WO2014027618A1

WO2014027618A1 - Thin film transistor

Info

Publication number: WO2014027618A1
Application number: PCT/JP2013/071630
Authority: WO
Inventors: 彰洋田邉; 幸枝伊東
Original assignee: 日本ゼオン株式会社
Priority date: 2012-08-13
Filing date: 2013-08-09
Publication date: 2014-02-20
Also published as: TWI506833B; JP6164218B2; JPWO2014027618A1; TW201409790A

Abstract

Provided is a thin film transistor equipped with a gate insulating film (4) and a semiconductor layer (5) that is formed on the gate insulating film (4), characterized in that: the semiconductor layer (5) is formed of a sputter film that comprises an amorphous oxide semiconductor containing at least one element selected from among In, Ga and Zn; and the gate insulating film (4) is formed of a resin composition that comprises a cyclic olefin polymer (A) having a protonic polar group and an epoxy-type crosslinking agent (B) having at least two epoxy groups per molecule, said epoxy groups being capable of reacting with the protonic polar group.

Description

Thin film transistor

The present invention relates to a thin film transistor, and more particularly to a thin film transistor having high mobility, a large on / off ratio, and a small leakage current.

In recent years, research on organic TFTs (thin film transistors) using organic materials has been actively conducted. Such a thin film transistor is configured, for example, by forming a gate electrode, a gate insulating film, a semiconductor layer, a source electrode, and a drain electrode on the surface of a substrate.

In such a thin film transistor, a technique using an organic semiconductor film as a semiconductor layer is known (see Patent Document 1). However, since a thin film transistor using such an organic semiconductor film has low carrier mobility and low responsiveness, when the thin film transistor using such an organic semiconductor film is used for a display or the like, the screen flickers. Occurs, and there is a problem that the sharpness is lowered. On the other hand, a technique using an amorphous oxide semiconductor such as indium gallium zinc oxide (IGZO) formed by a sputtering method as a semiconductor layer has been studied.

JP 2007-251093 A

However, when a semiconductor film made of an amorphous oxide semiconductor such as IGZO is formed by a sputtering method, the gate insulating film located under the semiconductor film is exposed to a high temperature condition or a plasma generation environment. Therefore, the gate insulating film deteriorates due to the influence of heat and plasma generated when forming the semiconductor film, and as a result, the on / off ratio decreases and the leakage current increases. There is.

An object of the present invention is to provide a thin film transistor having a high mobility, a large on / off ratio, and a small leakage current.

As a result of intensive studies to achieve the above object, the present inventors have found that in a thin film transistor including a gate insulating film and a semiconductor layer formed on the gate insulating film, the semiconductor layer is made of a specific amorphous oxide semiconductor. And a gate insulating film comprising a cyclic olefin polymer having a protic polar group and an epoxy crosslinking agent having two or more epoxy groups in the molecule that react with the protic polar group It has been found that the above object can be achieved by constituting the composition, and the present invention has been completed.

That is, according to the present invention, a thin film transistor comprising a gate insulating film and a semiconductor layer formed on the gate insulating film, wherein the semiconductor layer is at least one element of In, Ga, and Zn. The gate insulating film is composed of a cyclic olefin polymer (A) having a protic polar group and an epoxy group that reacts with the protic polar group in the molecule. A thin film transistor comprising a resin composition containing the epoxy-based crosslinking agent (B) having the above is provided.

Preferably, the content of the epoxy crosslinking agent (B) in the resin composition is 10 to 100 parts by weight with respect to 100 parts by weight of the cyclic olefin polymer (A).
Preferably, the resin composition contains two or more different compounds as the epoxy-based crosslinking agent (B).
Preferably, the resin composition further contains a melamine-based crosslinking agent (C).
Preferably, the content of the melamine crosslinking agent (C) in the resin composition is 10 to 50 parts by weight with respect to 100 parts by weight of the cyclic olefin polymer (A).

In the present invention, the thin film transistor includes a gate electrode provided on a substrate, a gate insulating film provided so as to cover the gate electrode, a semiconductor layer provided on a surface of the gate insulating film, A source electrode and a drain electrode provided on a surface, wherein the semiconductor layer is formed of a sputtered film made of an amorphous oxide semiconductor containing at least one element of In, Ga, and Zn, and the gate insulating film And a resin composition containing a cyclic olefin polymer having a protic polar group (A) and an epoxy-based crosslinking agent (B) having two or more epoxy groups in the molecule that react with the protic polar group. Can be.
Alternatively, in the present invention, the thin film transistor includes a gate electrode provided on the substrate, a gate insulating film provided to cover the gate electrode, and a source provided to cover a part of the surface of the gate insulating film. An electrode and a drain electrode; and a semiconductor layer provided across the surfaces of the gate insulating film, the source electrode and the drain electrode, wherein the semiconductor layer contains at least one element of In, Ga, and Zn An epoxy film composed of a sputtered film made of an oxide semiconductor, wherein the gate insulating film has a cyclic olefin polymer (A) having a protic polar group and two or more epoxy groups in the molecule that react with the protic polar group. It can be comprised from the resin composition containing a type | system | group crosslinking agent (B).
Furthermore, in the present invention, a thin film transistor includes a gate electrode provided on a substrate, a gate insulating film provided so as to cover the gate electrode, a semiconductor layer provided on a surface of the gate insulating film, An etch stopper provided on a part of the surface; and a source electrode and a drain electrode provided on a surface of the semiconductor layer and a part of the surface of the etch stopper, wherein the semiconductor layer is selected from In, Ga, and Zn It is composed of a sputtered film made of an amorphous oxide semiconductor containing at least one element, and the gate insulating film has a cyclic olefin polymer (A) having a protic polar group and an epoxy group that reacts with the protic polar group And a resin composition containing an epoxy-based crosslinking agent (B) having 2 or more in the molecule It is possible.

According to the present invention, it is possible to provide a thin film transistor having a high mobility, a large on / off ratio, and a small leakage current.

FIG. 1 is a cross-sectional view showing an example of a thin film transistor according to the present invention. FIG. 2 is a cross-sectional view showing another example (second example) of the thin film transistor according to the present invention. FIG. 3 is a diagram showing a method of manufacturing a thin film transistor according to the present invention. FIG. 4 is a sectional view showing another example (third example) of the thin film transistor according to the present invention.

The thin film transistor of the present invention is a thin film transistor including a gate insulating film and a semiconductor layer formed on the gate insulating film, and the semiconductor layer contains at least one element of In, Ga, and Zn. The gate insulating film comprises a cyclic olefin polymer (A) having a protic polar group and two or more epoxy groups that react with the protic polar group in the molecule. It is comprised from the resin composition containing an epoxy type crosslinking agent (B), It is characterized by the above-mentioned.
In the following, first, a resin composition for forming a gate insulating film used in the present invention will be described.

(Resin composition)
The resin composition for forming the gate insulating film used in the present invention is composed of a cyclic olefin polymer (A) having a protic polar group and an epoxy system having two or more epoxy groups in the molecule that react with the protic polar group. A crosslinking agent (B).

(Cyclic olefin polymer having a protic polar group (A))
The cyclic olefin polymer (A) having a protic polar group used in the present invention (hereinafter simply referred to as “cyclic olefin polymer (A)”) is a polymer of one or two or more cyclic olefin monomers, Alternatively, a copolymer of one or two or more cyclic olefin monomers and a monomer copolymerizable therewith can be mentioned, and in the present invention, for forming the cyclic olefin polymer (A). As the monomer, it is preferable to use a cyclic olefin monomer (a) having at least a protic polar group.

Here, the protic polar group means a group containing an atom in which a hydrogen atom is directly bonded to an atom belonging to Group 15 or Group 16 of the Periodic Table. Among atoms belonging to Group 15 or Group 16 of the periodic table, atoms belonging to Group 1 or 2 of Group 15 or Group 16 of the Periodic Table are preferable, and oxygen atoms, nitrogen atoms or sulfur are more preferable. An atom, particularly preferably an oxygen atom.

Specific examples of such protic polar groups include polar groups having oxygen atoms such as hydroxyl groups, carboxy groups (hydroxycarbonyl groups), sulfonic acid groups, phosphoric acid groups; primary amino groups, secondary amino groups A polar group having a nitrogen atom such as a primary amide group or a secondary amide group (imide group); a polar group having a sulfur atom such as a thiol group; Among these, those having an oxygen atom are preferable, and a carboxy group is more preferable.
In the present invention, the number of protic polar groups bonded to the cyclic olefin resin having a protic polar group is not particularly limited, and different types of protic polar groups may be included.

Specific examples of the cyclic olefin monomer (a) having a protic polar group (hereinafter referred to as “monomer (a)” where appropriate) include 2-hydroxycarbonylbicyclo [2.2.1] hept- 5-ene, 2-methyl-2-hydroxycarbonylbicyclo [2.2.1] hept-5-ene, 2-carboxymethyl-2-hydroxycarbonylbicyclo [2.2.1] hept-5-ene, 2 , 3-dihydroxycarbonylbicyclo [2.2.1] hept-5-ene, 2-hydroxycarbonyl-3-hydroxycarbonylmethylbicyclo [2.2.1] hept-5-ene, 3-methyl-2-hydroxy Carbonylbicyclo [2.2.1] hept-5-ene, 3-hydroxymethyl-2-hydroxycarbonylbicyclo [2.2.1] hept-5-ene, 2- Mud butoxycarbonyl tricyclo [5.2.1.0 ^{2, 6]} deca-3,8-diene, 4-hydroxy carbonyl tetracyclo [6.2.1.1 ^{3, 6.} 0 ^2,7 ] dodec-9-ene, 4-methyl-4-hydroxycarbonyltetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4,5-dihydroxycarbonyltetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4-carboxymethyl-4-hydroxycarbonyltetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, N- (hydroxycarbonylmethyl) bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (hydroxycarbonylethyl) bicyclo [2 2.1] hept-5-ene-2,3-dicarboximide, N- (hydroxycarbonylpentyl) bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (Dihydroxycarbonylethyl) bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (dihydroxycarbonylpropyl) bicyclo [2.2.1] hept-5-ene-2, 3-dicarboximide, N- (hydroxycarbonylphenethyl) bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (hydro Cicarbonylphenethyl) bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (2- (4-hydroxyphenyl) -1- (hydroxycarbonyl) ethyl) bicyclo [2. 2.1] Carboxy groups such as hept-5-ene-2,3-dicarboximide and N- (hydroxycarbonylphenyl) bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide Containing cyclic olefins; 2- (4-hydroxyphenyl) bicyclo [2.2.1] hept-5-ene, 2-methyl-2- (4-hydroxyphenyl) bicyclo [2.2.1] hept-5- Ene, 4- (4-hydroxyphenyl) tetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4-methyl-4- (4-hydroxyphenyl) tetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 2-hydroxybicyclo [2.2.1] hept-5-ene, 2-hydroxymethylbicyclo [2.2.1] hept-5-ene, 2-hydroxyethyl Bicyclo [2.2.1] hept-5-ene, 2-methyl-2-hydroxymethylbicyclo [2.2.1] hept-5-ene, 2,3-dihydroxymethylbicyclo [2.2.1] Hept-5-ene, 2- (hydroxyethoxycarbonyl) bicyclo [2.2.1] hept-5-ene, 2-methyl-2- (hydroxyethoxycarbonyl) bicyclo [2.2.1] hept-5 Ene, 2- (1-hydroxy-1-trifluoromethyl-2,2,2-trifluoroethyl) bicyclo [2.2.1] hept-5-ene, 2- (2-hydroxy-2-trifluoro Mechi 3,3,3-trifluoropropyl) bicyclo [2.2.1] hept-5-ene, 3-hydroxy-tricyclo [5.2.1.0 ^{2, 6]} deca-4,8-diene, 3-hydroxymethyltricyclo [5.2.1.0 ^2,6 ] deca-4,8-diene, 4-hydroxytetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4-hydroxymethyltetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4,5-dihydroxymethyltetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4- (hydroxyethoxycarbonyl) tetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4-methyl-4- (hydroxyethoxycarbonyl) tetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, N- (hydroxyethyl) bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (hydroxyphenyl) bicyclo [2.2 .1] Hydroxyl-containing cyclic olefins such as hept-5-ene-2,3-dicarboximide and the like. Among these, a carboxy group-containing cyclic olefin is preferable from the viewpoint of improving the adhesion of the obtained gate insulating film, and 4-hydroxycarbonyltetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene is particularly preferred. These monomers (a) may be used alone or in combination of two or more.

The content ratio of the monomer (a) unit in the cyclic olefin polymer (A) is preferably 10 to 90 mol%, more preferably 20 to 80 mol%, based on all monomer units. More preferably, it is 30 to 70 mol%. By setting the content ratio of the monomer (a) unit within the above range, the cyclic olefin polymer (A) has sufficient solubility in a polar solvent, and strength and insulation in the case of a gate insulating film. The property can be improved.

The cyclic olefin polymer (A) used in the present invention is obtained by copolymerizing a cyclic olefin monomer (a) having a protic polar group and a monomer (b) copolymerizable therewith. It may be a copolymer. Examples of such copolymerizable monomers include cyclic olefin monomers (b1) having polar groups other than protic polar groups, cyclic olefin monomers having no polar groups (b2), and cyclic olefins. Monomer (b3) (hereinafter referred to as “monomer (b1)”, “monomer (b2)”, “monomer (b3)” as appropriate).

Examples of the cyclic olefin monomer (b1) having a polar group other than the protic polar group include N-substituted imide groups, ester groups, cyano groups, and cyclic olefins having a halogen atom.

Examples of the cyclic olefin having an N-substituted imide group include a monomer represented by the following formula (1) or a monomer represented by the following formula (2).

(In the above formula (1), R ¹ .n represents an alkyl group or an aryl group having 1 to 16 carbon hydrogen or carbon is 1 to 2 integer.)

(In the above formula (2), R ² is a divalent alkylene group having 1 to 3 carbon atoms, R ³ is a monovalent alkyl group having 1 to 10 carbon atoms, or a monovalent alkyl group having 1 to 10 carbon atoms. Represents a halogenated alkyl group.)

In the above formula (1), R ¹ is an alkyl group or aryl group having 1 to 16 carbon atoms. Specific examples of the alkyl group include a methyl group, an ethyl group, an n-propyl group, an n-butyl group, an n group -Pentyl group, n-hexyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decyl group, n-undecyl group, n-dodecyl group, n-tridecyl group, n-tetradecyl group, n -Linear alkyl groups such as pentadecyl group and n-hexadecyl group; cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group, cycloheptyl group, cyclooctyl group, cyclononyl group, cyclodecyl group, cycloundecyl group, cyclododecyl group , Norbornyl group, bornyl group, isobornyl group, decahydronaphthyl group, tricyclodecanyl group, adamantyl group, etc. Alkyl group; 2-propyl group, 2-butyl group, 2-methyl-1-propyl group, 2-methyl-2-propyl group, 1-methylbutyl group, 2-methylbutyl group, 1-methylpentyl group, 1-ethylbutyl Groups, branched alkyl groups such as 2-methylhexyl group, 2-ethylhexyl group, 4-methylheptyl group, 1-methylnonyl group, 1-methyltridecyl group, 1-methyltetradecyl group, and the like. Specific examples of the aryl group include a benzyl group. Among these, an alkyl group and an aryl group having 6 to 14 carbon atoms are preferable, and an alkyl group and an aryl group having 6 to 10 carbon atoms are more preferable because of excellent heat resistance and solubility in a polar solvent. When the carbon number is 4 or less, the solubility in a polar solvent is poor, and when the carbon number is 17 or more, the heat resistance is poor.

Specific examples of the monomer represented by the above formula (1) include bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N-phenyl-bicyclo [2.2. 1] Hept-5-ene-2,3-dicarboximide, N-methylbicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N-ethylbicyclo [2.2. 1] Hept-5-ene-2,3-dicarboximide, N-propylbicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N-butylbicyclo [2.2. 1] Hept-5-ene-2,3-dicarboximide, N-cyclohexylbicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N-cyclohexylbicyclo [2.2. 1] Hept-5-ene-2,3-dica Boxyimide, N-adamantylbicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (1-methylbutyl) -bicyclo [2.2.1] hept-5-ene-2 , 3-dicarboximide, N- (2-methylbutyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (1-methylpentyl) -bicyclo [2. 2.1] hept-5-ene-2,3-dicarboximide, N- (2-methylpentyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N -(1-Ethylbutyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (2-ethylbutyl) -bicyclo [2.2.1] hept-5-ene -2,3-dicarboximide N- (1-methylhexyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (2-methylhexyl) -bicyclo [2.2.1] hept- 5-ene-2,3-dicarboximide, N- (3-methylhexyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (1-butylpentyl) ) -Bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (2-butylpentyl) -bicyclo [2.2.1] hept-5-ene-2,3 -Dicarboximide, N- (1-methylheptyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (2-methylheptyl) -bicyclo [2.2 .1] Hept-5-ene-2,3-dicarboxyl N- (3-methylheptyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (4-methylheptyl) -bicyclo [2.2.1] Hept-5-ene-2,3-dicarboximide, N- (1-ethylhexyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (2-ethylhexyl) ) -Bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (3-ethylhexyl) -bicyclo [2.2.1] hept-5-ene-2,3- Dicarboximide, N- (1-propylpentyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (2-propylpentyl) -bicyclo [2.2. 1] Hept-5-ene-2,3-dicar Boxyimide, N- (1-methyloctyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (2-methyloctyl) -bicyclo [2.2.1] Hept-5-ene-2,3-dicarboximide, N- (3-methyloctyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (4- Methyloctyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (1-ethylheptyl) -bicyclo [2.2.1] hept-5-ene-2 , 3-dicarboximide, N- (2-ethylheptyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (3-ethylheptyl) -bicyclo [2 2.1] Hept-5-ene-2,3- Carboximide, N- (4-ethylheptyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (1-propylhexyl) -bicyclo [2.2.1 ] Hept-5-ene-2,3-dicarboximide, N- (2-propylhexyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (3 -Propylhexyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (1-methylnonyl) -bicyclo [2.2.1] hept-5-ene-2 , 3-dicarboximide, N- (2-methylnonyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (3-methylnonyl) -bicyclo [2.2 .1] Hept-5-ene-2 3-dicarboximide, N- (4-methylnonyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (5-methylnonyl) -bicyclo [2.2. 1] Hept-5-ene-2,3-dicarboximide, N- (1-ethyloctyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- ( 2-ethyloctyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (3-ethyloctyl) -bicyclo [2.2.1] hept-5-ene -2,3-dicarboximide, N- (4-ethyloctyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (1-methyldecyl) -bicyclo [ 2.2.1] Hept-5-ene-2, 3-dicarboximide, N- (1-methyldodecyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (1-methylundecyl) -bicyclo [2 2.1] hept-5-ene-2,3-dicarboximide, N- (1-methyldodecyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (1-methyltridecyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (1-methyltetradecyl) -bicyclo [2.2.1] Hept-5-ene-2,3-dicarboximide, N- (1-methylpentadecyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N-phenyl- Tetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene-4,5-dicarboximide, N- (2,4-dimethoxyphenyl) -tetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene-4,5-dicarboximide and the like. These may be used alone or in combination of two or more.

On the other hand, in the above formula (2), R ² is a divalent alkylene group having 1 to 3 carbon atoms. Examples of the divalent alkylene group having 1 to 3 carbon atoms include a methylene group, an ethylene group, a propylene group, and an isovalent group. A propylene group is mentioned. Among these, a methylene group and an ethylene group are preferable because of good polymerization activity.

In the above formula (2), R ³ is a monovalent alkyl group having 1 to 10 carbon atoms or a monovalent halogenated alkyl group having 1 to 10 carbon atoms. Examples of the monovalent alkyl group having 1 to 10 carbon atoms include methyl group, ethyl group, propyl group, isopropyl group, butyl group, sec-butyl group, tert-butyl group, hexyl group and cyclohexyl group. . Examples of the monovalent halogenated alkyl group having 1 to 10 carbon atoms include a fluoromethyl group, a chloromethyl group, a bromomethyl group, a difluoromethyl group, a dichloromethyl group, a difluoromethyl group, a trifluoromethyl group, a trichloromethyl group, Examples include 2,2,2-trifluoroethyl group, pentafluoroethyl group, heptafluoropropyl group, perfluorobutyl group, and perfluoropentyl group. Among these, because of excellent solubility in polar solvents, as R ^3, methyl and ethyl are preferred.

The monomers represented by the above formulas (1) and (2) can be obtained, for example, by an amidation reaction between a corresponding amine and 5-norbornene-2,3-dicarboxylic acid anhydride. The obtained monomer can be efficiently isolated by separating and purifying the reaction solution of the amidation reaction by a known method.

Examples of the cyclic olefin having an ester group include 2-acetoxybicyclo [2.2.1] hept-5-ene, 2-acetoxymethylbicyclo [2.2.1] hept-5-ene, and 2-methoxycarbonyl. Bicyclo [2.2.1] hept-5-ene, 2-ethoxycarbonylbicyclo [2.2.1] hept-5-ene, 2-propoxycarbonylbicyclo [2.2.1] hept-5-ene, 2-butoxycarbonylbicyclo [2.2.1] hept-5-ene, 2-cyclohexyloxycarbonylbicyclo [2.2.1] hept-5-ene, 2-methyl-2-methoxycarbonylbicyclo [2.2 .1] Hept-5-ene, 2-methyl-2-ethoxycarbonylbicyclo [2.2.1] hept-5-ene, 2-methyl-2-propoxyl Nilbicyclo [2.2.1] hept-5-ene, 2-methyl-2-butoxycarbonylbicyclo [2.2.1] hept-5-ene, 2-methyl-2-cyclohexyloxycarbonylbicyclo [2.2 .1] Hept-5-ene, 2- (2,2,2-trifluoroethoxycarbonyl) bicyclo [2.2.1] hept-5-ene, 2-methyl-2- (2,2,2- Trifluoroethoxycarbonyl) bicyclo [2.2.1] hept-5-ene, 4-acetoxytetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4-methoxycarbonyltetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4-ethoxycarbonyltetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4-propoxycarbonyltetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4-butoxycarbonyltetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4-methyl-4-methoxycarbonyltetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4-methyl-4-ethoxycarbonyltetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4-methyl-4-propoxycarbonyltetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4-methyl-4-butoxycarbonyltetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4- (2,2,2-trifluoroethoxycarbonyl) tetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4-methyl-4- (2,2,2-trifluoroethoxycarbonyl) tetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene and the like.

As the cyclic olefin having a cyano group, for example, 4-cyanotetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4-methyl-4-cyanotetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4,5-dicyanotetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 2-cyanobicyclo [2.2.1] hept-5-ene, 2-methyl-2-cyanobicyclo [2.2.1] hept-5-ene, 2 , 3-dicyanobicyclo [2.2.1] hept-5-ene, and the like.

Examples of the cyclic olefin having an acid anhydride group include, for example, tetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene-4,5-dicarboxylic anhydride, bicyclo [2.2.1] hept-5-ene-2,3-dicarboxylic anhydride, 2-carboxymethyl-2- Hydroxycarbonylbicyclo [2.2.1] hept-5-ene anhydride, and the like.

Examples of the cyclic olefin having a halogen atom include 2-chlorobicyclo [2.2.1] hept-5-ene, 2-chloromethylbicyclo [2.2.1] hept-5-ene, 2- (chlorophenyl). ) Bicyclo [2.2.1] hept-5-ene, 4-chlorotetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene, 4-methyl-4-chlorotetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-9-ene and the like.

These monomers (b1) may be used alone or in combination of two or more.

Examples of the cyclic olefin monomer (b2) having no polar group include bicyclo [2.2.1] hept-2-ene (also referred to as “norbornene”), 5-ethyl-bicyclo [2.2.1]. Hept-2-ene, 5-butyl-bicyclo [2.2.1] hept-2-ene, 5-ethylidene-bicyclo [2.2.1] hept-2-ene, 5-methylidene-bicyclo [2. 2.1] hept-2-ene, 5-vinyl-bicyclo [2.2.1] hept-2-ene, tricyclo [5.2.1.0 ^2,6 ] deca-3,8-diene (conventional name: dicyclopentadiene), tetracyclo [10.2.1.0 ^2,11. 0 ^4,9 ] pentadeca-4,6,8,13-tetraene, tetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-4-ene (also referred to as “tetracyclododecene”), 9-methyl-tetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-4-ene, 9-ethyl-tetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-4-ene, 9-methylidene-tetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-4-ene, 9-ethylidene-tetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-4-ene, 9-vinyl-tetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-4-ene, 9-propenyl-tetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] dodec-4-ene, pentacyclo [9.2.1.1 ^3,9 . 0 ^2,10 . 0 ^4,8 ] pentadeca-5,12-diene, cyclobutene, cyclopentene, cyclopentadiene, cyclohexene, cycloheptene, cyclooctene, cyclooctadiene, indene, 3a, 5,6,7a-tetrahydro-4,7-methano-1H -Indene, 9-phenyl-tetracyclo [6.2.1.1 ^3,6 . 0 ^2,7] dodeca-4-ene, tetracyclo ^{[9.2.1.0 2,10.} 0 ^3,8 ] tetradeca-3,5,7,12-tetraene, pentacyclo [9.2.1.1 ^3,9 . 0 ^2,10 . 0 ^4,8 ] pentadeca-12-ene and the like.
These monomers (b2) may be used alone or in combination of two or more.

Specific examples of the monomer (b3) other than the cyclic olefin include ethylene; propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 3-methyl-1-pentene, 3- Ethyl-1-pentene, 4-methyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-hexene, 4,4-dimethyl-1-pentene, 4-ethyl-1-hexene, Α-olefins having 2 to 20 carbon atoms such as 3-ethyl-1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, etc .; 1,5 Non-conjugated dienes such as hexadiene, 1,4-hexadiene, 4-methyl-1,4-hexadiene, 5-methyl-1,4-hexadiene, 1,7-octadiene, and the like Conductor; and the like. Of these, α-olefins, particularly ethylene, are preferred.
These monomers (b3) may be used alone or in combination of two or more.

Among these monomers (b1) to (b3), the cyclic olefin monomer (b1) having a polar group other than the protic polar group is preferable from the viewpoint that the effect of the present invention becomes more remarkable. A cyclic olefin having an N-substituted imide group is particularly preferred.

The content ratio of the copolymerizable monomer (b) unit in the cyclic olefin polymer (A) is preferably 10 to 90 mol%, more preferably 20 to 80%, based on all monomer units. The mol% is more preferably 30 to 70 mol%. When the content ratio of the copolymerizable monomer (b) unit is within the above range, the cyclic olefin polymer (A) has sufficient solubility in the polar solvent, and the gate insulating film is formed. The strength and insulation at can be improved.

In addition, in this invention, it is good also as a cyclic olefin polymer (A) by introduce | transducing a protic polar group into a cyclic olefin polymer which does not have a protic polar group using a well-known modifier.
A polymer having no protic polar group is obtained by polymerizing at least one of the above-described monomers (b1) and (b2) and optionally combining the monomer (b3) as necessary. be able to.

As the modifier for introducing a protic polar group, a compound having a protic polar group and a reactive carbon-carbon unsaturated bond in one molecule is usually used.
Specific examples of such compounds include acrylic acid, methacrylic acid, angelic acid, tiglic acid, oleic acid, elaidic acid, erucic acid, brassic acid, maleic acid, fumaric acid, citraconic acid, mesaconic acid, itaconic acid, atropaic acid. Unsaturated carboxylic acids such as acid and cinnamic acid; allyl alcohol, methyl vinyl methanol, crotyl alcohol, methallyl alcohol, 1-phenylethen-1-ol, 2-propen-1-ol, 3-butene-1- All, 3-buten-2-ol, 3-methyl-3-buten-1-ol, 3-methyl-2-buten-1-ol, 2-methyl-3-buten-2-ol, 2-methyl- Unsatisfactory such as 3-buten-1-ol, 4-penten-1-ol, 4-methyl-4-penten-1-ol, 2-hexen-1-ol Alcohol; and the like.
The modification reaction of the polymer using these modifiers may be performed according to a conventional method, and is usually performed in the presence of a radical generator.

The cyclic olefin polymer (A) used in the present invention may be a ring-opening polymer obtained by ring-opening polymerization of the above-mentioned monomer, or an addition polymer obtained by addition polymerization of the above-mentioned monomer. Although it may be a polymer, it is preferably a ring-opening polymer from the viewpoint that the effect of the present invention becomes more remarkable.

The ring-opening polymer comprises a ring-opening metathesis polymerization of a cyclic olefin monomer having a protic polar group (a) and a copolymerizable monomer (b) used as necessary in the presence of a metathesis reaction catalyst. Can be manufactured. As the production method, for example, methods described in [0039] to [0079] of International Publication No. 2010/110323 can be used.

The weight average molecular weight (Mw) of the cyclic olefin polymer (A) used in the present invention is usually 1,000 to 1,000,000, preferably 1,500 to 100,000, more preferably 2,000 to 10 , 000.
In addition, the molecular weight distribution of the cyclic olefin polymer (A) is usually 4 or less, preferably 3 or less, more preferably 2.5 or less, as a weight average molecular weight / number average molecular weight (Mw / Mn) ratio. In addition, the weight average molecular weight (Mw) and molecular weight distribution (Mw / Mn) of the cyclic olefin polymer (A) are converted into polystyrene values by gel permeation chromatography (GPC) using a solvent such as tetrahydrofuran as an eluent. Is the value obtained as

(Epoxy-based cross-linking agent (B) having two or more epoxy groups in the molecule)
In addition to the above-mentioned cyclic olefin polymer (A), the resin composition for forming the gate insulating film used in the present invention contains an epoxy group that reacts with the protic polar group of the cyclic olefin polymer (A) in the molecule. 2 or more contains an epoxy-based crosslinking agent (B) (hereinafter simply referred to as “epoxy-based crosslinking agent (B)”).

In the present invention, as the resin composition for forming the gate insulating film, the heat resistance of the gate insulating film obtained by using the resin composition containing the cyclic olefin polymer (A) and the epoxy-based crosslinking agent (B). And the plasma resistance can be improved, so that even when sputtering is performed to form a semiconductor film, deterioration of the gate insulating film due to heat and plasma generated when the sputtering is performed is reduced. It can be effectively prevented. Thus, the obtained thin film transistor can have high mobility, a large on / off ratio, and a small leakage current.

The epoxy crosslinking agent (B) used in the present invention is not particularly limited as long as it is a compound having two or more epoxy groups in the molecule that react with the protic polar group of the cyclic olefin polymer (A). Moreover, as an epoxy group, either a terminal epoxy group or an alicyclic epoxy group may be sufficient.

Examples of such an epoxy crosslinking agent (B) include bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenol novolac type epoxy resin, cresol novolac type epoxy resin, polyphenol type epoxy resin, cycloaliphatic epoxy resin, Examples thereof include glycidyl ether compounds and epoxy acrylate polymers.

Specific examples of the epoxy-based crosslinking agent (B) include a trifunctional epoxy compound having a dicyclopentadiene skeleton (trade name “XD-1000”, manufactured by Nippon Kayaku Co., Ltd.), 2,2-bis (hydroxymethyl). ) 1,2-Epoxy-4- (2-oxiranyl) cyclohexane adduct of 1-butanol (15 functional alicyclic epoxy resin having cyclohexane skeleton and terminal epoxy group, trade name “EHPE3150”, Daicel Chemical Industries, Ltd.) ), Epoxidized 3-cyclohexene-1,2-dicarboxylate bis (3-cyclohexenylmethyl) modified ε-caprolactone (aliphatic cyclic trifunctional epoxy resin, trade name “Epolide GT301”, manufactured by Daicel Chemical Industries, Ltd.) ), Epoxidized butanetetracarboxylic acid tetrakis (3-cyclohexenylmethyl) modified ε-capro An epoxy compound having an alicyclic structure such as a lactone (alicyclic cyclic tetrafunctional epoxy resin having an alicyclic epoxy group, trade name “Epolide GT401”, manufactured by Daicel Chemical Industries, Ltd.);

Aromatic amine type polyfunctional epoxy compound (trade name “H-434”, manufactured by Tohto Kasei Kogyo Co., Ltd.), cresol novolac type polyfunctional epoxy compound (trade name “EOCN-1020”, manufactured by Nippon Kayaku Co., Ltd.), phenol novolac type Polyfunctional epoxy compounds (Epicoat 152, 154, manufactured by Japan Epoxy Resin Co., Ltd.), polyfunctional epoxy compounds having a naphthalene skeleton (trade name EXA-4700, manufactured by Dainippon Ink & Chemicals, Inc.), chain alkyl polyfunctional epoxy compounds (products) Name “SR-TMP” (Sakamoto Yakuhin Kogyo Co., Ltd.), polyfunctional epoxy polybutadiene (trade name “Epolide PB3600”, Daicel Chemical Industries, Ltd.), glycerin glycidyl polyether compound (trade name “SR-GLG”, Sakamoto) Yakuhin Kogyo Co., Ltd.), diglycerin polyglycidyl ether Epoxy having no alicyclic structure such as compound (trade name “SR-DGE”, Sakamoto Pharmaceutical Co., Ltd., polyglycerin polyglycidyl ether compound (trade name “SR-4GL”, Sakamoto Pharmaceutical Co., Ltd.) A compound;

Among the epoxy-based crosslinking agents (B), a compound having an alicyclic structure is preferable, and an epoxy group having an alicyclic structure is preferable because the effect of improving the heat resistance of the obtained gate insulating film is high. A compound having 3 or more is more preferable.

Further, in the present invention, the heat resistance and plasma resistance of the obtained gate insulating film can be further improved, whereby when sputtering is performed when sputtering is performed to form a semiconductor film. It is preferable to use a combination of two or more different compounds as the epoxy-based crosslinking agent (B) from the viewpoint that the effect of suppressing deterioration of the gate insulating film due to generated heat and plasma can be further enhanced. In this case, the two or more different compounds may be used in combination of two or more compounds whose chemical structures can be determined to be substantially different. For example, the above-described compounds may be used in appropriate combination. However, from the viewpoint that the effect of improving heat resistance can be further enhanced, a compound having a molecular weight (Mw) of less than 1,000 (preferably 800 or less) and a molecular weight (Mw) of 1,000 or more (preferably Are preferably used in combination with 2,000 or more compounds. Or similarly, it is also preferable to use combining the compound which has a terminal epoxy group, and the compound which has an alicyclic epoxy group from the point that the improvement effect of heat resistance and plasma resistance can be heightened more.

The content of the epoxy crosslinking agent (B) in the resin composition used in the present invention is preferably 10 to 100 parts by weight, more preferably 20 to 70 parts by weight with respect to 100 parts by weight of the cyclic olefin polymer (A). Part, more preferably 40 to 60 parts by weight. By making content of an epoxy type crosslinking agent (B) into the said range, the heat resistance and plasma resistance of the gate insulating film obtained can be improved appropriately.

(Melamine cross-linking agent (C))
The resin composition for forming the gate insulating film used in the present invention further contains a melamine-based crosslinking agent (C) in addition to the cyclic olefin polymer (A) and the epoxy-based crosslinking agent (B) described above. Preferably it is. By further containing the melamine-based crosslinking agent (C), it is possible to further improve the heat resistance and plasma resistance of the obtained gate insulating film, and thus when sputtering is performed to form a semiconductor film. The effect of suppressing deterioration of the gate insulating film due to heat and plasma generated when sputtering is performed can be further enhanced.

The melamine-based crosslinking agent (C) used in the present invention has a melamine skeleton and reacts with the cyclic olefin polymer (A) to form a crosslinked structure between the cyclic olefin polymers (A). However, in the present invention, a compound represented by the following formula (3) can be preferably used.

In the above formula (3), R ⁴ to R ⁹ each independently represents a hydrogen atom or —CH ₂ OR ¹⁰ group (where R ¹⁰ is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms), and R ⁴ At least one of -R ⁹ is a -CH ₂ OR ¹⁰ group. R ⁴ to R ⁹ may be the same or different from each other. In the above formula (3), among the alkoxymethyl groups having 1 to 6 carbon atoms represented by —CH ₂ OR ¹⁰ , an alkoxymethyl group in which R ¹⁰ has 1 to 4 carbon atoms is preferable. Specifically, a methoxymethyl group, an ethoxymethyl group, a propoxymethyl group, and a butoxymethyl group are preferable, and a methoxymethyl group is particularly preferable.

Specific examples of the melamine-based crosslinking agent (C) include methylol groups such as N, N, N ′, N ′, N ″, N ″-(hexaalkoxyalkyl) melamine, imino groups, and the like. Good melamines (trade names “Cymel 303, Cymel 325, Cymel 350, Cymel 370, Cymel 232, Cymel 235, Cymel 272, Cymel 212, My Coat 506” {and above, made by Cytec Industries, Inc.} My coat series).

The content of the melamine crosslinking agent (C) in the resin composition used in the present invention is preferably 10 to 100 parts by weight, more preferably 10 to 50 parts by weight with respect to 100 parts by weight of the cyclic olefin polymer (A). Parts, more preferably 20 to 50 parts by weight. The content of the melamine crosslinking agent (C) is related to the content of the epoxy crosslinking agent (B) described above, and the weight of “epoxy crosslinking agent (B): melamine crosslinking agent (C)”. The ratio is preferably in the range of 1: 3 to 3: 1 and more preferably in the range of 1: 2 to 2: 1. By making content of a melamine type crosslinking agent (C) into the said range, the heat resistance and plasma resistance of the gate insulating film obtained can be improved appropriately.

(Other ingredients)
The resin composition used in the present invention may further contain a solvent. The solvent is not particularly limited, and is known as a resin composition solvent such as acetone, methyl ethyl ketone, cyclopentanone, 2-hexanone, 3-hexanone, 2-heptanone, 3-heptanone, 4-heptanone, 2- Linear ketones such as octanone, 3-octanone and 4-octanone; alcohols such as n-propyl alcohol, isopropyl alcohol, n-butyl alcohol and cyclohexanol; ethers such as ethylene glycol dimethyl ether, ethylene glycol diethyl ether and dioxane Alcohol alcohols such as ethylene glycol monomethyl ether and ethylene glycol monoethyl ether; propyl formate, butyl formate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate Esters such as methyl butyrate, ethyl butyrate, methyl lactate and ethyl lactate; cellosolve esters such as cellosolve acetate, methyl cellosolve acetate, ethyl cellosolve acetate, propyl cellosolve acetate, butyl cellosolve acetate; propylene glycol, propylene glycol monomethyl ether, propylene glycol monomethyl Propylene glycols such as ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monobutyl ether; diety such as diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol methyl ethyl ether Glycols; saturated γ-lactones such as γ-butyrolactone, γ-valerolactone, γ-caprolactone, and γ-caprolactone; halogenated hydrocarbons such as trichloroethylene; aromatic hydrocarbons such as toluene and xylene; Examples include polar solvents such as dimethylacetamide, dimethylformamide, and N-methylacetamide. These solvents may be used alone or in combination of two or more. The content of the solvent is preferably in the range of 10 to 10,000 parts by weight, more preferably 50 to 5000 parts by weight, and further preferably 100 to 1000 parts by weight with respect to 100 parts by weight of the cyclic olefin polymer (A). In addition, when a solvent is contained in the resin composition, the solvent is usually removed after forming the gate insulating film.

Further, the resin composition used in the present invention is an antioxidant, a surfactant, a compound having an acidic group or a heat-latent acidic group, a coupling agent, or the like, as long as the effect of the present invention is not inhibited. It may contain other compounding agents such as derivatives, sensitizers, light stabilizers, antifoaming agents, pigments, dyes and fillers. Among these, for example, those described in JP 2011-75609 A can be used as the coupling agent or derivative thereof, the sensitizer, and the light stabilizer.

Although it does not specifically limit as antioxidant, For example, the phenolic antioxidant, phosphorus antioxidant, sulfur antioxidant, amine antioxidant, lactone type oxidation which are used for the usual polymer are used. An inhibitor or the like can be used. By containing an antioxidant, the light resistance and heat resistance of the obtained gate insulating film can be improved.

As the phenolic antioxidant, conventionally known ones can be used, for example, 2-t-butyl-6- (3-t-butyl-2-hydroxy-5-methylbenzyl) -4-methylphenyl acrylate, 2 , 4-di-t-amyl-6- [1- (3,5-di-t-amyl-2-hydroxyphenyl) ethyl] phenyl acrylate and the like, and JP-A Nos. 63-179953 and 1-168643. Acrylate-based compounds described in the publication No. 2,6-di-t-butyl-4-methylphenol, 2,6-di-t-butyl-4-ethylphenol, octadecyl-3- (3,5- Di-tert-butyl-4-hydroxyphenyl) propionate, 2,2'-methylene-bis (4-methyl-6-tert-butylphenol), 4,4'-butylidene-bis (6 t -butyl-m-cresol), 4,4′-thiobis (3-methyl-6-t-butylphenol), bis (3-cyclohexyl-2-hydroxy-5-methylphenyl) methane, 3,9-bis [ 2- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] -1,1-dimethylethyl] -2,4,8,10-tetraoxaspiro [5,5] undecane 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, pentaerythritol-tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) ) Propionate], triethyleneglycol bis [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate], tocopherol, etc. 6- (4-hydroxy-3,5-di-t-butylanilino) -2,4-bis-octylthio-1,3,5-triazine, 6- (4-hydroxy-3,5) -Dimethylanilino) -2,4-bis-octylthio-1,3,5-triazine, 6- (4-hydroxy-3-methyl-5-t-butylanilino) -2,4-bis-octylthio-1, Triazine group-containing phenolic compounds such as 3,5-triazine, 2-octylthio-4,6-bis- (3,5-di-t-butyl-4-oxyanilino) -1,3,5-triazine; Can be used.

The phosphorus antioxidant is not particularly limited as long as it is usually used in the general resin industry. For example, triphenyl phosphite, diphenylisodecyl phosphite, phenyl diisodecyl phosphite, tris (nonylphenyl) ) Phosphite, tris (dinonylphenyl) phosphite, tris (2,4-di-tert-butylphenyl) phosphite, tris (2-tert-butyl-4-methylphenyl) phosphite, tris (cyclohexylphenyl) Phosphite, 2,2′-methylenebis (4,6-di-t-butylphenyl) octyl phosphite, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 10-(3 5-di-t-butyl-4-hydroxybenzyl) -9,10-dihydro Monophosphite compounds such as 9-oxa-10-phosphaphenanthrene-10-oxide, 10-decyloxy-9,10-dihydro-9-oxa-10-phosphaphenanthrene; 4,4′-butylidene-bis ( 3-methyl-6-t-butylphenyl-di-tridecyl phosphite), 4,4′-isopropylidene-bis [phenyl-di-alkyl (C12 -C15) phosphite], 4,4′-isopropylidene -Bis [diphenylmonoalkyl (C12 -C15) phosphite], 1,1,3-tris (2-methyl-4-di-tridecylphosphite-5-tert-butylphenyl) butane, tetrakis (2,4 -Di-t-butylphenyl) -4,4'-biphenylene diphosphite, cyclic neopentanetetraylbis (Octadecyl phosphite), cyclic neopentanetetrayl bis (isodecyl phosphite), cyclic neopentane tetrayl bis (nonylphenyl phosphite), cyclic neopentane tetrayl bis (2,4-di-t- Diphosphite compounds such as butylphenyl phosphite), cyclic neopentanetetrayl bis (2,4-dimethylphenyl phosphite), cyclic neopentanetetrayl bis (2,6-di-t-butylphenyl phosphite) Etc. can be used. Among these, monophosphite compounds are preferable, and tris (nonylphenyl) phosphite, tris (dinonylphenyl) phosphite, tris (2,4-di-t-butylphenyl) phosphite and the like are particularly preferable.

Examples of the sulfur-based antioxidant include

dilauryl

3,3′-thiodipropionate,

dimyristyl

3,3′-thiodipropionate,

distearyl

3,3′-thiodipropionate,

laurylstearyl

3,3 ′. -Thiodipropionate, pentaerythritol-tetrakis- (β-lauryl-thio-propionate), 3,9-bis (2-dodecylthioethyl) -2,4,8,10-tetraoxaspiro [5,5] Undecane or the like can be used.

Among these, phenolic antioxidants are preferable, and pentaerythritol-tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] is more preferable.
These antioxidants can be used alone or in combination of two or more.

The content of the antioxidant in the resin composition used in the present invention is preferably 0.1 to 10 parts by weight, more preferably 1 to 5 parts by weight with respect to 100 parts by weight of the cyclic olefin polymer (A). Part. When the content of the antioxidant is in the above range, the light resistance and heat resistance of the obtained gate insulating film can be improved.

界面 Surfactant is used for the purpose of preventing striations (after coating). Examples of the surfactant include silicone surfactants, fluorine surfactants, polyoxyalkylene surfactants, methacrylic acid copolymer surfactants, and acrylic acid copolymer surfactants. it can.

Examples of the silicone surfactant include “SH28PA”, “SH29PA”, “SH30PA”, “ST80PA”, “ST83PA”, “ST86PA”, “SF8416”, “SH203”, “SH230”, “SF8419”, “SF8422”, “FS1265”, “SH510”, “SH550”, “SH710”, “SH8400”, “SF8410”, “SH8700”, “SF8427” (above, manufactured by Toray Dow Corning Co., Ltd.), product name “ “KP-321”, “KP-323”, “KP-324”, “KP-340”, “KP-341” (manufactured by Shin-Etsu Chemical Co., Ltd.), trade names “TSF400”, “TSF401”, “ "TSF410", "TSF4440", "TSF4445", "TSF4450", "T “F4446”, “TSF4452”, “TSF4460” (manufactured by Momentive Performance Materials Japan GK), product names “BYK300”, “BYK301”, “BYK302”, “BYK306”, “BYK307”, “BYK310” ”,“ BYK315 ”,“ BYK320 ”,“ BYK322 ”,“ BYK323 ”,“ BYK331 ”,“ BYK333 ”,“ BYK370 ”“ BYK375 ”,“ BYK377 ”,“ BYK378 ”(above, manufactured by BYK Japan) Can be mentioned.

Examples of the fluorosurfactant include Fluorinert “FC-430”, “FC-431” (manufactured by Sumitomo 3M Limited), Surflon “S-141”, “S-145”, “S-381”. , “S-393” (manufactured by Asahi Glass Co., Ltd.), EFtop (registered trademark) “EF301”, “EF303”, “EF351”, “EF352” (manufactured by Gemco Co., Ltd.), Megafuck (registered trademark) ) “F171”, “F172”, “F173”, “R-30” (above, manufactured by DIC Corporation).
Examples of the polyoxyalkylene surfactant include polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene octylphenyl ether, polyoxyethylene nonylphenyl ether, and the like. And polyethylene glycol dilaurate, polyethylene glycol distearate polyoxyethylene dialkyl esters, and the like.
These surfactants can be used alone or in combination of two or more.

The content of the surfactant in the resin composition used in the present invention is preferably 0.01 to 0.5 parts by weight, more preferably 0.8 parts per 100 parts by weight of the cyclic olefin polymer (A). 02 to 0.2 parts by weight. When the content of the surfactant is in the above range, the effect of preventing striation (after the application stripe) can be further enhanced.

The compound having an acidic group or a thermal latent acidic group is not particularly limited as long as it has an acidic group or a thermal latent acidic group that generates an acidic group by heating, but is preferably an aliphatic compound, an aromatic compound, Heterocyclic compounds, more preferably aromatic compounds and heterocyclic compounds.
These compounds having an acidic group or a heat-latent acidic group can be used alone or in combination of two or more.

The number of acidic groups and thermal latent acidic groups of the compound having an acidic group or thermal latent acidic group is not particularly limited, but those having a total of two or more acidic groups and / or thermal latent acidic groups are preferable. . The acidic group or the heat latent acidic group may be the same as or different from each other.
The acidic group may be any acidic functional group, and specific examples thereof include strongly acidic groups such as sulfonic acid group and phosphoric acid group; weak acidic groups such as carboxy group, thiol group and carboxymethylenethio group; Can be mentioned. Among these, a carboxy group, a thiol group or a carboxymethylenethio group is preferable, and a carboxy group is particularly preferable. Among these acidic groups, those having an acid dissociation constant pKa in the range of 3.5 to 5.0 are preferred. When there are two or more acidic groups, it is preferable that the first dissociation constant pKa1 is an acid dissociation constant and the first dissociation constant pKa1 is in the above range. The pKa is obtained according to pKa = −logKa by measuring the acid dissociation constant Ka = [H ₃ O ⁺ ] [B ⁻ ] / [BH] under dilute aqueous solution conditions. Here, BH represents an organic acid, and B ⁻ represents a conjugate base of the organic acid.
In addition, the measuring method of pKa can calculate hydrogen ion concentration, for example using a pH meter, and can calculate from the density | concentration of a relevant substance, and hydrogen ion concentration.

The heat-latent acidic group may be any group that generates an acidic functional group upon heating. Specific examples thereof include a sulfonium base, a benzothiazolium base, an ammonium base, a phosphonium base, a block carboxylic acid group, and the like. Is mentioned. Among these, a block carboxylic acid group is preferable. The carboxy group blocking agent used to obtain the blocked carboxylic acid group is not particularly limited, but is preferably a vinyl ether compound.

Furthermore, the compound having an acidic group or a thermal latent acidic group may have a substituent other than the acidic group and the thermal latent acidic group.
As such substituents, in addition to hydrocarbon groups such as alkyl groups and aryl groups, halogen atoms; alkoxy groups, aryloxy groups, acyloxy groups, heterocyclic oxy groups; substituted with alkyl groups, aryl groups, or heterocyclic groups Polar groups having no proton such as amino group, acylamino group, ureido group, sulfamoylamino group, alkoxycarbonylamino group, aryloxycarbonylamino group; alkylthio group, arylthio group, heterocyclic thio group; Examples thereof include a hydrocarbon group substituted with a polar group having no proton.

Among the compounds having such an acidic group or thermal latent acidic group, specific examples of the compound having an acidic group include methanoic acid, ethanoic acid, propanoic acid, butanoic acid, pentanoic acid, butanoic acid, pentanoic acid, hexanoic acid. , Heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, glycolic acid, glyceric acid, ethanedioic acid (also referred to as “oxalic acid”), propanedioic acid (also referred to as “malonic acid”), butanedioic acid (“ Succinic acid "), pentanedioic acid, hexanedioic acid (also called" adipic acid "), 1,2-cyclohexanedicarboxylic acid, 2-oxopropanoic acid, 2-hydroxybutanedioic acid, 2-hydroxypropane Tricarboxylic acid, mercapto succinic acid, dimercapto succinic acid, 2,3-dimercapto-1-propanol, 1,2,3-trimercaptopropane, 2,3,4-trimercapto-1-butanol, 2,4-dimercapto-1,3-butanediol, 1,3,4-trimercapto-2-butanol, 3,4-dimercapto-1,2-butane Aliphatic compounds such as diol and 1,5-dimercapto-3-thiapentane;

Benzoic acid, p-hydroxybenzenecarboxylic acid, o-hydroxybenzenecarboxylic acid, 2-naphthalenecarboxylic acid, methylbenzoic acid, dimethylbenzoic acid, trimethylbenzoic acid, 3-phenylpropanoic acid, dihydroxybenzoic acid, dimethoxybenzoic acid, benzene -1,2-dicarboxylic acid (also referred to as “phthalic acid”), benzene-1,3-dicarboxylic acid (also referred to as “isophthalic acid”), benzene-1,4-dicarboxylic acid (also referred to as “terephthalic acid”) ), Benzene-1,2,3-tricarboxylic acid, benzene-1,2,4-tricarboxylic acid, benzene-1,3,5-tricarboxylic acid, benzenehexacarboxylic acid, biphenyl-2,2′-dicarboxylic acid 2- (carboxymethyl) benzoic acid, 3- (carboxymethyl) benzoic acid, 4- (carboxymethyl) ) Benzoic acid, 2- (carboxycarbonyl) benzoic acid, 3- (carboxycarbonyl) benzoic acid, 4- (carboxycarbonyl) benzoic acid, 2-mercaptobenzoic acid, 4-mercaptobenzoic acid, diphenolic acid, 2-mercapto -6-naphthalenecarboxylic acid, 2-mercapto-7-naphthalenecarboxylic acid, 1,2-dimercaptobenzene, 1,3-dimercaptobenzene, 1,4-dimercaptobenzene, 1,4-naphthalenedithiol, 1, 5-naphthalenedithiol, 2,6-naphthalenedithiol, 2,7-naphthalenedithiol, 1,2,3-trimercaptobenzene, 1,2,4-trimercaptobenzene, 1,3,5-trimercaptobenzene, 1 , 2,3-Tris (mercaptomethyl) benzene, 1,2,4-tris (mercaptomethyl) ) Benzene, 1,3,5-tris (mercaptomethyl) benzene, 1,2,3-tris (mercaptoethyl) benzene, 1,2,4-tris (mercaptoethyl) benzene, 1,3,5-tris ( Aromatic compounds such as mercaptoethyl) benzene;

Nicotinic acid, isonicotinic acid, 2-furoic acid, pyrrole-2,3-dicarboxylic acid, pyrrole-2,4-dicarboxylic acid, pyrrole-2,5-dicarboxylic acid, pyrrole-3,4-dicarboxylic acid, imidazole 5-membered containing nitrogen atoms such as 2,4-dicarboxylic acid, imidazole-2,5-dicarboxylic acid, imidazole-4,5-dicarboxylic acid, pyrazole-3,4-dicarboxylic acid, pyrazole-3,5-dicarboxylic acid Heterocyclic compounds: thiophene-2,3-dicarboxylic acid, thiophene-2,4-dicarboxylic acid, thiophene-2,5-dicarboxylic acid, thiophene-3,4-dicarboxylic acid, thiazole-2,4-dicarboxylic acid, thiazole -2,5-dicarboxylic acid, thiazole-4,5-dicarboxylic acid, isothiazole-3,4-dicarboxylic acid, isothiazo -3,5-dicarboxylic acid, 1,2,4-thiadiazole-2,5-dicarboxylic acid, 1,3,4-thiadiazole-2,5-dicarboxylic acid, 3-amino-5-mercapto-1, 2,4-thiadiazole, 2-amino-5-mercapto-1,3,4-thiadiazole, 3,5-dimercapto-1,2,4-thiadiazole, 2,5-dimercapto-1,3,4-thiadiazole, 3- (5-mercapto-1,2,4-thiadiazol-3-ylsulfanyl) succinic acid, 2- (5-mercapto-1,3,4-thiadiazol-2-ylsulfanyl) succinic acid, (5-mercapto -1,2,4-thiadiazol-3-ylthio) acetic acid, (5-mercapto-1,3,4-thiadiazol-2-ylthio) acetic acid, 3- (5-mercapto-1,2, -Thiadiazol-3-ylthio) propionic acid, 2- (5-mercapto-1,3,4-thiadiazol-2-ylthio) propionic acid, 3- (5-mercapto-1,2,4-thiadiazol-3-ylthio) ) Succinic acid, 2- (5-mercapto-1,3,4-thiadiazol-2-ylthio) succinic acid, 4- (3-mercapto-1,2,4-thiadiazol-5-yl) thiobutanesulfonic acid, 5-membered heterocyclic compounds containing nitrogen and sulfur atoms such as 4- (2-mercapto-1,3,4-thiadiazol-5-yl) thiobutanesulfonic acid;

Pyridine-2,3-dicarboxylic acid, pyridine-2,4-dicarboxylic acid, pyridine-2,5-dicarboxylic acid, pyridine-2,6-dicarboxylic acid, pyridine-3,4-dicarboxylic acid, pyridine-3,5 -Dicarboxylic acid, pyridazine-3,4-dicarboxylic acid, pyridazine-3,5-dicarboxylic acid, pyridazine-3,6-dicarboxylic acid, pyridazine-4,5-dicarboxylic acid, pyrimidine-2,4-dicarboxylic acid, pyrimidine -2,5-dicarboxylic acid, pyrimidine-4,5-dicarboxylic acid, pyrimidine-4,6-dicarboxylic acid, pyrazine-2,3-dicarboxylic acid, pyrazine-2,5-dicarboxylic acid, pyridine-2,6- Dicarboxylic acid, triazine-2,4-dicarboxylic acid, 2-diethylamino-4,6-dimercapto-s-triazine, 2-dipropyl Mino-4,6-dimercapto-s-triazine, 2-dibutylamino-4,6-dimercapto-s-triazine, 2-anilino-4,6-dimercapto-s-triazine, 2,4,6-trimercapto- 6-membered heterocyclic compounds containing a nitrogen atom such as s-triazine.
Among these, it is preferable that the number of acidic groups in the compound having an acidic group is two or more from the viewpoint that the adhesion of the obtained gate insulating film can be further improved.

In addition, among the compounds having an acidic group or a thermal latent acidic group, as a specific example of a compound having a thermal latent acidic group, a compound obtained by converting the acidic group of the compound having an acidic group into a thermal latent acidic group is used. Can be mentioned. For example, 1,2,4-benzenetricarboxylic acid tris (1-propoxyethyl) obtained by converting a carboxy group of 1,2,4-benzenetricarboxylic acid into a block carboxylic acid group has a heat latent acidic group. It can be used as a compound. From the viewpoint that the adhesiveness of the obtained gate insulating film can be further improved, the number of heat latent acidic groups in the compound having a heat latent acidic group is preferably two or more.

The content of the compound having an acidic group or a heat-latent acidic group in the resin composition used in the present invention is preferably 0.1 to 50 parts by weight with respect to 100 parts by weight of the cyclic olefin polymer (A). The range is preferably 1 to 45 parts by weight, more preferably 2 to 40 parts by weight, and still more preferably 3 to 30 parts by weight. By making the usage-amount of the compound which has an acidic group or a thermal latent acidic group into the said range, the resin composition can be made excellent in liquid stability.

The preparation method of the resin composition used by this invention is not specifically limited, What is necessary is just to mix each component which comprises a resin composition by a well-known method.
The mixing method is not particularly limited, but it is preferable to mix a solution or dispersion obtained by dissolving or dispersing each component constituting the resin composition in a solvent. Thereby, a resin composition is obtained with the form of a solution or a dispersion liquid.

The method for dissolving or dispersing each component constituting the resin composition in a solvent may be in accordance with a conventional method. Specifically, stirring using a stirrer and a magnetic stirrer, a high-speed homogenizer, a disper, a planetary stirrer, a twin-screw stirrer, a ball mill, a three-roll, etc. can be used. Further, after each component is dissolved or dispersed in a solvent, it may be filtered using, for example, a filter having a pore size of about 0.5 μm.

(Thin film transistor)
Next, the thin film transistor of the present invention will be described. The thin film transistor of the present invention includes a gate insulating film made of the resin composition described above and a semiconductor layer formed on the gate insulating film, and the semiconductor layer is at least one of In, Ga, and Zn. It is comprised from the sputtered film which consists of an amorphous oxide semiconductor containing these elements. FIG. 1 shows a cross-sectional view of a thin film transistor 1 as an example of the thin film transistor of the present invention. As shown in FIG. 1, a thin film transistor 1 has a bottom gate top contact having a gate electrode 3, a gate insulating film 4 made of the above resin composition, a semiconductor layer 5, a source electrode 6 and a drain electrode 7 on a substrate 2. Type thin film transistor. Although FIG. 1 shows a single thin film transistor 1, a configuration in which a plurality of thin film transistors 1 are formed on a substrate 2 (for example, an active matrix substrate) may be used. The thin film transistor 1 shown in FIG. 1 is an example of the thin film transistor of the present invention. In the following description, the thin film transistor 1 shown in FIG. 1 will be described as an example, but the thin film transistor of the present invention has the configuration shown in FIG. It is not limited at all.

The substrate 2 is not particularly limited, and is a flexible substrate made of a flexible plastic such as polycarbonate, polyimide, polyethylene terephthalate, alicyclic olefin polymer, glass substrate such as quartz, soda glass, inorganic alkali glass, silicon wafer, etc. The silicon substrate can be mentioned.

The gate electrode 3 is made of a conductive material. Examples of conductive materials include platinum, gold, silver, nickel, chromium, copper, iron, tin, antimony lead, tantalum, indium, palladium, tellurium, rhenium, iridium, aluminum, ruthenium, germanium, molybdenum, tungsten, and oxide. Tin antimony, indium tin oxide (ITO), fluorine-doped zinc oxide, zinc, carbon, graphite, glassy carbon, silver paste and carbon paste, lithium, beryllium, magnesium, potassium, calcium, scandium, titanium, manganese, zirconium, Gallium, niobium, sodium, sodium-potassium alloy, magnesium / copper mixture, magnesium / silver mixture, magnesium / aluminum mixture, magnesium / indium mixture, aluminum / oxide Miniumu mixture of lithium / aluminum mixture, aluminum / titanium mixture include molybdenum / titanium mixture like. In addition, known conductive polymers whose conductivity is improved by doping or the like, such as conductive polyaniline, conductive polypyrrole, and conductive polythiophene (polyethylenedioxythiophene and polystyrenesulfonic acid complex, etc.) can be mentioned. Of these, chromium, molybdenum, aluminum / titanium mixtures, and molybdenum / titanium mixtures are preferred, chromium, aluminum / titanium mixtures, and molybdenum / titanium mixtures are more preferred, and aluminum / titanium mixtures and molybdenum / titanium mixtures are particularly preferred. preferable. The gate electrode 3 is formed in a predetermined pattern on the substrate 2 by, for example, forming the above-described conductive material on the substrate 2 by sputtering or the like and then performing an etching process.

The gate insulating film 4 is composed of the above-described resin composition, and the above-described resin composition is applied onto the substrate 2 on which the gate electrode 3 is formed in a predetermined pattern, and the solvent is removed as necessary. Later, it is formed by curing. As a method for applying the resin composition, for example, various methods such as a spray method, a spin coating method, a roll coating method, a die coating method, a doctor blade method, a spin coating method, a bar coating method, and a screen printing method may be adopted. Can do. The curing temperature is usually 100 to 300 ° C., preferably 100 to 250 ° C., more preferably 100 to 150 ° C., and the curing time is usually 0.5 to 300 minutes, preferably 1 to 150 minutes, more preferably. Is 1 to 60 minutes. The thickness of the gate insulating film 4 is not particularly limited, but is preferably 100 to 400 nm, more preferably 100 to 300 nm, and still more preferably 100 to 200 nm.

The semiconductor layer 5 is a sputtered film made of an amorphous oxide semiconductor containing at least one element of In, Ga, and Zn. As the amorphous oxide semiconductor, any element containing at least one element of In, Ga, and Zn may be used. For example, zinc oxide (ZnO), indium zinc oxide (IZO), zinc tin oxide ( ZTO), aluminum zinc oxide (AZO), gallium zinc oxide (GZO), indium gallium zinc oxide (IGZO), and the like.

The semiconductor layer 5 is usually formed by a sputtering method. Specifically, a target made of a metal oxide that will form the semiconductor layer 5 is sputtered to form a sputtered film made of a metal oxide (amorphous oxide semiconductor) on the surface of the gate insulating film 4. The The thickness of the semiconductor layer 5 is preferably 10 to 100 nm, more preferably 20 to 80 nm, and still more preferably 30 to 50 nm.

The source electrode 6 and the drain electrode 7 are made of a conductive material. As the conductive material, the same material as the gate electrode 3 described above can be used. The source electrode 6 and the drain electrode 7 are formed in a predetermined pattern on the semiconductor layer 5 by, for example, forming the above-described conductive material on the semiconductor layer 5 by sputtering or the like and then performing an etching process. .

In the above, the bottom gate top contact type thin film transistor 1 as shown in FIG. 1 is illustrated as an example of the thin film transistor. However, the gate insulating film made of the resin composition according to the present invention is as shown in FIG. The gate insulating film of the bottom gate bottom contact type thin film transistor 1a can be suitably used, and the thin film transistor 1a can also be obtained in the same manner as described above. In the thin film transistor 1a shown in FIG. 2, the same components as those of the thin film transistor 1 described above are denoted by the same reference numerals, and the description thereof is omitted. That is, the thin film transistor 1a shown in FIG. 2 includes the gate electrode 3, the gate insulating film 4, the source electrode 6 and the drain electrode 7 made of the above-described resin composition on the substrate 2, and the gate insulating film 4 and the source electrode 6 The semiconductor layer 5 is formed on the drain electrode 7 across the drain electrode 7.

Alternatively, the gate insulating film made of the resin composition according to the present invention can also be suitably used as a gate insulating film of an etch stop layer type thin film transistor 1b as shown in FIG. Here, FIG. 4 is a cross-sectional view showing an etch stop layer type thin film transistor 1b provided with a gate insulating film made of the resin composition according to the present invention. The description is omitted. In the thin film transistor 1 b shown in FIG. 4, an etch stopper 8 is formed so as to cover the channel portion 9. That is, as shown in FIG. 4, in this thin film transistor 1b, a gate electrode 3, a gate insulating film 4 made of the above-described resin composition, and a semiconductor layer 5 are formed on a substrate 2. An etch stopper 8 is formed, and the source electrode 6 and the drain electrode 7 are respectively provided so as to cover the vicinity of the end of the semiconductor layer 5 and the vicinity of the end of the etch stopper 9.

In the present invention, the gate insulating film 4 is formed of the resin composition described above, and the resin composition contains the cyclic olefin polymer (A) and the epoxy-based crosslinking agent (B), and has heat resistance. And it has excellent plasma resistance. Therefore, when the semiconductor layer 5 is formed on the gate insulating film 4, even if the gate insulating film 4 is formed by a sputtering method in which the gate insulating film 4 is exposed to high temperature or plasma, thermal deterioration and plasma deterioration of the gate insulating film 4 are effective. Can be prevented. Therefore, an amorphous oxide semiconductor film containing at least one element of In, Ga, and Zn, which is a material having higher carrier mobility than an organic semiconductor and needs to be formed by a sputtering method, is used as the semiconductor layer 5. Can be used.

Therefore, according to the present invention, it is possible to effectively prevent deterioration of the gate insulating film 4 during sputtering, whereby the obtained thin film transistor can be excellent in on / off ratio and leakage current characteristics. In addition, since the semiconductor layer 5 can be formed of an amorphous oxide semiconductor having excellent carrier mobility, it is possible to provide a thin film transistor with high mobility, high on / off ratio, and low leakage current. It can be done.

Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. Parts and% in each example are based on weight unless otherwise specified.
In addition, the definition and evaluation method of each characteristic are as follows.

<Mobility>
The electrical characteristics of the obtained thin film transistor were evaluated using a semiconductor parameter analyzer (manufactured by Agilent, 4156C) in the air and in a dark room. As a result, the obtained thin film transistor exhibited characteristics as a p-type transistor element. Then, the drain voltage Vd was fixed at Vd = 10 V, and the gate voltage (Vg) was changed from Vg = + 20 V to −20 V, thereby evaluating the transfer characteristics using a semiconductor parameter analyzer. Note that the obtained thin film transistor has a saturated region, and in this example, field effect mobility was obtained from this saturated region.
In addition, the following formula was used to calculate the field effect mobility of the thin film transistor. The higher the mobility, the better.
Id = μCinW (Vg−Vth) ² / 2L
(Where Cin is the capacitance per unit area of the gate insulating film, W is the channel width, L is the channel length, Vg is the gate voltage, Id is the drain current, μ is the mobility, and Vth is the gate where the channel begins to form. Threshold voltage.)

<On / off ratio>
About the obtained thin-film transistor, the current at the time of on and the current at the time of off are measured using a semiconductor tester (manufactured by Advantest Co., Ltd., R6425), and an on / off ratio (on / off) is calculated by calculating these ratios. (Off current ratio) was measured. The higher the on / off ratio, the better. In this example, 1 × 10 ⁵ or more was considered good.

<Leakage current>
With respect to the obtained thin film transistor, a voltage of 20 V is applied between the source electrode and the drain electrode in the atmosphere / dark room, and the voltage applied to the gate electrode is changed from +20 V to −20 V, so that the source electrode and the drain electrode Was measured using a manual prober and a semiconductor parameter analyzer (manufactured by Agilent, 4156C) to measure the leakage current. The lower the leak current, the better. In this example, 1 × 10 ⁻¹² or less was considered good.

<< Synthesis Example 1 >>
<Preparation of Cyclic Olefin Polymer (A-1)>
N- (2-ethylhexyl) -bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide 40 mol%, and 4-hydroxycarbonyltetracyclo [6.2.1.1 ^{3, 6} . 0 ^2,7 ] Dodeca-9-ene 60 parts by mole monomer mixture 100 parts, 1,5-hexadiene 2 parts, (1,3-dimesityrylimidazoline-2-ylidene) (tricyclohexylphosphine) benzylidene 0.02 part of ruthenium dichloride (synthesized by the method described in Org. Lett., Vol. 1, page 953, 1999) and 200 parts of diethylene glycol ethyl methyl ether were charged into a nitrogen pressure-resistant glass pressure-resistant reactor. The mixture was reacted for 4 hours at 80 ° C. with stirring to obtain a polymerization reaction solution.

Then, the obtained polymerization reaction liquid was put in an autoclave and stirred for 5 hours at 150 ° C. under a hydrogen pressure of 4 MPa to perform a hydrogenation reaction, thereby obtaining a polymer solution containing the cyclic olefin polymer (A-1). . The resulting cyclic olefin polymer (A-1) had a polymerization conversion rate of 99.7%, a polystyrene-equivalent weight average molecular weight of 7,150, a number average molecular weight of 4,690, a molecular weight distribution of 1.52, and a hydrogenation rate. Was 99.7%. The solid content concentration of the obtained polymer solution of the cyclic olefin polymer (A-1) was 34.4% by weight.

Example 1
<Preparation of resin composition>
As the cyclic olefin polymer (A), 291 parts of a polymer solution of the cyclic olefin polymer (A-1) obtained in Synthesis Example 1 (100 parts as the cyclic olefin polymer (A-1)), an epoxy crosslinking agent (B), epoxidized butanetetracarboxylic acid tetrakis (3-cyclohexenylmethyl) modified ε-caprolactone (trade name “Epolide GT401”, manufactured by Daicel Chemical Industries, Ltd., an aliphatic cyclic tetrafunctional group having a cyclic epoxy group Epoxy resin, molecular weight (Mw) = 730) 30 parts, pentaerythritol-tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] (trade name “Irganox 1010”) as oxidant , BASF) 1.5 parts, as surfactant, silicone surfactant (trade name "KP341") 0.03 part (manufactured by Shin-Etsu Chemical Co., Ltd.) and 100 parts of ethylene glycol dimethyl ether as a solvent were mixed and dissolved, and then filtered through a polytetrafluoroethylene filter having a pore diameter of 0.45 μm to prepare a resin composition. .

<Production of Thin Film Transistor>
Next, the thin film transistor 1 shown in FIG. 1 was obtained using the resin composition obtained above. FIG. 3 is a diagram illustrating a method for manufacturing the thin film transistor 1.
(1) Pretreatment A glass substrate was prepared, and the prepared glass substrate was subjected to ultrasonic cleaning in pure water, dried by air blow, and baked at 100 ° C. for 1 hour.
(2) Formation of Gate Electrode Next, as shown in FIG. 3A, an aluminum layer is formed on the glass substrate (substrate 2) pretreated above by vacuum deposition, and this aluminum layer is patterned. Thereby, the gate electrode 3 was formed. The thickness of the gate electrode 3 was 50 nm.
(3) Formation of Gate Insulating Film Next, the substrate 2 on which the gate electrode 3 is formed is placed on a spin coater, and a predetermined amount of the resin composition obtained above is dropped on the glass substrate 2, and the substrate 2 is placed at about 2000 rpm. A coating film was formed by rotating at a rotational speed of about 60 seconds. Thereafter, the substrate 2 on which the coating film was formed was baked on a hot plate at a temperature of 150 ° C. for about 60 minutes, thereby forming the gate insulating film 4 as shown in FIG. The thickness of the gate insulating film 4 was 200 nm.
(4) Formation of Semiconductor Active Layer Next, as shown in FIG. 3C, indium gallium zinc oxide is formed on the gate insulating film 4 of the substrate 2 on which the gate electrode 3 and the gate insulating film 4 are formed by sputtering. A semiconductor layer 5 made of a sputtered film of (IGZO) was formed with a thickness of 40 nm. A sputtered film of indium gallium zinc oxide (IGZO) was produced by using a sputtering apparatus (product name “CFS-4EP-LL”, manufactured by Shibaura Mechatronics Inc.) in the presence of argon gas, with an output of 300 W, an argon flow rate of 10 sccm, The film was formed under conditions of an oxygen flow rate of 10 sccm and a film forming pressure of 0.6 Pa. Note that indium gallium zinc oxide (IGZO) was used as a sputtering target.
(5) Formation of source and drain electrodes
Next, gold is deposited on the semiconductor layer 5 of the substrate 2 on which the gate electrode 3, the gate insulating film 4 and the semiconductor layer 5 are formed by vacuum vapor deposition, and the gold layer is patterned to thereby form the source electrode 6 and the drain electrode. 7 was obtained, so that the thin film transistor 1 shown in FIG. The thickness of the source electrode 6 and the drain electrode 7 was 50 nm.

And each evaluation of mobility, ON / OFF ratio, and leakage current was performed using the thin film transistor obtained above. The results are shown in Table 1.

Example 2
In preparing the resin composition for forming the gate insulating film 4, the blending amount of the epoxidized butanetetracarboxylic acid tetrakis (3-cyclohexenylmethyl) modified ε-caprolactone as the epoxy crosslinking agent (B) is 30. A resin composition and a thin film transistor were obtained and evaluated in the same manner as in Example 1 except that the amount was changed from 50 parts to 50 parts. The results are shown in Table 1.

Example 3
In preparing a resin composition for forming the gate insulating film 4, as an epoxy-based crosslinking agent (B), instead of 30 parts of epoxidized butanetetracarboxylic acid tetrakis (3-cyclohexenylmethyl) modified ε-caprolactone 1,2-epoxy-4- (2-oxiranyl) cyclohexane adduct of 2,2-bis (hydroxymethyl) 1-butanol (trade name “EHPE3150”, manufactured by Daicel Chemical Industries, Ltd., cyclohexane skeleton and terminal epoxy group) The resin composition and the thin film transistor were obtained and evaluated in the same manner as in Example 1 except that 30 parts of a 15-functional alicyclic epoxy resin having a molecular weight (Mw) = 2234) was used. The results are shown in Table 1.

Example 4
In preparing a resin composition for forming the gate insulating film 4, in addition to 30 parts of epoxidized butanetetracarboxylic acid tetrakis (3-cyclohexenylmethyl) modified ε-caprolactone as an epoxy-based crosslinking agent (B) Resin composition in the same manner as in Example 1 except that 30 parts of 1,2-epoxy-4- (2-oxiranyl) cyclohexane adduct of 2,2-bis (hydroxymethyl) 1-butanol was further used. A thin film transistor was obtained and evaluated in the same manner. The results are shown in Table 1.

Example 5
In preparing the resin composition for forming the gate insulating film 4, N, N, N ′, N ′, N ″, N ″-(hexaalkoxyalkyl) is used as the melamine-based crosslinking agent (C). A resin composition and a thin film transistor were obtained and evaluated in the same manner as in Example 1 except that 30 parts of a partially methylol-substituted melamine (trade name “Cymel 350”, manufactured by Cytec Industries) were further used. It was. The results are shown in Table 1.

Example 6
In preparing the resin composition for forming the gate insulating film 4, N, N, N ′, N ′, N ″, N ″-(hexaalkoxyalkyl) is used as the melamine-based crosslinking agent (C). A resin composition and a thin film transistor were obtained and evaluated in the same manner as in Example 1 except that 30 parts of a partially methylol-substituted melamine (trade name “Cymel 370”, manufactured by Cytec Industries, Inc.) was further used. It was. The results are shown in Table 1.

<< Comparative Example 1 >>
When preparing the resin composition for forming the gate insulating film 4, epoxidized butanetetracarboxylic acid tetrakis (3-cyclohexenylmethyl) modified ε-caprolactone as an epoxy crosslinking agent (B) was not blended. Except for the above, a resin composition and a thin film transistor were obtained in the same manner as in Example 1 and evaluated in the same manner. The results are shown in Table 1.

<< Comparative Example 2 >>
When preparing the resin composition for forming the gate insulating film 4, epoxidized butanetetracarboxylic acid tetrakis (3-cyclohexenylmethyl) modified ε-caprolactone as an epoxy crosslinking agent (B) was not blended. Except for the above, a resin composition and a thin film transistor were obtained in the same manner as in Example 5 and evaluated in the same manner. The results are shown in Table 1.

<< Comparative Example 3 >>
When preparing the resin composition for forming the gate insulating film 4, epoxidized butanetetracarboxylic acid tetrakis (3-cyclohexenylmethyl) modified ε-caprolactone as an epoxy crosslinking agent (B) was not blended. Except for the above, a resin composition and a thin film transistor were obtained in the same manner as in Example 6 and evaluated in the same manner. The results are shown in Table 1.

<< Comparative Example 4 >>
A thin film transistor was obtained in the same manner as in Comparative Example 1 except that the semiconductor layer 5 was formed of an a-Si layer (amorphous silicon layer) instead of the sputtered film of indium gallium zinc oxide (IGZO). Evaluation was performed. The a-Si layer (amorphous silicon layer) was formed with a thickness of 100 nm using a CVD apparatus (the same applies to Comparative Examples 5 and 6 described later). The results are shown in Table 1.

<< Comparative Example 5 >>
A thin film transistor was obtained in the same manner as in Comparative Example 2 except that the semiconductor layer 5 was formed of an a-Si layer (amorphous silicon layer) instead of the sputtered film of indium gallium zinc oxide (IGZO). Evaluation was performed. The results are shown in Table 1.

<< Comparative Example 6 >>
A thin film transistor was obtained in the same manner as in Comparative Example 3 except that the semiconductor layer 5 was formed of an a-Si layer (amorphous silicon layer) instead of the sputtered film of indium gallium zinc oxide (IGZO). Evaluation was performed. The results are shown in Table 1.

As shown in Table 1, the gate insulating film 4 is formed using a resin composition containing a cyclic olefin polymer (A) and an epoxy-based crosslinking agent (B), and the semiconductor layer 5 is made of indium gallium zinc. In Examples 1 to 6 formed using an oxide (IGZO) sputtered film, the obtained thin film transistor had high mobility, a large on / off ratio, and a small leakage current. In particular, in Examples 1 to 6, since the gate insulating film 4 was formed of a resin composition containing the cyclic olefin polymer (A) and the epoxy-based crosslinking agent (B), the semiconductor layer 5 was formed. Degradation of the gate insulating film 4 due to the effects of heat and plasma generated during sputtering can be effectively suppressed, and the resulting thin film transistor has high mobility and a high on / off ratio. It was possible to make the leakage current small. In addition, among Examples 1 to 6, Example 4 using two kinds of compounds as an epoxy-based crosslinking agent (B), and a combination of an epoxy-based crosslinking agent (B) and a melamine-based crosslinking agent (C) In Examples 5 and 6, the mobility, on / off ratio, and leakage current characteristics were particularly excellent.

On the other hand, in Comparative Examples 1 to 3 in which the gate insulating film 4 is formed using a resin composition that does not contain an epoxy-based crosslinking agent (B), the thin film transistors obtained are inferior in on / off ratio and leakage current. It was. In Comparative Examples 1 to 3, the reason why the on / off ratio and the leakage current are reduced is that the sputtering is performed when the semiconductor layer 5 is formed by the sputtering method after the gate insulating film 4 is formed. It is considered that the resin composition that constitutes the gate insulating film 4 is deteriorated due to the influence of heat and plasma generated on the substrate, and the insulating property of the gate insulating film 4 is thereby lowered.
Further, Comparative Examples 4 to 4 in which the gate insulating film 4 is formed using a resin composition not containing the epoxy-based crosslinking agent (B) and the semiconductor layer 5 is formed of an a-Si layer (amorphous silicon layer). In No. 6, the obtained thin film transistor had low mobility and inferior on / off ratio and leakage current.

DESCRIPTION OF SYMBOLS 1, 1a ... Thin-film transistor 2 ... Substrate 3 ... Gate electrode 4 ... Gate insulating film 5 ... Semiconductor layer 6 ... Source electrode 7 ... Drain electrode

Claims

A thin film transistor comprising a gate insulating film and a semiconductor layer formed on the gate insulating film,
The semiconductor layer is composed of a sputtered film made of an amorphous oxide semiconductor containing at least one element of In, Ga, and Zn;
A resin in which the gate insulating film contains a cyclic olefin polymer (A) having a protic polar group and an epoxy-based crosslinking agent (B) having two or more epoxy groups in the molecule that react with the protic polar group. A thin film transistor comprising a composition.
The content of the epoxy crosslinking agent (B) in the resin composition is 10 to 100 parts by weight with respect to 100 parts by weight of the cyclic olefin polymer (A). A thin film transistor according to 1.
The thin film transistor according to claim 1 or 2, wherein the resin composition contains two or more different compounds as the epoxy-based crosslinking agent (B).
The resin composition contains, as the epoxy crosslinking agent (B), a compound having a molecular weight (Mw) of less than 1,000 and a compound having a molecular weight (Mw) of 1,000 or more. Item 4. The thin film transistor according to Item 3.
The thin film transistor according to claim 3 or 4, wherein the resin composition contains, as the epoxy-based crosslinking agent (B), a compound having a terminal epoxy group and a compound having an alicyclic epoxy group. .
6. The thin film transistor according to claim 1, wherein the resin composition further contains a melamine-based crosslinking agent (C).
The content of the melamine crosslinking agent (C) in the resin composition is 10 to 50 parts by weight with respect to 100 parts by weight of the cyclic olefin polymer (A). A thin film transistor according to 1.