WO2010001758A1 - 有機薄膜トランジスタ及びその製造方法、並びにこの有機トランジスタを用いたディスプレイ用部材及びディスプレイ - Google Patents
有機薄膜トランジスタ及びその製造方法、並びにこの有機トランジスタを用いたディスプレイ用部材及びディスプレイ Download PDFInfo
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- WO2010001758A1 WO2010001758A1 PCT/JP2009/061327 JP2009061327W WO2010001758A1 WO 2010001758 A1 WO2010001758 A1 WO 2010001758A1 JP 2009061327 W JP2009061327 W JP 2009061327W WO 2010001758 A1 WO2010001758 A1 WO 2010001758A1
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- insulating layer
- compound
- film transistor
- thin film
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- 150000002978 peroxides Chemical class 0.000 description 1
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- 229910052697 platinum Inorganic materials 0.000 description 1
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- 125000003944 tolyl group Chemical group 0.000 description 1
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- ZOYFEXPFPVDYIS-UHFFFAOYSA-N trichloro(ethyl)silane Chemical compound CC[Si](Cl)(Cl)Cl ZOYFEXPFPVDYIS-UHFFFAOYSA-N 0.000 description 1
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- 125000004205 trifluoroethyl group Chemical group [H]C([H])(*)C(F)(F)F 0.000 description 1
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- 125000005023 xylyl group Chemical group 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having potential barriers
- H10K10/40—Organic transistors
- H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
- H10K10/462—Insulated gate field-effect transistors [IGFETs]
- H10K10/468—Insulated gate field-effect transistors [IGFETs] characterised by the gate dielectrics
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having potential barriers
- H10K10/40—Organic transistors
- H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
- H10K10/462—Insulated gate field-effect transistors [IGFETs]
- H10K10/464—Lateral top-gate IGFETs comprising only a single gate
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having potential barriers
- H10K10/40—Organic transistors
- H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
- H10K10/462—Insulated gate field-effect transistors [IGFETs]
- H10K10/466—Lateral bottom-gate IGFETs comprising only a single gate
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having potential barriers
- H10K10/40—Organic transistors
- H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
- H10K10/462—Insulated gate field-effect transistors [IGFETs]
- H10K10/468—Insulated gate field-effect transistors [IGFETs] characterised by the gate dielectrics
- H10K10/471—Insulated gate field-effect transistors [IGFETs] characterised by the gate dielectrics the gate dielectric comprising only organic materials
Definitions
- the present invention relates to an organic thin film transistor and a method for manufacturing the same, and a display member and a display using the organic transistor.
- Plastic substrates such as polycarbonate and polyethylene terephthalate have been studied as substrates for flexible display devices such as electronic paper.
- these plastic substrates have a problem that they are slightly expanded and contracted when heated, improvement in heat resistance is required.
- an organic thin film transistor has attracted attention because it is thin and excellent in flexibility. Since the plastic substrate has not had sufficient heat resistance as described above, it is desirable that the process for producing the organic thin film transistor on the substrate can be performed at the lowest possible temperature.
- a high temperature is generally required for a process of forming and curing a gate insulating film that is an insulating layer provided between a gate electrode and an organic semiconductor layer. Therefore, it is important to lower the temperature of the formation process of the gate insulating film in order to lower the temperature of the manufacturing process of the organic thin film transistor.
- Patent Document 1 As a method of forming the gate insulating film at a low temperature, a method of anodizing the surface of the gate electrode (see Patent Document 1), a method of forming a film by chemical vapor deposition (see Patent Document 2), and the like are known. Yes. However, in these methods, the process of forming the gate insulating film is complicated.
- Non-Patent Document 1 shows that a gate insulating film is formed by spin coating poly (4-vinylphenol) or poly (melamine-formaldehyde) and curing at 200 ° C.
- Non-Patent Document 1 In the case of the method disclosed in Non-Patent Document 1 described above, it was necessary to cure the material at a high temperature in order to form the gate insulating film. However, at such a temperature required for curing, there are many cases where expansion and contraction due to heat of the plastic substrate cannot be sufficiently suppressed. For example, when producing a display device having fine pixels, the influence cannot be ignored. Therefore, in recent years, it has been required that the gate insulating film can be formed at a lower temperature.
- the present invention has been made in view of such circumstances, and an object thereof is to provide an organic thin film transistor capable of forming a gate insulating film at a low temperature and a method for manufacturing the same. Another object of the present invention is to provide a display member and a display using such an organic thin film transistor.
- an organic thin film transistor of the present invention includes a source electrode, a drain electrode, an organic semiconductor layer serving as a current path between them, a gate electrode for controlling a current passing through the current path, and an organic semiconductor layer. And an insulating layer that insulates the gate electrode, and the insulating layer generates a functional group (hereinafter referred to as “reactive functional group”) that reacts with an active hydrogen group in the molecule by electromagnetic radiation or heat.
- dissociable group a functional group having two or more active hydrogen groups in the molecule, and at least one of the first and second compounds. It consists of the hardened
- the insulating layer is formed from a cured product of the above composition.
- a reactive functional group is generated from the dissociable group by applying electromagnetic radiation or heat to the first compound, and then the reactive functional group and the active hydrogen group in the second compound are combined. A reaction occurs and curing proceeds.
- the first compound can easily generate a reactive functional group by electromagnetic radiation or heat, and the reactive functional group generated thereby easily reacts with the active hydrogen group of the second compound. Can do. Therefore, curing of the above-described composition may be performed by irradiation with electromagnetic radiation or heating at a relatively low temperature, and a conventional high temperature is not required. Therefore, the organic thin film transistor of the present invention can form an insulating layer (gate insulating film) satisfactorily even at a low temperature.
- an insulating layer made of a cured product of the above composition can be formed not only at a low temperature, but also generates little leakage current, hardly breaks down even when a high voltage is applied, Excellent characteristics can be exhibited when the gate insulating film of an organic thin film transistor is used, such as a history of changes in current (hysteresis) with respect to changes. Therefore, the organic thin film transistor of the present invention having such an insulating layer can exhibit excellent transistor characteristics and can have high durability and reliability.
- the group that generates a functional group that reacts with an active hydrogen group by electromagnetic radiation or heat is preferably a blocked isocyanato group or a blocked isothiocyanato group. Since these groups can easily generate an isocyanato group or an isothiocyanate group which is a reactive functional group by applying electromagnetic radiation or heat, an insulating layer can be formed at a lower temperature.
- a blocked isocyanato group or a blocked isothiocyanato group a group represented by the following general formula (1a) or a group represented by the following general formula (1b) is preferable.
- X 1 and X 2 each independently represent an oxygen atom or a sulfur atom
- R 11 , R 12 , R 13 , R 14 and R 15 each independently represent a hydrogen atom or a carbon number of 1 to 20 Represents a monovalent organic group.
- the first compound described above is at least one selected from the group consisting of a structural unit represented by the following general formula (2a) and a structural unit represented by the following general formula (2b). At least 1 selected from the group consisting of a structural unit, a structural unit represented by the following general formula (2c), a structural unit represented by the following general formula (2d), and a structural unit represented by the following general formula (2e)
- a polymer compound having a seed structural unit is preferred.
- X 21 and X 22 each independently represent an oxygen atom or a sulfur atom
- R 201 , R 202 , R 203 , R 204 , R 205 , R 206 , R 207 , R 208 , R 209 , R 209 210 , R 211 , R 212 , R 213 , R 214 , R 215 , R 216 , R 217 and R 218 each independently represent a hydrogen atom or a monovalent organic group having 1 to 20 carbon atoms
- R A , R B , R C , R D and R E each independently represent a divalent organic group having 1 to 20 carbon atoms
- q, r, s, t and u are each independently an integer of 0 to 20 is there.
- the present invention also provides a method for producing the organic thin film transistor of the present invention having the above-described configuration. That is, the organic thin film transistor manufacturing method of the present invention includes a source electrode, a drain electrode, an organic semiconductor layer serving as a current path between them, a gate electrode for controlling a current passing through the current path, an organic semiconductor layer, and a gate.
- a method for producing an organic thin film transistor comprising an insulating layer that insulates an electrode, wherein a functional group that reacts with an active hydrogen group by electromagnetic radiation or heat is formed in a molecule on a surface on which the insulating layer is formed.
- a composition comprising a first compound having two or more groups to be generated and a second compound having two or more active hydrogen groups in the molecule, wherein at least one of the first and second compounds is a polymer compound It is characterized by being formed by applying and curing an object.
- the insulating layer is formed by applying the above composition and then curing, so that the insulating layer can be easily formed at a low temperature. It becomes possible.
- the present invention further provides a display member using the organic thin film transistor of the present invention, and a display including the display member. Since these display members and displays use the organic thin film transistor of the present invention that can be formed at a low temperature, deformation of the plastic substrate is extremely suppressed, and for example, it has fine pixels. It is easy to make a simple display or the like.
- the present invention it is possible to provide an organic thin film transistor capable of forming a gate insulating film at a low temperature and a method for manufacturing the same.
- the organic thin film transistor thus obtained has an excellent threshold voltage, ON / OFF ratio, and hysteresis.
- FIG. 1 is a diagram schematically showing a cross-sectional configuration of an organic thin film transistor (hereinafter simply referred to as “transistor”) according to the first embodiment
- FIG. 2 is a schematic cross-sectional configuration of the transistor according to the second embodiment.
- the transistor of the first embodiment shown in FIG. 1 is a so-called top-gate type transistor
- the transistor of the second embodiment shown in FIG. 2 is a so-called bottom-gate type transistor. It is not limited to these forms.
- the transistor 100 includes a source electrode 12, a drain electrode 14, an organic semiconductor layer 16, a gate insulating layer (insulating layer) 18, and a gate electrode 19 in this order on a substrate 10. Is provided.
- the source electrode 12 and the drain electrode 14 are provided on the substrate 10 with a predetermined interval.
- the organic semiconductor layer 16 is formed on the substrate 10 so as to cover at least a part of the source electrode 12 and the drain electrode 14.
- the organic semiconductor layer 16 is in contact with both the source electrode 12 and the drain electrode 14 as described above, thereby forming a current path between these electrodes.
- the gate insulating layer 18 is provided so as to cover all of the source electrode 12, the drain electrode 14, and the organic semiconductor layer 16 formed in the lower part. Further, the gate electrode 19 is provided on the gate insulating layer 18. Thus, the gate insulating layer 18 is formed between the organic semiconductor layer 16 and the gate electrode 19, whereby the organic semiconductor layer 16 and the gate electrode 19 are insulated.
- the transistor 200 of the second embodiment includes a gate electrode 29, a gate insulating layer 28, a source electrode 22 and a drain electrode 24, an organic semiconductor layer 26, and a topcoat 30 on a substrate 20. They are provided in this order.
- the gate electrode 29 is provided directly on the substrate 20, and a gate insulating layer 28 is formed so as to cover the gate electrode 29.
- the source electrode 22 and the drain electrode 24 are provided at a predetermined interval.
- the organic semiconductor layer 26 is provided on the gate insulating layer 28 so as to cover at least part of the source electrode 22 and the drain electrode 24.
- the organic semiconductor layer 26 is in contact with both the source electrode 22 and the drain electrode 24 as described above, thereby forming a current path between these electrodes.
- the organic semiconductor layer 26 and the gate electrode 29 are insulated by forming a gate insulating layer 28 therebetween.
- the topcoat 30 is provided on the board
- the substrates 10 and 20 are formed of a known substrate such as a glass substrate or a plastic substrate.
- a plastic substrate that normally tends to expand and contract due to heat as the substrates 10 and 20. is there.
- the transistors 100 and 200 can be easily reduced in weight and flexibility.
- the gate electrodes 19 and 29 are made of a conductive material.
- Conductive materials include metals such as aluminum, gold, platinum, silver, copper, chromium, nickel and titanium, conductive oxides such as ITO, and a mixture of poly (3,4-ethylenedioxythiophene) and polystyrenesulfonic acid. Examples thereof include conductive polymers such as polymers. Further, a conductive material in which metal fine particles, carbon black, and graphite fine powder are dispersed in a binder can also be applied.
- the source electrodes 12 and 22 and the drain electrodes 14 and 24 may be made of the same conductive material as the gate electrodes 19 and 29.
- organic semiconductor layers 16 and 26 those made of a low molecular organic semiconductor material or a high molecular organic semiconductor material can be applied.
- low molecular organic semiconductor material include pentacene.
- polymer organic semiconductor material include poly-3-hexylthiophene (P3HT) and fluorenedinthiophene (F8T2).
- the organic semiconductor layers 16 and 26 are made of an organic material that can function as a semiconductor.
- the gate insulating layers 18 and 28 (insulating layers) in the transistors 100 and 200 have 2 groups (dissociable groups) that generate functional groups (reactive functional groups) that react with active hydrogen groups in the molecule by electromagnetic radiation or heat.
- a cured product of a composition comprising a first compound having at least one and a second compound having at least two active hydrogen groups in the molecule, wherein at least one of the first and second compounds is a polymer compound It is composed.
- insulating composition the composition constituting the gate insulating layers 18 and 28 (hereinafter referred to as “insulating composition”) and the cured product thereof will be described in detail.
- the first compound and the second compound is a polymer compound. That is, as a combination of the insulating compositions, when both the first and second compounds are polymer compounds, one of the first and second compounds is a polymer compound, and the other is low. The case where it is a molecular compound is mentioned.
- the “polymer compound” refers to a compound containing a structure in which a plurality of the same structural units are repeated in the molecule, and includes a so-called dimer.
- the “low molecular compound” means a compound that does not have the same structural unit repeatedly in the molecule.
- examples of the dissociable group include a blocked isocyanato group (hereinafter referred to as “block isocyanato group”), a blocked isothiocyanato group (hereinafter referred to as “block isothiocyanato group”), and the like. Can be mentioned.
- block isocyanato group a blocked isocyanato group
- block isothiocyanato group a blocked isothiocyanato group
- a block isocyanato group or a block isothiocyanato group is preferable.
- the block isocyanato group or the block isothiocyanato group generates an isocyanato group or an isothiocyanato group, which is a reactive functional group, by heat.
- the blocked isocyanato group or blocked isothiocyanato group is an isocyanato group or isothiocyanato group blocked by a blocking agent.
- the blocking agent is a compound that can react with an isocyanato group or an isothiocyanato group to form a group that protects them, and examples thereof include a compound having one active hydrogen group that can react with an isocyanato group or an isothiocyanato group.
- the blocking agent is preferably one that can be dissociated (deblocked) by applying a temperature of 170 ° C. or lower after blocking, and can generate an isocyanato group or an isothiocyanato group again.
- blocking agents examples include alcohols, phenols, active methylenes, mercaptans, acid amides, acid imides, imidazoles, ureas, oximes, amines, and imides. , Pyridine compounds, pyrazole compounds and the like. These blocking agents can be used alone or in combination of two or more. Of these, oxime compounds or pyrazole compounds are preferred.
- examples of the blocking agent include methanol, ethanol, propanol, butanol, 2-ethylhexanol, methyl cellosolve, butyl cellosolve, methyl carbitol, benzyl alcohol, cyclohexanol and the like as alcohol compounds.
- examples of phenolic compounds include phenol, cresol, ethylphenol, butylphenol, nonylphenol, dinonylphenol, styrenated phenol, hydroxybenzoic acid ester, and the like.
- Examples of the active methylene compound include dimethyl malonate, diethyl malonate, methyl acetoacetate, ethyl acetoacetate, and acetylacetone, and examples of the mercaptan compound include butyl mercaptan and dodecyl mercaptan.
- Examples of the acid amide compound as a blocking agent include acetanilide, acetic acid amide, ⁇ -caprolactam, ⁇ -valerolactam, ⁇ -butyrolactam, and the like.
- Examples of the acid imide compounds include succinimide and maleic imide.
- Etc Examples of the imidazole compound include imidazole and 2-methylimidazole, and examples of the urea compound include urea, thiourea, and ethylene urea.
- Examples of the amine compound include diphenylamine, aniline, and carbazole.
- Examples of the imine compound include ethyleneimine and polyethyleneimine.
- Examples of the bisulfite include sodium bisulfite
- examples of the pyridine compound include 2-hydroxypyridine and 2-hydroxyquinoline.
- examples of the oxime compound include formaldoxime, acetoaldoxime, acetoxime, methyl ethyl ketoxime, cyclohexanone oxime, and the like.
- examples of the pyrazole compound include 3,5-dimethylpyrazole, 3,5-diethylpyrazole, and the like. Can be mentioned.
- examples of the blocking agent that deblocks upon irradiation with electromagnetic radiation include ortho-nitrobenzyl group, ⁇ , ⁇ -dimethyl-3,5-dimethoxybenzyl group, and the like.
- a group represented by the following general formula (1a) or (1b) is preferable.
- X 1 and X 2 each independently represent an oxygen atom or a sulfur atom
- R 11 , R 12 , R 13 , R 14 and R 15 each independently represent a hydrogen atom or a carbon number of 1 to 20 Represents a monovalent organic group.
- the monovalent organic group having 1 to 20 carbon atoms as the group represented by R 11 to R 15 is any of linear, branched or cyclic Or a saturated group or an unsaturated group.
- Examples of the monovalent organic group having 1 to 20 carbon atoms include, for example, a linear hydrocarbon group having 1 to 20 carbon atoms, a branched hydrocarbon group having 3 to 20 carbon atoms, and a cyclic carbon group having 3 to 20 carbon atoms.
- Examples thereof include a hydrogen group and an aromatic hydrocarbon group having 6 to 20 carbon atoms.
- it is a linear hydrocarbon group having 1 to 6 carbon atoms, a branched hydrocarbon group having 3 to 6 carbon atoms, a cyclic hydrocarbon group having 3 to 6 carbon atoms, or an aromatic hydrocarbon group having 6 to 20 carbon atoms. It is.
- linear hydrocarbon groups having 1 to 20 carbon atoms branched hydrocarbon groups having 3 to 20 carbon atoms, and cyclic hydrocarbon groups having 3 to 20 carbon atoms
- some hydrogen atoms are fluorine atoms. It may be substituted.
- aromatic hydrocarbon group having 6 to 20 carbon atoms may be substituted with an alkyl group, a halogen atom or the like.
- Examples of the monovalent organic group having 1 to 20 carbon atoms include methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, isopropyl group, isobutyl group, tertiary butyl group, cyclopropyl group, cyclobutyl group, Cyclopentyl group, cyclohexyl group, cyclopentynyl group, cyclohexylinyl group, trifluoromethyl group, trifluoroethyl group, phenyl group, naphthyl group, anthryl group, tolyl group, xylyl group, dimethylphenyl group, trimethylphenyl group, ethylphenyl Group, diethylphenyl group, triethylphenyl group, propylphenyl group, butylphenyl group, methylnaphthyl group, dimethylnaphthy
- Examples of the block isocyanate group as described above include an O- (methylideneamino) carboxyamino group, an O- (1-ethylideneamino) carboxyamino group, an O- (1-methylethylideneamino) carboxyamino group, an O- [1- Methylpropylideneamino] carboxyamino group, 1- (3,5-dimethylpyrazolyl) carbonylamino group, 1- (3-ethyl-5-methylpyrazolyl) carbonylamino group, 1- (3,5-diethylpyrazolyl) carbonyl Examples thereof include an amino group, 1- (3-propyl-5-methylpyrazolyl) carbonylamino group, and 1- (3-ethyl-5-propylpyrazolyl) carbonylamino group.
- the block isothiocyanato group includes an O- (methylideneamino) thiocarboxyamino group, an O- (1-ethylideneamino) thiocarboxyamino group, an O- (1-methylethylideneamino) thiocarboxyamino group, an O- [ 1-methylpropylideneamino] thiocarboxyamino group, 1- (3,5-dimethylpyrazolyl) thiocarbonylamino group, 1- (3-ethyl-5-methylpyrazolyl) thiocarbonylamino group, 1- (3,5 -Diethylpyrazolyl) thiocarbonylamino group, 1- (3-propyl-5-methylpyrazolyl) thiocarbonylamino group, 1- (3-ethyl-5-propylpyrazolyl) thiocarbonylamino group and the like.
- the first compound is a high molecular compound or a low molecular compound having two or more dissociable groups described above.
- the first compound is a polymer compound
- the dissociable group may be directly bonded to the main chain constituting the polymer compound or may be bonded via a predetermined group. Further, the dissociable group may be contained in the structural unit constituting the polymer compound, but in that case, it may be contained in each structural unit, or may be contained only in a part of the structural units. Good. From the viewpoint of appropriately curing the insulating composition and imparting good flexibility to the gate insulating layers 18 and 28, it is preferable that the dissociable group is contained only in a part of the structural units. Furthermore, the dissociable group may be bonded only to the terminal of the polymer compound.
- the first compound composed of a polymer compound is, for example, a monomer compound (monomer) having a dissociable group and an unsaturated bond (for example, a double bond) in the molecule alone or other copolymer. It can be obtained by copolymerizing with a polymerizable compound (copolymerization monomer) to form a polymer.
- the first compound is a monomer having a reactive functional group instead of a dissociable group as the above-mentioned monomer, polymerized to form a polymer, and then the reactive functional group in the obtained polymer. It can also be obtained by changing the group to a dissociable group.
- a photopolymerization initiator or a thermal polymerization initiator may be applied.
- the first compound when the dissociable group is a block isocyanato group or a block isothiocyanato group, the first compound can be obtained as follows. That is, first, after obtaining a polymer by polymerizing an isocyanato group or a monomer having an isothiocyanato group and an unsaturated bond in the molecule alone or together with other copolymerization monomers, the block isocyanato group or the block isothiocyanato A 1st compound can be obtained by making group react with the blocking agent mentioned above and converting into a block isocyanato group or a block isothiocyanato group.
- Monomers having isocyanato group or isothiocyanato group and unsaturated bond in the molecule include 2-acryloyloxyethyl isocyanate, 2-methacryloyloxyethyl isocyanate, 2- (2′-methacryloyloxyethyl) oxyethyl isocyanate, 2-acryloyl Examples thereof include oxyethyl isothiocyanate, 2-methacryloyloxyethyl isothiocyanate, and 2- (2′-methacryloyloxyethyl) oxyethyl isothiocyanate.
- a monomer having a block isocyanato group or a block isothiocyanato group and an unsaturated bond in the molecule alone or together with other copolymerization monomers to obtain a polymer A compound can be obtained.
- monomers having a block isocyanato group and an unsaturated bond in the molecule include 2- [O- [1′-methylpropylideneamino] carboxyamino] ethyl-methacrylate, 2- [N- [1 ′, 3'-dimethylpyrazolyl] carboxyamino] ethyl-methacrylate and the like.
- Examples of the photopolymerization initiator used in the polymerization reaction include acetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxyacetophenone, 4-isopropyl-2-hydroxy-2-methylpropiophenone, 2 -Hydroxy-2-methylpropiophenone, 4,4'-bis (diethylamino) benzophenone, benzophenone, methyl (o-benzoyl) benzoate, 1-phenyl-1,2-propanedione-2- (o-ethoxycarbonyl) Oxime, 1-phenyl-1,2-propanedione-2- (o-benzoyl) oxime, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, benzoin octyl ether, benzyl, Carbonyl compounds such as benzyl dimethyl ketal,
- the thermal polymerization initiator can function as an initiator for radical polymerization.
- ketone peroxides such as methyl ethyl ketone peroxide, methyl isobutyl ketone peroxide, cyclohexanone peroxide, acetylacetone peroxide, isobutyl peroxide, benzoyl peroxide, 2,4-dichlorobenzoyl peroxide, o-methylbenzoyl peroxide , Lauroyl peroxide, p-chloro Diacyl peroxides such as benzoyl peroxide, hydroperoxides such as 2,4,4-trimethylpentyl-2-hydroperoxide, diisopropylbenzene peroxide, cumene hydroperoxide, t-butyl peroxide, dicumyl peroxide Dialkyl peroxides such as oxide, t-butylcumyl peroxide, di-t-butyl peroxide, tris (t-butylperoxy) triazine, 1,1-
- Examples of the copolymerization monomer copolymerized with the monomer having a dissociable group or reactive functional group described above include (meth) acrylic acid ester and derivatives thereof, styrene and derivatives thereof, vinyl acetate and derivatives thereof, and (meth) acrylonitrile.
- (meth) acryl is a generic name for acryl and methacryl, and indicates either or both of them.
- monofunctional (meth) acrylates and polyfunctional (meth) acrylates can be applied as (meth) acrylic acid esters and derivatives thereof.
- usage-amount of polyfunctional (meth) acrylate may be restrict
- (meth) acrylic acid esters and derivatives thereof include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, (meth) acrylic acid-n-propyl, isopropyl (meth) acrylate, and (meth) acrylic.
- styrene and derivatives thereof include styrene, 2,4-dimethyl- ⁇ -methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, 2,4-dimethylstyrene, and 2,5-dimethylstyrene.
- (Meth) acrylonitrile and its derivatives include acrylonitrile, methacrylonitrile and the like.
- vinyl esters of organic carboxylic acids and derivatives thereof include vinyl acetate, vinyl propionate, vinyl butyrate, vinyl benzoate, and divinyl adipate.
- allyl esters of organic carboxylic acids and derivatives thereof include allyl acetate, allyl benzoate, diallyl adipate, diallyl terephthalate, diallyl isophthalate, and diallyl phthalate.
- Dialkyl esters of fumaric acid and derivatives thereof include dimethyl fumarate, diethyl fumarate, diisopropyl fumarate, di-sec-butyl fumarate, diisobutyl fumarate, di-n-butyl fumarate, di-2-ethylhexyl fumarate And dibenzyl fumarate.
- Dialkyl esters of maleic acid and derivatives thereof include dimethyl maleate, diethyl maleate, diisopropyl maleate, di-sec-butyl maleate, diisobutyl maleate, di-n-butyl maleate, di-2-ethylhexyl maleate And dibenzyl maleate.
- Dialkyl esters of itaconic acid and its derivatives include dimethyl itaconate, diethyl itaconate, diisopropyl itaconate, di-sec-butyl itaconate, diisobutyl itaconate, di-n-butyl itaconate, di-2-ethylhexyl itaconate And dibenzyl itaconate.
- N-vinylamide derivatives of organic carboxylic acids include N-methyl-N-vinylacetamide.
- maleimide and derivatives thereof include N-phenylmaleimide and N-cyclohexylmaleimide.
- terminal unsaturated hydrocarbons and derivatives thereof examples include 1-butene, 1-pentene, 1-hexene, 1-octene, vinylcyclohexane, vinyl chloride, and allyl alcohol.
- organic germanium derivative examples include allyltrimethylgermanium, allyltriethylgermanium, allyltributylgermanium, trimethylvinylgermanium, triethylvinylgermanium, and the like.
- copolymer monomers (meth) acrylic acid alkyl ester, styrene, (meth) acrylonitrile or allyltrimethylgermanium are preferable, and these may be used in appropriate combination.
- the first compound is formed by copolymerizing a copolymerizable monomer with a monomer having a dissociable group or reactive functional group
- the monomer having a dissociable group or reactive functional group is a monomer subjected to polymerization. Is preferably 5 mol% or more and 60 mol% or less, and more preferably 10 mol% or more and 50 mol% or less.
- a polymer compound having a seed structural unit is preferable.
- X 21 and X 22 each independently represent an oxygen atom or a sulfur atom
- R 201 , R 202 , R 203 , R 204 , R 205 , R 206 , R 207 , R 208 , R 209 , R 209 210 , R 211 , R 212 , R 213 , R 214 , R 215 , R 216 , R 217 and R 218 each independently represent a hydrogen atom or a monovalent organic group having 1 to 20 carbon atoms
- R A , R B , R C , R D and R E each independently represent a divalent organic group having 1 to 20 carbon atoms
- q, r, s, t and u are each independently an integer of 0 to 20 is there.
- the polymer compound includes a plurality of structural units represented by the general formula (2a) and the structural unit represented by the general formula (2b), a structural unit represented by the general formula (2c), The structural unit represented by the general formula (2d) and the structural unit represented by the general formula (2e) may be used in combination.
- the above-mentioned block isocyanato group or block isothiocyanato represented by the general formula (1a) or (1b) examples thereof include those similar to the organic group having 1 to 20 carbon atoms represented by the group.
- the divalent organic group having 1 to 20 carbon atoms a divalent group in which one of the hydrogen atoms of the monovalent organic group is a bond with another structure. Is mentioned.
- the first compound is more specifically poly (styrene-co- [2- [O- (1′-methylpropylideneamino) carboxyamino] ethyl). -Methacrylate]), poly (styrene-co- [2- [1 '-(3', 5'-dimethylpyrazolyl) carbonylamino] ethyl-methacrylate]), poly (styrene-co-acrylonitrile-co- [2- [O- (1′-methylpropylideneamino) carboxyamino] ethyl-methacrylate]), poly (styrene-co-acrylonitrile-co- [2- [1 ′-(3 ′, 5′-dimethylpyrazolyl) carbonylamino ] Ethyl-methacrylate]), poly (styrene-co-acrylonitrile-co- [2- [1 ′-(3 ′, 5′-dimethylpyrazolyl
- the first compound composed of the polymer compound as described above has a polystyrene-equivalent weight average molecular weight of preferably 3,000 to 1,000,000, and more preferably 5,000 to 500,000. By having such a weight average molecular weight, there is an advantage that an insulating layer with good flatness and uniformity can be formed.
- the first compound composed of a low molecular compound is a compound having a structure in which two or more dissociable groups are bonded to a low molecular (monomer) structure.
- a low molecular structure for example, an alkyl structure or a benzene ring which may have a substituent is suitable.
- the first compound is preferably a compound represented by the following general formula (3a) or a compound represented by the following general formula (3b). It is.
- X 31 and X 32 each independently represent an oxygen atom or a sulfur atom
- R 31 , R 32 , R 33 , R 34 , R 35 , R 36 and R 37 each independently represent a hydrogen atom or Represents a monovalent organic group having 1 to 20 carbon atoms
- R F and R G each independently represents a divalent organic group having 1 to 20 carbon atoms
- a and b are each independently an integer of 2 to 6
- c and d are each independently an integer of 0 to 20.
- Examples of the monovalent organic group or divalent organic group having 1 to 20 carbon atoms in the general formula (3a) or (3b) include the same groups as those described above.
- Such a first compound is prepared by reacting, for example, the above-described blocking agent with a low molecular weight compound having two or more isocyanato groups or isothiocyanato groups, thereby changing the isocyanato group or isothiocyanato group which is a reactive functional group.
- a low molecular weight compound having two or more isocyanato groups or isothiocyanato groups thereby changing the isocyanato group or isothiocyanato group which is a reactive functional group.
- an organic solvent, a catalyst, or the like may be appropriately added.
- Examples of the low molecular weight compound having two or more isocyanato groups or isothiocyanato groups include ortho-phenylene diisocyanate, meta-phenylane diisocyanate, para-phenylene diisocyanate, tolylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate and the like.
- the second compound is a high molecular compound or a low molecular compound having two or more active hydrogen groups in the molecule.
- the active hydrogen group include an amino group, a hydroxy group, and a mercapto group.
- generate reaction with the reactive functional group mentioned above favorably are suitable.
- the active hydrogen group may be directly bonded to the main chain constituting the polymer compound or may be bonded via a predetermined group. Further, the active hydrogen group may be contained in the structural unit constituting the polymer compound. In that case, it may be contained in each structural unit, or may be contained only in a part of the structural units. Good. Furthermore, the active hydrogen group may be bonded only to the terminal of the polymer compound.
- the second compound composed of a polymer compound is, for example, a monomer compound (monomer) having an active hydrogen group and an unsaturated bond (for example, a double bond) in the molecule, or a single compound or other common compound. It can be obtained by copolymerizing with a polymerizable compound to form a polymer. In the polymerization, a photopolymerization initiator or a thermal polymerization initiator may be applied. In addition, as a copolymerization monomer, a photoinitiator, and a thermal polymerization initiator, the same thing as the case where the 1st compound which consists of a high molecular compound mentioned above is formed is applicable.
- Examples of the monomer having an active hydrogen group and an unsaturated bond in the molecule include aminostyrene, hydroxystyrene, vinyl benzyl alcohol, aminoethyl methacrylate, ethylene glycol monovinyl ether, and the like.
- a novolak resin obtained by condensing a phenol compound and formaldehyde in the presence of an acid catalyst is also suitable.
- the polystyrene-equivalent weight average molecular weight is preferably 1,000 to 1,000,000, and more preferably 3,000 to 500,000. Thereby, the effect that the flatness and uniformity of the insulating layer are improved can be obtained.
- the second compound when the second compound is a low molecular compound, such a second compound is a compound having a structure in which two or more active hydrogen groups are bonded to a low molecular (monomer) structure.
- this low molecular structure include an alkyl structure and a benzene ring.
- the second compound include amine-based, alcohol-based, phenol-based, and thiol-based low molecular compounds.
- amine-based compounds include ethylenediamine, propylenediamine, hexamethylenediamine, N, N, N ′, N ′,-tetraaminoethylethylenediamine, ortho-phenylenediamine, meta-phenylenediamine, para-phenylenediamine, N , N′-diphenyl-para-phenylenediamine, melamine, 2,4,6-triaminopyrimidine, 1,5,9-triazacyclododecane and the like.
- Examples of alcohol compounds include ethylene glycol, 1,2-dihydroxypropane, glycerol, 1,4-dimethanolbenzene and the like.
- examples of phenolic compounds include 1,2-dihydroxybenzene, 1,3-dihydroxybenzene, 1,4-dihydroxybenzene, 1,2-dihydroxynaphthalene, resorcin, fluoroglycerol, 2,3,4-trihydroxybenzaldehyde 3,4,5-trihydroxybenzamide and the like.
- examples of the thiol-based compound include ethylene dithiol and para-phenylene dithiol.
- the gate insulating layers 18 and 28 in the transistors 100 and 200 of this embodiment are made of a cured product of an insulating composition containing a combination of the first compound and the second compound as described above.
- the cured product of the insulating composition forms a structure in which the first compound and the second compound are repeatedly bonded by a reaction that occurs between the first compound and the second compound. It is a thing of the state.
- a reactive functional group is formed from the dissociable group of the first compound by applying electromagnetic radiation or heat, and subsequently, The reactive functional group generated in the first compound is generated by reacting with the active hydrogen group of the second compound.
- the insulating composition can be cured by applying electromagnetic radiation or heat.
- An electromagnetic ray is an electromagnetic wave having a predetermined wavelength, and for example, X-rays, ultraviolet rays, and the like correspond to this.
- a substrate 10 is prepared, and the above-described conductive property is formed on the substrate 10 by a known method such as a vapor deposition method, a sputtering method, a printing method, or an inkjet method.
- the source electrode 12 and the drain electrode 14 are formed by depositing a conductive material.
- the organic semiconductor layer 16 is formed on the substrate 10 on which the source electrode 12 and the drain electrode 14 are formed so as to cover each of them.
- the organic semiconductor layer 16 is preferably formed, for example, by dissolving the above-described low-molecular or high-molecular organic semiconductor material in a solvent capable of dissolving them, and then applying the solution to a substrate and drying.
- the solvent used here may be any solvent that can dissolve the organic semiconductor material. From the viewpoint of removing by drying at the lowest possible temperature, a solvent having a boiling point of 50 ° C. to 200 ° C. at normal pressure is preferable.
- the solvent include organic solvents such as chloroform, toluene, anisole, 2-heptanone, and propylene glycol monomethyl ether acetate.
- the application of the organic semiconductor material solution can be performed by, for example, a spin coating method, a die coater method, a screen printing method, an ink jet method, or the like.
- an insulating layer 18 is formed on the substrate 10 on which the source electrode 12, the drain electrode 14, and the organic semiconductor layer 16 are formed so as to cover them.
- the insulating layer 18 can be formed by applying and curing the above-described insulating composition.
- the upper surface of the stacked structure in which the source electrode 12, the drain electrode 14, and the organic semiconductor layer 16 are formed on the substrate 10 corresponds to the “surface on which the insulating layer is formed”. .
- a detailed method for forming the insulating layer 18 will be described later.
- the gate electrode 19 is formed on the insulating layer 18 by the same method as the source electrode 12 and the drain electrode 14. Thereby, the transistor 100 of the first embodiment shown in FIG. 1 is obtained.
- the gate electrode 29 is formed on the substrate 20 in the same manner as in the first embodiment.
- a gate insulating layer 28 is formed on the substrate 20 so as to cover the gate electrode 29.
- the upper surface of the stacked structure in which the gate electrode 29 is formed on the substrate 20 corresponds to the “surface on which the insulating layer is formed”.
- the source electrode 22 and the drain electrode 24 are formed on the gate insulating layer 28, and further, the organic semiconductor layer 26 is formed so as to cover each part thereof. These can be performed in the same manner as in the first embodiment.
- a top coat 30 is formed so as to cover the gate electrode 29, the gate insulating layer 28, the source electrode 22, the drain electrode 24, and the organic semiconductor layer 26 thus formed on the substrate 20, so that FIG.
- the transistor 200 of the second embodiment shown is obtained.
- the topcoat 30 is made of, for example, a polymer having a fluorine atom in the molecule, and can be formed by a spin coat method, a dip coat method, a potting method, a spray method, or the like.
- the above-described insulating composition is applied onto the surface on which these gate insulating layers are formed.
- coating of an insulating composition can be performed in the state of the solution which melt
- the organic solvent used in this solution is one that can dissolve the components of the insulating composition. For example, those having a boiling point of 100 ° C. to 200 ° C. at normal pressure are preferable because they can be easily removed by drying. .
- Examples of such an organic solvent include 2-heptanone and propylene glycol monomethyl ether acetate.
- solution containing the insulating composition can be performed by a spin coating method, a die coater method, a screen printing method, an ink jet method, or the like.
- the solution of the insulating composition applied as described above is dried to remove the organic solvent, thereby forming a layer made of the insulating composition. Drying can be performed by heating to such an extent that the organic solvent volatilizes. At this time, it is desirable that the temperature is not excessively high from the viewpoint of forming the transistor at a low temperature.
- the gate insulating layers 18 and 28 can be formed by curing the layer made of the insulating composition.
- the curing can be performed by irradiation with electromagnetic radiation or heating.
- the first compound in the insulating composition has a block isocyanato group or a block isothiocyanate group as a dissociable group
- curing can be caused by heating.
- the heating temperature is preferably 60 to 250 ° C., more preferably 80 to 200 ° C.
- the heating temperature exceeds 250 ° C., for example, when a plastic substrate or the like is used, the expansion and contraction may not be sufficiently suppressed.
- the temperature is lower than 60 ° C., the insulating composition is not sufficiently cured, and the effects such as suppression of leakage current, improvement of withstand voltage, and stabilization of hysteresis may not be sufficiently obtained.
- a self-assembled monolayer may be formed on the gate insulating layers 18 and 28 (not shown). By forming such a self-assembled monolayer, it is possible to obtain effects such as further improvement of the withstand voltage and improvement of transistor characteristics.
- the self-assembled monolayer can be formed, for example, by treating the gate insulating layers 18 and 28 with an alkylchlorosilane compound or an alkylalkoxysilane compound.
- the self-assembled monolayer formed in this way has a structure in which an alkylchlorosilane compound or an alkylalkoxysilane compound has undergone hydrolysis / condensation, etc., and has ionic bonds, hydrogen bonds with the surfaces of the gate insulating layers 18 and 28. It is thought that it has the structure which interacted by coupling
- alkylchlorosilane compound or the alkylalkoxysilane compound for example, a solution in which these compounds are dissolved in an organic solvent so as to be 1 to 10% by weight is applied on the gate insulating layers 18 and 28 and dried. Etc. can be formed.
- alkylchlorosilane compound examples include methyltrichlorosilane, ethyltrichlorosilane, butyltrichlorosilane, decyltrichlorosilane, octadecyltrichlorosilane, and the like.
- alkylalkoxysilane compound examples include methyltrimethoxysilane, ethyltrimethoxysilane, butyltrimethoxysilane, decyltrimethoxysilane, and octadecyltrimethoxysilane.
- FIG. 3 is a diagram schematically showing a cross-sectional configuration of a display according to a preferred embodiment.
- the display 300 of this embodiment has a configuration including a transistor 200 and an organic EL element 40.
- the display 300 constitutes one pixel in the display, and a transistor 200 is connected to the organic EL element 40 to control light emission of the organic EL element 40.
- An actual display is capable of displaying an image by providing a large number of such displays 300.
- the transistor 200 has the same structure as the transistor 200 of the second embodiment described above.
- the substrate 20 in the transistor 200 extends in the surface direction, and also serves as a substrate on which the organic EL element 40 is mounted. Further, the topcoat 30 in the transistor 200 is arranged between the substrate 20 and the organic EL element 40.
- the organic EL element 40 one having a known structure can be applied.
- the transistor 200 which is an embodiment of the transistor of the present invention can be suitably used as a display member used in a display.
- the transistor 200 can form the gate insulating layer 28, which has conventionally been required to have a high temperature, at a low temperature.
- the transistor 200 can form the gate insulating layer 28, which has conventionally been required to have a high temperature, at a low temperature.
- the transistor 200 can form the gate insulating layer 28, which has conventionally been required to have a high temperature, at a low temperature.
- the transistor 200 can form the gate insulating layer 28, which has conventionally been required to have a high temperature, at a low temperature.
- the transistor 200 can form the gate insulating layer 28, which has conventionally been required to have a high temperature, at a low temperature.
- the transistor 200 can form the gate insulating layer 28, which has conventionally been required to have a high temperature, at a low temperature.
- the transistor 200 can form the gate insulating layer 28, which has conventionally been required to have a high temperature
- Example 1 (Preparation of insulating layer forming solution) A 10 ml sample bottle containing 1.00 g of a 2-heptanone solution of polymer compound 1 as the first compound, 0.017 g of hexamethylenediamine (manufactured by Wako Pure Chemical Industries) as the second compound, and 1.10 g of 2-heptanone. The solution was stirred and dissolved to prepare a uniform solution.
- the above-mentioned insulating layer forming solution is filtered using a 0.2 ⁇ m membrane filter, spin-coated on a glass substrate with a chromium electrode (gate electrode), and heated on a hot plate at 150 ° C. for 90 minutes. Thus, a gate insulating layer was obtained.
- chloroform as a solvent
- concentration was set to 0.00.
- a 5% by weight solution organic semiconductor composition
- the obtained coating solution was applied on the gate insulating layer by a spin coating method to form an organic semiconductor layer having a thickness of about 60 nm.
- a source electrode and a drain electrode having a channel length of 20 ⁇ m and a channel width of 2 mm (having a structure in which fullerene and gold are stacked in this order from the organic semiconductor layer side) on the organic semiconductor layer by vacuum deposition using a metal mask.
- a bottom gate type field effect organic thin film transistor was produced.
- the source-drain voltage Vsd is -50 V
- the gate voltage Vg of the threshold voltage Vth 1 with the gate voltage Vg at the time of changing from 0V to -60V from -60V when changing to 0V The absolute value of the voltage difference from the threshold voltage Vth 2 was obtained and used as hysteresis.
- Example 2 (Preparation of insulating layer forming solution) 10 ml of 1.00 g of 2-heptanone solution of polymer compound 1 as the first compound, 0.016 g of 1,4-phenylenediamine (manufactured by Wako Pure Chemical Industries) as the second compound, and 1.10 g of 2-heptanone The sample solution was stirred and dissolved to prepare a uniform solution.
- a transistor was produced in the same manner as in Example 1 except that the insulating layer forming solution of this example was used, and the transistor characteristics and hysteresis were measured in the same manner. The obtained results are shown in Table 1.
- Example 3 (Preparation of insulating layer forming solution) 10 ml of 2-heptanone solution 1.00 g of polymer compound 1 as the first compound, 0.015 g of 1,4-dihydroxybenzene (manufactured by Wako Pure Chemical Industries) as the second compound, and 1.10 g of 2-heptanone The sample solution was stirred and dissolved to prepare a uniform solution.
- a transistor was produced in the same manner as in Example 1 except that the insulating layer forming solution of this example was used, and the transistor characteristics and hysteresis were measured in the same manner. The obtained results are shown in Table 1.
- Example 4 (Preparation of insulating layer forming solution) 10 ml of 2-heptanone solution 1.00 g of polymer compound 2 as the first compound, 0.017 g of 1,4-phenylenediamine (manufactured by Wako Pure Chemical Industries) as the second compound, and 1.10 g of 2-heptanone The sample solution was stirred and dissolved to prepare a uniform solution.
- a transistor was produced in the same manner as in Example 1 except that the insulating layer forming solution of this example was used, and the transistor characteristics and hysteresis were measured in the same manner. The obtained results are shown in Table 1.
- Example 5 (Preparation of insulating layer forming solution) 1.00 g of 2-heptanone solution of polymer compound 3 obtained as the first compound, 0.019 g of 1,4-phenylenediamine (manufactured by Wako Pure Chemical Industries) as the second compound, and 1.10 g of 2-heptanone.
- a uniform coating solution was prepared by stirring and dissolving in a 10 ml sample bottle.
- a transistor was produced in the same manner as in Example 1 except that the insulating layer forming solution of this example was used, and the transistor characteristics and hysteresis were measured in the same manner. The obtained results are shown in Table 1.
- Example 6 (Preparation of insulating layer forming solution) 10 ml of 1.00 g of 2-heptanone solution of polymer compound 4 as the first compound, 0.015 g of 1,4-phenylenediamine (manufactured by Wako Pure Chemical Industries) as the second compound, and 2.00 g of 2-heptanone The sample solution was stirred and dissolved to prepare a uniform solution.
- a transistor was produced in the same manner as in Example 1 except that the insulating layer forming solution of this example was used, and the transistor characteristics and hysteresis were measured in the same manner. The obtained results are shown in Table 1.
- Example 7 (Preparation of insulating layer forming solution) 10 ml of 3.00 g of 2-heptanone solution of polymer compound 5 as the first compound, 0.041 g of 1,4-phenylenediamine (manufactured by Wako Pure Chemical Industries) as the second compound, and 3.00 g of 2-heptanone The sample solution was stirred and dissolved to prepare a uniform solution.
- a transistor was produced in the same manner as in Example 1 except that the insulating layer forming solution of this example was used, and the transistor characteristics and hysteresis were measured in the same manner. The obtained results are shown in Table 1.
- Example 9 (Preparation of insulating layer forming solution) A 10 ml sample bottle containing 0.45 g of 2-heptanone solution of polymer compound 1 as the first compound, 0.50 g of 2-heptanone solution of polymer compound 6 as the second compound, and 2.00 g of 2-heptanone. The solution was stirred and dissolved to prepare a uniform solution.
- Example 10 (Preparation of insulating layer forming solution) 0.081 g of 2-heptanone solution of polymer compound 1 as the first compound, 1.00 g of polyvinylphenol-co-polymethyl methacrylate (manufactured by Aldrich) as the second compound, and 7.00 g of propylene glycol monomethyl ether acetate A uniform solution was prepared by stirring and dissolving in a 10 ml sample bottle.
- Example 11 (Preparation of insulating layer forming solution) 10 ml of 3.00 g of 2-heptanone solution of polymer compound 7 as the first compound, 0.047 g of 1,4-phenylenediamine (manufactured by Wako Pure Chemical Industries) as the second compound, and 4.20 g of 2-heptanone A uniform solution was prepared by stirring and dissolving in a sample bottle.
- a transistor was produced in the same manner as in Example 1 except that the insulating layer forming solution of this example was used, and the transistor characteristics were measured in the same manner.
- the threshold voltage (Vth) was ⁇ 18.6 V
- the ON / OFF ratio was 6.3 ⁇ 10 ⁇ 5 .
- 1,3-di [O- (1-methyl) obtained in Synthesis Example 8 which is the first compound Ethylideneamino) carboxyamino] benzene (0.30 g) and 2-heptanone (8.70 g) were placed in a 10 ml sample bottle and dissolved by stirring to prepare a uniform
- a transistor was produced in the same manner as in Example 1 except that the insulating layer forming solution of this example was used, and the transistor characteristics and hysteresis were measured in the same manner. The obtained results are shown in Table 1.
- Example 15 (Preparation of insulating layer forming solution) 1.00 g of the second compound, polyvinylphenol-co-polymethyl methacrylate (Aldrich), 1,3-di [O- (1-methylethylideneamino) obtained in Synthesis Example 8 which is the first compound Carboxyamino] benzene (0.10 g) and 2-heptanone (7.40 g) were placed in a 10 ml sample bottle and dissolved by stirring to prepare a uniform solution.
- Aldrich polyvinylphenol-co-polymethyl methacrylate
- 1,3-di [O- (1-methylethylideneamino) obtained in Synthesis Example 8 which is the first compound Carboxyamino] benzene (0.10 g) and 2-heptanone (7.40 g) were placed in a 10 ml sample bottle and dissolved by stirring to prepare a uniform solution.
- Example 16 (Preparation of insulating layer forming solution) 1.00 g of the second compound, polyvinylphenol-co-polymethyl methacrylate (Aldrich), 1,3-di [O- (1-methylethylideneamino) obtained in Synthesis Example 8 which is the first compound Carboxyamino] benzene (0.20 g) and 2-heptanone (8.00 g) were placed in a 10 ml sample bottle and dissolved by stirring to prepare a uniform solution.
- Aldrich polyvinylphenol-co-polymethyl methacrylate
- 1,3-di [O- (1-methylethylideneamino) obtained in Synthesis Example 8 which is the first compound Carboxyamino] benzene (0.20 g) and 2-heptanone (8.00 g) were placed in a 10 ml sample bottle and dissolved by stirring to prepare a uniform solution.
- Example 17 (Preparation of insulating layer forming solution) 1.00 g of the second compound, polyvinylphenol-co-polymethyl methacrylate (Aldrich), 1,3-di [O- (1-methylethylideneamino) obtained in Synthesis Example 8 which is the first compound Carboxyamino] benzene (0.30 g) and 2-heptanone (8.70 g) were placed in a 10 ml sample bottle and dissolved by stirring to prepare a uniform solution.
- Aldrich polyvinylphenol-co-polymethyl methacrylate
- 1,3-di [O- (1-methylethylideneamino) obtained in Synthesis Example 8 which is the first compound Carboxyamino] benzene (0.30 g) and 2-heptanone (8.70 g) were placed in a 10 ml sample bottle and dissolved by stirring to prepare a uniform solution.
- a transistor was produced in the same manner as in Example 1 except that the insulating layer forming solution of this example was used, and the transistor characteristics and hysteresis were measured in the same manner. The obtained results are shown in Table 1.
- a transistor was produced in the same manner as in Example 1 except that the insulating layer forming solution of this comparative example was used, and the transistor characteristics and hysteresis were measured in the same manner. The obtained results are shown in Table 1.
- the insulating layer does not expand or contract the plastic substrate. It is confirmed that the insulating layer has excellent solvent resistance and withstand voltage, excellent transistor characteristics compared to the transistor of Comparative Example 1, and stable hysteresis. It was done.
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Abstract
Description
図1は、第1実施形態に係る有機薄膜トランジスタ(以下、単に「トランジスタ」と称する)の断面構成を模式的に示す図であり、図2は、第2実施形態に係るトランジスタの断面構成を模式的に示す図である。図1に示す第1実施形態のトランジスタは、いわゆるトップゲート型のトランジスタであり、図2に示す第2実施形態のトランジスタは、いわゆるボトムゲート型のトランジスタであるが、本発明のトランジスタは、必ずしもこれらの形態に限定されない。
次に、上述した構成を有する有機薄膜トランジスタの製造方法の好適な実施形態について説明する。
次に、本発明のトランジスタを用いたディスプレイ用部材及びディスプレイについて説明する。以下の説明では、ディスプレイとして、有機EL素子を用いたものの構造を例に挙げて説明するが、本発明に適用できるディスプレイはこれに限定されない。
(合成例1)
スチレン(和光純薬製)5.00g、アクリロニトリル(和光純薬製)1.27g、2-〔O-[1’-メチルプロピリデンアミノ]カルボキシアミノ〕エチル-メタクリレート(昭和電工製、商品名:カレンズMOI-BM)1.92g、1,1’-アゾビス(シクロヘキサンカルボニトリル)0.08g、2-ヘプタノン(和光純薬製)19.13gを、50ml耐圧容器(エース製)に入れ、窒素をバブリングした後、密栓し、60℃のオイルバス中で48時間重合させて、第1の化合物である高分子化合物1の粘稠な2-ヘプタノン溶液を得た。
スチレン(和光純薬製)1.00g、アクリロニトリル(和光純薬製)0.51g、2-〔O-[1’-メチルプロピリデンアミノ]カルボキシアミノ〕エチル-メタクリレート(昭和電工製、商品名:カレンズMOI-BM)0.51g、1,1’-アゾビス(シクロヘキサンカルボニトリル)0.02g、2-ヘプタノン(和光純薬製)18.20gを、50ml耐圧容器(エース製)に入れ、窒素をバブリングした後、密栓し、60℃のオイルバス中で48時間重合させて、第1の化合物である高分子化合物2の粘稠な2-ヘプタノン溶液を得た。
スチレン(和光純薬製)0.70g、アクリロニトリル(和光純薬製)0.71g、2-〔O-[1’-メチルプロピリデンアミノ]カルボキシアミノ〕エチル-メタクリレート(昭和電工製、商品名:カレンズMOI-BM)0.54g、1,1’-アゾビス(シクロヘキサンカルボニトリル)0.02g、2-ヘプタノン(和光純薬製)17.57gを、50mlの耐圧容器(エース製)に入れ、窒素をバブリングした後、密栓し、60℃のオイルバス中で48時間重合させて、第1の化合物である高分子化合物3の粘稠な2-ヘプタノン溶液を得た。
スチレン(和光純薬製)3.90g、2-〔O-[1’-メチルプロピリデンアミノ]カルボキシアミノ〕エチル-メタクリレート(昭和電工製、商品名:カレンズMOI-BM)1.00g、1,1’-アゾビス(シクロヘキサンカルボニトリル)0.05g、2-ヘプタノン(和光純薬製)11.43gを、50mlの耐圧容器(エース製)に入れ、窒素をバブリングした後、密栓し、60℃のオイルバス中で48時間重合させて、第1の化合物である高分子化合物4の粘稠な2-ヘプタノン溶液を得た。
スチレン(和光純薬製)4.00g、アクリロニトリル(和光純薬製)1.11g、2-〔O-[1’-メチルプロピリデンアミノ]カルボキシアミノ〕エチル-メタクリレート(昭和電工製、商品名:カレンズMOI-BM)1.68g、アリルトリメチルゲルマニウム(チッソ製)0.70g、1,1’-アゾビス(シクロヘキサンカルボニトリル)0.08g、2-ヘプタノン(和光純薬製)15.84gを、50mlの耐圧容器(エース製)に入れ、窒素をバブリングした後、密栓し、60℃のオイルバス中で48時間重合させて、第1の化合物である高分子化合物5の粘稠な2-ヘプタノン溶液を得た。
4-アミノスチレン(東京化成製)4.32g、1,1’-アゾビス(シクロヘキサンカルボニトリル)0.04g、2-ヘプタノン(和光純薬製)10.08gを、50mlの耐圧容器(エース製)に入れ、窒素をバブリングした後、密栓し、60℃のオイルバス中で48時間重合させて、第2の化合物である高分子化合物6の粘稠な2-ヘプタノン溶液を得た。
スチレン(和光純薬製)5.00g、アクリロニトリル(和光純薬製)1.27g、2-〔N-[1’,3’-ジメチルピラゾリル]カルボキシアミノ〕エチル-メタクリレート(昭和電工製、商品名:カレンズMOI-BP)2.01g、1,1’-アゾビス(シクロヘキサンカルボニトリル)(アルドリッチ製)0.08g、2-ヘプタノン(和光純薬製)19.33gを50mlの耐圧容器(エース製)に入れ、窒素をバブリングした後密栓し、60℃のオイルバス中で48時間重合させて、第1の化合物である高分子化合物7の粘稠な2-ヘプタノン溶液を得た。
50ml平衡型滴下ロート、三方コック、メカニカルスターラーを取り付けた500ml三つ口フラスコの内部を窒素置換した後、1,3-フェニレンジイソシアネート25.0g(和光純薬製)、脱水テトラヒドロフラン250mlを加え、これらを攪拌、溶解して1,3-フェニレンジイソシアネートのテトラヒドロフラン溶液を得た。反応フラスコを氷浴中に入れ、1,3-フェニレンジイソシアネートのテトラヒドロフラン溶液を200rpmで攪拌しながら、ブタノンケトオキシム(和光純薬製)をゆっくりと滴下した。
(絶縁層形成用溶液の調製)
第1の化合物である高分子化合物1の2-ヘプタノン溶液1.00g、第2の化合物であるヘキサメチレンジアミン(和光純薬製)0.017g、2-ヘプタノン1.10gを、10mlのサンプル瓶に入れ、攪拌溶解して均一な溶液を調製した。
得られた溶液を0.2μmのメンブレンフィルターを用いてろ過した後、シリコンウェハー上にスピンコートし、これをホットプレート上で150℃で30分間加熱して、絶縁層を得た。
得られた絶縁層にトルエン又はクロロホルムを滴下したところ、絶縁層は溶解しなかった。
絶縁層の一部を剥離して段差計(ケイエルエムテンコール製)で膜厚を測定したところ250nmであった。
上述した絶縁層形成用溶液を0.2μmのメンブレンフィルターを用いてろ過した後、クロム電極(ゲート電極)のついたガラス基板上にスピンコートし、これをホットプレート上で150℃で90分間加熱して、ゲート絶縁層を得た。
得られたトランジスタについて、ゲート電圧Vgを0~-60V、ソース・ドレイン間電圧Vsdを0~-60Vに変化させた条件で、そのトランジスタ特性を真空プロ-バ(BCT22MDC-5-HT-SCU;Nagase Electronic Equipments Service Co. LTD製)を用いて測定した。得られた結果を表1に示す。
(絶縁層形成用溶液の調製)
第1の化合物である高分子化合物1の2-ヘプタノン溶液1.00g、第2の化合物である1,4-フェニレンジアミン(和光純薬製)0.016g、2-ヘプタノン1.10gを、10mlのサンプル瓶に入れ、攪拌溶解して均一な溶液を調製した。
得られた溶液を、0.2μmのメンブレンフィルターを用いてろ過した後、シリコンウェハー上にスピンコートし、これをホットプレート上で150℃で30分間加熱して、絶縁層を得た。
得られた絶縁層にトルエン又はクロロホルムを滴下したところ、絶縁層は溶解しなかった。
絶縁層の一部を剥離して実施例1と同様に膜厚を測定したところ、250nmであった。この絶縁層を用い、実施例1と同様にして絶縁破壊電圧を測定したところ、100Vを印加しても絶縁破壊を起こさなかった。また、100Vを印加した時のリーク電流は、4.12×10-12A(電極面積=0.0314cm2)であった。
本実施例の絶縁層形成用溶液を用いたこと以外は、実施例1と同様にしてトランジスタを作製し、同様にトランジスタ特性及びヒステリシスを測定した。得られた結果を表1に示す。
(絶縁層形成用溶液の調製)
第1の化合物である高分子化合物1の2-ヘプタノン溶液1.00g、第2の化合物である1,4-ジヒドロキシベンゼン(和光純薬製)0.015g、2-ヘプタノン1.10gを、10mlのサンプル瓶に入れ、攪拌溶解して均一な溶液を調製した。
得られた溶液を0.2μmのメンブレンフィルターを用いてろ過した後、シリコンウェハー上にスピンコートし、これをホットプレート上で150℃で30分間加熱して、絶縁層を得た。
得られた絶縁層にトルエン又はクロロホルムを滴下したところ、絶縁層は溶解しなかった。
絶縁層の一部を剥離して実施例1と同様に膜厚を測定したところ、250nmであった。この絶縁層を用い、実施例1と同様にして絶縁破壊電圧を測定したところ、100Vを印加しても絶縁破壊を起こさなかった。また、100Vを印加した時のリーク電流は、1.60×10-11A(電極面積=0.0314cm2)であった。
本実施例の絶縁層形成用溶液を用いたこと以外は、実施例1と同様にしてトランジスタを作製し、同様にトランジスタ特性及びヒステリシスを測定した。得られた結果を表1に示す。
(絶縁層形成用溶液の調製)
第1の化合物である高分子化合物2の2-ヘプタノン溶液1.00g、第2の化合物である1,4-フェニレンジアミン(和光純薬製)0.017g、2-ヘプタノン1.10gを、10mlのサンプル瓶に入れ、攪拌溶解して均一な溶液を調製した。
得られた溶液を0.2μmのメンブレンフィルターを用いてろ過した後、シリコンウェハー上にスピンコートし、これをホットプレート上で150℃で30分間加熱して、絶縁層を得た。
得られた絶縁層にトルエン又はクロロホルムを滴下したところ、絶縁層は溶解しなかった。
絶縁層の一部を剥離して実施例1と同様に膜厚を測定したところ、380nmであった。この絶縁層を用い、実施例1と同様にして絶縁破壊電圧を測定したところ、100Vを印加しても絶縁破壊を起こさなかった。また、100Vを印加した時のリーク電流は、2.85×10-11A(電極面積=0.0314cm2)であった。
本実施例の絶縁層形成用溶液を用いたこと以外は、実施例1と同様にしてトランジスタを作製し、同様にトランジスタ特性及びヒステリシスを測定した。得られた結果を表1に示す。
(絶縁層形成用溶液の調製)
第1の化合物である得た高分子化合物3の2-ヘプタノン溶液1.00g、第2の化合物である1,4-フェニレンジアミン(和光純薬製)0.019g、2-ヘプタノン1.10gを、10mlのサンプル瓶に入れ、攪拌溶解して均一な塗布溶液を調製した。
得られた溶液を、0.2μmのメンブレンフィルターを用いてろ過した後、シリコンウェハー上にスピンコートし、これをホットプレート上で150℃で30分間加熱して、絶縁層を得た。
得られた絶縁層にトルエン又はクロロホルムを滴下したところ、絶縁層は溶解しなかった。
絶縁層の一部を剥離して実施例1と同様に膜厚を測定したところ、320nmであった。この絶縁層を用い、実施例1と同様にして絶縁破壊電圧を測定したところ、100Vを印加しても絶縁破壊を起こさなかった。また、100Vを印加した時のリーク電流は、6.08×10-11A(電極面積=0.0314cm2)であった。
本実施例の絶縁層形成用溶液を用いたこと以外は、実施例1と同様にしてトランジスタを作製し、同様にトランジスタ特性及びヒステリシスを測定した。得られた結果を表1に示す。
(絶縁層形成用溶液の調製)
第1の化合物である高分子化合物4の2-ヘプタノン溶液1.00g、第2の化合物である1,4-フェニレンジアミン(和光純薬製)0.015g、2-ヘプタノン2.00gを、10mlのサンプル瓶に入れ、攪拌溶解して均一な溶液を調製した。
得られた溶液を0.2μmのメンブレンフィルターを用いてろ過した後、シリコンウェハー上にスピンコートし、これをホットプレート上で150℃で30分間加熱して、絶縁層を得た。
得られた絶縁層にトルエン又はクロロホルムを滴下したところ、絶縁層は溶解しなかった。
絶縁層の一部を剥離して実施例1と同様に膜厚を測定したところ、291nmであった。この絶縁層を用い、実施例1と同様にして絶縁破壊電圧を測定したところ、100Vを印加しても絶縁破壊を起こさなかった。また、100Vを印加した時のリーク電流は、1.97×10-8A(電極面積=0.0314cm2)であった。
本実施例の絶縁層形成用溶液を用いたこと以外は、実施例1と同様にしてトランジスタを作製し、同様にトランジスタ特性及びヒステリシスを測定した。得られた結果を表1に示す。
(絶縁層形成用溶液の調製)
第1の化合物である高分子化合物5の2-ヘプタノン溶液3.00g、第2の化合物である1,4-フェニレンジアミン(和光純薬製)0.041g、2-ヘプタノン3.00gを、10mlのサンプル瓶に入れ、攪拌溶解して均一な溶液を調製した。
得られた溶液を、0.2μmのメンブレンフィルターを用いてろ過した後、シリコンウェハー上にスピンコートし、これをホットプレート上で150℃で30分間加熱して、絶縁層を得た。
得られた絶縁層にトルエン又はクロロホルムを滴下したところ、絶縁層は溶解しなかった。
絶縁層の一部を剥離して実施例1と同様に膜厚を測定したところ、230nmであった。この絶縁層を用い、実施例1と同様にして絶縁破壊電圧を測定したところ、80Vを印加しても絶縁破壊を起こさなかった。また、80Vを印加した時のリーク電流は、1.55×10-9A(電極面積=0.0314cm2)であった。
本実施例の絶縁層形成用溶液を用いたこと以外は、実施例1と同様にしてトランジスタを作製し、同様にトランジスタ特性及びヒステリシスを測定した。得られた結果を表1に示す。
(絶縁層形成用溶液の調製)
第1の化合物である高分子化合物1の2-ヘプタノン溶液0.50g、第2の化合物である2-(4’-ヒドロキシフェニル)エチル-ジメチルシリル-ポリシルセスキオキサン樹脂(BOPH樹脂;東亞合成製、ポリスチレン換算の重量平均分子量=10000)の42.4重量%2-ヘプタノン溶液1.00g、2-ヘプタノン2.30gを、10mlのサンプル瓶に入れ、攪拌溶解して均一な溶液を調製した。
得られた溶液を、0.2μmのメンブレンフィルターを用いてろ過した後、シリコンウェハー上にスピンコートし、これをホットプレート上で150℃で90分間加熱して、絶縁層を得た。
得られた絶縁層にトルエン又はクロロホルムを滴下したところ、絶縁層は溶解しなかった。
絶縁層の一部を剥離して実施例1と同様に膜厚を測定したところ、376nmであった。この絶縁層を用い、実施例1と同様にして絶縁破壊電圧を測定したところ、100Vを印加しても絶縁破壊を起こさなかった。また、100Vを印加した時のリーク電流は、6.66×10-9A(電極面積=0.0314cm2)であった。
(絶縁層形成用溶液の調製)
第1の化合物である高分子化合物1の2-ヘプタノン溶液0.45g、第2の化合物である高分子化合物6の2-ヘプタノン溶液0.50g、2-ヘプタノン2.00gを、10mlのサンプル瓶に入れ、攪拌溶解して均一な溶液を調製した。
得られた溶液を、0.2μmのメンブレンフィルターを用いてろ過した後、シリコンウェハー上にスピンコートし、これをホットプレート上で150℃で90分間加熱して、絶縁層を得た。
得られた絶縁層にトルエン又はクロロホルムを滴下したところ、絶縁層は溶解しなかった。
絶縁層の一部を剥離して実施例1と同様に膜厚を測定したところ、240nmであった。この絶縁層を用い、実施例1と同様にして絶縁破壊電圧を測定したところ、100Vを印加しても絶縁破壊を起こさなかった。また、100Vを印加した時のリーク電流は、5.81×10-7A(電極面積=0.0314cm2)であった。
(絶縁層形成用溶液の調製)
第1の化合物である高分子化合物1の2-ヘプタノン溶液0.081g、第2の化合物であるポリビニルフェノール-co-ポリメチルメタクリレート(アルドリッチ製)1.00g、プロピレングリコールモノメチルエーテルアセテート7.00gを、10mlのサンプル瓶に入れ、攪拌溶解して均一な溶液を調製した。
得られた溶液を0.2μmのメンブレンフィルターを用いてろ過した後、シリコンウェハー上にスピンコートし、これをホットプレート上で150℃で30分間加熱して、絶縁層を得た。
得られた絶縁層にトルエン又はクロロホルムを滴下したところ、絶縁層は溶解しなかった。
絶縁層の一部を剥離して実施例1と同様に膜厚を測定したところ、440nmであった。この絶縁層を用い、実施例1と同様にして絶縁破壊電圧を測定したところ、100Vを印加しても絶縁破壊を起こさなかった。また、100Vを印加した時のリーク電流は、1.93×10-8A(電極面積=0.0314cm2)であった。
(絶縁層形成用溶液の調製)
第1の化合物である高分子化合物7の2-ヘプタノン溶液3.00g、第2の化合物である1,4-フェニレンジアミン(和光純薬製)0.047g、2-ヘプタノン4.20gを10mlのサンプル瓶に入れ、攪拌溶解して均一な溶液を調製した。
得られた溶液を0.2μmのメンブレンフィルターを用いてろ過した後、シリコンウェハー上にスピンコートした後、ホットプレート上で150℃で90分間焼成し、絶縁層を得た。
得られた絶縁層上にトルエン又はクロロホルムを滴下したところ、絶縁層は溶解しなかった。
絶縁層の一部を剥離して実施例1と同様に膜厚を測定したところ360nmであった。この絶縁層を用い、実施例1と同様にして絶縁破壊電圧を測定したところ、100Vを印加しても絶縁破壊を起こさなかった。また、100Vを印加した時のリーク電流は、3.47×10-8A(電極面積=0.0314cm2)であった。
本実施例の絶縁層形成用溶液を用いたこと以外は、実施例1と同様にしてトランジスタを作製し、同様にトランジスタ特性を測定した。その結果、閾値電圧(Vth)は、-18.6Vであり、ON/OFF比は、6.3×10-5であった。
(絶縁層形成用溶液の調製)
第2の化合物であるポリビニルフェノール(アルドリッチ製、重量平均分子量=8000)1.00g、第1の化合物である合成例8で得られた1,3-ジ[O-(1-メチルエチリデンアミノ)カルボキシアミノ]ベンゼン0.10g、2-ヘプタノン7.40gを、10mlのサンプル瓶に入れ、攪拌溶解して均一な溶液を調製した。
得られた溶液を0.2μmのメンブレンフィルターを用いてろ過した後、シリコンウェハー上にスピンコートし、これをホットプレート上で150℃で90分間加熱して、絶縁層を得た。
得られた絶縁層にトルエン又はクロロホルムを滴下したところ、絶縁層は溶解しなかった。
絶縁層の一部を剥離して実施例1と同様に膜厚を測定したところ、319nmであった。この絶縁層を用い、実施例1と同様にして絶縁破壊電圧を測定したところ、100Vを印加しても絶縁破壊を起こさなかった。また、100Vを印加した時のリーク電流は、2.79×10-4A(電極面積=0.0314cm2)であった。
(絶縁層形成用溶液の調製)
第2の化合物であるポリビニルフェノール(アルドリッチ製、ポリスチレン換算の重量平均分子量=8000)1.00g、第1の化合物である合成例8で得られた1,3-ジ[O-(1-メチルエチリデンアミノ)カルボキシアミノ]ベンゼン0.30g、2-ヘプタノン8.70gを、10mlのサンプル瓶に入れ、攪拌溶解して均一な溶液を調製した。
得られた溶液を0.2μmのメンブレンフィルターを用いてろ過した後、シリコンウェハー上にスピンコートし、これをホットプレート上で150℃で90分間加熱して、絶縁層を得た。
得られた絶縁層にトルエン又はクロロホルムを滴下したところ、絶縁層は溶解しなかった。
絶縁層の一部を剥離して実施例1と同様に膜厚を測定したところ、256nmであった。この絶縁層を用い、実施例1と同様にして絶縁破壊電圧を測定したところ、100Vを印加しても絶縁破壊を起こさなかった。また、100Vを印加した時のリーク電流は、5.98×10-4A(電極面積=0.0314cm2)であった。
(絶縁層形成用溶液の調製)
第2の化合物であるポリ(4-ビニルフェノール)(アルドリッチ製、ポリスチレン換算の重量平均分子量=8000)1.00g、第1の化合物である合成例8で得られた1,3-ジ[O-(1-メチルエチリデンアミノ)カルボキシアミノ]ベンゼン0.60g、2-ヘプタノン8.70gを、10mlのサンプル瓶に入れ、攪拌溶解して均一な溶液を調製した。
得られた溶液を0.2μmのメンブレンフィルターを用いてろ過した後、シリコンウェハー上にスピンコートし、これをホットプレート上で150℃で90分間加熱して、絶縁層を得た。
得られた絶縁層にトルエン又はクロロホルムを滴下したところ、絶縁層は溶解しなかった。
絶縁層の一部を剥離して実施例1と同様に膜厚を測定したところ、203nmであった。この絶縁層を用い、実施例1と同様にして絶縁破壊電圧を測定したところ、100Vを印加しても絶縁破壊を起こさなかった。また、100Vを印加した時のリーク電流は、1.48×10-4A(電極面積=0.0314cm2)であった。
本実施例の絶縁層形成用溶液を用いたこと以外は、実施例1と同様にしてトランジスタを作製し、同様にトランジスタ特性及びヒステリシスを測定した。得られた結果を表1に示す。
(絶縁層形成用溶液の調製)
第2の化合物であるポリビニルフェノール-co-ポリメチルメタクリレート(アルドリッチ製)1.00g、第1の化合物である合成例8で得られた1,3-ジ[O-(1-メチルエチリデンアミノ)カルボキシアミノ]ベンゼン0.10g、2-ヘプタノン7.40gを、10mlのサンプル瓶に入れ、攪拌溶解して均一な溶液を調製した。
得られた溶液を0.2μmのメンブレンフィルターを用いてろ過した後、シリコンウェハー上にスピンコートし、これをホットプレート上で150℃で90分間加熱して、絶縁層を得た。
得られた絶縁層にトルエン又はクロロホルムを滴下したところ、絶縁層は溶解しなかった。
絶縁層の一部を剥離して実施例1と同様に膜厚を測定したところ、289nmであった。この絶縁層を用い、実施例1と同様にして絶縁破壊電圧を測定したところ、100Vを印加しても絶縁破壊を起こさなかった。また、100Vを印加した時のリーク電流は、5.37×10-7A(電極面積=0.0314cm2)であった。
(絶縁層形成用溶液の調製)
第2の化合物であるポリビニルフェノール-co-ポリメチルメタクリレート(アルドリッチ製)1.00g、第1の化合物である合成例8で得られた1,3-ジ[O-(1-メチルエチリデンアミノ)カルボキシアミノ]ベンゼン0.20g、2-ヘプタノン8.00gを、10mlのサンプル瓶に入れ、攪拌溶解して均一な溶液を調製した。
得られた溶液を0.2μmのメンブレンフィルターを用いてろ過した後、シリコンウェハー上にスピンコートし、これをホットプレート上で150℃で90分間加熱して、絶縁層を得た。
(絶縁層の耐溶剤性の評価)
絶縁層の一部を剥離して実施例1と同様に膜厚を測定したところ、336nmであった。この絶縁層を用い、実施例1と同様にして絶縁破壊電圧を測定したところ、100Vを印加しても絶縁破壊を起こさなかった。また、100Vを印加した時のリーク電流は、1.42×10-7A(電極面積=0.0314cm2)であった。
(絶縁層形成用溶液の調製)
第2の化合物であるポリビニルフェノール-co-ポリメチルメタクリレート(アルドリッチ製)1.00g、第1の化合物である合成例8で得られた1,3-ジ[O-(1-メチルエチリデンアミノ)カルボキシアミノ]ベンゼン0.30g、2-ヘプタノン8.70gを、10mlのサンプル瓶に入れ、攪拌溶解して均一な溶液を調製した。
得られた溶液を0.2μmのメンブレンフィルターを用いてろ過した後、シリコンウェハー上にスピンコートし、これをホットプレート上で150℃で90分間加熱して、絶縁層を得た。
得られた絶縁層にトルエン又はクロロホルムを滴下したところ、絶縁層は溶解しなかった。
絶縁層の一部を剥離して実施例1と同様に膜厚を測定したところ、298nmであった。この絶縁層を用い、実施例1と同様にして絶縁破壊電圧を測定したところ、100Vを印加しても絶縁破壊を起こさなかった。また、100Vを印加した時のリーク電流は、2.86×10-7A(電極面積=0.0314cm2)であった。
本実施例の絶縁層形成用溶液を用いたこと以外は、実施例1と同様にしてトランジスタを作製し、同様にトランジスタ特性及びヒステリシスを測定した。得られた結果を表1に示す。
(絶縁層形成用溶液の調製)
ポリ(4-ビニルフェノール)(アルドリッチ製、ポリスチレン換算の重量平均分子量=8000)1.00g、ポリ(メラミン-co-ホルムアルデヒド)メチル化物の84重量%1-ブタノール溶液(アルドリッチ製)0.194g、2-ヘプタノン7.00gを、10mlのサンプル瓶に入れ、攪拌溶解して均一な溶液を調製した。
得られた溶液を0.2μmのメンブレンフィルターを用いてろ過した後、シリコンウェハー上にスピンコートし、これをホットプレート上で200℃で1時間加熱して、絶縁層を得た。
得られた絶縁層にトルエン又はクロロホルムを滴下したところ、絶縁層は溶解しなかった。
絶縁層の一部を剥離して実施例1と同様に膜厚を測定したところ、380nmであった。この絶縁層を用い、実施例1と同様にして絶縁破壊電圧を測定したところ、100Vを印加しても絶縁破壊を起こさなかった。また、80Vを印加した時のリーク電流は、3.01×10-7A(電極面積=0.0314cm2)であった。
本比較例の絶縁層形成用溶液を用いたこと以外は、実施例1と同様にしてトランジスタを作製し、同様にトランジスタ特性及びヒステリシスを測定した。得られた結果を表1に示す。
Claims (7)
- ソース電極と、ドレイン電極と、これらの間の電流経路となる有機半導体層と、前記電流経路を通る電流を制御するゲート電極と、前記有機半導体層と前記ゲート電極とを絶縁する絶縁層と、を備える有機薄膜トランジスタであって、
前記絶縁層が、分子内に電磁線又は熱により活性水素基と反応する官能基を生成する基を2個以上有する第1の化合物と、分子内に活性水素基を2個以上有する第2の化合物と、を含み、且つ前記第1及び第2の化合物の少なくとも一方が高分子化合物である組成物の硬化物からなる、
ことを特徴とする有機薄膜トランジスタ。 - 前記電磁線又は熱により活性水素基と反応する官能基を生成する基が、ブロックされたイソシアナト基又はブロックされたイソチオシアナト基である、ことを特徴とする請求項1記載の有機薄膜トランジスタ。
- 前記第1の化合物が、下記一般式(2a)で表される構造単位及び下記一般式(2b)で表される構造単位からなる群より選ばれる少なくとも1種の構造単位と、下記一般式(2c)で表される構造単位、下記一般式(2d)で表される構造単位及び下記一般式(2e)で表される構造単位からなる群より選ばれる少なくとも1種の構造単位と、を有する高分子化合物である、ことを特徴とする請求項1~3のいずれか一項に記載の有機薄膜トランジスタ。
- ソース電極と、ドレイン電極と、これらの間の電流経路となる有機半導体層と、前記電流経路を通る電流を制御するゲート電極と、前記有機半導体層と前記ゲート電極とを絶縁する絶縁層と、を備える有機薄膜トランジスタの製造方法であって、
前記絶縁層を、当該絶縁層を形成する面上に、分子内に電磁線又は熱により活性水素基と反応する官能基を生成する基を2個以上有する第1の化合物と、分子内に活性水素基を2個以上有する第2の化合物と、を含み、且つ前記第1及び第2の化合物の少なくとも一方が高分子化合物である組成物を塗布し、硬化させることにより形成する、
ことを特徴とする有機薄膜トランジスタの製造方法。 - 請求項1~4のいずれか一項に記載の有機薄膜トランジスタを用いたディスプレイ用部材。
- 請求項6記載のディスプレイ用部材を備えるディスプレイ。
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See also references of EP2312636A4 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11326006B2 (en) | 2017-07-04 | 2022-05-10 | Sumitomo Chemical Company, Limited | Organic thin-film transistor and polymer compound |
Also Published As
Publication number | Publication date |
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JP5199752B2 (ja) | 2013-05-15 |
EP2312636A4 (en) | 2011-09-14 |
KR20110036909A (ko) | 2011-04-12 |
TWI476974B (zh) | 2015-03-11 |
TW201008001A (en) | 2010-02-16 |
KR101547718B1 (ko) | 2015-08-26 |
CN102077355A (zh) | 2011-05-25 |
JP2010010608A (ja) | 2010-01-14 |
EP2312636A1 (en) | 2011-04-20 |
US8507898B2 (en) | 2013-08-13 |
US20110147726A1 (en) | 2011-06-23 |
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