameter d at the tip A of the nozzle 21 is 30 m or less. As an example of specific dimensions, the nozzle inner diameter d is 1 m, the outer diameter d at the tip of the nozzle 21 is 2 ⁇ m, the root diameter of the nozzle 21 d «5 ⁇ m, the height of the nozzle 21 h is set to 100 / zm and its shape is endlessly conical
- the entire nozzle 21 is formed of an insulating grease material together with the lower surface layer 26c of the nozzle plate 26.
- each dimension of the nozzle is not limited to the above example.
- the nozzle inner diameter d is within a range in which the discharge voltage enabling discharge of ink droplets to be less than 1 000 V due to the effect of electric field concentration described later, for example, when the electrostatic force exceeds the surface tension. Since the upper limit of the nozzle inner diameter is approximately 30 ⁇ m, the upper limit value of the nozzle inner diameter is preferably 30 ⁇ m. In particular, 15 / zm is more preferable. In particular, in order to more effectively use the local electric field concentration effect, the nozzle inner diameter is preferably in the range of 0.01 to 8 / ⁇ ⁇ . Further, it is preferable that the volume per droplet discharged from the nozzle described above is 1 to 400 fl (10 _15 l).
- the ink supply means is provided inside the nozzle plate 26 at a position that is the base of the nozzle 21 and communicates with the nozzle internal flow path 22, and an external ink tank force (not shown) is also applied to the ink chamber 24.
- an external ink tank force (not shown) is also applied to the ink chamber 24.
- Connected to the ink supply path 27 that guides ink and the ink supply path 27 Provided with a supply pump (not shown) that applies ink supply pressure to the ink chamber 24! /
- Ink is stored in the external ink tank, and the supply pump is connected to the nozzle 2
- Ink is supplied to the tip of 1 and the supply pressure is maintained within a range that does not spill from the tip (see Fig. 4 (A)).
- a bias power supply 30 that constantly applies a DC bias voltage to a discharge electrode 28 for discharge voltage application provided in the boundary position between the ink chamber 24 and the nozzle flow path 22 inside the nozzle plate 26;
- An ejection voltage applying means 25 having an ejection voltage power supply 29 for applying a pulse voltage which is a potential required for ejection superimposed on a bias voltage is connected to the ejection electrode 28.
- the discharge electrode 28 is in direct contact with the ink inside the ink chamber 24 to charge the ink and apply a discharge voltage.
- the bias voltage from the bias power source 30 is applied in a voltage range where ink is not discharged, so that the width of the voltage to be applied during discharge is reduced in advance. The responsiveness is improved.
- the ejection voltage power supply 29 applies the pulse voltage superimposed on the bias voltage only when ejecting ink.
- the superimposed voltage V at this time is set to the value of the Norse voltage so that the following equation is satisfied.
- ⁇ surface tension of ink
- ⁇ dielectric constant of vacuum
- r nozzle radius
- k depending on nozzle shape
- the bias voltage is applied at DC 300 [V] and the pulse voltage is marked at 100 [V].
- the superimposed voltage during ejection is 400 [V].
- the nozzle plate 26 has a base layer 26a located at the uppermost layer in FIG. A flow path layer 26b that forms an ink supply path, and a lower surface layer 26c that is formed further below the flow path layer 26b. The above-described ejection layer is provided between the flow path layer 26b and the upper surface layer 26c. Electrode 28 is inserted.
- the base layer 26a is formed of a silicon substrate or a highly insulating resin or ceramic, and a soluble resin layer is formed on the base layer 26a, and only a portion following the pattern of the supply path 27 and the ink chamber 24 is formed. The remaining part is removed and an insulating resin layer is formed on the removed part.
- This insulating resin layer becomes the flow path layer 26b. Then, the discharge electrode 28 is formed on the lower surface of the insulating resin layer by a conductive material (for example, NiP), and an insulating resin resin layer is also formed with the lower force. Since this resist resin layer becomes the lower surface layer 26c, this resin layer is formed with a thickness in consideration of the height of the nozzle 21.
- a conductive material for example, NiP
- this insulating resist resin layer is exposed by an electron beam method or a femtosecond laser to form a nozzle shape.
- the nozzle internal flow path 22 is also formed by a laser cage. Then, the dissolvable resin layer according to the pattern of the supply path 27 and the ink chamber 24 is removed, and the supply path 27 and the ink chamber 24 are opened to complete the nozzle plate.
- the counter electrode 23 has a counter surface perpendicular to the nozzle 21 as described above, and supports the thin film transistor K along the counter surface.
- the distance L between the tip portion force of the nozzle 21 and the opposing surface of the counter electrode 23 is set to 100 [m]. Since the counter electrode 23 is grounded, the ground potential is always maintained. Therefore, when a pulse voltage is applied, the ink droplet ejected by the electrostatic force generated by the electric field generated between the tip A of the nozzle 21 and the opposing surface is guided to the opposing electrode 23 side.
- the recording head 20 can eject ink droplets in a state where the electric field strength is increased due to electric field concentration at the tip A of the nozzle 21, it can eject ink droplets without induction by the counter electrode 23.
- Force that can be performed It is desirable that induction is performed between the nozzle 21 and the counter electrode 23 by electrostatic force.
- the charge of the charged ink droplet can be released by grounding the counter electrode 23.
- the ink preferably does not contain particles having a diameter of 0.3 m or more.
- an ink having a viscosity of 0.1 to: LOOOmPa's (preferably 1 to 100 mPa's) and a surface tension force S20 to 70 mNZm (preferably 25 to 50 mNZm) is applied.
- LOOOmPa's preferably 1 to 100 mPa's
- S20 to 70 mNZm preferably 25 to 50 mNZm
- the ink viscosity is less than 0. ImPa's or greater than lOOOmPa's, ink ejection from the nozzle 21 becomes unstable.
- the surface tension of the ink is less than 20 mNZm, the ink droplets ejected from the nozzle 21 tend to spread on the substrate K.
- the surface tension of the ink is greater than 70 mNZm, each pixel of the substrate K cannot be completely filled with the ink droplets ejected from the nozzle 21.
- the horizontal axis represents time T
- the vertical axis represents the superimposed voltage V generated by the ejection voltage power supply 29 and the bias power supply 30.
- Ink is supplied to the in-nozzle flow path 22 by the supply pump of the ink supply means, and a bias voltage is applied to the ink via the discharge electrode 28 by the bias power supply 30.
- the nozzle 21 force and the like eject ink droplets having a droplet amount of 1 to 400 fl per droplet.
- the electrostatic attraction type inkjet apparatus having the recording head 20 described above has a fine diameter, it is possible to easily perform control for reducing the discharge flow rate per unit time due to the low nozzle conductance. In addition to this, it is possible to eject ink with sufficiently small ink droplets (ink droplets of 1 to 400 fl per droplet) without reducing the pulse width.
- the droplet amount per ink droplet ejected from the nozzle 21 can be set to 1 to 400 fl. Since the amount of ink droplets landing on the star K can be suppressed to 0.2 to 5.6 mlZm2, each dot diameter of the ink droplets adhering to the thin film transistor K can be greatly reduced. Therefore, the required insulation area width (channel length) of 10 ⁇ m or less, which has been a problem in the past, can be reduced, and ink bleeding, poor drying of the ink itself, insulation area width (channel length). This makes it possible to suppress adverse effects such as variations in the thickness of the organic semiconductor layer, and to form a high-definition insulating region with a plurality of ultrafine dots on the organic semiconductor layer.
- an electrode is provided on the outer periphery of the nozzle 21, or an electrode is provided on the inner surface of the nozzle inner flow path 22.
- the force may also be covered with an insulating film.
- the wettability of the inner surface of the nozzle flow path 22 can be increased by the electrowetting effect for the ink to which the voltage is applied by the ejection electrode 28.
- the ink can be smoothly supplied to the nozzle flow path 22, and the ink can be discharged well and the responsiveness of the discharge can be improved.
- the discharge voltage applying means 25 constantly applies a bias voltage and discharges ink droplets using a pulse voltage as a trigger. It can be configured to discharge by switching the frequency of the frequency as well as applying.
- Ink discharge is essential to eject ink droplets, and even when an ejection voltage is applied at a frequency that exceeds the rate at which the ink is charged, ejection is not performed and the ink can be sufficiently charged. If it changes to, discharge will be performed. Therefore, when ejection is not performed, the ejection voltage is applied at a frequency higher than the ejectable frequency, and control is performed to reduce the frequency to a frequency band that can be ejected only when ejection is performed, thereby controlling ink ejection. Is possible. In such a case, since the voltage applied to the ink itself does not change, it is possible to further improve the responsiveness and thereby improve the ink droplet landing accuracy. [0105] ⁇ Flowable electrode material: source electrode, drain electrode>
- the fluid electrode material shown below is supplied to the insulating region 6 described above, and the supplied fluid electrode material is stretched left and right around the insulating region, The stretched fluid electrode material is divided into left and right in the insulating region, thereby forming the source electrode 5 on one side of the insulating region and the drain electrode 4 on the other side.
- the fluid electrode material according to the present invention specifically includes a conductive material shown below, a solution,
- Paste ink, liquid dispersion.
- precursor materials that develop conductivity by heat treatment, light irradiation, etc. may be used.
- the solvent or the dispersion medium contains 50% by mass or more of water.
- the conductive material is not particularly limited as long as it has conductivity at a practical level as an electrode.
- the conductive material a conductive polymer, metal fine particles, and the like can be preferably used.
- the dispersion containing metal fine particles include known conductive pastes. However, it is preferably a dispersion containing fine metal particles having a particle diameter of 1 nm to 50 nm, preferably 1 nm to 10 nm.
- Materials for the metal fine particles include platinum, gold, silver, nickel, chromium, copper, iron, tin, antimony lead, tantalum, indium, palladium, tellurium, rhenium, iridium, aluminum, ruthenium, germanium, Molybdenum, tungsten, zinc, or the like can be used.
- an electrode using a dispersion in which fine particles made of these metals are dispersed in water or a dispersion medium which is an arbitrary organic solvent using a dispersion stabilizer mainly having organic material power. Good.
- a metal phase in a liquid phase such as a physical generation method such as a gas evaporation method, a sputtering method or a metal vapor synthesis method, a colloid method, or a coprecipitation method is used.
- the chemical production method include reducing metal ions to produce fine metal particles, and preferably, JP-A-11-76800, JP-A-11-80647, JP-A-11-319538, JP-A 2000-239985.
- JP-A-11-76800, JP-A-11-80647, JP-A-11-319538, JP-A 2000-239985 Disclosed in Japanese Patent Publication No. 2001-254185, No. 2001-53028, No. 2001-35255, No. 2000-124157, No. 2000-123634, etc. This is a dispersion of fine metal particles produced by the gas evaporation method.
- the source electrode and the drain electrode it is also preferable to use a known conductive polymer whose conductivity has been improved by doping or the like, for example, conductive polyarine, conductive polypyrrole, conductive Polythiophene, a complex of polyethylene dioxythiophene and polystyrene sulfonic acid, and the like are also preferably used. As a result, the contact resistance between the source electrode, the drain electrode, and the organic semiconductor layer can be reduced.
- the patterning method for the source electrode, the drain electrode, and the like described above is performed by supplying a fluid electrode material to an insulating region having electrode material repulsion and dividing the source electrode and the drain electrode. Anything that can be used may be used.
- a solution or dispersion containing a source electrode and a drain electrode forming material on an insulating region having electrode material repellent properties by an electrostatic suction ink jet method A fluid electrode material is supplied, and the fluid electrode material is divided by the electrode material repellent property of the insulating region to obtain a source electrode and a drain electrode.
- the source electrode and the drain electrode are formed by discharging ink containing a fluid electrode material onto the insulating region by the electrostatic suction ink jet method, the electrode forming region by ink discharge is appropriately set. From the viewpoint of adjusting the size, it is preferable to provide a receiving layer.
- a void type receiving layer used in a conventionally known ink jet recording medium is preferably used.
- it is formed by a step of supplying a source electrode and the drain electrode force and the fluid electrode material to the receiving layer.
- the void type which is preferred as the void type, is a mixture of fine particles and a water-soluble binder.
- Examples of the fine particles that can be used in the receptor layer include inorganic fine particles and organic fine particles.
- inorganic fine particles are preferable because fine particles can be easily obtained.
- examples of such inorganic fine particles include light calcium carbonate, heavy calcium carbonate, magnesium carbonate, kaolin, clay, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc hydroxide, zinc sulfide.
- Zinc carbonate hydrated talcite, aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, synthetic amorphous silica, colloidal silica, alumina, colloidal alumina, pseudoboehmite, aluminum hydroxide, lithopon, zeolite, hydroxide And white inorganic pigments such as magnesium.
- the inorganic fine particles can be used as primary particles or in a state in which secondary agglomerated particles are formed.
- the inorganic fine particles alumina, pseudoboehmite, colloidal silica, or fine particle silica synthesized by a gas phase method is preferred, which is preferably a fine particle silica synthesized by a gas phase method.
- the silica synthesized by this vapor phase method may have a surface modified with A1.
- the A1 content of the vapor-phase process silica whose surface is modified with A1 is preferably 0.05% to 5% by mass with respect to silica! /.
- the particle size of the inorganic fine particles can be any particle size.
- the average particle size is preferably less than or equal to force m, more preferably 0.2 / zm or less, particularly preferably. 0.1 m or less.
- the lower limit of the particle size is not particularly limited, but from the viewpoint of production of inorganic fine particles, it is generally a force of 0.003 / zm or more, preferably S, particularly preferably 0.005 / zm or more. It is.
- the average particle size of the inorganic fine particles can be obtained as a simple average value (number average) by observing the cross section or surface of the porous layer with an electron microscope and determining the particle size of 100 arbitrary particles. .
- each particle size is expressed as a diameter assuming a circle equal to the projected area.
- the fine particles may remain as primary particles or may be present in the porous film as secondary particles or higher-order agglomerated particles.
- the independent particle size is formed in the porous layer, which is the particle size of the material.
- the content of the fine particles in the water-soluble coating liquid is preferably 5% by mass to 40% by mass, and particularly preferably 7% by mass to 30% by mass.
- hydrophilic binder contained in the void-type receiving layer conventionally known hydrophilic binders that are not particularly limited can be used.
- hydrophilic binders that are not particularly limited can be used.
- gelatin polybutylpyrrolidone, polyethylene oxide, polyacrylamide, The ability to use polyvinyl alcohol, etc.
- Polyvinyl alcohol is particularly preferred.
- Polyvinyl alcohol is a polymer that has an interaction with inorganic fine particles, has a particularly high holding power on inorganic fine particles, and has a relatively small hygroscopic humidity dependency.
- Examples of the polybilyl alcohol preferably used in the present invention include a poly (vinyl alcohol) having a cation-modified poly (vinyl alcohol) group in addition to a normal poly (b) alcohol obtained by hydrolysis of polyvinyl acetate.
- -Modified polybulal alcohol such as on-modified polybulal alcohol is also included.
- polybulal alcohol obtained by hydrolyzing butyl acetate those having an average degree of polymerization of 300 or more are preferably used, and those having an average degree of polymerization of 1,000 to 5,000 are particularly preferably used.
- the saponification degree is preferably from 70% to 100%, particularly preferably from 80% to 99.5%.
- examples of the cation-modified polybulu alcohol include primary to tertiary amino groups and quaternary ammonium groups as described in JP-A-61-10483. These are polybulal alcohols in the main chain or side chain, which are obtained by saponifying a copolymer of ethylenically unsaturated monomer having a cationic group and butyl acetate.
- Examples of the ethylenically unsaturated monomer having a cationic group include trimethyl- (2-acrylamide-1,2,2-dimethylethyl) ammonium chloride, trimethyl-1- (3-acrylamido-1,3,3-dimethylpropyl). ) Ammonium chloride, N-Buremidazole, N-Buyl 2-Methylimidazole, N- (3-Dimethylaminopropyl) methacrylamide, Hydroxyethyltrimethylammonium chloride, Trimethyl (3-methacrylamidopropyl) ammo- Um chloride, N- (1,1-dimethyl-3-dimethylaminopropyl) acrylamide and the like.
- polyone alcohol having a ionic group described in JP-A No. 1-206088, JP-A 61-237681, and 63 Copolymers of vinyl alcohol and a vinyl compound having a water-soluble group described in JP-A-307979, and modified polyvinyl alcohol having a water-soluble group described in JP-A-7-285265.
- non-one modified polybulal alcohol examples include, for example, a polyvinyl alcohol derivative obtained by adding a polyalkylene oxide group described in JP-A-7-9758 to a part of the butalcohol. And block copolymers of vinyl alcohol having a hydrophobic group and vinyl alcohol described in Kaihei 8-25795.
- Polyvinyl alcohol can be used in combination of two or more, such as the degree of polymerization and the type of modification.
- polybulal alcohol having a degree of polymerization of 2000 or more 0.05 wt% to 10 wt% of polybullic alcohol having a degree of polymerization of 1000 or less is previously added to the inorganic fine particle dispersion with respect to the inorganic fine particles.
- 0.1% by mass to 5% by mass is added, and then polybulal alcohol having a polymerization degree of 2000 or more is added without significant increase in viscosity. That's right.
- the ratio of the fine particles to the hydrophilic binder in the void-type receiving layer swells at the time of the excessive hydrophilic binder force ink jet recording while maintaining the porosity of the porous layer properly and maintaining sufficient void volume. It is more preferable that the mass ratio is 2 to 20 times from the viewpoint of preventing the gaps from being blocked, maintaining the appropriate absorption rate of the conductive polymer, and preventing cracking of the porous layer. Is 2.5 to 12 times, particularly preferably 3 to 10 times.
- the semiconductor layer according to the present invention can include a conventionally known inorganic or organic semiconductor material such as amorphous silicon or polysilicon, but in the present invention, it is preferable to include an organic semiconductor material.
- a ⁇ -conjugated material is used as the organic semiconductor material used for the organic semiconductor layer 3 according to the present invention.
- a ⁇ -conjugated material is used.
- polypyrrole poly ( ⁇ -substituted pyrrole), poly (3-substituted pyrrole), poly (3, 4-two Polypyrroles such as substituted pyrrole), polythiophene such as polythiophene, poly (3-substituted thiophene), poly (3,4-disubstituted thiophene), polybenzothiophene, and polyisothianaphthene such as polyisothianaphthene.
- Polychelene vinylenes such as polyethylene vinylene, poly ( ⁇ -phenolic vinylene) such as poly ( ⁇ -phenolic vinylene), polyarlin, poly ( ⁇ -substituted) ), Poly (3-substituted aryne), poly (2,3-substituted ar), polyacetylenes such as polyacetylene, polydiacetylenes such as polydiacetylene, Polyazulenes such as riazulene, polypyrenes such as polypyrene, polycarbazole and poly (r-azole) such as poly ( ⁇ -substituted carbazole), polyselenophenes such as polyselenophene, polyfurans such as polyfuran and polybenzofuran , Poly ( ⁇ -phenol) such as poly ( ⁇ -phenol), polyindoles such as polyindole, polypyridazines such as polypyridazine, naphthacene, pentace
- Derivatives substituted with a functional group such as any atom or carbocycle (triphenodioxazine, triphenodithiazine, hexacene 6, 15 quinone, etc.), polymers such as polyvinylcarbazole, polyphenolsulfide, polyvinylsulfide
- a functional group such as any atom or carbocycle (triphenodioxazine, triphenodithiazine, hexacene 6, 15 quinone, etc.)
- polymers such as polyvinylcarbazole, polyphenolsulfide, polyvinylsulfide
- the polycyclic condensates described in JP-A-11 195790 can be used.
- thiophene hexamer having the same repeating unit as these polymers--seccithiophene e, ⁇ -dihexinole a-sexuality phen, ⁇ , ⁇ -dihexyl- ⁇ -quinketiophene, ⁇ Oligomers such as ⁇ -bis (3-butoxypropyl) -a-seccithiophene and styrylbenzene derivatives can also be suitably used.
- copper phthalocyanine is a metal phthalocyanine such as fluorine-substituted copper phthalocyanine described in JP-A-11-251601, naphthalene 1, 4, 5, 8-tetracarboxylic acid diimide, N, N, Bis (4 trifluoromethylbenzyl) naphthalene 1, 4, 5, 8—tetra-force
- Examples include dyes such as nanotubes, merocyanine dyes, and hemicyanine dyes.
- thiophene, vinylene, styrene vinylene, phenylene vinylene, ⁇ -phenylene, substituted ones thereof, or two or more of these are repeated units, and From oligomers having the number of repeating units ⁇ power ⁇ 10 or polymers having the number of repeating units ⁇ of 20 or more, condensed polycyclic aromatic compounds such as pentacene, fullerenes, condensed ring tetracarboxylic acid diimides, metal phthalocyanines Group power of at least one selected is preferred.
- organic semiconductor materials include tetrathiafulvalene (TTF) -tetracyanoquinodimethane (TCNQ) complex, bisethylenetetrathiafulvalene (BEDTTTF) -perchloric acid complex, BEDTTTF iodine complex, TCNQ iodine complex, etc.
- TTF tetrathiafulvalene
- BEDTTTF bisethylenetetrathiafulvalene
- TCNQ iodine complex etc.
- Organic molecular complex Can also be used.
- ⁇ -conjugated polymers such as polysilane and polygermane can also be used as organic'inorganic hybrid materials described in JP-A-2000-260999.
- a material having a functional group such as acrylic acid, acetamide, dimethylamino group, cyano group, carboxyl group, nitro group, benzoquinone derivative, tetracyanethylene and Materials that serve as acceptors, such as tetracyanoquinodimethane and derivatives thereof, and materials that have functional groups such as amino, triphenyl, alkyl, hydroxyl, alkoxy, and phenyl groups Donors that are donors of electrons such as substituted amines such as phenylenediamine, anthracene, benzoanthracene, substituted benzoanthracenes, pyrene, substituted pyrene, force rubazole and its derivatives, tetrathiafluoronorne and its derivatives So-called doping treatment It may be.
- a functional group such as acrylic acid, acetamide, dimethylamino group, cyano group, carboxyl group, nitro group, benzoquinone derivative, t
- the doping means introducing an electron-donating molecule (acceptor) or an electron-donating molecule (donor) into the thin film as a dopant. Therefore, the doped thin film is a thin film containing the condensed polycyclic aromatic compound and the dopant.
- a well-known thing can be employ
- the methods for producing these organic semiconductor layers include vacuum deposition, molecular beam epitaxy, ion cluster beam, low energy ion beam, ion plating, CVD, sputtering, plasma polymerization, and electropolymerization. , Chemical polymerization method, spray coating method, spin coating method, blade coating method, dip coating method, casting method, roll coating method, bar coating method, die coating method, inkjet method and LB method, etc., depending on the material Can be used.
- a spin coat method a blade coat method, a dip coat method, a roll coat method, a bar coat method, which can easily and precisely form a thin film using an organic semiconductor solution, A die coating method, an ink jet method or the like is preferably used.
- the precursor film formed by coating is heat-treated. Then, a thin film of a target organic material may be formed.
- the thickness of the organic semiconductor layer that also has the organic semiconductor material power is not particularly limited, but the characteristics of the obtained transistor are often greatly influenced by the thickness of the organic semiconductor layer. Depends on the type of organic semiconductor material, but generally: L m or less, especially ⁇ ! ⁇ 300 nm is preferred.
- an ink containing a conductive material is prepared.
- a solvent or a dispersion medium used for the ink is an organic material. It is preferable to select a material with minimal damage to the semiconductor (organic semiconductor layer)! Further, the damage is a force depending on the semiconductor material. For example, when pentacene is used, it is preferable to contain 50% by mass or more of water, more preferably 60% by mass or more, and particularly preferably 90% by mass. A solvent or dispersion medium containing the above.
- a transparent conductive film or the like formed from the above materials can also be used.
- the term "transparent” means that the light transmittance (ultraviolet light to visible light as light) is at least 50% or more, preferably 80% or more.
- the organic thin film transistor which is a preferred embodiment of the thin film transistor of the present invention, preferably has an intermediate layer (also referred to as a semiconductor protective layer) 3 a between the insulating region and the semiconductor layer in contact with the organic semiconductor layer.
- an intermediate layer also referred to as a semiconductor protective layer
- deterioration of the organic semiconductor layer due to air or water can be suppressed.
- durability due to bending or the like is also improved, and thereby deterioration of characteristics as a transistor can be suppressed.
- the effect of suppressing damage to the organic semiconductor layer when forming the insulating region depends on the type of organic semiconductor material, the material forming the ink repellent insulating region, and the type of the solvent. Can be obtained.
- a material that does not affect the organic semiconductor layer is selected during or after the manufacturing process of the organic semiconductor transistor.
- phenolic resin such as polyvinyl phenol or novolak resin, epoxy resin, hydrophilic polymer, etc. depending on the type of semiconductor material.
- the hydrophilic polymer is a polymer having solubility or dispersibility with respect to water or aqueous solutions of an acidic aqueous solution, an alkaline aqueous solution, an alcohol aqueous solution, and various surfactants.
- polybulal alcohol, homopolymers and copolymers having component strength such as HEMA, acrylic acid, and acrylamide can be preferably used.
- materials containing inorganic oxides and inorganic nitrides are preferred because they do not affect the organic semiconductor and do not affect other coating processes.
- materials for the gate insulating layer described later can also be used.
- the intermediate layer containing an inorganic oxide or an inorganic nitride is preferably formed by an atmospheric pressure plasma method.
- a method for forming a thin film by a plasma method under atmospheric pressure is a process in which a thin film is formed on a substrate by discharging at atmospheric pressure or a pressure near atmospheric pressure, exciting a reactive gas into plasma, and
- the methods are described in JP-A-11-61406, JP-A-11-133205, JP-A-2000-121804, JP-A-2000-147209, JP-A-2000-185362, etc. Also called atmospheric pressure plasma method).
- a highly functional thin film can be formed with high productivity.
- Various insulating films can be used as the gate insulating layer 2a of the thin film transistor of the present invention, and an inorganic oxide film having a high relative dielectric constant is particularly preferable.
- inorganic oxides include silicon oxide, aluminum oxide, tantalum oxide, titanium oxide, tin oxide, vanadium oxide, barium strontium titanate, barium zirconate titanate, tin zirconate titanate, lanthanum titanate, Examples include strontium titanate, barium titanate, barium magnesium fluoride, bismuth titanate, strontium bismuth titanate, strontium bismuth tantanoate, bismuth tantalate niobate, and yttrium trioxide. Among them, preferable are silicon oxide, acid aluminum, tantalum oxide, and titanium oxide. Inorganic nitrides such as silicon nitride and aluminum nitride are also preferably used.
- Method of forming gate insulating layer examples include a vacuum process, a molecular beam epitaxial growth method, an ion cluster beam method, a low energy ion beam method, an ion plating method, a CVD method, a sputtering method, and an atmospheric pressure plasma method.
- Wet processes such as spray coating method, spin coating method, blade coating method, dip coating method, casting method, roll coating method, bar coating method, die coating method, and other methods such as printing and ink jet patterning Can be used depending on the material.
- the wet process includes a method of applying and drying a liquid in which fine particles of inorganic oxide are dispersed in an arbitrary organic solvent or water using a dispersion aid such as a surfactant as necessary, or an oxide precursor.
- a so-called sol-gel method in which a solution of a body, for example, an alkoxide body is applied and dried is used.
- the film formation by the atmospheric pressure plasma method or the anodizing method described above is preferable.
- the gate insulating layer is composed of an anodized film or the anodized film and an insulating film.
- the anodized film is preferably sealed.
- the anodized film is formed by anodizing a metal that can be anodized by a known method.
- Examples of the metal capable of anodizing treatment include aluminum and tantalum, and a known method without particular limitation can be used for the method of anodizing treatment.
- An oxide film is formed by anodizing.
- an electrolytic solution used for anodizing treatment any electrolyte solution can be used as long as it can form a porous acid film, and generally, sulfuric acid, phosphoric acid, oxalic acid, chromic acid, boric acid.
- sulfamic acid, benzene sulfonic acid, etc. are mixed acids in which two or more of these are combined, and salts thereof are used.
- the treatment conditions for anodization vary depending on the electrolyte used, and cannot be specified.
- the concentration of the electrolyte is 1% to 80% by weight, and the temperature of the electrolyte is 5 ° C to 70%. .
- C current density 0.5AZdm 2 ⁇ 60AZdm 2 , voltage IV ⁇ : LOOV, electrolysis time 10 seconds ⁇ 5 minutes are suitable.
- a preferred anodizing treatment is a method in which an aqueous solution of sulfuric acid, phosphoric acid, boric acid, tartaric acid or the like or a salt thereof is used as the electrolytic solution, and the treatment is performed with a direct current, but an alternating current can also be used.
- the concentration of these acids is 5 wt% to 45 wt% and it is a temperature 20 ° desirability instrument electrolyte C ⁇ 50 ° C, at a current density of 0. 5AZdm 2 ⁇ 20AZdm 2 20 seconds It is preferable to electrolyze for ⁇ 250 seconds!
- organic compound film polyimide, polyamide, polyester, polyacrylate, photo-radical polymerization system, photopower thione polymerization system photocurable resin, or copolymer containing acrylonitrile component, polybule Phenolic alcohol, polybutyl alcohol, novolac resin, cyano ethyl pullulan and the like can also be used.
- the wet process is preferred.
- An inorganic oxide film and an organic oxide film can be laminated and used together.
- the thickness of these insulating films is generally 50 nm to 3 ⁇ m, preferably 100 nm to l ⁇ m.
- Arbitrary alignment treatment may be performed between the gate insulating layer and the organic semiconductor layer.
- a silane coupling agent such as octadecyltrichlorosilane, trichloromethylsilazane, self-organizing alignment film such as alkane phosphoric acid, alkanesulfonic acid, alkanecarboxylic acid is preferably used.
- the same material as the constituent material of the source electrode and the drain electrode can be used.
- the support is preferably a resin sheet made of resin.
- the resin sheet examples include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polyetherimide, polyetheretherketone, polyphenylene sulfide, polyarylate, polyimide, polyimide, and the like.
- a resin sheet film such as carbonate (PC), cellulose triacetate (TAC), and cellulose acetate propionate (CAP).
- a sealing film may be provided on the organic thin film transistor of the present invention.
- the sealing film include the above-described inorganic oxides and inorganic nitrides, and the sealing film is preferably formed by the above-described atmospheric pressure plasma method. Thereby, the durability of the organic thin film transistor is improved.
- the thin film transistor of the present invention preferably has at least one of an undercoat layer containing a compound selected from inorganic oxides and inorganic nitrides and an undercoat layer containing a polymer.
- the inorganic oxides contained in the undercoat layer include silicon oxide, acid aluminum, acid tantalum, titanium oxide, tin oxide, vanadium oxide, barium strontium titanate, zirconium Barium titanate, lead zirconate titanate, lead lanthanum titanate, strontium titanate, barium titanate, magnesium barium fluoride, bismuth titanate, strontium bismuth titanate, strontium bismuth tantanoate, tantalate nitric acid Examples thereof include bismuth butyrate and trioxide yttrium.
- the inorganic nitride include nitride nitride and aluminum nitride.
- silicon oxide aluminum oxide, tantalum oxide, titanium oxide, and silicon nitride.
- the lower bow I layer containing a compound selected from inorganic oxides and inorganic nitrides is preferably formed by the atmospheric pressure plasma method described above.
- Polymers used for the undercoat layer containing polymer include polyester resin, polycarbonate resin, cellulose resin, acrylic resin, polyurethane resin, polyethylene resin, polypropylene resin, polystyrene resin, Phenoxy resin, norbornene resin, epoxy resin, vinyl chloride-vinyl acetate copolymer, vinyl chloride resin, vinyl acetate resin, copolymer of vinyl acetate and vinyl alcohol, partially water-decomposed vinyl chloride -Ruacetate butyl copolymer, salt-bule monosalt-biurydene copolymer, salt butyl-acrylonitrile copolymer, ethylene vinyl alcohol copolymer, polybulu alcohol, chlorinated polysulphated butyl, ethylene Bile monochloride copolymer, ethylene-vinyl acetate copolymer and other vinyl polymers, polyamide resin, ethylene butadiene Down ⁇ , butadiene - Atari port - DOO drill ⁇ rubber such ⁇
- FIG. 5 illustrates a method for manufacturing a thin film transistor of the present invention.
- the discharge droplet volume per droplet is 1 to 400 fl.
- a step of forming an insulating region having repulsiveness with an electrode material containing silicon rubber by a cudget device, and a flowable electrode material supplied to the insulating region is divided at the insulating region to thereby form a source electrode and a drain electrode.
- a method for manufacturing a thin film transistor element and a thin film transistor element sheet, each of which includes a step of forming each of them will be described with reference to FIG.
- the receiving layer 7 is further formed thereon using the materials and the forming method described above.
- insulating material droplets 6a having electrode material repellency are ejected by the electrostatic suction ink jet apparatus.
- an insulating material 6 having electrode material repellent properties is formed by permeating the receiving layer 7 with an insulating material having electrode material repellent properties containing silicon rubber.
- the fluid electrode material 8 is further supplied (injected) from above the insulating region 6 by the electrostatic suction ink jet device so as to protrude from the left and right of the insulating region 6.
- the fluid electrode material 8 is 8a due to the insulating region 6 having electrode material repulsion.
- the flowable electrode materials 8a and 8b penetrate into the receiving layer 7 to form the source electrode 5 and the drain electrode 4, thereby completing one thin film transistor element.
- the source electrode 5 and the drain electrode 4 are formed by the electrostatic suction ink jet apparatus.
- the solvent or dispersion medium of the discharge liquid of the electrostatic attraction type ink jet device used for forming the source electrode 5 and the drain electrode 4 contains 50% by mass or more of water.
- the force described for the bottom-gate thin film transistor can be applied to the top-gate thin film transistor.
- the material is omitted.
- FIG. 6 is a schematic view showing an example of forming an insulating region on the organic semiconductor layer by the electrostatic attraction type ink jet device.
- the insulating material droplet 6 a is discharged to the approximate center of the organic semiconductor layer 3 using the electrostatic suction type ink jet device.
- a nozzle (not shown) is moved in parallel with the organic semiconductor layer 3, and each droplet (6a) is ejected in a straight line so as not to be displaced in the horizontal direction in the drawing.
- the ink droplets landed on a straight line are ejected in a superimposed manner as illustrated so that the edges of the ink droplets do not become uneven.
- the insulating region 6 having electrode material repellent property having a necessary channel length is formed.
- FIG. 7 is a schematic diagram showing an example of forming a source / drain electrode by an inkjet method.
- FIG. 7 (a) at least the width of the insulating region 6 (channel length) or more, preferably the width of the organic semiconductor layer 3 or more, using the electrostatic attraction type ink jet device at the approximate center of the insulating region 6.
- a fluid electrode material droplet 8c having a diameter of 5 mm is discharged.
- a nozzle (not shown) is moved in parallel with the insulating region 6, and each droplet (8c) is ejected on a straight line so as not to be displaced in the horizontal direction in the drawing.
- the ink droplets that have landed on a straight line are ejected in an overlapping manner as illustrated so that the edges of the ink droplets do not become uneven.
- Fig. 7 (b) shows that the ejected fluid electrode material droplet 8c is repelled by the electrode material repellent property of the insulating region 6 and aggregates to the left and right of the insulating region 6 (8a, 8b) This shows the state.
- FIG. 8 is a schematic view showing another example of forming the source and drain electrodes by the inkjet method.
- FIG. 8 (a) at least a part of the fluid electrode material droplet 8c is used by using the electrostatic suction ink jet device at a position spaced apart from the center of the insulating region 6 by a predetermined distance on the left and right in the drawing.
- the fluid electrode material droplet 8c is ejected so as to overlap the insulating region 6
- ink droplets that have landed on a straight line are ejected in a superimposed manner as illustrated so that the edges of the ink droplets do not become uneven.
- FIG. 8 (b) shows the portion of the ejected fluid electrode material droplet 8c that overlaps the insulating region 6;
- FIG. 9 is an explanatory view of one embodiment of a manufacturing process of a thin film transistor element of the thin film transistor element sheet of the present invention by an ink jet method.
- FIG. 9 one mode of a manufacturing process of a thin film transistor element of the thin film transistor element sheet of the present invention by an inkjet method will be described.
- the fabrication of the fluid electrode material repellent region 6, the source electrode 5, the drain electrode 4, and the source nose line 12 is described.
- a channel region (layer) composed of the organic semiconductor layer 3 is provided so as to intersect with the gate bus line 11 which also serves as a gate electrode, and a fluid electrode material repulsion region (layer) 6 is formed.
- an ink composed of a dispersion or a solution containing a fluid electrode material is supplied to both sides of the fluid electrode material repulsion region 6 or is supplied onto the repulsion region 6, and the fluid electrode material is supplied.
- the source electrode 5, the drain electrode 4, and the pixel electrode 4a are formed by dividing.
- the fluid electrode material repulsion region 6 is formed by the electrostatic suction ink jet apparatus.
- regions may be formed by changing the discharge position with the electrostatic suction type ink jet apparatus and performing multiple discharges.
- Ordinary ink jet may be formed by changing the position more coarsely and performing multiple discharges.
- the source bus line 12 is formed by the electrostatic bow I type ink jet apparatus.
- FIG. 10 is an equivalent circuit diagram showing an embodiment of a thin film transistor element sheet in which a plurality of thin film transistor elements of the present invention are arranged.
- the thin film transistor element sheet 10 has a large number of thin film transistor elements 14 arranged in a matrix with a support made of a resin substrate.
- 11 is a gate bus line of the gate electrode of each thin film transistor element 14, and 12 is a source bus line of the source electrode of each thin film transistor element 14.
- An output element 16 is connected to the drain electrode of each organic transistor element 14, and the output element 16 is, for example, a liquid crystal or an electrophoretic element, and constitutes a pixel in the display device.
- the output element 16 is shown as an equivalent circuit having a liquid crystal force resistance and a capacitor force.
- 15 is a storage capacitor
- 17 is a vertical drive circuit
- 18 is a horizontal drive circuit.
- Such a sheet in which TFT elements are two-dimensionally arranged on a flexible resin support has a high adhesive strength between the support and the TFT constituent layer, and has a high mechanical strength. It can be made strong and resistant to bending.
- FIGS. 11 (a), (b), and (c) will be described with some powers of the thin film transistor element sheet in which the semiconductor layer of the present invention shown in FIG. 10 contains an organic semiconductor material.
- FIG. 11 is a schematic view showing an embodiment of an organic thin film transistor forming one pixel of the thin film transistor element sheet of the present invention.
- the gate bus line 11 here, the gate nose line 11 is covered with a gate insulating layer (not shown), and therefore exists as a dotted line
- the organic semiconductor layer 3 is provided so as to intersect with the fluid electrode, and the fluid electrode material repulsion region 6 (also referred to as a layer) is provided on the organic semiconductor layer 3 and the fluid electrode.
- a drain electrode 4 and a source electrode 5 are provided on both sides of the material repulsion region 6.
- the gate bus line 11 serves as a gate electrode.
- FIG. 11 (b) is different from FIG. 6 (a) in that the gate electrode branches from the gate bus line 11.
- FIG. The organic semiconductor layer 3 is disposed on a gate electrode branched from the gate bus line 11, a source electrode 5 and a drain electrode are disposed in contact therewith, and a pixel electrode 4 a is formed on the drain electrode 4.
- the pixel electrode 4 a may also serve as the drain electrode 4.
- FIG. 11 (c) is a schematic diagram showing that the source electrode 5, the drain electrode 4, and the pixel electrode 4a are formed from two ink-jet dots.
- the fluid electrode material repulsion region 6 and the source bus line 12 are formed, when a droplet of the fluid electrode material is ejected to the organic semiconductor layer 3 and the fluid electrode material repulsion region 6 formed thereon, Flowable electrode material is self-organized on 6 Therefore, both the source electrode and the drain electrode are formed by one droplet, and the source electrode is joined to the source bus line.
- the pixel electrode 4 a is formed from one inkjet droplet and is joined to the drain electrode 4.
- the pixel electrode 4a is separated from the source electrode 5 and the source nose line 12 by the fluid electrode material repulsion region 6, thereby preventing a short circuit.
- Each of the liquid electrode material droplets described above may be controlled to an arbitrary liquid amount in accordance with the desired size of the electrode that can be finally formed.
- a simple electrode can be formed by enlarging a droplet for the pixel electrode and discharging it to a desired position by the electrostatic suction ink jet apparatus.
- the drain electrode forms a pixel electrode 4a, or the drain electrode 4 is connected to the pixel electrode 4a, and the pixel electrode and the source bus line are separated by the insulating region. Well, okay.
- a channel region comprising a gate electrode, a gate insulating layer, and a semiconductor layer on a support according to the present invention.
- Thin film transistor element power having a region, a source electrode and a drain electrode
- a method for producing a plurality of thin film transistor element sheets connected via a gate bus line and a source bus line is as follows:
- an insulating region having electrode material repellent property is directly or via another layer, and the volume per droplet of the ejected droplet is 1 to 400 fl and the nozzle diameter is 1
- the flowable electrode material is divided by the step, and at least the source electrode and the drain electrode are formed, which will be described below.
- the flowable electrode material of the thin film transistor element sheet and the method of forming the source / drain electrodes are the same as described above.
- the materials for the gate electrode, semiconductor layer, intermediate layer, gate insulating layer, support and the like used for the thin film transistor element sheet are the same as those described for the thin film transistor, and they are the same as those for the thin film transistor. Formed.
- the fluid electrode material is supplied by the electrostatic suction ink jet apparatus.
- FIG. 12 is an explanatory diagram of a first mode in which insulating regions are formed in a line shape on an element sheet.
- Fig. 13 is an explanatory diagram of a second mode in which insulating regions are formed in a line shape on an element sheet.
- FIG. 14 is an explanatory diagram of the third embodiment in which the insulating region is formed in a line shape on the element sheet.
- FIG. 15 is an explanatory diagram of the fourth embodiment in which the insulating region is formed in a line shape on the element sheet.
- the organic semiconductor layer 3 is formed by, for example, an electrostatic suction type ink jet apparatus that discharges a solution or a dispersion of an organic semiconductor material in a form intersecting with the gate bus line 11.
- the insulating region 6 is formed in a line while conveying the support (not shown) in a direction intersecting the gate bus line 11.
- a preferred method for forming the insulating region 6 in a line shape is a method of patterning with the electrostatic suction ink jet apparatus.
- a channel region is formed by the lines of the insulating region 6 formed on the element sheet, and regions A and B are formed by simultaneously forming the A and B lines.
- the fluid electrode material is supplied to the region 20 to form the source electrode and the source bus line, the fluid electrode material is supplied to the region 21, and the drain electrode 4 and the pixel electrode 4a are formed.
- the region 21 forms a storage capacitor with the adjacent gate bus line.
- the fluid electrode material may be supplied to the entire surface of the sheet.
- FIG. 13 has the same configuration as FIG. 12 except that the channel region formed of the organic semiconductor layer 3 is formed on the line of the fluid electrode material repulsion region 6.
- the insulating region 6 is formed by the electrostatic suction type ink jet device.
- the gate electrode is formed by branching from the gate bus line 11, and a channel region made of the organic semiconductor layer 3 is provided at the branch portion.
- FIG. 15 is the same as FIG. 14 except that the capacitor line 22 is provided so as to face the gate bus line 11.
- a channel region (also referred to as a layer) that also has a semiconductor layer force constituting the thin film transistor element.
- Crossed includes a state in which a gate bus line and a channel region formed of a semiconductor layer are in contact with each other.
- the layer formation by the ink jet method including the electrostatic attraction type ink jet apparatus described above is performed while transporting the support of the thin film transistor or the support of the thin film transistor element sheet.
- the constituent materials of the source electrode, the drain electrode, the source bus line, and the gate bus line are the force in which the above electrode material is used.
- the conductive paste mainly composed of conductive polymer and metal fine particles.
- ink for example, an aqueous dispersion of polystyrene sulfonic acid and poly (ethylenedioxythiophene) (Baytron P manufactured by Bayer), a silver paste or a metal described in JP-A-11-80647 An aqueous dispersion of fine particles is preferably used.
- the thin film transistor element sheet is manufactured by the manufacturing method described above.
- FIG. 16 is a structural diagram of a thin film transistor element.
- the electric circuit 100 of the present invention has the organic thin film transistor element shown in FIG. 16, and includes a support 1, a gate electrode 2, an insulating layer 2a, an organic semiconductor layer 3, a protective layer (intermediate layer) 3a, a drain •
- the materials, configurations, and formation methods of the source electrodes 4 and 5, the insulating region 6, the image receiving layer 7, and the like are the same as the materials, configurations, and formation methods of the above-described thin film transistors and thin film transistor element sheets.
- the thin film transistor element in the electric circuit 100 has at least the gate electrode 2, the organic semiconductor layer 3, the source electrode 5, and the drain electrode 4 on the support 1. And forming the insulating region 6 having electrode material repellent property by the electrostatic attraction type ink jet apparatus with a capacity of 1 to 400 fl per droplet of ejected droplets, and then the fluidic electrode in the insulating region 6 Supplying the material, the flowable electrode material is divided at the insulating region 6, thereby having an organic thin film semiconductor manufactured through a process in which each of the source electrode 5 and the drain electrode 4 is formed.
- the insulating region 6 contains silicon rubber, and the insulating region forming material is used as the receiving layer.
- 7 is an electric circuit having a thin film transistor element formed by a process of supplying a source electrode 5 and a drain electrode 4 to a receiving layer 7.
- the method further includes the step of forming the insulating region 6 on the organic semiconductor layer 3 containing the organic semiconductor material, and an intermediate layer 3a is provided between the insulating region 6 and the organic semiconductor layer 3. Talk to you.
- FIGS. 1A and 1B As described below, a bottom gate type thin film transistor having a layer structure as shown in FIG. 1B was fabricated. In addition, the manufacturing procedure of the thin film transistor is shown in FIGS.
- FIG. 1 (b) and FIG. 5 (7) show the same configuration.
- a gate electrode 2, a gate insulating layer 2a, and an organic semiconductor layer 3 were formed on the support 1 as described below to obtain a layer structure as shown in (1) of FIG.
- a corona discharge treatment was applied to the surface of the support 1 made of PES film with a thickness of 200 ⁇ m under the condition of 50 WZm 2 Z, and a coating solution having the following composition was applied to a dry film thickness of 2 m, and 90 ° After drying at C for 5 minutes, a distance force of 10 cm under a 60 WZcm high-pressure mercury lamp was also cured for 4 seconds.
- Methyl ethyl ketone 75g Further, 75 g of methylpropylene glycol was continuously plasma-treated under atmospheric pressure on the layer under the following conditions to provide an oxide film having a thickness of 50 nm to form an undercoat layer (not shown).
- Inert gas helium 98.25 volume 0/0
- Reactive gas Oxygen gas 1.5% by volume
- Reactive gas Tetraethoxysilane vapor (published with helium gas) 0.25 vol% (discharge conditions)
- the electrode is coated with lmm of alumina by ceramic spraying on a stainless jacket roll base material having cooling means with cooling water, and then a solution obtained by diluting tetramethoxysilane with ethyl acetate is applied and dried, and then sealed by ultraviolet irradiation.
- This is a roll electrode that has a dielectric (dielectric constant 10) adjusted to have a surface roughness (Rmax) of 5 m as defined in JIS B 0601, with a smooth surface, and a surface roughness (Rmax) of 5 m.
- Rmax surface roughness
- a hollow rectangular stainless steel pipe was covered with the same dielectric as described above under the same conditions.
- a photosensitive resin 1 having the following composition was applied and dried at 100 ° C. for 1 minute to form a photosensitive resin layer having a thickness of 2 m.
- (Photosensitive rosin 1) Dye A 7 parts
- the gate electrode pattern was exposed with an energy density of 200 nijZcm 2 with a semiconductor laser with an oscillation wavelength of 830 nm and an output of lOOmW, and then developed with an alkaline aqueous solution to obtain a resist image.
- a 300 nm-thick aluminum film was formed on the entire surface by sputtering, and then the remaining part of the photosensitive resin layer was removed with MEK, whereby gate electrode 2 was produced. did.
- the thickness of the anodic oxide film is 120 nm using a direct current supplied from a 100 V constant voltage power supply in 50 g ZL aqueous ammonium borate solution for 5 minutes.
- An anodic acid coating (not shown) was prepared so as to be washed thoroughly with ultrapure water.
- the gas used in the above atmospheric pressure plasma method was changed to the following to provide a gate insulating layer 2a, which is an oxide layer having a thickness of 30 nm.
- Inert gas helium 98.25 volume 0/0
- Reactive gas Oxygen gas 1.5% by volume
- Reactive gas Tetraethoxysilane vapor (published with helium gas) 0.25 vol% Surface treatment with HMDS (hexamethyldisilazane) was performed on the surface of the gate insulating layer.
- a black mouth form solution of a compound (pentacene precursor) described in US Publication No. US20030136964 is discharged to a region where a channel is to be formed by using a piezo ink jet method. Then, it was dried in nitrogen gas at 50 ° C. for 3 minutes and subjected to heat treatment at 200 ° C. for 10 minutes to form an organic semiconductor layer 3 which is a pentacene thin film having a thickness of 50 nm.
- Step (2) (3) and (4) in FIG. 5: Formation of insulating region 6
- the following composition 2 is applied to the organic semiconductor layer 3 with a solid solvent concentration of Xisopar E "(isoparaffinic hydrocarbon, manufactured by Exxon Chemical Co., Ltd.) as a single solvent.
- Electrostatic suction type ink jet device that has a nozzle diluted to 3% by mass and a nozzle with an inner diameter of 5 m
- the ink droplet 6 a is ejected and then dried to form an insulating region (layer) 6 having a silicon rubber force of 3 ⁇ m width as shown in FIG. 5 (4). It was formed in the receiving layer 7.
- Fig. 1 (b) and Fig. 5 (7) have the same configuration.
- the method for preparing the coating liquid for forming the receiving layer 7 is as follows.
- Colloidal silica (Nissan Chemical Industry Co., Ltd .: primary particle size ⁇ ! ⁇ 20nm, 20% aqueous dispersion) AEROSIL300 (primary particle size 7 nm) made by Nippon Aerosil Co., Ltd., a vapor phase silica in 3 kg After 6kg was dispersed by suction, pure water was added to prepare a 7L dispersion. Further, 0.7 L of an aqueous solution containing 27 g of boric acid and 23 g of borax was added, and an antifoaming agent (SN381: manufactured by San Nopco) was added to the lg.
- AEROSIL300 primary particle size 7 nm
- a silica mixed water dispersion was prepared by dispersing twice with a high-pressure homogenizer at a pressure of 2.45 X 10 7 Pa. While stirring at 40 ° C, 1 L of this silica mixed water dispersion was mixed with 1 L of a 5% aqueous solution of polybutyl alcohol to prepare a receiving layer coating solution. The coating liquid was ejected as ink droplets on the surface of the organic semiconductor layer by a piezo-type ink jet device and dried at 100 ° C. in nitrogen gas to form a 0.3 / zm-thick receiving layer.
- Baytron P is ejected as ink droplets 8 by the above-mentioned ink jet device, and Fig. 5 ( 6)
- the ink droplets 8a and 8b are separated on both sides of the insulating region 6, the ink droplets 8a and 8b are dried at 60 ° C., and as shown in FIG. 5 (7), the source electrode 5 and the drain electrode 6 each made
- Fig. 5 (5) the electrode forming material immediately after ejection is present as ink droplet 8 on both the insulating region 6 and the organic semiconductor layer 3, but after a predetermined time has elapsed, Fig. 5 As shown in (6), the ink droplet 8 a and the ink droplet 8 b are divided on both sides of the region 6 due to the electrode material repulsion of the insulating region 6. Finally, the ink droplet 8 a forms the drain electrode 4 on the source electrode 5 and the ink droplet 8 b on the source electrode 5.
- a thin film transistor was manufactured as described above.
- the obtained thin film transistor showed good operating characteristics of the p-channel enhancement type FET, and the carrier mobility in the saturation region was 0.2.
- Vd source drain noise
- Vg gate bias
- drain current ratio on Zoff ratio
- a thin film transistor element sheet having the configuration shown in FIGS. 11 to 14 was produced as described below.
- the gate bus line 11 (when the gate bus line also serves as the gate electrode, the gate electrode is not shown) and the organic semiconductor layer 3 were provided as follows. (Preparation of support 1)
- the photosensitive resin 1 of Example 1 was applied in the same manner as in Example 1, and dried at 100 ° C for 1 minute, so that the photosensitive film having a thickness of 2 m was obtained. A fat layer was formed.
- (Photosensitive oil 1) The gate bus line and gate electrode patterns were exposed with an energy density of 200 nijZcm 2 with a semiconductor laser with an oscillation wavelength of 830 nm and an output of lOOmW, and then developed with an alkaline aqueous solution to obtain a resist image.
- anodic acid coating was prepared in a 50 g ZL aqueous solution of ammonium borate for 5 minutes using a direct current supplied from a 100 V constant voltage power supply. Washed thoroughly with pure water.
- Example 2 a gate insulating layer which is a 30 nm thick oxide layer was provided at a film temperature of 200 ° C., and HMDS treatment was performed in the same manner.
- the above-mentioned chloroform solution is discharged to the region where the channel is to be formed by using a piezo-type ink jet method, and in nitrogen gas, After drying at ° C for 3 minutes and heat treatment at 200 ° C for 10 minutes, an organic semiconductor layer 3 which is a 50 nm thick pentacene thin film was formed.
- the organic semiconductor layer 3 is coated with an aqueous solution obtained by dissolving sufficiently purified polybulualcohol in water purified by an ultrapure production device, and dried well at 100 ° C in a nitrogen gas atmosphere.
- An intermediate layer having a polyvinyl alcohol power was also formed.
- composition 2 a liquid obtained by diluting the following composition 2 with a single solvent, Isopar E "(isoparaffinic hydrocarbon, manufactured by Eksony Chemical Co., Ltd.), was subjected to ink discharge using an electrostatic suction ink jet apparatus having a nozzle having an inner diameter of 5 ⁇ m. After discharging the droplet, it was dried and cured to form a fluid electrode material repulsion region (layer) 6, A, B made of silicon rubber with a width of 3 m. (Composition of composition 2)
- SRX 212 Platinum catalyst, manufactured by Toray Dowco-Ning Silicon Co., Ltd.
- the intermediate layer other than the region where the fluid electrode material repulsion regions 6, A, and B were provided was removed by water treatment or the like, and rinsed thoroughly with ultrapure water.
- Step (3) Formation of source electrode 5, drain electrode 4, pixel electrode 4a, and source bus line
- An electrode forming material 0.01 wt 0/0 Roh - one surfactant (e.g., - such Kkokemika Girls made NP 15) and a polystyrene sulfonic acid was ⁇ Ka ⁇ poly (ethylenedioxythiophene O carboxymethyl Chi off E down)
- An aqueous dispersion of (Bayer Baytron P) was applied, and when the coating film was divided by the flowable electrode material repulsion regions 6, A, B, it was dried at 60 ° C, and the electrode having a thickness of 0.2 m A coating film of the forming material was formed.
- a silver paste is applied, and when the coating film is divided by the flowable electrode material repulsion region 6, A and B, the film is dried at 60 ° C and heat-treated at 200 ° C to obtain a film thickness of 2 m. A silver paste film was formed.
- the channel region is formed by the lines of the insulating region 6 formed on the element sheet, and the regions 20 and 21 are formed by simultaneously forming the A and B lines.
- the fluid electrode material is supplied to the region 20 to form the source electrode and the source bus line, and the fluid electrode material is supplied to the region 21 to form the drain electrode 4 and the pixel electrode 4a. Further, the region 21 forms a storage capacitor with the adjacent gate bus line.
- a thin film transistor that exhibits the above-described effects can be easily and efficiently produced without using a vacuum system or photolithography that requires sophisticated vacuum equipment or complicated processing steps.
- a method for manufacturing a thin film transistor with high manufacturing stability can be provided.
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Cited By (7)
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JP2008258206A (ja) * | 2007-03-30 | 2008-10-23 | Dainippon Printing Co Ltd | 有機半導体素子の製造方法 |
JP2009182329A (ja) * | 2008-01-29 | 2009-08-13 | Korea Inst Of Science & Technology | ゾル−ゲル及び光硬化反応により光硬化透明高分子内に金属酸化物ナノ粒子を含むゲート絶縁層を用いる有機薄膜トランジスタ及びその製造方法 |
JP2009239169A (ja) * | 2008-03-28 | 2009-10-15 | Konica Minolta Holdings Inc | 有機薄膜トランジスタの製造方法 |
JPWO2008093663A1 (ja) * | 2007-01-31 | 2010-05-20 | コニカミノルタホールディングス株式会社 | 有機薄膜トランジスタ、その製造方法及び有機半導体デバイス |
JP2010182776A (ja) * | 2009-02-04 | 2010-08-19 | Konica Minolta Holdings Inc | 導電膜パターンおよび導電膜パターンの形成方法 |
JP2015026810A (ja) * | 2013-07-29 | 2015-02-05 | 三星ディスプレイ株式會社Samsung Display Co.,Ltd. | 薄膜トランジスタ基板、これの製造方法及びこれを含む表示装置 |
JP2015167246A (ja) * | 2006-12-22 | 2015-09-24 | パロ・アルト・リサーチ・センター・インコーポレーテッドPalo Alto Research Center Incorporated | トランジスタ形成方法及び電子デバイス用中間形成物 |
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GB2379083A (en) * | 2001-08-20 | 2003-02-26 | Seiko Epson Corp | Inkjet printing on a substrate using two immiscible liquids |
US8932666B2 (en) * | 2002-09-24 | 2015-01-13 | National Institute Of Advanced Industrial Science And Technology | Method and apparatus for manufacturing active-matrix organic el display, active matrix organic el display, method for manufacturing liquid crystal array, liquid crystal array, method and apparatus for manufacturing color filter substrate, and color filter substrate |
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JP2004031933A (ja) * | 2002-05-09 | 2004-01-29 | Konica Minolta Holdings Inc | 有機薄膜トランジスタの製造方法及び、それにより製造された有機薄膜トランジスタと有機薄膜トランジスタシート |
JP2004095896A (ja) * | 2002-08-30 | 2004-03-25 | Sharp Corp | パターン形成基材およびパターン形成方法 |
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JP2015167246A (ja) * | 2006-12-22 | 2015-09-24 | パロ・アルト・リサーチ・センター・インコーポレーテッドPalo Alto Research Center Incorporated | トランジスタ形成方法及び電子デバイス用中間形成物 |
JPWO2008093663A1 (ja) * | 2007-01-31 | 2010-05-20 | コニカミノルタホールディングス株式会社 | 有機薄膜トランジスタ、その製造方法及び有機半導体デバイス |
JP2008258206A (ja) * | 2007-03-30 | 2008-10-23 | Dainippon Printing Co Ltd | 有機半導体素子の製造方法 |
JP2009182329A (ja) * | 2008-01-29 | 2009-08-13 | Korea Inst Of Science & Technology | ゾル−ゲル及び光硬化反応により光硬化透明高分子内に金属酸化物ナノ粒子を含むゲート絶縁層を用いる有機薄膜トランジスタ及びその製造方法 |
JP2009239169A (ja) * | 2008-03-28 | 2009-10-15 | Konica Minolta Holdings Inc | 有機薄膜トランジスタの製造方法 |
JP2010182776A (ja) * | 2009-02-04 | 2010-08-19 | Konica Minolta Holdings Inc | 導電膜パターンおよび導電膜パターンの形成方法 |
JP2015026810A (ja) * | 2013-07-29 | 2015-02-05 | 三星ディスプレイ株式會社Samsung Display Co.,Ltd. | 薄膜トランジスタ基板、これの製造方法及びこれを含む表示装置 |
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JPWO2006033282A1 (ja) | 2008-05-15 |
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