WO2016158406A1 - 薄膜トランジスタ用感光性樹脂組成物、硬化膜、薄膜トランジスタ、液晶表示装置または有機電界発光表示装置、硬化膜の製造方法、薄膜トランジスタの製造方法および液晶表示装置または有機電界発光表示装置の製造方法 - Google Patents
薄膜トランジスタ用感光性樹脂組成物、硬化膜、薄膜トランジスタ、液晶表示装置または有機電界発光表示装置、硬化膜の製造方法、薄膜トランジスタの製造方法および液晶表示装置または有機電界発光表示装置の製造方法 Download PDFInfo
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- WO2016158406A1 WO2016158406A1 PCT/JP2016/058272 JP2016058272W WO2016158406A1 WO 2016158406 A1 WO2016158406 A1 WO 2016158406A1 JP 2016058272 W JP2016058272 W JP 2016058272W WO 2016158406 A1 WO2016158406 A1 WO 2016158406A1
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
- G03F7/032—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders
- G03F7/037—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders the binders being polyamides or polyimides
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133345—Insulating layers
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/0048—Photosensitive materials characterised by the solvents or agents facilitating spreading, e.g. tensio-active agents
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/022—Quinonediazides
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/022—Quinonediazides
- G03F7/0226—Quinonediazides characterised by the non-macromolecular additives
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/022—Quinonediazides
- G03F7/023—Macromolecular quinonediazides; Macromolecular additives, e.g. binders
- G03F7/0233—Macromolecular quinonediazides; Macromolecular additives, e.g. binders characterised by the polymeric binders or the macromolecular additives other than the macromolecular quinonediazides
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/075—Silicon-containing compounds
- G03F7/0755—Non-macromolecular compounds containing Si-O, Si-C or Si-N bonds
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/16—Coating processes; Apparatus therefor
- G03F7/168—Finishing the coated layer, e.g. drying, baking, soaking
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/40—Treatment after imagewise removal, e.g. baking
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D30/00—Field-effect transistors [FET]
- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/67—Thin-film transistors [TFT]
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D30/00—Field-effect transistors [FET]
- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/67—Thin-film transistors [TFT]
- H10D30/6729—Thin-film transistors [TFT] characterised by the electrodes
- H10D30/6737—Thin-film transistors [TFT] characterised by the electrodes characterised by the electrode materials
- H10D30/6739—Conductor-insulator-semiconductor electrodes
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D86/00—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
- H10D86/40—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D86/00—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
- H10D86/40—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs
- H10D86/451—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs characterised by the compositions or shapes of the interlayer dielectrics
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D86/00—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
- H10D86/40—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs
- H10D86/60—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs wherein the TFTs are in active matrices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/85—Packages
- H10H20/852—Encapsulations
- H10H20/854—Encapsulations characterised by their material, e.g. epoxy or silicone resins
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- 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
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- 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
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- 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]
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
- H10K59/1213—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being TFTs
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133305—Flexible substrates, e.g. plastics, organic film
Definitions
- the present invention relates to a photosensitive resin composition for thin film transistors, a cured film, a thin film transistor, a liquid crystal display device or an organic electroluminescent display device, a method for producing a cured film, a method for producing a thin film transistor, and a method for producing a liquid crystal display device or an organic electroluminescent display device.
- a photosensitive resin composition for thin film transistors a cured film, a thin film transistor, a liquid crystal display device or an organic electroluminescent display device.
- Display devices such as liquid crystal and organic EL are mainly driven by an active matrix driving system in which a thin film transistor (hereinafter sometimes referred to as TFT) is arranged and driven in each pixel.
- TFT thin film transistor
- various insulating layers such as a gate insulating layer and an interlayer insulating layer used in a TFT are manufactured by depositing an inorganic material such as silicon nitride or silicon oxide by a vapor deposition method.
- the vapor deposition method has a problem that the vacuum equipment necessary for vapor deposition is very expensive. Furthermore, in order to pattern the deposited inorganic film, complicated steps such as application of resist material, exposure, development, etching of the inorganic material, and removal of the resist material must be performed. In addition, in a flexible display using a plastic substrate that has been actively developed in recent years, there has been a problem that a conventional insulating layer using an inorganic material is easily cracked and has insufficient durability.
- Patent Documents 1 and 2 As a photosensitive resin composition for a TFT insulating layer, for example, a material using a polyimide resin has been proposed from the viewpoint of heat resistance (Patent Documents 1 and 2).
- an object of the present invention is to provide a photosensitive resin composition for a thin film transistor, in which an outgas generated from a cured film is extremely small and an insulating layer for a thin film transistor excellent in driving performance can be formed.
- the present invention is a photosensitive resin composition for a thin film transistor comprising (A) an alkali-soluble resin having an amide group and / or an imide group, (B) a photosensitive compound, and (C) an organic solvent. It is the photosensitive resin composition for thin film transistors whose content of the organic solvent which has a nitrogen atom in an organic solvent is 1 mass% or less with respect to the organic solvent whole quantity.
- a photosensitive resin composition for a thin film transistor that can form an insulating layer for a thin film transistor that has very little outgas generated from a cured film and is excellent in driving performance.
- the resin composition for a thin film transistor of the present invention is a photosensitive resin composition for a thin film transistor containing (A) an alkali-soluble resin having an amide group and / or an imide group, (B) a photosensitive compound, and (C) an organic solvent. Yes, in the organic solvent (C), the content of the organic solvent having a nitrogen atom is 1% by mass or less based on the total amount of the organic solvent.
- the photosensitive resin composition for a thin film transistor of the present invention contains (A) an alkali-soluble resin having an amide group and / or an imide group.
- alkali-soluble means that a solution in which a resin is dissolved in ⁇ -butyrolactone is applied on a silicon wafer and prebaked at 120 ° C. for 4 minutes to form a prebaked film having a thickness of 10 ⁇ m ⁇ 0.5 ⁇ m.
- the dissolution rate obtained from the reduction in film thickness when the membrane is immersed in a 2.38 mass% tetramethylammonium hydroxide aqueous solution at 23 ⁇ 1 ° C. for 1 minute and then rinsed with pure water is 50 nm / min or more.
- alkali-soluble resin having an amide group and / or an imide group examples include, but are not limited to, polyimide, polyimide precursor, polybenzoxazole, polybenzoxazole precursor, polyaminoamide, and polyamide. You may contain 2 or more types of these resin. Among these alkali-soluble resins, those having excellent heat resistance and a small amount of outgas at high temperature are preferable. Specifically, at least one alkali-soluble resin selected from polyimides, polyimide precursors, and polybenzoxazole precursors or copolymers thereof are preferable.
- the alkali-soluble resin or copolymer thereof selected from (A) polyimide, polyimide precursor, and polybenzoxazole precursor that can be used as the alkali-soluble resin having an amide group and / or an imide group of the present invention is In order to impart the alkali solubility, it is preferable to have an acidic group in the structural unit of the resin and / or at the end of the main chain. Examples of the acidic group include a carboxyl group, a phenolic hydroxyl group, a sulfonic acid group, and a thiol group.
- the alkali-soluble resin or copolymer thereof preferably has a fluorine atom.
- the alkali-soluble resin or copolymer thereof When developing with an alkaline aqueous solution, the alkali-soluble resin or copolymer thereof imparts water repellency to the interface between the film and the substrate, Infiltration can be suppressed.
- the content of fluorine atoms in the alkali-soluble resin or copolymer thereof is preferably 5% by mass or more from the viewpoint of preventing the penetration of the alkaline aqueous solution into the interface, and 20% by mass or less from the viewpoint of solubility in the alkaline aqueous solution. preferable.
- the above polyimide preferably has a structural unit represented by the following general formula (1)
- the polyimide precursor and the polybenzoxazole precursor preferably have a structural unit represented by the following general formula (2). Two or more of these may be contained, or a resin obtained by copolymerizing the structural unit represented by the general formula (1) and the structural unit represented by the general formula (2) may be used.
- R 1 represents a 4- to 10-valent organic group
- R 2 represents a 2- to 8-valent organic group
- R 3 and R 4 represent a phenolic hydroxyl group, a carboxy group, a sulfonic acid group, or a thiol group, and each may be a single group or a different group.
- p and q represent an integer of 0-6.
- R 5 represents a divalent to octavalent organic group
- R 6 represents a divalent to octavalent organic group
- R 7 and R 8 represent a phenolic hydroxyl group, a sulfonic acid group, a thiol group, or COOR 9 , and each may be a single one or different ones.
- R 9 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 20 carbon atoms.
- r and s each represent an integer of 0 to 6. However, r + s> 0.
- Alkali-soluble resins selected from polyimides, polyimide precursors, and polybenzoxazole precursors or copolymers thereof have a structural unit represented by the general formula (1) or (2) in a range of 5 to 100,000. It is preferable. Further, in addition to the structural unit represented by the general formula (1) or (2), another structural unit may be included. In this case, it is preferable that the structural unit represented by the general formula (1) or (2) has 50 mol% or more of the total number of structural units.
- R 1- (R 3 ) p represents a residue of acid dianhydride.
- R 1 is a tetravalent to 10-valent organic group, and among them, an organic group having 5 to 40 carbon atoms containing an aromatic ring or a cyclic aliphatic group is preferable.
- the acid dianhydride examples include pyromellitic dianhydride, 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride, 2,3,3 ′, 4′-biphenyltetracarboxylic Acid dianhydride, 2,2 ′, 3,3′-biphenyltetracarboxylic dianhydride, 3,3 ′, 4,4′-benzophenone tetracarboxylic dianhydride, 2,2 ′, 3,3 ′ -Benzophenone tetracarboxylic dianhydride, 2,2-bis (3,4-dicarboxyphenyl) propane dianhydride, 2,2-bis (2,3-dicarboxyphenyl) propane dianhydride, 1,1 -Bis (3,4-dicarboxyphenyl) ethane dianhydride, 1,1-bis (2,3-dicarboxyphenyl) ethane dianhydride, bis (3,4-dicar
- R 10 represents an oxygen atom, C (CF 3 ) 2 , or C (CH 3 ) 2 .
- R 11 and R 12 represent a hydrogen atom or a hydroxyl group.
- R 5- (R 7 ) r represents an acid residue.
- R 5 is a divalent to octavalent organic group, preferably an organic group having 5 to 40 carbon atoms containing an aromatic ring or a cycloaliphatic group.
- the acid component examples include dicarboxylic acids such as terephthalic acid, isophthalic acid, diphenyl ether dicarboxylic acid, bis (carboxyphenyl) hexafluoropropane, biphenyl dicarboxylic acid, benzophenone dicarboxylic acid, and triphenyl dicarboxylic acid.
- dicarboxylic acids such as terephthalic acid, isophthalic acid, diphenyl ether dicarboxylic acid, bis (carboxyphenyl) hexafluoropropane, biphenyl dicarboxylic acid, benzophenone dicarboxylic acid, and triphenyl dicarboxylic acid.
- tetracarboxylic acids such as acid, trimesic acid, diphenyl ether tricarboxylic acid, biphenyl tricarboxylic acid, pyromellitic acid, 3,3 ′, 4,4′-biphenyltetracarboxylic acid, 2,3,3 ′, 4′-biphenyl Tetracarboxylic acid, 2,2 ′, 3,3′-biphenyltetracarboxylic acid, 3,3 ′, 4,4′-benzophenone tetracarboxylic acid, 2,2 ′, 3,3′-benzophenone tetracarboxylic acid, 2 , 2-bis (3,4-dica Boxyphenyl) hexafluoropropane, 2,2-bis (2,3-dicarboxyphenyl) hexafluoropropane, 1,1-bis (3,4-dicarboxyphenyl) ethane, 1,1-bis (2,3- Dicarboxy
- R 10 represents an oxygen atom, C (CF 3 ) 2 , or C (CH 3 ) 2 .
- R 11 and R 12 represent a hydrogen atom or a hydroxyl group.
- one or two carboxyl groups correspond to the R 7 group in the general formula (2). Further, it is more preferable to substitute one to four hydrogen atoms of the dicarboxylic acid, tricarboxylic acid and tetracarboxylic acid exemplified above with R 7 groups in the general formula (2), preferably phenolic hydroxyl groups.
- R 7 groups in the general formula (2) preferably phenolic hydroxyl groups.
- R 2 — (R 4 ) q in the general formula (1) and R 6 — (R 8 ) s in the general formula (2) represent a diamine residue.
- R 2 and R 8 are divalent to octavalent organic groups, and among them, an organic group having 5 to 40 carbon atoms containing an aromatic ring or a cyclic aliphatic group is preferable.
- diamines include 3,4'-diaminodiphenyl ether, 4,4'-diaminodiphenyl ether, 3,4'-diaminodiphenylmethane, 4,4'-diaminodiphenylmethane, 1,4-bis (4-amino Phenoxy) benzene, benzidine, m-phenylenediamine, p-phenylenediamine, 1,5-naphthalenediamine, 2,6-naphthalenediamine, bis (4-aminophenoxy) biphenyl, bis ⁇ 4- (4-aminophenoxy) phenyl ⁇ Ether, 1,4-bis (4-aminophenoxy) benzene, 2,2′-dimethyl-4,4′-diaminobiphenyl, 2,2′-diethyl-4,4′-diaminobiphenyl, 3,3 ′ -Dimethyl-4,4'-diaminobiphenyl, 3,3
- R 10 represents an oxygen atom, C (CF 3 ) 2 , or C (CH 3 ) 2 .
- R 11 to R 14 each independently represents a hydrogen atom or a hydroxyl group.
- diamines can be used as diamines or as corresponding diisocyanate compounds or trimethylsilylated diamines.
- Preferred examples of the monoamine having an acidic group include 5-amino-8-hydroxyquinoline, 1-hydroxy-7-aminonaphthalene, 1-hydroxy-6-aminonaphthalene, 1-hydroxy-5-aminonaphthalene, 1-hydroxy -4-aminonaphthalene, 2-hydroxy-7-aminonaphthalene, 2-hydroxy-6-aminonaphthalene, 2-hydroxy-5-aminonaphthalene, 1-carboxy-7-aminonaphthalene, 1-carboxy-6-aminonaphthalene 1-carboxy-5-aminonaphthalene, 2-carboxy-7-aminonaphthalene, 2-carboxy-6-aminonaphthalene, 2-carboxy-5-aminonaphthalene, 2-aminobenzoic acid, 3-aminobenzoic acid, 4 -Aminobenzoic acid, 4-aminosalicylic acid, 5-a Nosalicylic acid, 6-aminosalicylic acid, 3-amino-4,6-d
- Preferred examples of the acid anhydride, acid chloride, and monocarboxylic acid include phthalic anhydride, maleic anhydride, nadic acid anhydride, cyclohexanedicarboxylic acid anhydride, acid anhydrides such as 3-hydroxyphthalic acid anhydride, 3- Carboxyphenol, 4-carboxyphenol, 3-carboxythiophenol, 4-carboxythiophenol, 1-hydroxy-7-carboxynaphthalene, 1-hydroxy-6-carboxynaphthalene, 1-hydroxy-5-carboxynaphthalene, 1-mercapto Monocarboxylic acids such as -7-carboxynaphthalene, 1-mercapto-6-carboxynaphthalene, 1-mercapto-5-carboxynaphthalene, etc., and monoacid chlorides, terephthalic acid, phthalic acid, maleic acid in which these carboxyl groups are converted to acid chlorides acid Only one carboxyl group of dicarboxylic acids such as cyclo
- the content of the end-capping agent such as monoamine, acid anhydride, monocarboxylic acid, monoacid chloride, monoactive ester and the like is 2 to 2% with respect to 100 mol% of the total of the acid component and amine component constituting the resin. 25 mol% is preferred.
- the end-capping agent introduced into the resin can be easily detected by the following method.
- a resin having a terminal blocking agent introduced therein is dissolved in an acidic solution and decomposed into an amine component and an acid component, which are constituent units of the resin, and this is measured by gas chromatography (GC) or NMR measurement.
- GC gas chromatography
- NMR nuclear magnetic resonance
- the alkali-soluble resin having an amide group and / or an imide group used in the present invention can be synthesized by a known method.
- polyamic acid or polyamic acid ester as a production method, for example, a method of reacting a tetracarboxylic dianhydride and a diamine compound at a low temperature, a diester is obtained by tetracarboxylic dianhydride and alcohol, and then an amine and a condensing agent It can be synthesized by a method in which a diester is obtained by reacting in the presence of, a tetracarboxylic dianhydride and an alcohol, and then the remaining dicarboxylic acid is acid chlorideed and reacted with an amine.
- the production method can be obtained, for example, by subjecting a bisaminophenol compound and a dicarboxylic acid to a condensation reaction. Specifically, a dehydrating condensing agent such as dicyclohexylcarbodiimide (DCC) is reacted with an acid, and a bisaminophenol compound is added thereto, or a solution of a bisaminophenol compound added with a tertiary amine such as pyridine is added to a dicarboxylic acid. For example, a solution of dichloride is dropped.
- a dehydrating condensing agent such as dicyclohexylcarbodiimide (DCC)
- DCC dicyclohexylcarbodiimide
- the production method can be obtained, for example, by subjecting the polyamic acid or polyamic acid ester obtained by the above-mentioned method to dehydration and ring closure by heating or chemical treatment such as acid or base.
- the photosensitive resin composition for a thin film transistor of the present invention contains (B) a photosensitive compound.
- the photosensitive compound is a compound whose chemical structure changes in response to ultraviolet rays, and specific examples include a photoacid generator, a photobase generator, and a photoradical generator.
- the photoacid generator generates an acid in the light irradiation part and increases the solubility of the light irradiation part in the alkaline aqueous solution, so that a positive pattern in which the light irradiation part dissolves can be obtained.
- the photobase generator generates a base in the light irradiation part and decreases the solubility of the light irradiation part in the alkaline aqueous solution, so that a negative pattern in which the light irradiation part becomes insoluble can be obtained.
- the photoradical generator generates radicals in the light irradiation area, and when used in combination with radical reactive compounds such as ethylene double bonds, the light irradiation area is less soluble in an alkaline aqueous solution. A negative pattern that is insolubilized can be obtained.
- a photoacid generator is preferable because a highly sensitive and high resolution pattern can be easily obtained.
- the photoacid generator include quinonediazide compounds, sulfonium salts, phosphonium salts, diazonium salts, and iodonium salts.
- the photosensitive compound (B) is more preferably a quinonediazide compound because it is easy to obtain a high-sensitivity and high-resolution pattern without undergoing heat treatment after exposure.
- quinonediazide compound a compound in which a sulfonic acid of naphthoquinonediazidesulfonic acid is bonded with an ester to a compound having a phenolic hydroxyl group is preferable.
- the compound having a phenolic hydroxyl group used here Bis-Z, BisP-EZ, TekP-4HBPA, TrisP-HAP, TrisP-PA, TrisP-SA, TrisOCR-PA, BisOCHP-Z, BisP-MZ, BisP -PZ, BisP-IPZ, BisOCP-IPZ, BisP-CP, BisRS-2P, BisRS-3P, BisP-OCHP, Methylenetris-FR-CR, BisRS-26X, DML-MBPC, DML-MBOC, DML-OCHP, DML-PCHP, DML-PC, DML-PTBP, DML-34X, DML-EP, DML-POP, dimethylol-BisOC-P, DML-P
- quinonediazide compound used in the present invention include those obtained by introducing 4-naphthoquinonediazidesulfonic acid or 5-naphthoquinonediazidesulfonic acid into the compound having a phenolic hydroxyl group by an ester bond. Other compounds can also be used.
- 4-Naphthoquinonediazide sulfonyl ester compounds have absorption in the i-line region of mercury lamps and are suitable for i-line exposure.
- the 5-naphthoquinonediazide sulfonyl ester compound has an absorption extending to the g-line region of a mercury lamp and is suitable for g-line exposure.
- either a 4-naphthoquinone diazide sulfonyl ester compound or a 5-naphthoquinone diazide sulfonyl ester compound can be preferably used, but depending on the wavelength of exposure, a 4-naphthoquinone diazide sulfonyl ester compound or a 5-naphthoquinone diazide sulfonyl ester compound Is preferably selected.
- a naphthoquinone diazide sulfonyl ester compound can be obtained by using a 4-naphthoquinone diazide sulfonyl group and a 5-naphthoquinone diazide sulfonyl group in the same molecule, or a 4-naphthoquinone diazide sulfonyl ester compound and a 5-naphthoquinone diazide sulfonyl ester compound. Can also be used in combination.
- the quinonediazide compound includes a 4-naphthoquinonediazide sulfonyl ester compound.
- the quinonediazide structure and the sulfonylester structure of the 4-naphthoquinonediazidesulfonylester compound are more easily thermally decomposed than those of the 5-naphthoquinonediazidesulfonylester compound. Therefore, by including the 4-naphthoquinone diazide sulfonyl ester compound, components having low heat resistance are removed from the film in the heat curing step, and the outgas-derived components remaining in the cured film can be easily reduced.
- the content of the 4-naphthoquinone diazide sulfonyl ester compound in the entire content of the photosensitive compound is preferably 50% by mass or more, more preferably 70% by mass, and further preferably 100% by mass.
- the naphthoquinone diazide sulfonyl ester compound can be synthesized by an esterification reaction between a compound having a phenolic hydroxyl group and a naphthoquinone diazide sulfonic acid compound, and can be synthesized by a known method.
- the resolution, sensitivity, and remaining film ratio are further improved.
- the content of the photosensitive compound (B) used in the present invention is preferably 0.1 parts by mass or more, more preferably 100 parts by mass of the alkali-soluble resin (A) having an amide group and / or an imide group. 1 mass part or more, More preferably, it is 2 mass parts or more, Preferably it is 20 mass parts or less, More preferably, it is 14 mass parts or less, More preferably, it is 10 mass parts or less.
- the photosensitive resin composition for a thin film transistor of the present invention contains (C) an organic solvent.
- the organic solvent may be a single solvent or a mixed solvent of two or more, but it is essential that the content of the organic solvent having a nitrogen atom is 1% by mass or less based on the total amount of the organic solvent.
- the inventors have determined that the organic solvent having a nitrogen atom has an affinity for (A) an amide group and / or an imide group contained in the resin skeleton of the alkali-soluble resin having an amide group and / or an imide group. It was found that the organic solvent is difficult to remove in the thermosetting process even if it is contained in a small amount because the organic solvent remains in the insulating layer after curing, and the driving performance of the thin film transistor is lowered particularly at high temperatures. .
- organic solvent having a nitrogen atom examples include those having a functional group such as an amide group, a urethane group, and a urea group. Specific examples include 2-pyrrolidone, N-methyl-2-pyrrolidone, and N-ethyl-2.
- any of the organic solvents having a nitrogen atom is highly polar, and (A) the alkali-soluble resin having an amide group and / or an imide group has high solubility, and thus has been suitably used as an organic solvent for these resins.
- the organic solvent having a nitrogen atom remains in the insulating layer after curing, even when thermally cured at a temperature higher than the boiling point of the solvent. And it discovered that this trace amount residual solvent reduced the drive performance of a thin-film transistor. Therefore, in this invention, it is essential that content of the organic solvent which has a nitrogen atom is 1 mass% or less with respect to the organic solvent whole quantity.
- the content of the organic solvent having a nitrogen atom is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and 1% by mass or less, based on the total amount of the organic solvent. Is preferably 0.5% by mass or less, more preferably 0.3% by mass or less.
- the term “foreign matter” as used herein refers to organic fine particles generated by aggregation and insolubilization of a part of a photosensitive resin composition component dissolved in an organic solvent, in particular, (A) an alkali-soluble resin having an amide group and / or an imide group. Refers to that.
- the organic solvent having a nitrogen atom has a very high affinity with (A) the amide group and / or imide group contained in the resin skeleton of the alkali-soluble resin having an amide group and / or an imide group.
- organic solvents having nitrogen atoms particularly excellent solvents for suppressing the precipitation of foreign substances are N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N, N-dimethylformamide, N, N— Examples thereof include diethylformamide, N, N-dimethylacetamide, N, N-diethylacetamide, 1,3-dimethyl-2-imidazolidinone, and N, N-dimethylisobutyramide.
- content of the organic solvent which satisfies following (1) and (2) in the said (C) organic solvent is 80 mass% or more with respect to the organic solvent whole quantity.
- Solubility parameter is 8.0 or more and 11.0 or less [unit is (cal / cm 3 ) 1/2 ]
- Organic compound composed of carbon atom, hydrogen atom, and oxygen atom is described. To do.
- the solubility parameter here is used as an indicator of the compatibility and affinity of a plurality of substances, and is defined by the following formula (Formula 1).
- ⁇ E V [10 6 N ⁇ m ⁇ mol ⁇ 1 ] is the heat of evaporation
- V 0 [m 3 ⁇ mol ⁇ 1 ] is the volume per mol.
- the value of the solubility parameter is smaller as the polarity is lower, and larger as the polarity is higher, for example, n-hexane (7.3), ethanol (12.7), and water (23.4).
- the difference in solubility parameter between two substances is closely related to the energy required for the two substances to be compatible. The smaller the difference in solubility parameter, the less energy is required for the two substances to be compatible. It will be small. That is, when two substances are present, in general, the smaller the difference in solubility parameter, the higher the affinity and the higher the compatibility.
- the solubility parameter can be obtained by experiments, but can also be obtained by calculation.
- Examples of the method for obtaining the solubility parameter by calculation include a method proposed by Fedors et al. (POLYMER ENGINEERING AND SCIENCE, FEBRUARY, 1974, Vol. 14, No. 2, ROBERT F. FEDORS.).
- POLYMER HANDBOOK FORTH EDITION WILEY-INTERSCIENCE describes solubility parameter data of various organic solvents.
- the preferred solubility parameter range is 8.0 or more, more preferably 8.4 or more, 11.0 or less, and more preferably 10.6 or less.
- (A) the alkali-soluble resin having an amide group and / or imide group can be sufficiently dissolved, and by selecting an organic solvent satisfying the second requirement of 11.0 or less, photosensitivity can be obtained.
- the organic solvent is easily removed in the step of thermosetting the functional resin, the organic solvent remaining in the insulating layer after curing can be sufficiently reduced, and excellent driving performance can be easily exhibited. The reason for this will be further described below.
- the alkali-soluble resin (A) having an amide group and / or an imide group used in the present invention includes an amide group and / or an imide group in the skeleton, a carboxyl group for imparting alkali solubility, a phenolic hydroxyl group, and a sulfonic acid. Since it contains many polar groups such as groups and thiol groups, it is a highly polar resin and its solubility parameter is high.
- the solubility parameter is generally in the range of 12.0 to 16.0.
- a highly polar solvent having a high affinity with the resin, that is, having a close solubility parameter is excellent in terms of solubility, but it is difficult to remove the organic solvent in the step of thermosetting the photosensitive resin due to its high affinity.
- the solubility parameter of the organic solvent preferably used in the present invention is 11.0 or less, and one that is different from the solubility parameter of the resin is selected.
- the affinity between the organic solvent and the resin is relatively low, but the low affinity makes it easier for the organic solvent to be removed in the process of thermally curing the photosensitive resin, and the insulating layer after curing. It is possible to sufficiently reduce the remaining organic solvent. Accordingly, a thin film transistor with less outgas generated from the insulating layer and excellent driving performance can be obtained more easily.
- the organic solvent is (2) an organic compound composed of carbon atoms, hydrogen atoms, and oxygen atoms
- the organic solvent has an oxygen atom in the molecular structure, and the solvating ability derived from the lone pair of the oxygen atom has (A) an alkali-soluble resin having an amide group and / or an imide group.
- the solubility of can be increased moderately.
- examples of the organic solvent having a nitrogen atom in the molecular structure include those having a functional group such as an amide group, a urethane group, and a urea group. These functional groups are amide groups or imides contained in the resin skeleton.
- the organic solvent is preferably an organic compound composed of carbon atoms, hydrogen atoms, and oxygen atoms. Examples of such chemical structures include ether groups, alcohol groups, ester groups, and ketone groups.
- Examples of the organic solvent satisfying the above (1) and (2) include ethylene glycol mono-n-butyl ether (9.5, 171 ° C.), diethylene glycol monomethyl ether (10.7, 194 ° C.), diethylene glycol monoethyl ether.
- the content of the organic solvent satisfying the above (1) and (2) is preferably 80% by mass or more, more preferably 90% by mass or more, and still more preferably based on the total amount of the organic solvent. It is 99 mass% or more. By setting it as 80 mass% or more, the organic solvent which remains in the insulating layer after hardening can fully be reduced.
- the organic solvent (C) used in the present invention can be used in combination with an organic solvent other than the organic solvent satisfying the above (1) and (2) according to the purpose.
- the (C) organic solvent satisfying the above (1) and (2) further satisfies the following (3).
- (3) By selecting an organic solvent having a boiling point at atmospheric pressure of 100 ° C. or higher and 180 ° C. or lower at atmospheric pressure, poor coating due to too high solvent volatility can be prevented.
- an organic solvent having a temperature of 0 ° C. or lower By selecting an organic solvent having a temperature of 0 ° C. or lower, the organic solvent remaining in the insulating layer after curing can be further reduced.
- the content of the organic solvent (C) used in the present invention is preferably 100 to 2,000 parts by mass with respect to 100 parts by mass of (A) the alkali-soluble resin having an amide group and / or an imide group.
- the organic solvent (C) used in the present invention is not only an organic solvent intentionally added for dissolving the resin composition, but also an organic solvent contained as an impurity in the photosensitive resin composition for thin film transistors. Is also included.
- the photosensitive resin composition for a thin film transistor of the present invention can contain a thermal crosslinking agent.
- the thermal crosslinking agent refers to a compound having in the molecule at least two thermally reactive functional groups such as an alkoxymethyl group, a methylol group, an epoxy group, and an oxetanyl group.
- the thermal crosslinking agent can crosslink (A) an alkali-soluble resin having an amide group and / or an imide group, or other additive components, and can increase the heat resistance, chemical resistance and hardness of the film after thermosetting.
- Preferred examples of the compound having at least two alkoxymethyl groups or methylol groups include, for example, DML-PC, DML-PEP, DML-OC, DML-OEP, DML-34X, DML-PTBP, DML-PCHP, DML- OCHP, DML-PFP, DML-PSBP, DML-POP, DML-MBOC, DML-MBPC, DML-MTrisPC, DML-BisOC-Z, DML-BisOCHP-Z, DML-BPC, DML-BisOC-P, DMOM- PC, DMOM-PTBP, DMOM-MBPC, TriML-P, TriML-35XL, TML-HQ, TML-BP, TML-pp-BPF, TML-BPE, TML-BPA, TML-BPAF, TML-BPAP, TMOM- BP, TMOM- PE, TMOM-BPA, TMOM-BPAF, TMOM-BPAP, H
- Preferred examples of the compound having at least two epoxy groups include, for example, Epolite 40E, Epolite 100E, Epolite 200E, Epolite 400E, Epolite 70P, Epolite 200P, Epolite 400P, Epolite 1500NP, Epolite 80MF, Epolite 4000, Epolite 3002 (or more , Manufactured by Kyoeisha Chemical Co., Ltd.), Denacol (registered trademark) EX-212L, Denacol EX-214L, Denacol EX-216L, Denacol EX-321L, Denacol EX-850L (above, manufactured by Nagase ChemteX Corporation), Epicort 828, Epicoat 1002, Epicoat 1750, Epicoat 1007, YX8100-BH30, E1256, E4250, E4275 (above, Japan Epoxy Resin ( ), Epicron (registered trademark) EXA-9583, HP4032, HP
- the compound having at least two oxetanyl groups include, for example, etanacol (registered trademark) EHO, etanacol OXBP, etanacol OXTP, etanacol OXMA (above, manufactured by Ube Industries, Ltd.), oxetaneated phenol novolak, and the like. .
- Two or more thermal crosslinking agents may be used in combination.
- the content of the thermal crosslinking agent is preferably 0.1 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of (A) the alkali-soluble resin having an amide group and / or an imide group. If the content of the thermal crosslinking agent is 0.1 parts by mass or more and 30 parts by mass or less, it becomes easy to increase the chemical resistance and hardness of the film after baking or curing, and the storage stability of the photosensitive resin composition for thin film transistors. It will be easier to improve.
- the photosensitive resin composition for a thin film transistor of the present invention preferably further contains (D) an adhesion improver.
- Adhesion improvers include vinyltrimethoxysilane, vinyltriethoxysilane, epoxycyclohexylethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, p-styryltri Silane coupling agents such as methoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, titanium chelating agents, aluminum chelating agents, aromatic amine compounds Examples thereof include compounds obtained by reacting an alkoxy group-containing silicon compound.
- adhesion improving agent By containing an adhesion improving agent, adhesion to an underlying substrate such as a silicon wafer, ITO, SiO 2 or silicon nitride can be improved when developing a photosensitive resin film. Further, resistance to oxygen plasma and UV ozone treatment used for cleaning or the like can be increased. Further, the driving performance of the thin film transistor can be further improved. Although it is not clear about the mechanism, the adhesion of the base substrate is increased by containing an adhesion improver, and it is difficult for the thin film transistor to peel off even under severe conditions such as high temperature and high humidity. It is presumed that the driving performance is further improved.
- the (D) adhesion improving agent preferably contains a silane coupling agent having a nitrogen atom. This is because the silane coupling agent having a nitrogen atom has high affinity with (A) an alkali-soluble resin having an amide group and / or an imide group, and the adhesion improving effect is particularly high.
- silane coupling agent having a nitrogen atom examples include 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysilyl-N- (1,3-dimethylbutylidene) propylamine, N-phenyl -3-aminopropyltrimethoxysilane, 3-ureidopropyltriethoxysilane, 3- (2-aminoethyl) aminopropyltrimethoxysilane, 3- (2-aminoethyl) aminopropylmethyldimethoxysilane, etc. .
- the content of the adhesion improving agent is preferably 0.1 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of (A) an alkali-soluble resin having an amide group and / or an imide group.
- the photosensitive resin composition for a thin film transistor of the present invention may contain a surfactant for the purpose of improving the wettability with the substrate or improving the film thickness uniformity of the coating film, if necessary.
- a surfactant for the purpose of improving the wettability with the substrate or improving the film thickness uniformity of the coating film, if necessary.
- commercially available compounds can be used.
- silicone-based surfactant SH series, SD series, ST series of Toray Dow Corning Silicone, BYK series of Big Chemie Japan, Shin-Etsu Silicone The KP series from Nippon Oil & Fats, the TSF series from TOSHIBA Silicone Co., Ltd., etc. are included.
- fluorosurfactants the “MegaFac (registered trademark)” series from Dainippon Ink Industries, Ltd., Sumitomo 3M Asahi Glass's “Surflon (registered trademark)” series, “Asahi Guard (registered trademark)” series, Shin-Akita Kasei's EF series, Omninova Solution's Polyfox series, etc. And / or methacrylic polymers
- the surfactant Kyoeisha Chemical Co. Poly flow series, manufactured by Kusumoto Chemicals, Inc. "DISPARLON (registered trademark)” series, and the like, but each available from companies, but are not limited to.
- the content of the surfactant is preferably 0.001 part by mass or more and 1 part by mass or less with respect to 100 parts by mass of (A) the alkali-soluble resin having an amide group and / or an imide group.
- the photosensitive resin composition for a thin film transistor of the present invention may contain a compound having a phenolic hydroxyl group for the purpose of supplementing the alkali developability of the photosensitive resin composition for a thin film transistor, if necessary.
- the compound having a phenolic hydroxyl group include Bis-Z, BisOC-Z, BisOPP-Z, BisP-CP, Bis26X-Z, BisOTBP-Z, BisOCHP-Z, BisOCR-CP, BisP-MZ, BisP-EZ.
- the obtained photosensitive resin composition for a thin film transistor hardly dissolves in an alkali developer before exposure, and easily dissolves in an alkali developer upon exposure. There is little film loss due to development, and development is easy in a short time. Therefore, the sensitivity is easily improved.
- the content of such a compound having a phenolic hydroxyl group is preferably 1 part by mass or more and 20 parts by mass or less with respect to 100 parts by mass of (A) an alkali-soluble resin having an amide group and / or an imide group.
- the photosensitive resin composition for a thin film transistor of the present invention may contain inorganic particles for the purpose of improving the relative dielectric constant of the cured film, improving the hardness, and reducing the thermal expansion coefficient.
- inorganic particles for the purpose of improving the relative dielectric constant of the cured film, improving the hardness, and reducing the thermal expansion coefficient.
- Preferable specific examples include silicon oxide, titanium oxide, barium titanate, barium sulfate, barium oxide, zirconium oxide, hafnium oxide, tantalum oxide, tungsten oxide, yttrium oxide, alumina, talc and the like.
- the primary particle diameter of these inorganic particles is preferably 100 nm or less, more preferably 60 nm or less.
- the content of the inorganic particles is preferably 5 parts by mass or more and 500 parts by mass or less with respect to 100 parts by mass of the alkali-soluble resin (A) having an amide group and / or an imide group.
- the photosensitive resin composition for a thin film transistor of the present invention may contain a thermal acid generator.
- the thermal acid generator generates an acid by heating and promotes the crosslinking reaction of the thermal crosslinker.
- the thermal decomposition starting temperature of the thermal acid generator used in the present invention is preferably 50 ° C. to 270 ° C., more preferably 250 ° C. or less. Further, when the photosensitive resin composition for a thin film transistor of the present invention is applied to a substrate and dried (pre-bake: about 70 to 140 ° C.), no acid is generated, and the final heating (cure) after patterning by subsequent exposure and development. : About 100 to 400 ° C.) is preferable because it can suppress a decrease in sensitivity during development.
- the acid generated from the thermal acid generator used in the present invention is preferably a strong acid.
- a strong acid for example, p-toluenesulfonic acid, arylsulfonic acid such as benzenesulfonic acid, methanesulfonic acid, ethanesulfonic acid, propanesulfonic acid, butanesulfonic acid
- Alkyl sulfonic acids such as haloalkyl sulfonic acids such as trifluoromethyl sulfonic acid are preferred.
- salts such as onium salts or as covalently bonded compounds such as imidosulfonates. Two or more of these may be contained.
- the content of the thermal acid generator used in the present invention is preferably 0.01 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of (A) the alkali-soluble resin having an amide group and / or an imide group.
- a method for producing the photosensitive resin composition for a thin film transistor of the present invention will be described.
- a thin film transistor is obtained by dissolving the components (A) to (C) and, if necessary, a thermal crosslinking agent, an adhesion improver, a surfactant, a compound having a phenolic hydroxyl group, inorganic particles, a thermal acid generator, and the like.
- Photosensitive resin composition can be obtained.
- the dissolution method include stirring and heating. In the case of heating, the heating temperature is preferably set in a range that does not impair the performance of the photosensitive resin composition for thin film transistors, and is usually room temperature to 80 ° C.
- each component is not particularly limited, and for example, there is a method of sequentially dissolving compounds having low solubility.
- components that tend to generate bubbles when stirring and dissolving such as surfactants and some adhesion improvers, by dissolving other components and adding them last, poor dissolution of other components due to the generation of bubbles Can be prevented.
- the obtained photosensitive resin composition for a thin film transistor is preferably filtered using a filtration filter to remove dust and particles.
- a filtration filter to remove dust and particles.
- the filter pore diameter include, but are not limited to, 0.5 ⁇ m, 0.2 ⁇ m, 0.1 ⁇ m, 0.07 ⁇ m, 0.05 ⁇ m, and 0.02 ⁇ m.
- the material for the filter include polypropylene (PP), polyethylene (PE), nylon (NY), polytetrafluoroethylene (PTFE), and polyethylene and nylon are preferable.
- the cured film of the present invention is formed by curing the photosensitive resin composition for thin film transistors of the present invention.
- the manufacturing method of the cured film of this invention is demonstrated in detail.
- the method for producing a cured film of the present invention includes a step of applying the photosensitive resin composition for a thin film transistor of the present invention to form a photosensitive resin film, a step of drying the photosensitive resin film, and exposing the photosensitive resin film.
- the film between the application of the photosensitive resin composition for a thin film transistor on the substrate and before the heat curing is referred to as the photosensitive resin film, and the heat curing.
- the latter film is called a cured film.
- the photosensitive resin film from the application of the photosensitive resin composition for thin film transistors to the period before drying may be referred to as a coating film.
- the photosensitive resin composition for a thin film transistor of the present invention is applied by a spin coating method, a slit coating method, a dip coating method, a spray coating method, a printing method, or the like to obtain a coating film of the photosensitive resin composition for a thin film transistor.
- the slit coat method is preferably used.
- the slit coating method can be applied with a small amount of coating liquid, and is advantageous for cost reduction.
- the amount of coating solution required for the slit coating method is, for example, about 1/5 to 1/10 as compared with the spin coating method.
- the coating speed is generally in the range of 10 mm / second to 400 mm / second.
- the thickness of the coating film varies depending on the solid content concentration, viscosity, etc. of the photosensitive resin composition for thin film transistors. Usually, the thickness after drying is 0.1 to 10 ⁇ m, preferably 0.3 to 5 ⁇ m. Applied.
- the substrate on which the photosensitive resin composition for thin film transistors is coated may be pretreated with the above-described adhesion improving agent in advance.
- a solution in which 0.5 to 20% by mass of an adhesion improver is dissolved in a solvent such as isopropanol, ethanol, methanol, water, tetrahydrofuran, propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether, ethyl lactate, diethyl adipate, or the like is used.
- a method of treating the substrate surface examples include spin coating, slit die coating, bar coating, dip coating, spray coating, and steam treatment.
- the coating film that is, the photosensitive resin film
- the coating film is dried. Drying in this step represents vacuum drying or heat drying. Both vacuum drying and heat drying may be performed, or only one of them may be performed.
- vacuum drying for example, a substrate on which a coating film is formed is placed on proxy pins arranged in a vacuum chamber, and the coating film is dried by reducing the pressure in the vacuum chamber. At this time, if the distance between the substrate and the vacuum chamber top plate is large, the air located between the substrate and the vacuum chamber top plate flows in a large amount along with the reduced pressure drying, and it becomes easy to generate moire. Therefore, it is preferable to adjust the proxy pin height so as to narrow the interval.
- the distance between the substrate and the vacuum chamber top is preferably about 2 to 20 mm, more preferably 2 to 10 mm.
- the vacuum drying speed depends on the vacuum chamber volume, the vacuum pump capacity, the pipe diameter between the chamber and the pump, etc., for example, under conditions where the pressure in the vacuum chamber is reduced to 40 Pa after 60 seconds in the absence of a coating substrate. Set and used.
- the general vacuum drying time is often about 30 to 100 seconds, and the ultimate pressure in the vacuum chamber at the end of the vacuum drying is usually 100 Pa or less with the coated substrate. By setting the ultimate pressure to 100 Pa or less, the coating film surface can be brought into a dry state without stickiness, whereby surface contamination and generation of particles can be suppressed in subsequent substrate transport.
- This process is also called pre-baking. Drying uses a hot plate, oven, infrared rays and the like.
- a hot plate When a hot plate is used, the coating film is heated directly on the plate or on a jig such as a proxy pin installed on the plate.
- the material of the proxy pin there is a metal material such as aluminum or stainless steel, or a synthetic resin such as polyimide resin or “Teflon (registered trademark)”. Any material can be used as long as it has heat resistance. .
- the height of the proxy pin varies depending on the size of the substrate, the type of coating film, the purpose of heating, etc., but is preferably about 0.1 to 10 mm.
- the heating temperature varies depending on the type and purpose of the coating film, and it is preferably performed in the range of 50 to 180 ° C. for 1 minute to several hours.
- the process of exposing the photosensitive resin film will be described.
- exposure is performed by irradiating actinic radiation through a mask having a desired pattern on the photosensitive resin film.
- actinic radiation there are ultraviolet rays, visible rays, electron beams, X-rays and the like.
- the exposed portion is dissolved in the developer.
- the exposed area is cured and insolubilized in the developer.
- a process for developing the exposed photosensitive resin film will be described.
- a desired pattern is formed by removing an exposed portion in the case of a positive type and a non-exposed portion in the case of a negative type using a developer.
- An aqueous solution of an alkaline compound such as dimethylaminoethyl, dimethylaminoethanol, dimethylaminoethyl methacrylate, cyclohexylamine, ethylenediamine, hexamethylenediamine and the like is preferable.
- these alkaline aqueous solutions may contain polar solvents such as N-methyl-2-pyrrolidone, N, N-dimethylformamide, N, N-dimethylacetamide, dimethyl sulfoxide, ⁇ -butyrolactone, dimethylacrylamide, methanol, ethanol, Alcohols such as isopropanol, esters such as ethyl lactate and propylene glycol monomethyl ether acetate, ketones such as cyclopentanone, cyclohexanone, isobutyl ketone, and methyl isobutyl ketone may be added singly or in combination. Good. As a developing method, methods such as spraying, paddle, dipping, and ultrasonic waves are possible.
- polar solvents such as N-methyl-2-pyrrolidone, N, N-dimethylformamide, N, N-dimethylacetamide, dimethyl sulfoxide, ⁇ -butyrolactone, dimethylacrylamide, methanol
- alcohols such as ethanol and isopropyl alcohol
- esters such as ethyl lactate and propylene glycol monomethyl ether acetate may be added to distilled water for rinsing treatment.
- the photosensitive resin composition for a thin film transistor of the present invention contains a polyimide precursor, an alkali-soluble resin selected from a polybenzoxazole precursor, a copolymer thereof, or a copolymer of these and a polyimide.
- an imide ring and an oxazole ring can be formed by heat curing, heat resistance and chemical resistance can be improved, and a compound having at least two alkoxymethyl groups, methylol groups, epoxy groups, or oxytanyl groups is included.
- the thermal crosslinking reaction can be advanced by heat curing, and the heat resistance and chemical resistance can be improved.
- This heat curing is carried out for 5 minutes to 5 hours by selecting the temperature and raising the temperature stepwise, or selecting a certain temperature range and continuously raising the temperature.
- a method of performing heat treatment at 150 ° C., 250 ° C., and 400 ° C. for 30 minutes each, or linearly raising the temperature from room temperature to 400 ° C. over 2 hours may be mentioned.
- the heat curing conditions in the present invention are preferably 300 ° C. or higher, more preferably 350 ° C. or higher, and further preferably 360 ° C. or higher in terms of reducing the amount of outgas generated from the cured film.
- 500 degrees C or less is preferable at the point which gives sufficient film toughness to a cured film, and 450 degrees C or less is more preferable.
- the cured film obtained by the above-described method is used as at least one of the gate insulating layer and the interlayer insulating layer of the thin film transistor.
- the amount of organic solvent components generated is preferably 1 ppm or less, more preferably 0.5 ppm or less, and even more preferably. Is 0.2 ppm or less.
- the total amount of outgas components generated is preferably 5 ppm or less, more preferably 4 ppm or less, and even more preferably 3 ppm or less.
- the type and amount of gas components used are, for example, the purge and trap / GC-MS method, which is adsorbed and trapped by the purge and trap method and detected by gas chromatography mass spectrometry (GC-MS). Can be measured.
- the insulating layer is exposed by disassembling and polishing the thin film transistor, the necessary amount of the insulating layer is sampled, heated at 180 ° C. for 30 minutes, and adsorbed and trapped by the purge and trap method.
- the analyzed components are analyzed using GC-MS, and a calibration curve is created using n-hexadecane as a standard substance, and the types and generation amounts of gas components can be obtained.
- the thin film transistor of the present invention has the cured film of the present invention on at least one of a gate insulating layer and an interlayer insulating layer.
- the thin film transistor of the present invention will be described with reference to the drawings.
- FIG. 1 is a cross-sectional view showing an example of a thin film transistor of the present invention, and has a top gate type structure.
- a thin film transistor of the present invention illustrated in FIG. 1 includes a buffer layer 2 on a substrate 1, a semiconductor layer 5 having a source region 3 and a drain region 4 formed on the buffer layer 2, a gate insulating layer 6, and a gate insulating layer.
- a gate electrode 7 and an interlayer insulating layer 8 formed on the layer 6, and a source electrode 9 and a drain electrode 10 formed so as to be electrically connected to the semiconductor layer 5 are provided.
- FIG. 2 is a cross-sectional view showing another example of the thin film transistor of the present invention, which has a bottom gate type structure.
- a thin film transistor of the present invention illustrated in FIG. 2 includes a buffer layer 2 on a substrate 1, a gate electrode 7 formed on the buffer layer 2, a gate insulating layer 6, and a source region formed on the gate insulating layer 6. 3, a semiconductor layer 5 having a drain region 4, an interlayer insulating layer 8, and a source electrode 9 and a drain electrode 10 formed so as to be electrically connected to the semiconductor layer 5.
- At least one of the gate insulating layer 6 and the interlayer insulating layer 8 in FIG. 1 and at least one of the gate insulating layer 6 and the interlayer insulating layer 8 in FIG. 2 are the cured films of the present invention. .
- the thin film transistor of the present invention by using the cured film of the present invention for at least one of the gate insulating layer and the interlayer insulating layer, a high-temperature or high-vacuum environment can be used in other manufacturing processes of the thin film transistor and subsequent manufacturing processes of the display device. Even in this case, outgas generated from the insulating layer can be sufficiently reduced. By suppressing outgas, it is possible to prevent impurities from being mixed into the semiconductor layer and to provide excellent TFT driving characteristics.
- the gate insulating layer and the interlayer insulating layer is formed by using the photosensitive resin composition for a thin film transistor of the present invention, so that the expensive vacuum deposition required when forming the conventional inorganic insulating layer. Equipment is not required and costs can be reduced.
- the insulating layer can be patterned by applying, exposing and developing a photosensitive resin composition for a thin film transistor, and can be easily processed without requiring a resist material. Furthermore, since the film toughness is higher than that of the inorganic film, the occurrence of cracks can be suppressed even when a flexible substrate is used.
- the thin film transistor of the present invention has the cured film of the present invention in an interlayer insulating layer, such as a flexible display using a plastic substrate, and the requirement for TFT driving characteristics is particularly severe, and includes silicon nitride, silicon oxide, acid
- a top gate type in which at least one of silicon nitride is included in the gate insulating layer is preferable.
- the interlayer insulating layer is not in contact with the semiconductor layer, and the gate insulating layer is in contact with the semiconductor layer. Therefore, high TFT driving characteristics can be easily obtained by using an inorganic film for the gate insulating layer.
- the interlayer insulating layer is generally formed thicker than the gate insulating layer.
- the interlayer insulating layer is generally formed thicker than the gate insulating layer.
- the substrate used for the thin film transistor of the present invention is not particularly limited as long as the thin film transistor can be formed on the substrate.
- the substrate include glass, quartz, silicon, ceramic, and plastic.
- plastics include polyimide, polyethylene terephthalate, polybutylene terephthalate, polyethersulfone, and polyethylene naphthalate.
- the buffer layer used in the thin film transistor of the present invention serves to flatten the surface while preventing impurities from penetrating from the substrate, and is not particularly limited as long as it exhibits this effect.
- Examples of the buffer layer include silicon nitride (SiN x ), silicon oxide (SiO x ), and silicon oxynitride (SiO x N y ).
- the buffer layer is not always necessary and can be omitted.
- the semiconductor layer used in the thin film transistor of the present invention is not particularly limited as long as the thin film transistor can be formed on the substrate, and examples thereof include polysilicon, amorphous silicon, oxide semiconductor, and organic semiconductor.
- oxide semiconductors include zinc oxide (ZnO), nickel oxide (NiO), tin oxide (SnO 2 ), titanium oxide (TiO 2 ), vanadium oxide (VO 2 ), indium oxide (In 2 O 3 ), Examples include strontium titanate (SrTiO 3 ), InGaZnO, InAlZnO, InSiZnO, InNiZnO, InCuZnO, InHfZnO, and InZnO.
- organic semiconductor examples include polythiophene, polyacetylene, polyfluorene, polyphenylene vinylene, polypyrrole, polyaniline, tetracene, pentacene, oligothiophene, perylene, heteroacene, phthalocyanine, and phenylene.
- the gate insulating layer and the interlayer insulating layer is formed using the photosensitive resin composition for a thin film transistor of the present invention. Therefore, when using the photosensitive resin composition for thin film transistors of the present invention for the interlayer insulating layer, other materials may be used for the gate insulating layer. Moreover, when using the photosensitive resin composition for thin film transistors of this invention for a gate insulating layer, you may use another material for an interlayer insulation layer. Other materials used for the gate insulating layer or the interlayer insulating layer are not particularly limited as long as they can provide necessary insulating characteristics. For example, silicon nitride (SiN x ), silicon oxide (SiO x ), silicon oxynitride (SiO x N y ) and the like.
- the gate electrode, source electrode, and drain electrode used in the thin film transistor of the present invention are not particularly limited as long as they can provide necessary conductive performance.
- Cr, Mo, Al, Cu, Ag, Au, Ti, Ta Nb, W, Fe, Ni, Co, Rh, Nd, Pb, and the like, and alloys or silicides containing these metals can be used.
- a conductive material such as ITO or IZO can be used.
- the method for producing a thin film transistor of the present invention includes the method for producing a cured film of the present invention.
- a general method can be used as a method for manufacturing a thin film transistor using the cured film as at least one of a gate insulating layer and an interlayer insulating layer, and is not particularly limited.
- the thin film transistor of the present invention is not particularly limited as to the type of substrate, but is preferably fabricated on a flexible substrate where the insulating layer is required to have crack resistance.
- the thin film transistor of the present invention can be suitably used as a liquid crystal display device or an organic electroluminescence display device (organic EL display device). In particular, it can be suitably used as a flexible display device manufactured using a flexible substrate. In addition to the display device, the thin film transistor of the present invention can also be applied to an IC card or an ID tag manufactured using a flexible substrate.
- the liquid crystal display device or organic light emitting display device of the present invention includes the thin film transistor of the present invention.
- the manufacturing method of the liquid crystal display device or organic electroluminescence display device of the present invention uses the thin film transistor obtained by the manufacturing method of the thin film transistor of the present invention.
- a method for producing a liquid crystal display device using a thin film transistor obtained by the method for producing a thin film transistor of the present invention for example, a known method described in JP-A-2014-157204 can be used.
- a method for producing an organic electroluminescence display device using a thin film transistor obtained by the method for producing a thin film transistor of the present invention a known method described in, for example, JP-A-2008-40324 can be used.
- the photosensitive resin composition for thin film transistors, the cured film, and the thin film transistor in the examples were evaluated by the following methods.
- (1) Analysis of outgas from cured film A varnish suitable for each reference example was applied on an 8-inch silicon wafer by spin coating, and prebaked on a hot plate at 120 ° C. for 2 minutes. 2. Developed with 38% TMAH aqueous solution for 60 seconds and rinsed with pure water. Thereafter, the film was cured in an oven at 380 ° C. for 60 minutes under a nitrogen atmosphere to obtain a cured film having a thickness of 1.0 ⁇ m.
- the collected components were thermally desorbed at 280 ° C. for 5 minutes, and then column: DB-5 (manufactured by Agilent, inner diameter: 0.25 mm, length) using a GC-MS apparatus 6890 / 5973N (manufactured by Agilent). : 30 m, film thickness: 1.0 ⁇ m), column temperature: 40 to 300 ° C. (heating rate: 8 ° C./min), carrier gas: helium (1.5 mL / min), scan range: m / z 29 to 600 Under conditions, GC-MS analysis was performed. A calibration curve was prepared by GC-MS analysis under the same conditions as above using n-hexadecane as a standard substance, and the amount of gas generated was calculated in terms of n-hexadecane.
- the thin film transistor used in this example is shown in FIG.
- An aluminum film was formed on a glass substrate 11 having a thickness of 0.7 mm so as to have a thickness of 100 nm by magnetron DC sputtering.
- a positive resist solution After applying a positive resist solution, it was dried on a hot plate at 90 ° C. to form a resist film.
- aluminum was selectively removed only in a region having no resist pattern using a phosphoric acid etching solution.
- the gate electrode 12 was formed.
- the photosensitive resin composition for thin film transistors according to each reference example was spin-coated and dried on a hot plate at 100 ° C. to prepare a prebaked film having a thickness of 1000 nm.
- the obtained pre-baked film was developed with a 2.38% TMAH aqueous solution and then rinsed with water.
- it was cured in an oven at 380 ° C. for 60 minutes under a nitrogen atmosphere. In this manner, a cured film having a thickness of 500 nm was obtained and used as the gate insulating layer 13.
- an a-Si layer (amorphous silicon layer) having a thickness of 250 nm to be the semiconductor layer 14 and an n + Si layer having a thickness of 50 nm to be the impurity-added semiconductor layer 15 were sequentially formed by a CVD method (Chemical Vapor Deposition).
- a CVD method Chemical Vapor Deposition
- it was dried on a hot plate at 90 ° C. to form a resist film.
- the resist film was patterned by exposure and development, and then the impurity-added semiconductor layer and the semiconductor layer were selectively removed by dry etching only in a region having no resist pattern.
- an aluminum film was formed to a thickness of 100 nm by magnetron DC sputtering.
- a positive resist solution After applying a positive resist solution, it was dried on a hot plate at 90 ° C. to form a resist film.
- aluminum was selectively removed only in a region having no resist pattern using a phosphoric acid etching solution. Thereafter, only the region having no resist pattern was selectively removed by dry etching using sulfur hexafluoride gas.
- a photosensitive resin composition for a thin film transistor according to each reference example was spin-coated and dried on a hot plate at 100 ° C. to prepare a pre-baked film having a thickness of 1800 nm.
- the resulting prebaked film was exposed by placing a photomask, developed with a 2.38% TMAH aqueous solution, and then rinsed with water.
- it was cured in an oven at 380 ° C. for 60 minutes under a nitrogen atmosphere. In this way, an interlayer insulating layer 18 having a thickness of 1000 nm was obtained in such a manner that a part of the source electrode 16 and the drain electrode 17 was exposed.
- the drain current was measured when the gate voltage was swept in the range of ⁇ 20V to 20V, and the threshold voltage Vth was calculated. .
- the substrate after measurement was placed on a hot plate heated to 80 ° C. for 100 hours, and then the threshold voltage Vth was calculated in the same manner as described above. The difference in threshold voltage before and after the high temperature degradation test was calculated, and this absolute value was taken as ⁇ Vth.
- Synthesis Example 1 Synthesis of hydroxyl group-containing diamine compound 18.3 g (0.05 mol) of 2,2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane (hereinafter referred to as BAHF) was added to 100 mL of acetone and propylene oxide 17 .4 g (0.3 mol) was dissolved and cooled to -15 ° C. A solution prepared by dissolving 20.4 g (0.11 mol) of 3-nitrobenzoyl chloride in 100 mL of acetone was added dropwise thereto. After completion of the dropwise addition, the mixture was reacted at ⁇ 15 ° C. for 4 hours and then returned to room temperature. The precipitated white solid was filtered off and vacuum dried at 50 ° C.
- BAHF 2,2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane
- Synthesis Example 3 Synthesis of alkali-soluble resin (A-2) 31.0 g (0.10 mol) of ODPA was dissolved in 500 g of NMP under a dry nitrogen stream.
- A-2 alkali-soluble resin
- 45.35 g (0.075 mol) of the hydroxyl group-containing diamine compound obtained in Synthesis Example 1 and 1.24 g (0.005 mol) of 1,3-bis (3-aminopropyl) tetramethyldisiloxane were mixed with 50 g of NMP. And reacted at 20 ° C. for 1 hour and then at 50 ° C. for 2 hours.
- Synthesis Example 4 Synthesis of Alkali-Soluble Resin (A-3) Under a dry nitrogen stream, 18.3 g (0.05 mol) of BAHF was dissolved in 50 g of NMP and 26.4 g (0.3 mol) of glycidyl methyl ether, and the temperature of the solution was adjusted. Cooled to -15 ° C. 7.4 g (0.025 mol) of diphenyl ether dicarboxylic acid dichloride (manufactured by Nippon Agricultural Chemicals Co., Ltd.) and 5.1 g (0.025 mol) of isophthalic acid chloride (manufactured by Tokyo Chemical Industry Co., Ltd.) were added to ⁇ -butyrolactone (GBL).
- GBL ⁇ -butyrolactone
- Synthesis Example 5 Synthesis of quinonediazide compound (B-1)
- TrisP-PA trade name, manufactured by Honshu Chemical Industry Co., Ltd.
- 21.22 g 0.05 mol
- 5-naphthoquinonediazidesulfonyl acid chloride 36 .27 g (0.135 mol) was dissolved in 450 g of 1,4-dioxane and brought to room temperature.
- 15.18 g of triethylamine mixed with 50 g of 1,4-dioxane was added dropwise so that the temperature inside the system would not exceed 35 ° C. It stirred at 30 degreeC after dripping for 2 hours.
- Synthesis Example 6 Synthesis of quinonediazide compound (B-2) 21.22 g (0.05 mol) of TrisP-PA (trade name, manufactured by Honshu Chemical Industry Co., Ltd.) and 4-naphthoquinonediazidesulfonyl acid chloride 36 in a dry nitrogen stream .27 g (0.135 mol) was dissolved in 450 g of 1,4-dioxane and brought to room temperature. To this, 15.18 g of triethylamine mixed with 50 g of 1,4-dioxane was added dropwise so that the temperature inside the system would not exceed 35 ° C. It stirred at 30 degreeC after dripping for 2 hours.
- TrisP-PA trade name, manufactured by Honshu Chemical Industry Co., Ltd.
- Production Examples 2 to 19 In the same manner as in Production Example 1, the types and amounts of the compounds were as shown in Table 1, and varnishes B to S were obtained. Table 2 shows the presence or absence of nitrogen atoms and oxygen atoms in the molecular structure, solubility parameters, and boiling points at atmospheric pressure for the organic solvents used in the production examples.
- the cured films of Examples 1 to 15 have a total outgas component generation amount of 7 ppm or less and an organic solvent component generation amount of 3 ppm or less, whereas the cured films of Comparative Examples 1 to 4 have a total outgas component generation amount of organic solvent. It can be seen that the amount of components generated is large. In particular, in the cured films of Examples 1 to 4 and 6 to 15, the total amount of outgas components generated was 5 ppm or less, and the amount of organic solvent components generated was 1 ppm or less. In addition, the thin film transistors of Examples 1 to 15 had a small ⁇ Vth, which is the absolute value of the difference between the threshold voltages before and after the high temperature degradation test, and showed good driving performance as a thin film transistor.
- Example 14 using a 4-naphthoquinonediazide sulfonyl ester compound as a photosensitizer and Example 15 using an adhesion improver resulted in particularly small ⁇ Vth.
- Examples 9 to 13 in which the content of the solvent having nitrogen atoms in the varnish is 0.01% by mass or more and 1.0% by mass or less with respect to the whole organic solvent are stored at a low temperature of ⁇ 40 ° C. for a long time. After that, there was almost no increase in foreign matter, and the result was good.
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Abstract
Description
(1)溶解度パラメーターが8.0以上11.0以下[単位は(cal/cm3)1/2]
(2)炭素原子、水素原子、おおよび酸素原子で構成される有機化合物
まず、前記有機溶剤の第一要件である、(1)溶解度パラメーターが8.0以上11.0以下の有機溶剤について説明する。ここでいう溶解度パラメーターは、複数の物質の相溶性および親和性の指標として用いられるものであり、下記(式1)に表される式で定義される。
ただし、ΔEV[106N・m・mol-1]は蒸発熱、V0[m3・mol―1]は1molあたりの体積である。溶解度パラメーターの値は、低極性のものほど小さく、高極性のものほど大きくなり、例えばn-ヘキサン(7.3)、エタノール(12.7)、水(23.4)である。二つの物質の溶解度パラメーターの差は、その二つの物質が相溶するために必要なエネルギーと密接な関係が有り、溶解度パラメーターの差が小さいほど二つの物質が相溶するために必要なエネルギーは小さなものとなる。すなわち、二つの物質が存在した場合、一般に、溶解度パラメーターの差が小さいほど、親和性が高く、相溶性が高いものとなる。
(3)大気圧における沸点が100℃以上180℃以下
大気圧における沸点が100℃以上の有機溶剤を選択することで、溶剤揮発性が高すぎることに起因する塗布不良を防ぐことができ、180℃以下の有機溶剤を選定することで、硬化後の絶縁層に残存する有機溶剤をさらに低減することができる。
のではない。なお、実施例中の薄膜トランジスタ用感光性樹脂組成物、硬化膜、および薄膜トランジスタの評価は以下の方法により行った。
(1)硬化膜からのアウトガス分析
各参考例に即したワニスを8インチシリコンウェハー上にスピンコート法により塗布し、120℃のホットプレート上で2分間プリベークした。2.38%TMAH水溶液で60秒現像し、純水でリンスした。その後、窒素雰囲気下380℃のオーブン中で60分間キュアして膜厚1.0μmの硬化膜を得た。
本実施例で用いた薄膜トランジスタを図3に示し、以下順に製造方法を説明する。厚さ0.7mmのガラス基板11上に、マグネトロンDCスパッタ法にて厚さ100nmとなるようにアルミニウム膜を成膜した。次に、ポジ型レジスト溶液を塗布した後、90℃のホットプレートで乾燥してレジスト膜を形成した。次に、露光、現像してレジスト膜をパターニングした後、リン硝酸エッチング液を用いてレジストパターンのない領域のみアルミニウムを選択的に除去した。次に、レジスト膜を剥離液(モノエタノールアミン/ジメチルスルホキシド=7/3)を用いて除去した後、純水で洗浄し、100℃のホットプレートで30分間乾燥した。このようにして、ゲート電極12を形成した。次に、各参考例に即した薄膜トランジスタ用感光性樹脂組成物をスピンコート塗布し、100℃のホットプレートで乾燥し、厚さ1000nmのプリベーク膜を作製した。得られたプリベーク膜を2.38%TMAH水溶液で現像し、次いで水でリンスした。次いで窒素雰囲気下380℃のオーブン中で60分間キュアした。このようにして厚さ500nmの硬化膜を得て、それをゲート絶縁層13とした。
東京エレクトロン(株)製塗布・現像装置“CLEAN TRACK ACT-12”を用いて、各参考例に即したろ過直後の薄膜トランジスタ用感光性樹脂組成物を12インチSiウエハ上に塗布し、100℃で3分間、ホットプレートで乾燥させ、膜厚1000nmの感光性樹脂膜を得た。得られた感光性樹脂膜について、(株)トプコン製ウエハ表面検査装置“WM-10”にて0.27μm以上の大きさの異物数を計測した。計測面積はウエハの中心から半径8cmの円の内側の約201cm2とし、塗膜1cm2あたりの異物数を求めた。
ろ過後-40℃で90日間保管した薄膜トランジスタ用感光性樹脂組成物を用いて、前記(3)に記載の方法で感光性樹脂膜を作製し、異物評価を実施した。
2,2-ビス(3-アミノ-4-ヒドロキシフェニル)ヘキサフルオロプロパン(以降BAHFと呼ぶ)18.3g(0.05モル)をアセトン100mL、プロピレンオキシド17.4g(0.3モル)に溶解させ、-15℃に冷却した。ここに3-ニトロベンゾイルクロリド20.4g(0.11モル)をアセトン100mLに溶解させた溶液を滴下した。滴下終了後、-15℃で4時間反応させ、その後室温に戻した。析出した白色固体をろ別し、50℃で真空乾燥した。
乾燥窒素気流下、BAHF29.3g(0.08モル)、1,3-ビス(3-アミノプロピル)テトラメチルジシロキサン1.24g(0.005モル)、末端封止剤として、3-アミノフェノール3.27g(0.03モル)をN-メチル-2-ピロリドン(NMP)150gに溶解した。ここに3,3’,4,4’-ジフェニルエーテルテトラカルボン酸二無水物(以降ODPAと呼ぶ)31.0g(0.1モル)をNMP50gとともに加えて、20℃で1時間撹拌し、次いで50℃で4時間撹拌した。その後、キシレンを15g添加し、水をキシレンとともに共沸しながら、150℃で5時間撹拌した。撹拌終了後、溶液を水3Lに投入して白色沈殿を集めた。この沈殿をろ過で集めて、水で3回洗浄した後、80℃の真空乾燥機で24時間乾燥し、目的のポリイミドであるアルカリ可溶性樹脂(A-1)を得た。
乾燥窒素気流下、ODPA31.0g(0.10モル)をNMP500gに溶解させた。ここに合成例1で得られたヒドロキシル基含有ジアミン化合物45.35g(0.075モル)と1,3-ビス(3-アミノプロピル)テトラメチルジシロキサン1.24g(0.005モル)をNMP50gとともに加えて、20℃で1時間反応させ、次いで50℃で2時間反応させた。次に末端封止剤として4-アミノフェノール4.36g(0.04モル)をNMP5gとともに加え、50℃で2時間反応させた。その後、N,N-ジメチルホルムアミドジメチルアセタール28.6g(0.24モル)をNMP50gで希釈した溶液を10分かけて滴下した。滴下後、50℃で3時間撹拌した。撹拌終了後、溶液を室温まで冷却した後、溶液を水3Lに投入して白色沈殿を得た。この沈殿を濾過で集めて、水で3回洗浄した後、80℃の真空乾燥機で24時間乾燥し、目的のポリイミド前駆体であるアルカリ可溶性樹脂(A-2)を得た。
乾燥窒素気流下、BAHF18.3g(0.05モル)をNMP50g、グリシジルメチルエーテル26.4g(0.3モル)に溶解させ、溶液の温度を-15℃まで冷却した。ここにジフェニルエーテルジカルボン酸ジクロリド(日本農薬(株)製)7.4g(0.025モル)、イソフタル酸クロリド(東京化成(株)製)5.1g(0.025モル)をγ-ブチロラクトン(GBL)25gに溶解させた溶液を内部の温度が0℃を越えないように滴下した。滴下終了後、-15℃で6時間撹拌を続けた。反応終了後、メタノールを10質量%含んだ水3Lに溶液を投入して白色の沈殿を集めた。この沈殿を濾過で集めて、水で3回洗浄した後、80℃の真空乾燥機で24時間乾燥し、目的のポリベンゾオキサゾール前駆体であるアルカリ可溶性樹脂(A-3)を得た。
乾燥窒素気流下、TrisP-PA(商品名、本州化学工業(株)製)21.22g(0.05モル)と5-ナフトキノンジアジドスルホニル酸クロリド36.27g(0.135モル)を1,4-ジオキサン450gに溶解させ、室温にした。ここに、1,4-ジオキサン50gと混合したトリエチルアミン15.18gを、系内が35℃以上にならないように滴下した。滴下後30℃で2時間撹拌した。トリエチルアミン塩を濾過し、ろ液を水に投入した。その後、析出した沈殿をろ過で集めた。この沈殿を真空乾燥機で乾燥させ、下記式で表されるキノンジアジド化合物(B-1)を得た。
乾燥窒素気流下、TrisP-PA(商品名、本州化学工業(株)製)21.22g(0.05モル)と4-ナフトキノンジアジドスルホニル酸クロリド36.27g(0.135モル)を1,4-ジオキサン450gに溶解させ、室温にした。ここに、1,4-ジオキサン50gと混合したトリエチルアミン15.18gを、系内が35℃以上にならないように滴下した。滴下後30℃で2時間撹拌した。トリエチルアミン塩を濾過し、ろ液を水に投入した。その後、析出した沈殿をろ過で集めた。この沈殿を真空乾燥機で乾燥させ、下記式で表されるキノンジアジド化合物(B-2)を得た。
前記合成例2で得られたアルカリ可溶性樹脂(A-1)10.0g、(B-1)1.0gを有機溶剤としてプロピレングリコールモノメチルエーテル(以下PGMEと呼ぶ)40.0gに溶解した後、0.2μmのポリテトラフルオロエチレン製のフィルター(住友電気工業(株)製)で濾過して薄膜トランジスタ用感光性樹脂組成物(ワニス)Aを得た。
製造例1と同様の方法で、化合物の種類と量は表1記載の通りでワニスB~Sを得た。なお、製造例で用いた有機溶剤に関して、分子構造中の窒素原子および酸素原子の有無、溶解度パラメーター、大気圧における沸点について表2に示す。
製造例1~19のワニスを用い、上述の(1)硬化膜からのアウトガス分析で記載の方法に従って硬化膜の作製ならびにアウトガス分析を実施し、また、上述の(2)薄膜トランジスタの特性評価で記載の方法に従って薄膜トランジスタを作製し、その特性評価を実施した。結果を表3に示す。
2:バッファー層
3:ソース領域
4:ドレイン領域
5:半導体層
6:ゲート絶縁層
7:ゲート電極
8:層間絶縁層
9:ソース電極
10:ドレイン電極
11:基板
12:ゲート電極
13:ゲート絶縁層
14:半導体層
15:不純物添加半導体層
16:ソース電極
17:ドレイン電極
18:層間絶縁層
Claims (19)
- (A)アミド基および/またはイミド基を有するアルカリ可溶性樹脂、(B)感光性化合物、ならびに(C)有機溶剤を含有する薄膜トランジスタ用感光性樹脂組成物であり、前記(C)有機溶剤中、窒素原子を有する有機溶剤の含有量が有機溶剤全量に対して1質量%以下である、薄膜トランジスタ用感光性樹脂組成物。
- 前記(C)有機溶剤中、下記(1)および(2)を満足する有機溶剤の含有量が有機溶剤全量に対して80質量%以上である、請求項1に記載の薄膜トランジスタ用感光性樹脂組成物。
(1)溶解度パラメーターが8.0以上11.0以下[単位は(cal/cm3)1/2]
(2)炭素原子、水素原子、および酸素原子で構成される有機化合物 - 前記(C)有機溶剤中、窒素原子を有する有機溶剤の含有量が有機溶剤全量に対して0.01質量%以上1質量%以下である、請求項1または2に記載の薄膜トランジスタ用感光性樹脂組成物。
- 前記(C)有機溶剤中、窒素原子を有する有機溶剤の含有量が有機溶剤全量に対して0.01質量%以上0.5質量%以下である、請求項1または2に記載の薄膜トランジスタ用感光性樹脂組成物。
- 前記(1)および(2)を満足する(C)有機溶剤が、さらに下記(3)を満足する、請求項2~4のいずれかに記載の薄膜トランジスタ用感光性樹脂組成物。
(3)大気圧における沸点が100℃以上180℃以下 - 前記(A)アミド基および/またはイミド基を有するアルカリ可溶性樹脂が、ポリイミド、ポリイミド前駆体、およびポリベンゾオキサゾール前駆体の中から選ばれる少なくとも1種のアルカリ可溶性樹脂またはそれらの共重合体である、請求項1~5のいずれかに記載の薄膜トランジスタ用感光性樹脂組成物。
- 前記(B)感光性化合物が、キノンジアジド化合物である、請求項1~6のいずれかに記載の薄膜トランジスタ用感光性樹脂組成物。
- 前記キノンジアジド化合物が、4-ナフトキノンジアジドスルホニルエステル化合物を含む、請求項7に記載の薄膜トランジスタ用感光性樹脂組成物。
- 前記(B)感光性化合物の含有量が、前記(A)アミド基および/またはイミド基を有するアルカリ可溶性樹脂が、ポリイミド、ポリイミド前駆体、およびポリベンゾオキサゾール前駆体の中から選ばれる少なくとも1種のアルカリ可溶性樹脂100質量部に対して0.1質量部以上20質量部以下である、請求項1~8のいずれかに記載の薄膜トランジスタ用感光性樹脂組成物。
- さらに(D)密着改良剤を含有する、請求項1~9のいずれかに記載の薄膜トランジスタ用感光性樹脂組成物。
- 前記(D)密着改良剤が、窒素原子を有するシランカップリング剤を含有する、請求項10に記載の薄膜トランジスタ用感光性樹脂組成物。
- 請求項1~11のいずれかに記載の薄膜トランジスタ用感光性樹脂組成物を硬化した硬化膜。
- 請求項12に記載の硬化膜を、ゲート絶縁層および層間絶縁層の少なくとも一方に有する、薄膜トランジスタ。
- 請求項12に記載の硬化膜を層間絶縁層に有し、窒化ケイ素、酸化ケイ素、酸窒化ケイ素の少なくともいずれかをゲート絶縁層に有する、トップゲート型である薄膜トランジスタ。
- 請求項13または14に記載の薄膜トランジスタを備える、液晶表示装置または有機電界発光表示装置。
- 請求項1~11のいずれかに記載の薄膜トランジスタ用感光性樹脂組成物を基板に塗布し感光性樹脂膜を形成する工程、前記感光性樹脂膜を乾燥する工程、前記感光性樹脂膜を露光する工程、露光された感光性樹脂膜を現像する工程、および加熱硬化する工程を含む、硬化膜の製造方法。
- 前記加熱硬化する工程が、300℃以上450℃以下で行われる、請求項16に記載の硬化膜の製造方法。
- 請求項16または17に記載の製造方法により得られる硬化膜を用いる、薄膜トランジスタの製造方法。
- 請求項18に記載の製造方法により得られる薄膜トランジスタを用いる、液晶表示装置または有機電界発光表示装置の製造方法。
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| JP7263925B2 (ja) | 2018-06-07 | 2023-04-25 | 東レ株式会社 | 樹脂組成物、硬化膜、硬化膜の製造方法、層間絶縁膜または半導体保護膜、薄膜トランジスタ、および液晶表示装置または有機el表示装置 |
| JP2022124280A (ja) * | 2021-02-15 | 2022-08-25 | 日本放送協会 | 薄膜トランジスタ及びその製造方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| US10199548B2 (en) | 2019-02-05 |
| CN107431020A (zh) | 2017-12-01 |
| CN107431020B (zh) | 2020-07-24 |
| JP6658514B2 (ja) | 2020-03-04 |
| KR20170131382A (ko) | 2017-11-29 |
| SG11201706425PA (en) | 2017-09-28 |
| TWI671592B (zh) | 2019-09-11 |
| TW201701059A (zh) | 2017-01-01 |
| US20180017867A1 (en) | 2018-01-18 |
| KR102245394B1 (ko) | 2021-04-28 |
| JPWO2016158406A1 (ja) | 2018-01-18 |
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