WO2009116373A1 - ゲート絶縁材料、ゲート絶縁膜、および有機電界効果型トランジスタ - Google Patents
ゲート絶縁材料、ゲート絶縁膜、および有機電界効果型トランジスタ Download PDFInfo
- Publication number
- WO2009116373A1 WO2009116373A1 PCT/JP2009/053628 JP2009053628W WO2009116373A1 WO 2009116373 A1 WO2009116373 A1 WO 2009116373A1 JP 2009053628 W JP2009053628 W JP 2009053628W WO 2009116373 A1 WO2009116373 A1 WO 2009116373A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gate insulating
- group
- insulating material
- polysiloxane
- insulating film
- Prior art date
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- 239000011593 sulfur Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 150000000000 tetracarboxylic acids Chemical class 0.000 description 1
- IFLREYGFSNHWGE-UHFFFAOYSA-N tetracene Chemical compound C1=CC=CC2=CC3=CC4=CC=CC=C4C=C3C=C21 IFLREYGFSNHWGE-UHFFFAOYSA-N 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- LFQCEHFDDXELDD-UHFFFAOYSA-N tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 description 1
- QEMXHQIAXOOASZ-UHFFFAOYSA-N tetramethylammonium Chemical compound C[N+](C)(C)C QEMXHQIAXOOASZ-UHFFFAOYSA-N 0.000 description 1
- URMVZUQDPPDABD-UHFFFAOYSA-N thieno[2,3-f][1]benzothiole Chemical compound C1=C2SC=CC2=CC2=C1C=CS2 URMVZUQDPPDABD-UHFFFAOYSA-N 0.000 description 1
- 125000001544 thienyl group Chemical group 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 1
- HMVGCSCUAUZFLC-UHFFFAOYSA-N tri(propan-2-yloxy)-(2,2,2-trifluoroethyl)silane Chemical compound CC(C)O[Si](CC(F)(F)F)(OC(C)C)OC(C)C HMVGCSCUAUZFLC-UHFFFAOYSA-N 0.000 description 1
- PCADGSDEFOMDNL-UHFFFAOYSA-N tri(propan-2-yloxy)-(3,3,3-trifluoropropyl)silane Chemical compound CC(C)O[Si](OC(C)C)(OC(C)C)CCC(F)(F)F PCADGSDEFOMDNL-UHFFFAOYSA-N 0.000 description 1
- LGQXXHMEBUOXRP-UHFFFAOYSA-N tributyl borate Chemical compound CCCCOB(OCCCC)OCCCC LGQXXHMEBUOXRP-UHFFFAOYSA-N 0.000 description 1
- PMQIWLWDLURJOE-UHFFFAOYSA-N triethoxy(1,1,2,2,3,3,4,4,5,5,6,6,7,7,10,10,10-heptadecafluorodecyl)silane Chemical compound CCO[Si](OCC)(OCC)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)CCC(F)(F)F PMQIWLWDLURJOE-UHFFFAOYSA-N 0.000 description 1
- BPCXHCSZMTWUBW-UHFFFAOYSA-N triethoxy(1,1,2,2,3,3,4,4,5,5,8,8,8-tridecafluorooctyl)silane Chemical compound CCO[Si](OCC)(OCC)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)CCC(F)(F)F BPCXHCSZMTWUBW-UHFFFAOYSA-N 0.000 description 1
- NOBMQPILAFKJLD-UHFFFAOYSA-N triethoxy(2,2,2-trifluoroethyl)silane Chemical compound CCO[Si](CC(F)(F)F)(OCC)OCC NOBMQPILAFKJLD-UHFFFAOYSA-N 0.000 description 1
- ZLGWXNBXAXOQBG-UHFFFAOYSA-N triethoxy(3,3,3-trifluoropropyl)silane Chemical compound CCO[Si](OCC)(OCC)CCC(F)(F)F ZLGWXNBXAXOQBG-UHFFFAOYSA-N 0.000 description 1
- JCVQKRGIASEUKR-UHFFFAOYSA-N triethoxy(phenyl)silane Chemical compound CCO[Si](OCC)(OCC)C1=CC=CC=C1 JCVQKRGIASEUKR-UHFFFAOYSA-N 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- JLGNHOJUQFHYEZ-UHFFFAOYSA-N trimethoxy(3,3,3-trifluoropropyl)silane Chemical compound CO[Si](OC)(OC)CCC(F)(F)F JLGNHOJUQFHYEZ-UHFFFAOYSA-N 0.000 description 1
- PBRKCNMSBIMTKC-UHFFFAOYSA-N triphenyl-(10-triphenylsilylanthracen-9-yl)silane Chemical compound C1=CC=CC=C1[Si](C=1C2=CC=CC=C2C(=C2C=CC=CC2=1)[Si](C=1C=CC=CC=1)(C=1C=CC=CC=1)C=1C=CC=CC=1)(C=1C=CC=CC=1)C1=CC=CC=C1 PBRKCNMSBIMTKC-UHFFFAOYSA-N 0.000 description 1
- WLOQLWBIJZDHET-UHFFFAOYSA-N triphenylsulfonium Chemical compound C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 WLOQLWBIJZDHET-UHFFFAOYSA-N 0.000 description 1
- 239000012953 triphenylsulfonium Substances 0.000 description 1
- FAYMLNNRGCYLSR-UHFFFAOYSA-M triphenylsulfonium triflate Chemical compound [O-]S(=O)(=O)C(F)(F)F.C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 FAYMLNNRGCYLSR-UHFFFAOYSA-M 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000004034 viscosity adjusting agent Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
- C08G59/22—Di-epoxy compounds
- C08G59/30—Di-epoxy compounds containing atoms other than carbon, hydrogen, oxygen and nitrogen
- C08G59/306—Di-epoxy compounds containing atoms other than carbon, hydrogen, oxygen and nitrogen containing silicon
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- 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
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- C—CHEMISTRY; METALLURGY
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- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
- C08G59/32—Epoxy compounds containing three or more epoxy groups
- C08G59/3254—Epoxy compounds containing three or more epoxy groups containing atoms other than carbon, hydrogen, oxygen or nitrogen
- C08G59/3281—Epoxy compounds containing three or more epoxy groups containing atoms other than carbon, hydrogen, oxygen or nitrogen containing silicon
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- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/04—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers only
- C08G65/06—Cyclic ethers having no atoms other than carbon and hydrogen outside the ring
- C08G65/16—Cyclic ethers having four or more ring atoms
- C08G65/20—Tetrahydrofuran
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- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/075—Silicon-containing compounds
- G03F7/0757—Macromolecular compounds containing Si-O, Si-C or Si-N bonds
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/40—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes epoxy resins
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- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/46—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes silicones
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/02126—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02205—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition
- H01L21/02208—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si
- H01L21/02214—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si the compound comprising silicon and oxygen
- H01L21/02216—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si the compound comprising silicon and oxygen the compound being a molecule comprising at least one silicon-oxygen bond and the compound having hydrogen or an organic group attached to the silicon or oxygen, e.g. a siloxane
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02282—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process liquid deposition, e.g. spin-coating, sol-gel techniques, spray coating
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/312—Organic layers, e.g. photoresist
- H01L21/3121—Layers comprising organo-silicon compounds
- H01L21/3122—Layers comprising organo-silicon compounds layers comprising polysiloxane compounds
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- 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
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- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/10—Organic polymers or oligomers
- H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
- H10K85/113—Heteroaromatic compounds comprising sulfur or selene, e.g. polythiophene
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- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/655—Aromatic compounds comprising a hetero atom comprising only sulfur as heteroatom
Definitions
- the present invention relates to a gate insulating material, a gate insulating film, and an organic field effect transistor.
- an organic field effect transistor (hereinafter referred to as an organic FET) using an organic semiconductor having excellent moldability as a semiconductor layer has been proposed.
- an organic semiconductor As an ink, it becomes possible to form a circuit pattern directly on a substrate by an ink jet technique or a screening technique. Therefore, a field effect transistor (hereinafter referred to as an FET) using a conventional inorganic semiconductor.
- organic FETs using organic semiconductors are being actively studied.
- An important index indicating the performance of the FET is mobility. The improvement in mobility means that the on-current is increased. This is to improve the switching characteristics of the FET. For example, in a liquid crystal display device, high gradation is realized.
- a mobility of 0.1 cm 2 / V ⁇ sec or more is required.
- Another important indicator is hysteresis.
- the hysteresis represents the fluctuation range of the current value with respect to the voltage history, and it is necessary to reduce the hysteresis value in order to stably drive the FET.
- gate insulating film As an important member of FET. Usually, a semiconductor layer is formed on a gate insulating layer made of a gate insulating film, but a channel that is a current path is formed near the gate insulating layer interface in the semiconductor layer. This greatly affects the FET characteristics.
- As a general gate insulating film there is an inorganic film such as silicon oxide. However, since an expensive vacuum apparatus such as CVD is required to form the inorganic film, the cost is high. Moreover, a high temperature process is required for forming the inorganic film, and there is a problem that it is difficult to fabricate on a flexible substrate such as plastic. On the other hand, since organic materials such as organic polymers are soluble in organic solvents, they can be formed on a flexible substrate by a low-temperature process because low-cost thin film formation by coating methods such as inkjet printing is possible. Research has been done.
- a combination of polyvinylphenol and a crosslinking agent is known as an example of a coating-type gate insulating material that is soluble in an organic solvent (see, for example, Non-Patent Document 1).
- polar groups such as amino groups and phenol groups remain, there is a problem that FET characteristics, particularly hysteresis, is large.
- the chemical solution may infiltrate or swell into the insulating film and deteriorate the insulating film in the resist coating, developing, and peeling processes. There is.
- Examples of other gate insulating films include polysiloxane (see, for example, Patent Documents 1 to 3).
- polysiloxane since polysiloxane has high water repellency, it is applied in a resist or organic semiconductor coating process on the polysiloxane film. There was a problem that repelling of the liquid occurred and it was difficult to form a uniform film.
- a method for improving the coating property of a photoresist with a polysiloxane having an epoxy group introduced therein has been disclosed, but there is no report on an FET using the polysiloxane.
- JP-A-2004-304121 (Claims) Japanese Patent Laying-Open No. 2005-120371 (Claims) JP 2007-258663 A (Claims) JP 2007-119744 A (Claims) “APPLIED PHYSICS LETTERS, vol. 82, p. 4175-4177 (2003)
- An object of the present invention is to provide a gate insulating material, a gate insulating film, and an FET using the same, which are excellent in chemical resistance, resist and coating properties of an organic semiconductor coating solution and enable low hysteresis.
- the present invention is a gate insulating material containing polysiloxane having at least a silane compound represented by the general formula (1) and an epoxy group-containing silane compound represented by the general formula (2) as a copolymerization component.
- R 1 m Si (OR 2 ) 4-m (1)
- R 1 represents hydrogen, an alkyl group, a cycloalkyl group, a heterocyclic group, an aryl group, a heteroaryl group or an alkenyl group, and when a plurality of R 1 are present, each R 1 may be the same or different.
- R 2 represents an alkyl group or a cycloalkyl group, and when a plurality of R 2 are present, each R 2 may be the same or different.
- R 3 represents an alkyl group or a cycloalkyl group having one or more epoxy groups in a part of the chain, and when a plurality of R 3 are present, each R 3 may be the same or different.
- R 4 represents hydrogen, an alkyl group, a cycloalkyl group, a heterocyclic group, an aryl group, a heteroaryl group, or an alkenyl group. When a plurality of R 4 are present, each R 4 may be the same or different.
- R 5 represents an alkyl group or a cycloalkyl group, and when a plurality of R 5 are present, each R 5 may be the same or different.
- l represents an integer of 0 to 2
- n represents 1 or 2. However, l + n ⁇ 3.
- the present invention is a gate insulating film obtained by heat-treating a coating film formed by applying the gate insulating material in a range of 100 ° C. to 300 ° C.
- the present invention is an organic field effect transistor having a gate electrode, a gate insulating layer, a semiconductor layer, a source electrode, and a drain electrode, wherein the gate insulating layer contains the gate insulating film. .
- a gate insulating material a gate insulating film, and an organic field effect transistor using the same, which are excellent in chemical resistance, resist and coating properties of an organic semiconductor coating liquid and enable low hysteresis. Can do.
- a polysiloxane having at least a silane compound represented by the general formula (1) and an epoxy group-containing silane compound represented by the general formula (2) as a copolymerization component will be described in detail.
- R 1 m Si (OR 2 ) 4-m R 1 represents hydrogen, an alkyl group, a cycloalkyl group, a heterocyclic group, an aryl group, a heteroaryl group or an alkenyl group, and when a plurality of R 1 are present, each R 1 may be the same or different.
- R 2 represents an alkyl group or a cycloalkyl group, and when a plurality of R 2 are present, each R 2 may be the same or different.
- m represents an integer of 1 to 3.
- the alkyl group represents, for example, a saturated aliphatic hydrocarbon group such as a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, or a tert-butyl group, which is a substituent. It may or may not have.
- the additional substituent is not particularly limited, and examples thereof include an alkoxy group, an aryl group, a heteroaryl group, and the like, and these may further have a substituent. .
- the number of carbon atoms of the alkyl group is not particularly limited, but is preferably 1 or more and 20 or less, more preferably 1 or more and 8 or less, from the viewpoint of availability and cost.
- the cycloalkyl group refers to, for example, a saturated alicyclic hydrocarbon group such as a cyclopropyl group, a cyclohexyl group, a norbornyl group, an adamantyl group, which may or may not have a substituent.
- the substituent is not particularly limited, and examples thereof include an alkyl group, an alkoxy group, an aryl group, a heteroaryl group, and the like, and these substituents may further have a substituent. .
- the explanation regarding these substituents is common to the following descriptions. Although carbon number of a cycloalkyl group is not specifically limited, The range of 3-20 is preferable.
- the heterocyclic group refers to, for example, a group derived from an aliphatic ring having a non-carbon atom in the ring, such as a pyran ring, a piperidine ring, an amide ring, and the like, which has a substituent. It does not have to be.
- carbon number of a heterocyclic group is not specifically limited, The range of 2-20 is preferable.
- the aryl group refers to, for example, an aromatic hydrocarbon group such as a phenyl group, a naphthyl group, a biphenyl group, an anthracenyl group, a phenanthryl group, a terphenyl group, and a pyrenyl group, which has a substituent. It does not have to be.
- the number of carbon atoms of the aryl group is not particularly limited, but is preferably in the range of 6 to 40.
- a heteroaryl group refers to an aromatic group having one or more atoms other than carbon in the ring, such as a furanyl group, a thiophenyl group, a benzofuranyl group, a dibenzofuranyl group, a pyridyl group, or a quinolinyl group. It may or may not have a substituent.
- the number of carbon atoms of the heteroaryl group is not particularly limited, but is preferably in the range of 2-30.
- alkenyl group refers to an unsaturated aliphatic hydrocarbon group containing a double bond such as a vinyl group, an allyl group, or a butadienyl group, which may or may not have a substituent. Although carbon number of an alkenyl group is not specifically limited, The range of 2-20 is preferable.
- alkoxy group mentioned above as a substituent represents a functional group obtained by substituting one of the ether bonds with an aliphatic hydrocarbon group, such as a methoxy group, an ethoxy group, or a propoxy group. It may or may not have a substituent. Although carbon number of an alkoxy group is not specifically limited, The range of 1-20 is preferable.
- silane compound represented by the general formula (1) By introducing the silane compound represented by the general formula (1) into the polysiloxane used in the present invention, while maintaining high transparency in the visible light region, the insulation and chemical resistance are enhanced, and the cause of hysteresis is A gate insulating film with few traps in the insulating film can be formed.
- the general formula (1) at least one of m R 1 in it is an aryl group or a heteroaryl group, increased flexibility of the gate insulating film is preferable because cracking can be prevented.
- silane compound represented by the general formula (1) used in the present invention include vinyltrimethoxysilane, vinyltriethoxysilane, 3-methacryloxypropyltrimethoxysilane, and 3-methacryloxypropyltriethoxysilane.
- Methyltrimethoxysilane methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, propyltrimethoxysilane, propyltriethoxysilane, hexyltrimethoxysilane, octadecyltrimethoxysilane, octadecyltriethoxysilane, phenyltrimethoxysilane , Phenyltriethoxysilane, p-tolyltrimethoxysilane, benzyltrimethoxysilane, ⁇ -naphthyltrimethoxysilane, ⁇ -naphthyltrimethoxysilane, 3-aminopropylto Riethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, 3-chloro
- m 1 vinyltrimethoxysilane, vinyltriethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethylsilane, in order to increase crosslink density and improve chemical resistance and insulation properties.
- vinyltrimethoxysilane R 2 is a methyl group, methyltrimethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, hexyltrimethoxysilane, octadecyltrimethoxysilane, octadecyl trimethoxysilane, It is particularly preferable to use phenyltrimethoxysilane, p-tolyltrimethoxysilane, benzyltrimethoxysilane, ⁇ -naphthyltrimethoxysilane, ⁇ -naphthyltrimethoxysilane, trifluoroethyltrimethoxysilane, and trimethoxysilane.
- silane compounds represented by the general formula (1) it is preferable to combine two or more silane compounds represented by the general formula (1).
- a combination of a silane compound having an alkyl group and a silane compound having an aryl group or a heteroaryl group is particularly preferable because both high insulating properties and flexibility for preventing cracks can be achieved.
- R 3 represents an alkyl group or a cycloalkyl group having one or more epoxy groups in a part of the chain, and when a plurality of R 3 are present, each R 3 may be the same or different.
- R 4 represents hydrogen, an alkyl group, a cycloalkyl group, a heterocyclic group, an aryl group, a heteroaryl group, or an alkenyl group. When a plurality of R 4 are present, each R 4 may be the same or different.
- R 5 represents an alkyl group or a cycloalkyl group, and when a plurality of R 5 are present, each R 5 may be the same or different.
- l represents an integer of 0 to 2
- n represents 1 or 2. However, l + n ⁇ 3.
- the alkyl group or cycloalkyl group having an epoxy group of R 3 in a part of the chain is a three-membered ring ether structure formed by combining two adjacent carbon atoms with one oxygen atom.
- R 3 to R 5 are the same as those of R 1 and R 2 above.
- the polysiloxane used in the present invention can improve the coating property of the resist and organic semiconductor coating liquid on the gate insulating film, In addition, an excellent FET with small hysteresis can be obtained.
- epoxy group-containing silane compound represented by the general formula (2) used in the present invention examples include ⁇ -glycidoxypropyltrimethoxysilane and ⁇ - (3,4-epoxycyclohexyl) ethyltrimethoxysilane.
- the polysiloxane used in the present invention can contain other silane compounds as copolymerization components in addition to the silane compound represented by the general formula (1) or (2).
- examples of other silane compounds include tetramethoxysilane and tetraethoxysilane.
- content of the structural unit derived from the epoxy group containing silane compound represented by General formula (2) among polysiloxane is 0.00 with respect to all the structural units of the silane compound which is a copolymerization component of polysiloxane. It is preferably 1 mol% to 40 mol%. If it is 0.1 mol% or more, the favorable coating property which suppressed the repelling of the organic-semiconductor coating liquid can be obtained, and 1 mol% or more is more preferable. On the other hand, if it is 40 mol% or less, excellent FET characteristics with small hysteresis can be obtained, and 35 mol% or less is more preferable.
- the polysiloxane used in the present invention can be obtained, for example, by the following method. All silane compounds are dissolved in a solvent, and an acid catalyst and water are added thereto over 1 to 180 minutes, followed by hydrolysis at room temperature to 80 ° C. for 1 to 180 minutes. The temperature during the hydrolysis reaction is more preferably room temperature to 55 ° C. An epoxy group-containing polysiloxane can be obtained by heating this reaction solution at 50 ° C. or more and below the boiling point of the solvent for 1 to 100 hours to perform a condensation reaction.
- reaction scale for example, by setting the acid concentration, reaction temperature, reaction time, etc., the physical properties suitable for the intended application Can be obtained.
- Acid catalysts used for the hydrolysis reaction of silane compounds include formic acid, oxalic acid, hydrochloric acid, sulfuric acid, acetic acid, trifluoroacetic acid, phosphoric acid, polyphosphoric acid, polyvalent carboxylic acid or anhydrides thereof, and ion exchange resins.
- a catalyst is mentioned.
- the content of the acid catalyst is preferably 0.05 parts by weight or more, and more preferably 0.1 parts by weight or more with respect to 100 parts by weight of the total silane compound that is a copolymer component of polysiloxane. Moreover, 10 weight part or less is preferable and 5 weight part or less is more preferable. If the content of the acid catalyst is 0.05 parts by weight or more, the hydrolysis reaction proceeds sufficiently, and if it is 10 parts by weight or less, a rapid reaction can be suppressed.
- the solvent used for the hydrolysis reaction is preferably an organic solvent, alcohols such as ethanol, propanol, butanol and 3-methyl-3-methoxy-1-butanol, glycols such as ethylene glycol and propylene glycol, and ethylene glycol monomethyl.
- Ethers such as propylene glycol monomethyl ether, propylene glycol monobutyl ether and diethyl ether, ketones such as methyl isobutyl ketone and diisobutyl ketone, amides such as dimethylformamide and dimethylacetamide, ethyl acetate, ethyl cellosolve acetate, 3-methyl Acetates such as -3-methoxy-1-butanol acetate, aromatics such as toluene, xylene, hexane, cyclohexane or In addition to aliphatic hydrocarbon, .gamma.-butyrolactone, N- methyl-2-pyrrolidone, dimethyl sulfoxide and the like.
- the amount of the solvent is preferably in the range of 50 to 500 parts by weight with respect to 100 parts by weight of the total silane compound that is a copolymer component of polysiloxane. If it is 50 parts by weight or more, rapid reaction can be suppressed, and if it is 500 parts by weight or less, hydrolysis can be sufficiently advanced.
- ion-exchanged water is preferable as water used for hydrolysis.
- the amount of water can be arbitrarily selected.
- reheating or addition of a base catalyst can be performed.
- Polysiloxane containing an epoxy group-containing silane compound used in the present invention as a copolymerization component is suitable as a gate insulating material because it has high insulation and chemical resistance and has few traps in the insulating film that cause hysteresis. Used for. Whether the polysiloxane contains an epoxy group-containing silane compound can be determined by combining various organic analysis methods such as elemental analysis, nuclear magnetic resonance analysis, and infrared spectroscopic analysis, singly or in combination.
- the gate insulating material of the present invention may contain one or more polysiloxanes.
- One or more polysiloxanes and one or more silane compounds may be mixed and used.
- the gate insulating material of the present invention preferably further contains a solvent having a boiling point of 110 to 200 ° C. at 1 atmosphere.
- a solvent having a boiling point of 110 to 200 ° C. at 1 atmosphere include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol mono n-butyl ether, propylene glycol mono t-butyl ether, ethylene glycol.
- Ethers such as dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol ethyl methyl ether, ethylene glycol monoethyl ether acetate, propylene glycol monomethyl ether acetate, propyl acetate, butyl acetate, isobutyl acetate, 3-methoxybutyl acetate, 3 -Methyl-3-methoxybutyl acetate , Acetates such as methyl lactate, ethyl lactate and butyl lactate, ketones such as acetylacetone, methylpropylketone, methylbutylketone, methylisobutylketone, cyclopentanone, 2-heptanone, butyl alcohol, isobutyl alcohol, pentanol, Examples include alcohols such as 4-methyl-2-pentanol, 3-methyl-2-butanol, 3-methyl-3-methoxybutan
- the boiling point is 110 ° C. or higher, the volatilization of the solvent is suppressed when the gate insulating material is applied, and the coating property is improved.
- the boiling point is 200 ° C. or lower, the solvent remaining in the film is small, and the chemical resistance and A gate insulating film having excellent insulating properties can be obtained. More preferably, the boiling point is 130 ° C to 190 ° C. These solvents may be used alone or in combination of two or more.
- the preferable content of these solvents is 100 to 1500 parts by weight with respect to 100 parts by weight of polysiloxane. If it is 100 parts by weight or more, the volatilization of the solvent is suppressed and the applicability is good when applying the gate insulating material, and if it is 1500 parts by weight or less, there is little solvent remaining in the film, and chemical resistance and insulation are improved. An excellent gate insulating film can be obtained.
- the gate insulating material of the present invention preferably further contains particles.
- the particles preferably have a particle diameter of 100 nm or less, more preferably 50 nm or less, from the viewpoint of the flatness of the gate insulating film. Moreover, it is preferable that it is a sol state from a compatible viewpoint with polysiloxane. More preferably, particles having a relative dielectric constant of 3 or more are preferable in order to reduce the threshold voltage (Vt) of the FET.
- Specific examples of the particles include silica particles, titania particles, barium titanate particles, zirconia particles, and barium sulfate particles.
- the gate insulating material of the present invention preferably further contains a curing agent.
- curing agent a metal alkoxide compound or a metal chelate compound is preferable, and these can also be used together.
- metal alkoxide compound examples include magnesium diethoxide, aluminum triisopropoxide, zirconia tetra (n-butoxide), zirconia tetra (t-butoxide), hafnium tetraisopropoxide, titanium tetraisopropoxide. Etc.
- a metal chelate can be easily obtained by reacting a metal alkoxide with a chelating agent.
- chelating agents that can be used include ⁇ -diketones such as acetylacetone, benzoylacetone, and dibenzoylmethane, and ⁇ -keto acid esters such as ethyl acetoacetate and ethyl benzoylacetate.
- the metal chelate compound include ethyl acetoacetate aluminum diisopropylate, aluminum tris (ethyl acetoacetate), alkyl acetoacetate aluminum diisopropylate, aluminum monoacetyl acetate bis (ethyl acetoacetate), aluminum tris ( Aluminum chelate compounds such as acetylacetonate), magnesium chelate compounds such as ethyl acetoacetate magnesium monoisopropylate, magnesium bis (ethylacetoacetate), alkylacetoacetate magnesium monoisopropylate, magnesium bis (acetylacetonate), zirconia tetrakis ( Ethyl acetoacetate), zirconia tetrakis (acetylacetonate) Etc.
- zirconia chelate compounds titanium tetrakis (ethylacetoacetate), and titanium chelate compounds such as titanium tetrakis (acetylacetonate).
- titanium tetraisopropoxide aluminum tris (acetylacetonate), aluminum tris (ethylacetoacetate), magnesium bis (acetylacetonate), magnesium bis (ethylacetoacetate), zirconia tetrakis ( Ethyl acetoacetate), zirconia tetrakis (acetylacetonate), titanium tetrakis (ethylacetoacetate), titanium tetrakis (acetylacetonate).
- titanium tetraisopropoxide aluminum tris (Acetylacetonate), aluminum tris (ethylacetoacetate), zirconia tetrakis (ethylacetoacetate), zirconia tetrakis (acetylacetonate) G), titanium tetrakis (ethylacetoacetate), titanium tetrakis (acetylacetonate) are particularly preferred.
- the content of the curing agent is preferably 0.1 to 10 parts by weight, more preferably 1 to 6 parts by weight with respect to 100 parts by weight of the polysiloxane. If the content is 0.1 parts by weight or more, curing proceeds sufficiently and a gate insulating film having good chemical resistance and insulation can be obtained. On the other hand, if it is 10 parts by weight or less, the storage stability of the gate insulating material is good.
- the gate insulating material of the present invention may further contain a compound that generates an acid by light, and in this case, has negative photosensitivity.
- a compound that generates an acid by light examples include an onium salt compound, a halogen-containing compound, a diazoketone compound, a diazomethane compound, a sulfone compound, a sulfonic acid ester compound, and a sulfonimide compound.
- onium salt compounds include diazonium salts, ammonium salts, iodonium salts, sulfonium salts, phosphonium salts, oxonium salts and the like.
- Preferred onium salts include diphenyl iodonium triflate, diphenyl iodonium pyrene sulfonate, diphenyl iodonium dodecyl benzene sulfonate, triphenyl sulfonium triflate (trade name “TPS-105”, manufactured by Minamidori Chemical Co., Ltd.), 4-t-butylphenyl diphenyl sulfonium.
- Triflate (trade name “WPAG-339” manufactured by Wako Pure Chemical Industries, Ltd.), 4-methoxyphenyl diphenylsulfonium triflate (trade name “WPAG-370” manufactured by Wako Pure Chemical Industries, Ltd.), triphenylsulfonium nonaf Rate (trade name “TPS-109” manufactured by Midori Chemical Co., Ltd.), triphenylsulfonium hexafluoroantimonate, triphenylsulfonium naphthalenesulfonate, (hydroxyphenyl) base
- TPS-109 triphenylsulfonium hexafluoroantimonate
- triphenylsulfonium naphthalenesulfonate (hydroxyphenyl) base
- Gilles methyl sulfonium toluene sulfonates Such as Gilles methyl sulfonium toluene sulfonates.
- halogen-containing compound examples include haloalkyl group-containing hydrocarbon compounds and haloalkyl group-containing heterocyclic compounds.
- Preferred halogen-containing compounds include 1,1-bis (4-chlorophenyl) -2,2,2-trichloroethane, 2-phenyl-4,6-bis (trichloromethyl) -s-triazine, and 2-naphthyl-4,6. And -bis (trichloromethyl) -s-triazine.
- diazo ketone compounds include 1,3-diketo-2-diazo compounds, diazobenzoquinone compounds, diazonaphthoquinone compounds, and the like.
- Preferred diazo ketone compounds are esters of 1,2-naphthoquinonediazide-4-sulfonic acid and 2,2,3,4,4′-tetrahydroxybenzophenone, 1,2-naphthoquinonediazide-4-sulfonic acid and 1,1, And esters with 1-tris (4-hydroxyphenyl) ethane.
- diazomethane compounds include bis (trifluoromethylsulfonyl) diazomethane, bis (cyclohexylsulfonyl) diazomethane, bis (phenylsulfonyl) diazomethane, bis (p-tolylsulfonyl) diazomethane, and bis (2,4-xylyl).
- Sulfonyl) diazomethane bis (p-chlorophenylsulfonyl) diazomethane, methylsulfonyl-p-toluenesulfonyldiazomethane, cyclohexylsulfonyl (1,1-dimethylethylsulfonyl) diazomethane, bis (1,1-dimethylethylsulfonyl) diazomethane, phenylsulfonyl ( And benzoyl) diazomethane.
- sulfone compound examples include ⁇ -ketosulfone compounds and ⁇ -sulfonylsulfone compounds.
- Preferred compounds include 4-trisphenacyl sulfone, mesityl phenacyl sulfone, bis (phenylsulfonyl) methane, and the like.
- sulfonate compound examples include alkyl sulfonate, haloalkyl sulfonate, aryl sulfonate, imino sulfonate, and the like. Specific examples include benzoin tosylate, pyrogallol trimesylate, nitrobenzyl-9,10-diethoxyanthracene-2-sulfonate, and the like.
- sulfonimide compound examples include N- (trifluoromethylsulfonyloxy) succinimide, N- (trifluoromethylsulfonyloxy) phthalimide, N- (trifluoromethylsulfonyloxy) diphenylmaleimide, N- (trifluoromethyl).
- 5-norbornene-2,3-dicarboxyimidyl triflate (trade name “NDI-105”, manufactured by Sakai Midori Chemical Co., Ltd.), 5-norbornene-2,3-dicarboxyimidyl tosylate (product) Name “NDI-101” manufactured by Minami Midori Chemical Co., Ltd.), 4-methylphenylsulfonyloxyimino- ⁇ - (4-methoxyphenyl) acetonitrile (trade name “PAI-101” manufactured by Minami Midori Chemical Co., Ltd.), trifluoromethyl Sulfonyloxyimino- ⁇ - (4-methoxyphenyl) acetonitrile (trade name “PAI-105” manufactured by Sakai Midori Chemical Co., Ltd.), 9-camphorsulfonyloxyimino ⁇ -4-methoxyphenylacetonitrile (trade name “PAI-106”) (Midori Chemical Co., Ltd.),
- TPS-105 WPAG-339, WPAG-370, TPS-109, diphenyliodonium pyrenesulfonate, NDI-105, PAI-101, and NAI-105 are particularly preferable.
- the photoacid generator can be used alone or in combination of two or more.
- the content of the photoacid generator is preferably 1 to 10 parts by weight, more preferably 1 to 7 parts by weight with respect to 100 parts by weight of the polysiloxane. If the content of the photoacid generator is 1 part by weight or more, pattern formation can be easily performed, and if it is 10 parts by weight or less, the affinity with the developer is good and the developability is good. .
- the photoacid generator is preferably used as a sensitizer in combination with a 9,10-disubstituted anthracene compound. Since the sensitizer does not cause coloration by the photobleaching reaction, even if it remains in the gate insulating film, high sensitivity can be achieved while maintaining high transparency.
- Examples of 9,10-disubstituted anthracene compounds include 9,10-diphenylanthracene, 9,10-bis (4-methoxyphenyl) anthracene, 9,10-bis (triphenylsilyl) anthracene, and 9,10-dimethoxyanthracene. 9,10-diethoxyanthracene, 9,10-dipropoxyanthracene, 9,10-dibutoxyanthracene, 9,10-dipentaoxyanthracene, 2-t-butyl-9,10-dibutoxyanthracene, 9, And 10-bis (trimethylsilylethynyl) anthracene.
- particularly preferred compounds are 9,10-dimethoxyanthracene, 9,10-diethoxyanthracene, 9,10-dipropoxyanthracene, and 9,10-dibutoxyanthracene.
- These sensitizers can be used alone or in combination of two or more.
- the content of the sensitizer is preferably 0.05 to 5 parts by weight, more preferably 0.1 to 3 parts by weight with respect to 100 parts by weight of the polysiloxane. If the content of the sensitizer is 0.05 parts by weight or more, pattern formation can be easily performed, and if it is 5 parts by weight or less, the affinity with the developer is good and the developability is good. Become.
- the sensitizer is not limited to the 9,10-disubstituted anthracene compound, and a known material can be used.
- the gate insulating material of the present invention contains a silane compound represented by the general formulas (1) and (2) and a hydrolyzate of other silane compounds, that is, silanol.
- Silanol condenses into siloxane by the action of acid or base, but when condensation progresses during storage of the gate insulating material, the viscosity increases and causes the film thickness of the coating to change.
- the change in film thickness causes variation in FET characteristics because the charge capacity in the insulating film stored when the gate voltage is applied, that is, in the ON state, changes.
- the pH of the gate insulating material it is preferable to suppress the increase in viscosity by controlling the pH of the gate insulating material to 2 to 7, preferably 3 to 6, which is a condition where the condensation rate of silanol is low.
- the pH can be examined by contacting and stirring with the same weight of water as the gate insulating material and measuring the pH of the aqueous phase.
- As the pH control method a method of washing the gate insulating material with water, a method of removing excess acid or base with an ion exchange resin, and the like are preferably used.
- the gate insulating material of the present invention can contain a viscosity modifier, a surfactant, a stabilizer and the like as required.
- surfactant examples include a fluorine-based surfactant, a silicone-based surfactant, a polyalkylene oxide-based surfactant, and an acrylic surfactant.
- fluorosurfactant examples include 1,1,2,2-tetrafluorooctyl (1,1,2,2-tetrafluoropropyl) ether, 1,1,2,2-tetrafluorooctyl. Hexyl ether, octaethylene glycol di (1,1,2,2-tetrafluorobutyl) ether, hexaethylene glycol (1,1,2,2,3,3-hexafluoropentyl) ether, octapropylene glycol di (1 , 1,2,2-tetrafluorobutyl) ether, hexapropylene glycol di (1,1,2,2,3,3-hexafluoropentyl) ether, sodium perfluorododecyl sulfonate, 1,1,2,2 , 8,8,9,9,10,10-decafluorododecane, 1,1,2,2,3,3-hexafluorodecane, N- [3- (Perf Oloocty
- silicone surfactants examples include SH28PA, SH7PA, SH21PA, SH30PA, ST94PA (all manufactured by Toray Dow Corning Silicone Co., Ltd.), BYK-333 (manufactured by Big Chemie Japan Co., Ltd.), and the like.
- examples of other surfactants include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene nonyl phenyl ether, polyoxyethylene distearate and the like.
- the surfactant content is preferably 0.0001 to 1 part by weight per 100 parts by weight of polysiloxane. Two or more surfactants may be used simultaneously.
- the gate insulating film of the present invention can be obtained by heat-treating a coating film formed by applying the gate insulating material of the present invention in the range of 100 to 300 ° C.
- Examples of the method for applying the gate insulating material include known methods such as a spin coating method, a blade coating method, a slit die coating method, a screen printing method, a bar coater method, a mold method, a printing transfer method, a dip-up method, and an inkjet method. It is done.
- a gate insulating film can be formed by heat-treating a coating film obtained by applying and drying a gate insulating material on a glass substrate or a plastic substrate by the above-described application method.
- the gate insulating film can be formed by subjecting the coating film to heat treatment after exposure and development.
- the drying temperature is preferably 50 to 150 ° C.
- the film thickness of the gate insulating film is preferably 0.01 to 5 ⁇ m, more preferably 0.05 to 1 ⁇ m.
- the heat treatment temperature is preferably in the range of 100 to 300 ° C. From the viewpoint of forming a gate insulating film on a plastic substrate, the temperature is more preferably 120 to 200 ° C.
- Actinic radiation is irradiated (exposed) from above the coating film through a mask having a desired pattern.
- a mask having a desired pattern There are ultraviolet rays, visible rays, electron beams, X-rays and the like as actinic rays used for exposure.
- actinic rays used for exposure.
- i-ray (365 nm), h-ray (405 nm), and g-ray (436 nm) of a mercury lamp are used. preferable.
- the exposed coating film is developed.
- Developers include tetramethylammonium, diethanolamine, diethylaminoethanol, sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, triethylamine, diethylamine, methylamine, dimethylamine, dimethylaminoethyl acetate, dimethylaminoethanol, dimethylaminoethyl
- An aqueous solution of an alkaline compound such as methacrylate, cyclohexylamine, ethylenediamine or hexamethylenediamine is preferable, and one or more of them may be contained.
- polar solutions such as N-methyl-2-pyrrolidone, N, N-dimethylformamide, N, N-dimethylacetamide, dimethyl sulfoxide, ⁇ -butyrolaclone, dimethylacrylamide, methanol, ethanol, isopropanol, etc.
- alcohols esters such as ethyl lactate and propylene glycol monomethyl ether acetate
- ketones such as cyclopentanone, cyclohexanone, isobutyl ketone and methyl isobutyl ketone can also be used as a mixture.
- the substrate is usually rinsed with water, but an alcohol such as ethanol or isopropyl alcohol, or an ester such as ethyl lactate or propylene glycol monomethyl ether acetate may be added to water for the rinse treatment.
- an alcohol such as ethanol or isopropyl alcohol, or an ester such as ethyl lactate or propylene glycol monomethyl ether acetate may be added to water for the rinse treatment.
- the gate insulating film of the present invention preferably has a relative dielectric constant of 3 to 50.
- the gate insulating film of the present invention preferably has a low concentration of alkali metal, alkaline earth metal, or halogen ion.
- both heavy metal and halogen ions are preferably 100 ppm or less, more preferably 1 ppm or less, and still more preferably 0.1 ppm or less of the gate insulating material.
- the FET of the present invention is an organic field effect transistor having a gate electrode, a gate insulating layer, a semiconductor layer, a source electrode and a drain electrode, and the gate insulating layer contains the gate insulating film of the present invention.
- FIG. 1 and 2 are schematic cross-sectional views showing examples of the FET of the present invention.
- a source electrode 5 and a drain electrode 6 are formed on a substrate 1 having a gate electrode 2 covered with a gate insulating layer 3 containing a gate insulating film of the present invention
- a semiconductor layer is further formed thereon. 4 is formed.
- FIG. 2 after the semiconductor layer 4 containing the organic transistor material of the present invention is formed on the substrate 1 having the gate electrode 2 covered with the gate insulating layer 3 containing the gate insulating film of the present invention, A source electrode 5 and a drain electrode 6 are formed thereon.
- Examples of the material used for the substrate 1 include inorganic materials such as silicon wafer, glass, and alumina sintered body, and organic materials such as polyimide, polyester, polycarbonate, polysulfone, polyethersulfone, polyethylene, polyphenylene sulfide, and polyparaxylene. It is done.
- inorganic materials such as silicon wafer, glass, and alumina sintered body
- organic materials such as polyimide, polyester, polycarbonate, polysulfone, polyethersulfone, polyethylene, polyphenylene sulfide, and polyparaxylene. It is done.
- Examples of materials used for the gate electrode 2, the source electrode 5, and the drain electrode 6 include conductive metal oxides such as tin oxide, indium oxide, and indium tin oxide (ITO), or platinum, gold, silver, copper, iron, Inorganic conductivity such as tin, zinc, aluminum, indium, chromium, lithium, sodium, potassium, cesium, calcium, magnesium, palladium, molybdenum, metals such as amorphous silicon and polysilicon, alloys thereof, copper iodide, copper sulfide Examples include, but are not limited to, materials, polythiophene, polypyrrole, polyaniline, and a conductive polymer whose conductivity has been improved by doping with iodine or the like, such as a complex of polyethylenedioxythiophene and polystyrenesulfonic acid. These electrode materials may be used alone, or a plurality of materials may be laminated or mixed.
- the gate insulating layer 3 contains the gate insulating film of the present invention.
- the gate insulating layer 3 is composed of a single layer or a plurality of layers. In the case of a plurality of layers, a plurality of gate insulating films of the present invention may be stacked, or a gate insulating film of the present invention and a known gate insulating film may be stacked.
- Known gate insulating films are not particularly limited, but are organic materials such as inorganic materials such as silicon oxide and alumina, polyimide, polyvinyl alcohol, polyvinyl chloride, polyethylene terephthalate, polyvinylidene fluoride, polysiloxane, and polyvinylphenol (PVP).
- the film thickness of the gate insulating layer 3 is preferably 0.01 ⁇ m or more and 5 ⁇ m or less. By setting the film thickness in this range, it is easy to form a uniform thin film, and further, the source-drain current that cannot be controlled by the gate voltage can be suppressed, and the on / off ratio of the FET can be further increased.
- the film thickness can be measured by an atomic force microscope or an ellipsometry method.
- the organic semiconductor used for the semiconductor layer 4 can be used regardless of the molecular weight as long as it is a material exhibiting semiconductivity, and can be preferably used if it is a material having high carrier mobility. Further, those soluble in an organic solvent are more preferable, and the semiconductor layer can be easily formed by applying the solution to a glass substrate or a plastic substrate.
- organic semiconductor is not particularly limited, but polythiophenes such as poly-3-hexylthiophene and polybenzothiophene, poly (2,5-bis (2-thienyl) -3,6-dipentadecylthieno [3,2 -B] thiophene), poly (4,8-dihexyl-2,6-bis (3-hexylthiophen-2-yl) benzo [1,2-b: 4,5-b ′] dithiophene), poly (4 Mainly thiophene units such as -octyl-2- (3-octylthiophen-2-yl) thiazole) and poly (5,5'-bis (4-octylthiazol-2-yl) -2,2'-bithiophene) Compounds contained in the chain, polypyrroles, poly (p-phenylene vinylenes) such as poly (p-phenylene vinylene), polyanilines, polyacetylene
- Another preferred form of the semiconductor layer 4 is a method using a composite of an organic semiconductor and a carbon nanotube (CNT). Adding CNT is preferably used as a means for improving the mobility of the organic semiconductor.
- the weight fraction of CNT contained in the composite of organic semiconductor and CNT is preferably 0.01 to 3% by weight with respect to the organic semiconductor in order to obtain semiconductor characteristics.
- the content is less than 0.01% by weight, the effect of addition is small, and when the weight fraction is more than 3% by weight, the electrical conductivity of the composite increases excessively, making it unsuitable for use as a semiconductor layer. More preferably, it is 2% by weight or less. By making it 2% by weight or less, it becomes easy to obtain both high mobility and high on / off ratio.
- the length of the CNT is preferably at least shorter than the distance (channel length) between the source electrode and the drain electrode. When longer than this, it will cause a short circuit between electrodes. For this reason, it is preferable to use a CNT whose length is at least shorter than the distance (channel length) between the source electrode and the drain electrode, or to perform a step of making the CNT shorter than the channel length.
- commercially available CNTs are distributed in length, and CNTs longer than the channel length may be included. Therefore, it is better to add a step of making the CNT shorter than the channel length, and it is possible to reliably prevent a short circuit between the electrodes.
- the average length of CNTs depends on the distance between the electrodes, but is preferably 5 ⁇ m or less, more preferably 1 ⁇ m or less.
- the diameter of the CNT is not particularly limited, but is 1 nm or more and 100 nm or less, more preferably 50 nm or less.
- CNT having a conjugated polymer attached to at least a part of its surface.
- CNT can be more uniformly dispersed in the matrix (organic semiconductor), and a high on-off ratio can be realized with high mobility.
- the state where the conjugated polymer is attached to at least a part of the surface of the CNT means a state where a part or all of the surface of the CNT is covered with the conjugated polymer.
- the reason why the conjugated polymer can coat CNT is presumed to be that interaction occurs due to the overlap of ⁇ electron clouds derived from the respective conjugated structures.
- Whether or not the CNT is coated with the conjugated polymer can be determined by approaching the color of the conjugated polymer from the color of the uncoated CNT. Quantitatively, elemental analysis such as X-ray photoelectron spectroscopy (XPS) can identify the presence of deposits and the weight ratio of deposits to CNTs.
- XPS X-ray photoelectron spectroscopy
- Pre-dispersed with a method such as adding a conjugated polymer and mixing the mixture, (IV) adding a conjugated polymer and CNT in a solvent, irradiating the mixed system with ultrasonic waves, etc. Is mentioned.
- a method such as adding a conjugated polymer and mixing the mixture, (IV) adding a conjugated polymer and CNT in a solvent, irradiating the mixed system with ultrasonic waves, etc. Is mentioned.
- any method may be used, and any method may be combined.
- Conjugated polymers covering the above CNTs include polythiophene polymers, polypyrrole polymers, polyaniline polymers, polyacetylene polymers, poly-p-phenylene polymers, poly-p-phenylene vinylene polymers, etc. However, it is not particularly limited. As the polymer, those in which single monomer units are arranged are preferably used, but those obtained by block copolymerization or random copolymerization of different monomer units are also used. Further, graft-polymerized products can also be used. Among the above-mentioned polymers, in the present invention, a polythiophene polymer that is easily attached to CNT and easily forms a CNT composite is particularly preferably used.
- the semiconductor layer 4 can be formed by a dry method such as resistance heating vapor deposition, electron beam, sputtering, CVD, etc., but from the viewpoint of manufacturing cost and adaptability to a large area, and the gate insulation of the present invention.
- a coating method in order to make use of the advantage that the repelling of the coating liquid is suppressed.
- the coating thickness control can be selected according to the properties of the coating film to be obtained, such as the orientation control. Moreover, in order to reduce the influence on a plastic substrate, it is preferable that the heat processing after solution application are 220 degrees C or less.
- the formed FET can control the current flowing between the source electrode and the drain electrode by changing the gate voltage.
- the mobility of the FET can be calculated using the following equation (a).
- Id (A) is the source-drain current
- Vsd (V) is the source-drain voltage
- Vg (V) is the gate voltage
- D (m) is the thickness of the insulating layer
- L (m) is the channel length.
- W (m) is the channel width
- ⁇ r is the relative dielectric constant of the gate insulating layer
- ⁇ is the dielectric constant of vacuum (8.85 ⁇ 10 ⁇ 12 F / m).
- the on / off ratio can be obtained from the ratio of the value of Id (on current) at a certain negative gate voltage to the value of Id (off current) at a certain positive gate voltage.
- the gate insulating material and gate insulating film of the present invention can be advantageously used in the production of various devices such as thin film field effect transistors, photovoltaic elements, and switching elements.
- a gate insulating material is applied onto a 6-inch silicon wafer and a 6-inch glass substrate using a spin coater so that the film thickness after drying is 0.5 ⁇ m, and then hot plate is used.
- SCW-636 manufactured by Dainippon Screen Mfg. Co., Ltd. was used and dried at 120 ° C. for 3 minutes to obtain a coating film.
- gate insulating film (a) Among the gate insulating materials, a gate insulating film was produced by the following method for a material having no photosensitivity. The coating film on the 6-inch silicon wafer and the 6-inch glass substrate prepared in (1) above was heat-treated at a predetermined temperature and time to obtain a gate insulating film.
- a gate insulating film was prepared by the following method for a material having photosensitivity.
- the coating film formed on the 6-inch silicon wafer and 6-inch glass substrate produced by the method described in (1) above is set on an i-line stepper (DSA-8000 made by GCA), and the exposure dose is 800 mJ / cm 2 .
- the entire coating film was exposed with.
- PEB was performed for 1 minute on a 90 ° C. hot plate, developed with a 2.38 wt% TMAH aqueous solution (ELM-D, manufactured by Mitsubishi Gas Chemical Co., Ltd.) for 60 seconds, and then rinsed with pure water.
- ELM-D 2.38 wt% TMAH aqueous solution
- the sensitivity and resolution of a coating film on a 6-inch silicon wafer produced by the method described in (2) -2 above were evaluated using an optical microscope Lambda Ace STM-602.
- the exposure amount (hereinafter referred to as the optimum exposure amount) for forming a 100 ⁇ m line-and-space pattern with a one-to-one width was defined as sensitivity, and the minimum pattern size obtained after development at the optimum exposure amount was defined as resolution.
- K C ⁇ d / ( ⁇ ⁇ S) (b) Where C (F) is the capacitance, d (m) is the insulation film thickness, ⁇ is the vacuum dielectric constant (8.85 ⁇ 10 ⁇ 12 F / m), and S (m 2 ) is the upper electrode (aluminum electrode). It is an area.
- Example 1 (1) Preparation of organic semiconductor composite solution Poly-3-hexylthiophene (residual, number average molecular weight (Mn): 13,000, hereinafter referred to as P3HT), which is a conjugated polymer, containing 5 ml of chloroform
- P3HT residual, number average molecular weight
- US-2 ultrasonic cleaner
- this solution was taken in a dropper, and 0.5 ml was dropped into a mixed solution of 20 ml of methanol and 10 ml of 0.1N hydrochloric acid to perform reprecipitation.
- the solid P3HT was collected by filtration with a 0.1 ⁇ m pore size membrane filter (PTFE: tetrafluoroethylene), rinsed well with methanol, and then the solvent was removed by vacuum drying. Further, dissolution and reprecipitation were performed again to obtain 90 mg of reprecipitation P3HT.
- PTFE tetrafluoroethylene
- single-walled CNT 1.5 mg of CNT (manufactured by CNI, single-walled CNT, purity 95%, hereinafter referred to as single-walled CNT) and 1.5 mg of the above P3HT are added to 30 ml of chloroform, and an ultrasonic homogenizer (Tokyo Rika Co., Ltd.) is cooled with ice. Using an instrument (VCX-500 manufactured by Kikai Co., Ltd.), the mixture was ultrasonically stirred at an output of 250 W for 30 minutes.
- VCX-500 manufactured by Kikai Co., Ltd.
- chloroform is added to the above dispersion A to dilute to 0.02 g / l, and filtration is performed using a membrane filter (pore size 10 ⁇ m, diameter 25 mm, Omnipore membrane manufactured by Millipore), and CNTs having a length of 10 ⁇ m or more. Was removed.
- the obtained filtrate was designated as CNT composite dispersion B.
- 0.90 mg of the following OSC-1 ([1]) as an organic semiconductor was added to a mixed solution of 0.18 ml of CNT complex dispersion B and 0.12 ml of chloroform, and an ultrasonic cleaner (US-made by Inoue Seieido Co., Ltd.) was added.
- a gate insulating material A is applied onto a 6-inch silicon wafer and a 6-inch glass substrate using a spin coater so that the film thickness after drying is 0.5 ⁇ m, and then a hot plate (Dainippon Screen) It was dried at 120 ° C. for 3 minutes using SCW-636 manufactured by Manufacturing Co., Ltd. to obtain a coating film.
- the obtained coating film was heat-treated at 200 ° C. for 60 minutes to produce a gate insulating film, and evaluated for chemical resistance and surface wettability.
- the pH of this gate insulating material A was measured and found to be 3.
- a gate electrode 2 was formed on a glass substrate 1 (film thickness 0.7 mm) by vacuum evaporation of 5 nm of chromium and 50 nm of gold through a mask by a resistance heating method.
- the gate insulating material A produced in the above (2) is spin-coated (2000 rpm ⁇ 30 seconds) on the glass substrate on which the gate electrode is formed, and the obtained coating film is applied at 200 ° C. for 1 hour in a nitrogen stream.
- the gate insulating layer 3 having a thickness of 600 nm was formed.
- gold was vacuum-deposited so as to have a film thickness of 50 nm through a mask by a resistance heating method, and the source electrode 5 and the drain electrode 6 were formed.
- the width of both electrodes was 0.5 cm, and the distance between both electrodes (channel length L) was 20 ⁇ m.
- 0.1 ml of the organic semiconductor solution X prepared in (1) above was dropped on the substrate on which the electrode was formed, and the semiconductor layer 4 having a thickness of 25 nm was formed by spin coating (800 rpm ⁇ 0.3 seconds). After attaching the lead wire to the electrode, the obtained FET was heat treated in a vacuum oven at 100 ° C. for 1 hour, slowly cooled to 50 ° C. or lower, then released to the atmosphere, and the FET was moved to the measurement box And left in vacuum.
- the source-drain current (Id) -source-drain voltage (Vsd) characteristics when the gate voltage (Vg) of the FET was changed were measured.
- the measurement was performed under vacuum using a Hewlett Packard Picoammeter / Voltage Source 4140B.
- the on / off ratio obtained from the ratio of the maximum value and the minimum value of Id at this time was 5 ⁇ 10 5 .
- the hysteresis was determined from the absolute value
- of the gate voltage difference between the return and return at Id 10 ⁇ 8 , it was 10V.
- Example 2 95.3 g (0.7 mol) of MTMSi, 24.6 g (0.1 mol) of ⁇ -EpETMSi, and 39.7 g (0.2 mol) of PhTMSi were dissolved in 183 g of PGMB, to which 55.8 g of water and 0.80 g of phosphoric acid were dissolved. Was added with stirring. The obtained solution was heated at a bath temperature of 105 ° C. for 2 hours, the internal temperature was raised to 90 ° C., and a component mainly composed of methanol produced as a by-product was distilled off. Subsequently, the bath temperature is heated at 130 ° C.
- polysiloxane B having a solid content concentration of 28.0 wt% is obtained. Obtained. 50.0 g of the obtained polysiloxane B was weighed out, 0.40 g of zirconia tetrakis (acetylacetonate) (hereinafter referred to as ZrAcAc) was added as a zirconia-based curing agent, and 21.7 g of PGMB was further mixed, at room temperature. The mixture was stirred for 2 hours to obtain a gate insulating material B. The pH of this gate insulating material B was measured and found to be 3. Next, a gate insulating film and an FET were prepared and evaluated in the same manner as in Example 1 except that the gate insulating material B was used as the gate insulating material and the coating film was heat-treated at 180 ° C. for 60 minutes.
- ZrAcAc zirconia tetrakis (acetylacetonate)
- Example 3 40.9 g (0.3 mol) of MTMSi, 73.8 g (0.3 mol) of ⁇ -EpETMSi, and 79.3 g (0.4 mol) of PhTMSi were dissolved in 231 g of propylene glycol monopropyl ether (boiling point 150 ° C., hereinafter referred to as PGMP). To this, 59.4 g of water and 0.59 g of phosphoric acid were added with stirring. The obtained solution was heated at a bath temperature of 105 ° C. for 2 hours, the internal temperature was raised to 90 ° C., and a component mainly composed of methanol produced as a by-product was distilled off. Next, the bath temperature is heated at 140 ° C.
- PGMP propylene glycol monopropyl ether
- the internal temperature is raised to 118 ° C., the components mainly composed of water are distilled off, and the mixture is cooled to room temperature to obtain polysiloxane C having a solid content concentration of 24.3% by weight. Obtained. 50.0 g of the obtained polysiloxane C was weighed, and 0.60 g of magnesium bis (acetylacetate) (trade name Nasem Magnesium, manufactured by Nippon Chemical Industry Co., Ltd., hereinafter referred to as MgAcAc) was added as a magnesium-based curing agent.
- MgAcAc magnesium bis (acetylacetate)
- DGEM diethylene glycol ethyl methyl ether
- Example 4 66.7 g (0.49 mol) of MTMSi, 2.36 g (0.01 mol) of ⁇ -glycidoxypropyltrimethoxysilane (hereinafter referred to as ⁇ -GPTMSi), 99.2 g (0.5 mol) of PhTMSi (propylene glycol monomethyl ether) It was dissolved in 471.1 g (boiling point: 121 ° C., hereinafter referred to as “PGMM”), and 54.2 g of water and 0.85 g of phosphoric acid were added thereto with stirring. The obtained solution was heated at a bath temperature of 105 ° C.
- PGMM ⁇ -glycidoxypropyltrimethoxysilane
- the internal temperature was raised to 90 ° C., and a component mainly composed of methanol produced as a by-product was distilled off.
- heating is performed at a bath temperature of 115 ° C. for 4 hours, the internal temperature is increased to 118 ° C., a component mainly composed of water and PGMM is distilled, and then cooled to room temperature, and a polysiloxane having a solid content concentration of 40.0% by weight D was obtained.
- Example 5 50.0 g of polysiloxane A having a solid content concentration of 26.0% by weight obtained in Example 1 was weighed and mixed with 16.5 g of PGMB, and photoacid generator PAI-101 (manufactured by Midori Chemical Co., Ltd.) 10 g and 0.03 g of a sensitizer 9,10-dibutoxyanthracene (Tokyo Chemical Industry Co., Ltd., hereinafter referred to as DBA) were added and stirred at room temperature for 2 hours to obtain a gate insulating material A1. The pH of this gate insulating material A1 was measured and found to be 3. Photosensitive characteristics were evaluated using the obtained gate insulating material A1. Next, a gate insulating film and an FET were prepared and evaluated in the same manner as in Example 1 except that the gate insulating material A1 was used as the gate insulating material and the coating film was heat-treated at 170 ° C. for 60 minutes.
- PAI-101 manufactured by Midori Chemical Co., Ltd.
- Example 6 Polysiloxane synthesis was performed in the same manner as in Example 1 except that 200 g (0.66 mol) of silica sol (PL-2L, manufactured by Fuso Chemical, silica particle concentration of 20% by weight) was added. Siloxane A2 was obtained. 50.0 g of the obtained polysiloxane A2 was weighed out, 1.00 g of TiTP was added, 40.0 g of PGMtB was further mixed, and the mixture was stirred at room temperature for 2 hours to obtain a gate insulating material A2. The pH of this gate insulating material A2 was measured and found to be 3. Next, a gate insulating film and an FET were prepared and evaluated in the same manner as in Example 1 except that the gate insulating material A2 was used as the gate insulating material and the coating film was heat-treated at 180 ° C. for 60 minutes.
- silica sol P-2L, manufactured by Fuso Chemical, silica particle concentration of 20% by weight
- Example 7 50.0 g of polysiloxane A having a solid content concentration of 26.0% by weight obtained in Example 1 is weighed and mixed with 16.5 g of PGMB, and photoacid generator PAI-1010.15 g and a compound having a nitrile group are obtained. 0.15 g of glutaronitrile (manufactured by Tokyo Chemical Industry Co., Ltd., hereinafter referred to as GN) was added and stirred at room temperature for 2 hours to obtain a gate insulating material A3. The pH of this gate insulating material A3 was measured and found to be 3. Next, a gate insulating film and an FET were prepared and evaluated in the same manner as in Example 5 except that the gate insulating material A3 was used as the gate insulating material and the coating film was heat-treated at 200 ° C. for 60 minutes.
- GN glutaronitrile
- Example 8 Polysiloxane was synthesized in the same manner as in Example 1 except that the solvent was isopropyl alcohol (boiling point: 82.4 ° C., hereinafter referred to as IPA) and the polycondensation heating condition was set at an internal temperature of 80 ° C. for 3 hours, and the solid content was 19.5. % Polysiloxane F was obtained. 50.0 g of the obtained polysiloxane F was weighed out, and 0.60 g of aluminum tris (ethyl acetoacetate) (trade name: ALCH-TR, manufactured by Kawaken Fine Chemical Co., Ltd., hereinafter referred to as AlTEA) was used as the aluminum-based curing agent.
- AlTEA aluminum tris
- a gate insulating material F was added and stirred at room temperature for 2 hours to obtain a gate insulating material F.
- the pH of this gate insulating material F was measured, it was 3.
- the obtained gate insulating material F was used to form a coating film with a spin coater, film unevenness was partially observed due to the low boiling point of the solvent.
- a gate insulating film and an FET were prepared and evaluated in the same manner as in Example 1 except that the gate insulating material F was used as the gate insulating material and the coating film was heat-treated at 180 ° C. for 60 minutes.
- Example 9 3-methacryloyloxypropyltrimethoxysilane Other than 56.9 g (0.3 mol) of methyltrimethoxysilane (hereinafter referred to as McTMSi), 24.6 g (0.10 mol) of ⁇ -EpETMSi, and 139 g of PhTMSi (0.6 mol) Synthesize
- McTMSi methyltri
- Example 1 was used except that 34.1 g (0.25 mol) of MTMSi, 99.2 g (0.5 mol) of PhTMSi and 30.1 g (0.25 mol) of dimethyldimethoxysilane (hereinafter referred to as DMDMSi) were used.
- DMDMSi dimethyldimethoxysilane
- a gate insulating film was prepared in the same manner as in Example 1 except that the gate insulating material H was used as a gate insulating material, and chemical resistance and surface wettability were evaluated.
- the organic semiconductor composite X was spin-coated on the gate insulating film in the previous period, but repelling occurred and the film could not be formed.
- Example 10 20.4 g (0.15 mol) of MTMSi, 39.7 g (0.2 mol) of PhTMSi, and 37.0 g (0.15 mol) of ⁇ -EpETMSi were dissolved in 88.5 g of PGMEA, to which 29.7 g of water and 0 phosphoric acid were dissolved. .39 g of the mixed solution was added with stirring. The resulting solution was heated at a bath temperature of 70 ° C. for 1 hour to distill off a component mainly composed of methanol. Next, the bath was heated at a bath temperature of 115 ° C.
- the internal temperature was raised to 110 ° C., the components mainly consisting of water were allowed to flow out, and then cooled to room temperature to obtain polysiloxane J having a solid content concentration of 48.20% by weight. Obtained. 10.0 g of the obtained polysiloxane J was weighed, 15.0 g of PGMEA and 0.25 g of ZrAcAc were added, and the mixture was stirred at room temperature for 2 hours to obtain a gate insulating material J. Next, an FET was prepared and evaluated in the same manner as in Example 1 except that the gate insulating material J was used as the gate insulating material.
- Example 11 18.4 g (0.135 mol) of MTMSi, 29.8 g (0.15 mol) of PhTMSi, and 3.70 g (0.015 mol) of ⁇ -EpETMSi were dissolved in 46.7 g of PGMEA, and 16.5 g of water and 0 phosphoric acid were dissolved therein. .21 g of the mixed solution was added with stirring. The obtained solution was heated at a bath temperature of 70 ° C. for 1 hour to distill off a component mainly composed of methanol. Next, the bath was heated at a bath temperature of 115 ° C. for 3 hours, the internal temperature was raised to 110 ° C., the components mainly composed of water were allowed to flow out, and then cooled to room temperature.
- Example 12 MTMSi 6.81 g (0.050 mol), PhTMSi 19.8 g (0.10 mol), ⁇ -EpETMSi 2.64 g (0.010 mol), polytetraethoxysilane (trade name silicate 40, manufactured by Tama Chemical Industry Co., Ltd.) 5.96 g (0.0080 mol) (hereinafter referred to as PTES) was dissolved in 32.16 g of PGMEA, and a mixed solution of 10.6 g of water and 0.14 g of phosphoric acid was added thereto with stirring. The obtained solution was heated at a bath temperature of 70 ° C. for 1 hour to distill off a component mainly composed of ethanol and methanol.
- PTES polytetraethoxysilane
- the bath was heated at a bath temperature of 115 ° C. for 3 hours, the internal temperature was raised to 110 ° C., and a component mainly composed of water was distilled off, and then cooled to room temperature, and the polysiloxane L having a solid content concentration of 43.9% by weight Got. 10.0 g of the obtained polysiloxane L was weighed, 13.0 g of PGMEA and 0.25 g of ZrAcAc were added, and the mixture was stirred at room temperature for 2 hours to obtain a gate insulating material L.
- an FET was fabricated and evaluated in the same manner as in Example 1 except that the gate insulating material L was used as the gate insulating material.
- Example 13 54.5 g (0.4 mol) of MTMSi, 24.6 g (0.1 mol) of ⁇ -EpETMSi, and 99.2 g (0.5 mol) of PhTMSi were dissolved in 160.0 g of PGMEA, and 55.9 g of water, phosphoric acid 0 .71 g was added with stirring. The obtained solution was heated at a bath temperature of 105 ° C. for 2 hours, the internal temperature was raised to 90 ° C., and a component mainly composed of methanol produced as a by-product was distilled off. Next, the bath temperature is heated at 130 ° C.
- the internal temperature is raised to 118 ° C., the components mainly composed of water are distilled off, and the mixture is then cooled to room temperature to obtain a polysiloxane M having a solid content concentration of 45.4% by weight. Obtained. 10.0 g of the obtained polysiloxane M was weighed out, 14.0 g of PGMEA and 0.25 g of ZrAcAc were added, and the mixture was stirred at room temperature for 2 hours to obtain a gate insulating material M. Next, an FET was fabricated and evaluated in the same manner as in Example 1 except that the gate insulating material M was used as the gate insulating material.
- Example 14 Polysiloxane N was synthesized in the same manner as in Example 13 except that ⁇ - (3,4-epoxycyclohexyl) ethylmethyldimethoxysilane (hereinafter referred to as ⁇ -EpEMDMSi) was used in place of ⁇ -EpETMSi, and a gate insulating material N was obtained. Produced. Next, an FET was fabricated and evaluated in the same manner as in Example 1 except that the gate insulating material N was used as the gate insulating material.
- ⁇ -EpEMDMSi ⁇ - (3,4-epoxycyclohexyl) ethylmethyldimethoxysilane
- Example 15 Polysiloxane O was synthesized in the same manner as in Example 13 except that ⁇ - (3,4-epoxycyclohexyl) propyltrimethoxysilane (hereinafter referred to as ⁇ -EpPTMSi) was used instead of ⁇ -EpETMSi. Produced. Next, an FET was manufactured and evaluated in the same manner as in Example 1 except that the gate insulating material O was used as the gate insulating material.
- ⁇ -EpPTMSi ⁇ - (3,4-epoxycyclohexyl) propyltrimethoxysilane
- Example 16 A gate insulating material P was prepared by synthesizing polysiloxane P in the same manner as in Example 13 except that ⁇ -glycidoxypropylmethyldimethoxysilane (hereinafter referred to as ⁇ -GPDMDMSi) was used instead of ⁇ -EpETMSi. Next, an FET was fabricated and evaluated in the same manner as in Example 1 except that the gate insulating material P was used as the gate insulating material.
- ⁇ -GPDMDMSi ⁇ -glycidoxypropylmethyldimethoxysilane
- Example 17 Polysiloxane Q was synthesized in the same manner as in Example 13 except that ⁇ -glycidoxyethyltrimethoxysilane (hereinafter referred to as ⁇ -GETMSi) was used in place of ⁇ -EpETMSi, and a gate insulating material Q was produced. Next, an FET was fabricated and evaluated in the same manner as in Example 1 except that the gate insulating material Q was used as the gate insulating material.
- ⁇ -GETMSi ⁇ -glycidoxyethyltrimethoxysilane
- Example 18 A polysiloxane R was synthesized in the same manner as in Example 13 except that ethyltrimethoxysilane (hereinafter referred to as ETMSi) was used in place of MTMSi to produce a gate insulating material R. Next, an FET was fabricated and evaluated in the same manner as in Example 1 except that the gate insulating material R was used as the gate insulating material.
- ETMSi ethyltrimethoxysilane
- Example 19 A gate insulating material S was prepared by synthesizing polysiloxane S in the same manner as in Example 13 except that benzyltrimethoxysilane (hereinafter referred to as BTMSi) was used instead of MTMSi. Next, an FET was fabricated and evaluated in the same manner as in Example 1 except that the gate insulating material S was used as the gate insulating material.
- BTMSi benzyltrimethoxysilane
- Example 20 A gate insulating material T was prepared by synthesizing polysiloxane T in the same manner as in Example 13 except that p-tolyltrimethoxysilane (hereinafter referred to as ToTMSi) was used instead of PhTMSi. Next, an FET was fabricated and evaluated in the same manner as in Example 1 except that the gate insulating material T was used as the gate insulating material.
- ToTMSi p-tolyltrimethoxysilane
- Example 21 Polysiloxane U was synthesized in the same manner as in Example 13 except that ⁇ -naphthyltrimethoxysilane (hereinafter referred to as NaTMSi) was used instead of PhTMSi, and a gate insulating material U was produced. Next, an FET was manufactured and evaluated in the same manner as in Example 1 except that the gate insulating material U was used as the gate insulating material.
- NaTMSi ⁇ -naphthyltrimethoxysilane
- Example 22 10.0 g of polysiloxane M obtained in Example 13 was weighed out, 15.0 g of PGMEA, 0.25 g of ZrAcAc, and 0.25 g of 3-aminopropyltriethoxysilane (hereinafter referred to as APTESi) were added, and the mixture was stirred at room temperature for 2 hours. As a result, a gate insulating material V was obtained. Next, an FET was fabricated and evaluated in the same manner as in Example 1 except that the gate insulating material V was used as the gate insulating material.
- APTESi 3-aminopropyltriethoxysilane
- Example 23 A gate insulating material W was produced in the same manner as in Example 22 except that octadecyltriethoxysilane (hereinafter referred to as OTESi) was used instead of APTESi. Next, an FET was fabricated and evaluated in the same manner as in Example 1 except that the gate insulating material W was used as the gate insulating material.
- OTESi octadecyltriethoxysilane
- Example 24 A gate insulating material X was produced in the same manner as in Example 22 except that p-trifluorophenyltriethoxysilane (hereinafter referred to as TFPhTESi) was used instead of APTESi. Next, an FET was fabricated and evaluated in the same manner as in Example 1 except that the gate insulating material X was used as the gate insulating material.
- TFPhTESi p-trifluorophenyltriethoxysilane
- Example 25 An FET was fabricated and evaluated in the same manner as in Example 13 except that the heat treatment of the insulating layer was performed at 200 ° C. for 1 hour in the air.
- Example 26 Weigh polysiloxane J5.0 g obtained in Example 10 and polysiloxane L5.0 g obtained in Example 12, add 15.0 g of PGMEA and 0.25 g of ZrAcAc, stir at room temperature for 2 hours, and gate insulation Material Y was obtained. Next, an FET was fabricated and evaluated in the same manner as in Example 1 except that the gate insulating material Y was used as the gate insulating material.
- Example 27 An FET was prepared and evaluated in the same manner as in Example 13 except that the following OSC-2 ([2]) was used as the organic semiconductor.
- Example 28 An FET was prepared and evaluated in the same manner as in Example 13 except that P3HT was used as the organic semiconductor.
- Example 29 An FET was prepared and evaluated in the same manner as in Example 15 except that CNT was not used.
- Table 1 shows the gate insulating material compositions of Examples 1 to 9 and Comparative Examples 1 and 2, and Table 3 shows the gate insulating material compositions of Examples 10 to 29.
- Table 2 shows the FET evaluation results of Examples 1 to 9 and Comparative Examples 1 and 2, and Table 4 shows the FET evaluation results of Examples 10 to 29.
- the gate insulating material and gate insulating film of the present invention are used for organic field effect transistors that can be used for transistor arrays for smart cards, security tags, flat panel displays, and other organic transistors.
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Abstract
Description
R1 m Si(OR2)4-m (1)
ここで、R1は水素、アルキル基、シクロアルキル基、複素環基、アリール基、ヘテロアリール基またはアルケニル基を示し、R1が複数存在する場合、それぞれのR1は同じでも異なっていてもよい。R2はアルキル基またはシクロアルキル基を示し、R2が複数存在する場合、それぞれのR2は同じでも異なっていてもよい。mは1~3の整数を示す。
R3 nR4 lSi(OR5)4-n-l(2)
ここで、R3は1つ以上のエポキシ基を鎖の一部に有するアルキル基またはシクロアルキル基を示し、R3が複数存在する場合、それぞれのR3は同じでも異なっていてもよい。R4は水素、アルキル基、シクロアルキル基、複素環基、アリール基、ヘテロアリール基またはアルケニル基を示し、R4が複数存在する場合、それぞれのR4は同じでも異なっていてもよい。R5はアルキル基またはシクロアルキル基を示し、R5が複数存在する場合、それぞれのR5は同じでも異なっていてもよい。lは0~2の整数、nは1または2を示す。ただし、l+n≦3である。
2 ゲート電極
3 ゲート絶縁層
4 半導体層
5 ソース電極
6 ドレイン電極
R1 m Si(OR2)4-m (1)
ここで、R1は水素、アルキル基、シクロアルキル基、複素環基、アリール基、ヘテロアリール基またはアルケニル基を示し、R1が複数存在する場合、それぞれのR1は同じでも異なっていてもよい。R2はアルキル基またはシクロアルキル基を示し、R2が複数存在する場合、それぞれのR2は同じでも異なっていてもよい。mは1~3の整数を示す。
R3 nR4 lSi(OR5)4-n-l(2)
ここで、R3は1つ以上のエポキシ基を鎖の一部に有するアルキル基またはシクロアルキル基を示し、R3が複数存在する場合、それぞれのR3は同じでも異なっていてもよい。R4は水素、アルキル基、シクロアルキル基、複素環基、アリール基、ヘテロアリール基またはアルケニル基を示し、R4が複数存在する場合、それぞれのR4は同じでも異なっていてもよい。R5はアルキル基またはシクロアルキル基を示し、R5が複数存在する場合、それぞれのR5は同じでも異なっていてもよい。lは0~2の整数、nは1または2を示す。ただし、l+n≦3である。
これらの増感剤は単独あるいは2種以上用いることもできる。増感剤の含有量は、ポリシロキサン100重量部に対して、好ましくは0.05~5重量部であり、より好ましくは0.1~3重量部である。増感剤の含有量が0.05重量部以上であれば、パターン形成を容易に行うことができ、5重量部以下であれば、現像液との親和性が良好で、現像性が良好になる。
また、増感剤としては、上記9,10-二置換アントラセン系化合物に限定されず、公知の材料を用いることができる。
ゲート絶縁層3の膜厚は0.01μm以上5μm以下が好ましい。この範囲の膜厚にすることにより、均一な薄膜形成が容易になり、さらにゲート電圧によって制御できないソース・ドレイン間電流を抑制し、FETのオンオフ比をより高くすることができる。膜厚は、原子間力顕微鏡やエリプソメトリ法などにより測定できる。
CNTに共役系重合体を付着させる方法は(I)溶融した共役系重合体中にCNTを添加して混合する方法、(II)共役系重合体を溶媒中に溶解させ、この中にCNTを添加して混合する方法、(III)CNTをあらかじめ超音波等で予備分散させておき、そこへ共役系重合体を添加し混合する方法、(IV)溶媒中に共役系重合体とCNTをいれ、この混合系へ超音波を照射して混合する方法などが挙げられる。本発明では、いずれの方法を用いてもよく、いずれかの方法を組み合わせてもよい。
ただしId(A)はソース・ドレイン間の電流、Vsd(V)はソース・ドレイン間の電圧、Vg(V)はゲート電圧、D(m)は絶縁層の厚み、L(m)はチャネル長、W(m)はチャネル幅、εrはゲート絶縁層の比誘電率、εは真空の誘電率(8.85×10-12F/m)である。
6インチシリコンウエハー上および6インチガラス基板上に、ゲート絶縁材料をスピンコーターを用いて、乾燥後の膜厚が0.5μmとなるように塗布し、ついでホットプレ-ト(大日本スクリーン製造(株)製SCW-636)を用いて、120℃で3分乾燥し、コーティング膜を得た。
ゲート絶縁材料のうち、感光性を有しない材料について、以下の方法でゲート絶縁膜を作製した。上記(1)で作製した6インチシリコンウエハー上および6インチガラス基板上のコーティング膜を、所定の温度、時間で加熱処理することにより、ゲート絶縁膜を得た。
ゲート絶縁材料のうち、感光性を有する材料について、以下の方法でゲート絶縁膜を作製した。上記(1)記載の方法で作製した6インチシリコンウエハー上および6インチガラス基板上に形成されたコーティング膜を、i線ステッパー(GCA製DSW-8000)にセットし、800mJ/cm2の露光量にてコーティング膜全面を露光した。露光後、90℃のホットプレートで1分間PEBを行い、2.38重量%のTMAH水溶液(三菱ガス化学(株)製、ELM-D)で60秒現像し、ついで純水でリンスした。この膜を、所定の温度、時間で加熱処理することにより、ゲート絶縁膜を得た。
ラムダエースSTM-602(大日本スクリーン製造(株)製)を使用し、屈折率1.55で膜厚の測定を行った。
上記(2)記載の方法で作製した6インチシリコンウエハー上のゲート絶縁膜を、25℃に温度制御されたジメチルスルホキシド/エタノール混合溶液(重量比70/30)に、30分間浸漬した。この時の浸漬前後の残膜率を算出した。この値が95~105%の場合、耐薬品性は良好といえる。残膜率は以下の式に従って算出した。
残膜率(%)=浸漬後の膜厚÷浸漬前の膜厚×100。
接触角計(協和界面科学(株)製、CA-D型)を使用し、室温下で直径1.5mmの水滴を針先に作り、これを、上記(2)記載の方法で作製した6インチシリコンウエハー上のゲート絶縁膜に触れさせて、液滴を作った。この時に生ずる液滴と面との角度を測定し、接触角とした。この接触角が90°以下の場合、表面ぬれ性は良好であるといえる。
上記(2)-2記載の方法により作製した6インチシリコンウエハー上のコーティング膜について、光学顕微鏡のラムダエースSTM-602を用いて、感度および解像度を評価した。なお、100μmのラインアンドスペースパターンを1対1の幅に形成する露光量(以下、最適露光量という)を感度とし、最適露光量における現像後に得られた最小パターン寸法を解像度とした。
ゲート絶縁材料1gに対して、1gの水を加えた。その中に、pH試験紙を浸し、その色変化によりpHを測定した。
上記(2)の方法で作製した6インチシリコンウエハー上のゲート絶縁膜上にアルミ電極を真空蒸着により形成し、LCRメーター(横河・ヒューレット・パッカード(株)製)を用いて、下記(b)式から比誘電率Kを算出した。
ただしC(F)は静電容量、d(m)は絶縁膜厚、εは真空の誘電率(8.85×10-12F/m)、S(m2)は上部電極(アルミ電極)面積である。
(1)有機半導体コンポジット溶液の作製
共役系重合体であるポリ-3-ヘキシルチオフェン(アルドリッチ社製、レジオレギュラー、数平均分子量(Mn):13000、以下P3HTという)0.10gをクロロホルム5mlの入ったフラスコの中に加え、超音波洗浄機(井内盛栄堂(株)製US-2、出力120W)中で超音波撹拌することによりP3HTのクロロホルム溶液を得た。次いでこの溶液をスポイトにとり、メタノール20mlと0.1規定塩酸10mlの混合溶液の中に0.5mlずつ滴下して、再沈殿を行った。固体になったP3HTを0.1μm孔径のメンブレンフィルター(PTFE社製:4フッ化エチレン)によって濾別捕集し、メタノールでよくすすいだ後、真空乾燥により溶媒を除去した。さらにもう一度溶解と再沈殿を行い、90mgの再沈殿P3HTを得た。
メチルトリメトキシシラン(以下MTMSiという)61.3g(0.45モル)、β-(3,4-エポキシシクロヘキシル)エチルトリメトキシシラン(以下β-EpETMSiという)12.3g(0.05モル)、およびフェニルトリメトキシシラン(以下PhTMSiという)99.2g(0.5モル)をプロピレングリコールモノブチルエーテル(沸点170℃、以下PGMBという)203.4gに溶解し、これに、水54.9g、リン酸0.864gを攪拌しながら加えた。得られた溶液をバス温105℃で2時間加熱し、内温を90℃まで上げて、主として副生するメタノールからなる成分を留出せしめた。次いでバス温130℃で2時間加熱し、内温を118℃まで上げて、主として水からなる成分を留出せしめた後、室温まで冷却し、固形分濃度26.0重量%のポリシロキサンAを得た。
図1のFETを作製した。ガラス製の基板1(膜厚0.7mm)上に、抵抗加熱法により、マスクを通してクロムを5nmおよび金を50nm真空蒸着し、ゲート電極2を形成した。次に上記(2)で作製したゲート絶縁材料Aを上記ゲート電極が形成されたガラス基板上にスピンコート塗布(2000rpm×30秒)し、得られたコーティング膜を窒素気流下200℃、1時間加熱処理することによって、膜厚が600nmのゲート絶縁層3を形成した。次に、抵抗加熱法により、マスクを通して金を膜厚50nmになるように真空蒸着し、ソース電極5およびドレイン電極6を形成した。
MTMSi95.3g(0.7モル)、β-EpETMSi24.6g(0.1モル)、PhTMSi39.7g(0.2モル)をPGMB183gに溶解し、これに、水55.8g、リン酸0.80gを攪拌しながら加えた。得られた溶液をバス温105℃で2時間加熱し、内温を90℃まで上げて、主として副生するメタノールからなる成分を留出せしめた。次いでバス温130℃で2時間加熱し、内温を118℃まで上げて、主として水からなる成分を留出せしめた後、室温まで冷却し、固形分濃度28.0重量%のポリシロキサンBを得た。得られたポリシロキサンBを50.0gはかり取り、ジルコニア系硬化剤として、ジルコニアテトラキス(アセチルアセトネート)(以下ZrAcAcという)0.40gを添加し、さらにPGMB21.7gを混合して、室温にて2時間攪拌し、ゲート絶縁材料Bを得た。このゲート絶縁材料BのpHを測定したところ、3であった。次に、ゲート絶縁材料として、ゲート絶縁材料Bを用い、コーティング膜の加熱処理を180℃で60分間としたこと以外は実施例1と同様にゲート絶縁膜およびFETを作製し、評価した。
MTMSi40.9g(0.3モル)、β-EpETMSi73.8g(0.3モル)、PhTMSi79.3g(0.4モル)をプロピレングリコールモノプロピルエーテル(沸点150℃、以下PGMPという)231gに溶解し、これに、水59.4g、リン酸0.59gを攪拌しながら加えた。得られた溶液をバス温105℃で2時間加熱し、内温を90℃まで上げて、主として副生するメタノールからなる成分を留出せしめた。次いでバス温140℃で2時間加熱し、内温を118℃まで上げて、主として水からなる成分を留出せしめた後、室温まで冷却し、固形分濃度24.3重量%のポリシロキサンCを得た。得られたポリシロキサンCを50.0gはかり取り、マグネシウム系硬化剤として、マグネシウムビス(アセチルアセテート)(商品名 ナーセムマグネシウム、日本化学産業(株)社製、以下MgAcAcという)0.60gを添加し、さらにジエチレングリコールエチルメチルエーテル(沸点176℃、以下DGEMという)12.3gを混合して、室温にて2時間攪拌し、ゲート絶縁材料Cを得た。このゲート絶縁材料CのpHを測定したところ、4であった。次に、ゲート絶縁材料として、ゲート絶縁材料Cを用い、コーティング膜の加熱処理を230℃で5分間としたこと以外は実施例1と同様にゲート絶縁膜およびFETを作製し、評価した。
MTMSi66.7g(0.49モル)、γ-グリシドキシプロピルトリメトキシシラン(以下γ-GPTMSiという)2.36g(0.01モル)PhTMSi99.2g(0.5モル)をプロピレングリコールモノメチルエーテル(沸点121℃、以下PGMMという)471.1gに溶解し、これに、水54.2g、リン酸0.85gを攪拌しながら加えた。得られた溶液をバス温105℃で2時間加熱し、内温を90℃まで上げて、主として副生するメタノールからなる成分を留出せしめた。次いでバス温115℃で4時間加熱し、内温を118℃まで上げて、主として水とPGMMからなる成分を留出せしめた後、室温まで冷却し、固形分濃度40.0重量%のポリシロキサンDを得た。得られたポリシロキサンDを50.0gはかり取り、チタンテトライソプロポキシド(以下TiTPという)1.00gを添加し、さらにプロピレングリコールモノ-t-ブチルエーテル(沸点143℃、以下PGMtBという)52.5gを混合して、室温にて2時間攪拌し、ゲート絶縁材料Dを得た。このゲート絶縁材料CのpHを測定したところ、3であった。次に、ゲート絶縁材料として、ゲート絶縁材料Dを用いたこと以外は実施例1と同様にゲート絶縁膜およびFETを作製し、評価した。
実施例1で得られた固形分濃度26.0重量%のポリシロキサンAから50.0gはかり取り、PGMB16.5gを混合し、光酸発生剤 PAI-101(みどり化学(株)製)0.10gと増感剤の9,10-ジブトキシアントラセン(東京化成工業(株)製、以下DBAという)0.03gを添加し、室温にて2時間攪拌、ゲート絶縁材料A1を得た。このゲート絶縁材料A1のpHを測定したところ、3であった。得られたゲート絶縁材料A1を用いて、感光特性について評価した。次に、ゲート絶縁材料として、ゲート絶縁材料A1を用い、コーティング膜の加熱処理を170℃で60分間としたこと以外は実施例1と同様にゲート絶縁膜およびFETを作製し、評価した。
シリカゾル(PL-2L、扶桑化学製、シリカ粒子濃度20重量%)を200g(0.66モル)加えた以外は、実施例1と同様にポリシロキサン合成を行い、固形分濃度35重量%のポリシロキサンA2を得た。得られたポリシロキサンA2を50.0gはかり取り、TiTP1.00gを添加し、さらにPGMtB40.0gを混合して、室温にて2時間攪拌し、ゲート絶縁材料A2を得た。このゲート絶縁材料A2のpHを測定したところ、3であった。次に、ゲート絶縁材料として、ゲート絶縁材料A2を用い、コーティング膜の加熱処理を180℃で60分間としたこと以外は実施例1と同様にゲート絶縁膜およびFETを作製し、評価した。
実施例1で得られた固形分濃度26.0重量%のポリシロキサンAから50.0gはかり取り、PGMB16.5gを混合し、光酸発生剤 PAI-1010.15gと、ニトリル基を有する化合物としてグルタロニトリル(東京化成工業(株)製、以下GNという)0.15gを添加し、室温にて2時間攪拌、ゲート絶縁材料A3を得た。このゲート絶縁材料A3のpHを測定したところ、3であった。次に、ゲート絶縁材料として、ゲート絶縁材料A3を用い、コーティング膜の加熱処理を200℃で60分間としたこと以外は実施例5と同様にゲート絶縁膜およびFETを作製し、評価した。
溶媒をイソプロピルアルコール(沸点82.4℃、以下IPAという)、重縮合加熱条件を内温80℃3時間とした以外は、実施例1と同様にしてポリシロキサンを合成し、固形分19.5%のポリシロキサンFを得た。得られたポリシロキサンFを50.0gはかり取り、アルミニウム系硬化剤として、アルミニウムトリス(エチルアセトアセテート)(商品名 ALCH-TR、川研ファインケミカル(株)社製、以下AlTEAという)0.60gを添加し、室温にて2時間攪拌し、ゲート絶縁材料Fを得た。このゲート絶縁材料FのpHを測定したところ、3であった。得られたゲート絶縁材料Fを用いて、スピンコーターにてコーティング膜を形成させたところ、溶媒の沸点が低いために膜ムラが一部に見られた。次に、ゲート絶縁材料として、ゲート絶縁材料Fを用い、コーティング膜の加熱処理を180℃で60分間としたこと以外は実施例1と同様にゲート絶縁膜およびFETを作製し、評価した。
3-メタクリロイルオキシプロピルトリメトキシシランメチルトリメトキシシラン(以下McTMSiという)56.9g(0.3モル)、β-EpETMSi24.6g(0.10モル)、およびPhTMSi139g(0.6モル)とした以外は、実施例1と同様にしてポリシロキサンを合成し、固形分26.0%のポリシロキサンGを得た。得られたポリシロキサンGを50.0gはかり取り、PGMB16.6g、AlTEA0.60gを添加し、室温にて2時間攪拌し、ゲート絶縁材料Gを得た。このゲート絶縁材料GのpHを測定したところ、3であった。次に、ゲート絶縁材料として、ゲート絶縁材料Gを用いたこと以外は実施例1と同様にゲート絶縁膜およびFETを作製し、評価した。
MTMSi34.1g(0.25モル)、PhTMSi99.2g(0.5モル)およびジメチルジメトキシシラン(以下DMDMSiという)30.1g(0.25モル)を用いたこと以外は、実施例1と同様にしてポリシロキサンを合成し、固形分濃度26.5重量%のポリシロキサンHを得た。
次に、ゲート絶縁材料として、ゲート絶縁材料Hを用いたこと以外は実施例1と同様にゲート絶縁膜を作製し、耐薬品性、表面ぬれ性について評価を行った。また、有機半導体コンポジットXを前期ゲート絶縁膜上にスピンコートしたが、はじきが生じてしまい、膜形成できなかった。
ポリビニルフェノール(アルドリッチ社製、重量平均分子量(Mw):20000、以下PVPという)、ポリメラミンコホルムアルデヒド(アルドリッチ社製、数平均分子量(Mn):432、以下PMFという)およびプロピレングリコールモノメチルエーテルアセテート(沸点:146℃、アルドリッチ社製、以下PGMEAという)を、PVP:PMF:PGMEA=10:5:100の重量比で混合し、ゲート絶縁材料Iとした。
次に、ゲート絶縁材料として、ゲート絶縁材料Iを用いたこと以外は実施例1と同様にゲート絶縁膜およびFETを作製し、評価した。
MTMSi20.4g(0.15モル)、PhTMSi39.7g(0.2モル)、β-EpETMSi37.0g(0.15モル)をPGMEA88.5gに溶解し、これに、水29.7gとリン酸0.39gの混合溶液を撹拌しながら加えた。得られた溶液をバス温70℃で1時間加熱し、主として副生するメタノールからなる成分を留出せしめた。ついで、バス温115℃で3時間加熱し、内温を110℃まで上げて、主として水からなる成分を流出せしめた後、室温まで冷却し、固形分濃度48.20重量%のポリシロキサンJを得た。
得られたポリシロキサンJを10.0gはかり取り、PGMEA15.0g、ZrAcAc0.25gを添加し、室温にて2時間攪拌し、ゲート絶縁材料Jを得た。
次に、ゲート絶縁材料として、ゲート絶縁材料Jを用いたこと以外は実施例1と同様にFETを作製し、評価した。
MTMSi18.4g(0.135モル)、PhTMSi29.8g(0.15モル)、β-EpETMSi3.70g(0.015モル)をPGMEA46.7gに溶解し、これに、水16.5gとリン酸0.21gの混合溶液を撹拌しながら加えた。得られた溶液をバス温70℃で1時間加熱し、主として副生するメタノールからなる成分を留出せしめた。ついで、バス温115℃で3時間加熱し、内温を110℃まで上げて、主として水からなる成分を流出せしめた後、室温まで冷却し、固形分濃度48.8重量%のポリシロキサンKを得た。
得られたポリシロキサンKを10.0gはかり取り、PGMEA15.0g、ZrAcAc0.25gを添加し、室温にて2時間攪拌し、ゲート絶縁材料Kを得た。
次に、ゲート絶縁材料として、ゲート絶縁材料Kを用いたこと以外は実施例1と同様にFETを作製し、評価した。
MTMSi6.81g(0.050モル)、PhTMSi19.8g(0.10モル)、β-EpETMSi2.64g(0.010モル)、ポリテトラエトキシシラン(商品名 シリケート40、多摩化学工業(株)製、以下PTESという)5.96g(0.0080モル)をPGMEA32.16gに溶解し、これに、水10.6gとリン酸0.14gの混合溶液を撹拌しながら加えた。得られた溶液をバス温70℃で1時間加熱し、主として副生するエタノールとメタノールからなる成分を留出せしめた。ついで、バス温115℃で3時間加熱し、内温を110℃まで上げて、主として水からなる成分を留出せしめた後、室温まで冷却し、固形分濃度43.9重量%のポリシロキサンLを得た。
得られたポリシロキサンLを10.0gはかり取り、PGMEA13.0g、ZrAcAc0.25gを添加し、室温にて2時間攪拌し、ゲート絶縁材料Lを得た。
次に、ゲート絶縁材料として、ゲート絶縁材料Lを用いたこと以外は実施例1と同様にFETを作製し、評価した。
MTMSi54.5g(0.4モル)、β-EpETMSi24.6g(0.1モル)、PhTMSi99.2g(0.5モル)をPGMEA160.0gに溶解し、これに、水55.9g、リン酸0.71gを攪拌しながら加えた。得られた溶液をバス温105℃で2時間加熱し、内温を90℃まで上げて、主として副生するメタノールからなる成分を留出せしめた。次いでバス温130℃で2時間加熱し、内温を118℃まで上げて、主として水からなる成分を留出せしめた後、室温まで冷却し、固形分濃度45.4重量%のポリシロキサンMを得た。得られたポリシロキサンMを10.0gはかり取り、PGMEA14.0g、ZrAcAc0.25gを添加し、室温にて2時間攪拌し、ゲート絶縁材料Mを得た。
次に、ゲート絶縁材料として、ゲート絶縁材料Mを用いたこと以外は実施例1と同様にFETを作製し、評価した。
β-EpETMSiの代わりにβ-(3,4-エポキシシクロヘキシル)エチルメチルジメトキシシラン(以下β-EpEMDMSiという)を用いた以外は実施例13と同様にポリシロキサンNを合成し、ゲート絶縁材料Nを作製した。
次に、ゲート絶縁材料として、ゲート絶縁材料Nを用いたこと以外は実施例1と同様にFETを作製し、評価した。
β-EpETMSiの代わりにβ-(3,4-エポキシシクロヘキシル)プロピルトリメトキシシラン(以下β-EpPTMSiという)を用いた以外は実施例13と同様にポリシロキサンOを合成し、ゲート絶縁材料Oを作製した。
次に、ゲート絶縁材料として、ゲート絶縁材料Oを用いたこと以外は実施例1と同様にFETを作製し、評価した。
β-EpETMSiの代わりにγ-グリシドキシプロピルメチルジメトキシシラン(以下γ-GPMDMSiという)を用いた以外は実施例13と同様にポリシロキサンPを合成し、ゲート絶縁材料Pを作製した。
次に、ゲート絶縁材料として、ゲート絶縁材料Pを用いたこと以外は実施例1と同様にFETを作製し、評価した。
β-EpETMSiの代わりにγ-グリシドキシエチルトリメトキシシラン(以下γ-GETMSiという)を用いた以外は実施例13と同様にポリシロキサンQを合成し、ゲート絶縁材料Qを作製した。
次に、ゲート絶縁材料として、ゲート絶縁材料Qを用いたこと以外は実施例1と同様にFETを作製し、評価した。
MTMSiの代わりにエチルトリメトキシシラン(以下ETMSiという)を用いた以外は実施例13と同様にポリシロキサンRを合成し、ゲート絶縁材料Rを作製した。
次に、ゲート絶縁材料として、ゲート絶縁材料Rを用いたこと以外は実施例1と同様にFETを作製し、評価した。
MTMSiの代わりにベンジルトリメトキシシラン(以下BTMSiという)を用いた以外は実施例13と同様にポリシロキサンSを合成し、ゲート絶縁材料Sを作製した。
次に、ゲート絶縁材料として、ゲート絶縁材料Sを用いたこと以外は実施例1と同様にFETを作製し、評価した。
PhTMSiの代わりにp-トリルトリメトキシシラン(以下ToTMSiという)を用いた以外は実施例13と同様にポリシロキサンTを合成し、ゲート絶縁材料Tを作製した。
次に、ゲート絶縁材料として、ゲート絶縁材料Tを用いたこと以外は実施例1と同様にFETを作製し、評価した。
PhTMSiの代わりにβ-ナフチルトリメトキシシラン(以下NaTMSiという)を用いた以外は実施例13と同様にポリシロキサンUを合成し、ゲート絶縁材料Uを作製した。
次に、ゲート絶縁材料として、ゲート絶縁材料Uを用いたこと以外は実施例1と同様にFETを作製し、評価した。
実施例13で得られたポリシロキサンMを10.0gはかり取り、PGMEA15.0g、ZrAcAc0.25g、3-アミノプロピルトリエトキシシラン(以下APTESiという)0.25gを添加し、室温にて2時間攪拌し、ゲート絶縁材料Vを得た。
次に、ゲート絶縁材料として、ゲート絶縁材料Vを用いたこと以外は実施例1と同様にFETを作製し、評価した。
APTESiの代わりにオクタデシルトリエトキシシラン(以下OTESiという)を用いた以外は実施例22と同様にゲート絶縁材料Wを作製した。
次に、ゲート絶縁材料として、ゲート絶縁材料Wを用いたこと以外は実施例1と同様にFETを作製し、評価した。
APTESiの代わりにp-トリフルオロフェニルトリエトキシシラン(以下TFPhTESiという)を用いた以外は実施例22と同様にゲート絶縁材料Xを作製した。
次に、ゲート絶縁材料として、ゲート絶縁材料Xを用いたこと以外は実施例1と同様にFETを作製し、評価した。
絶縁層の加熱処理を大気中200℃、1時間とした以外は実施例13と同様にFETを作製し、評価した。
実施例10で得られたポリシロキサンJ5.0gと実施例12で得られたポリシロキサンL5.0gをはかり取り、PGMEA15.0g、ZrAcAc0.25gを添加し、室温にて2時間攪拌し、ゲート絶縁材料Yを得た。
次に、ゲート絶縁材料として、ゲート絶縁材料Yを用いたこと以外は実施例1と同様にFETを作製し、評価した。
有機半導体として下記OSC-2([2])を用いた以外は実施例13と同様にFETを作製し、評価した。
有機半導体としてP3HTを用いた以外は実施例13と同様にFETを作製し、評価した。
CNTを用いなかったこと以外は実施例15と同様にしてFETを作製し、評価した。
Claims (10)
- 少なくとも、一般式(1)で表されるシラン化合物、および、一般式(2)で表されるエポキシ基含有シラン化合物、を共重合成分とするポリシロキサンを含有することを特徴とするゲート絶縁材料。
R1 m Si(OR2)4-m (1)
ここで、R1は水素、アルキル基、シクロアルキル基、複素環基、アリール基、ヘテロアリール基またはアルケニル基を示し、R1が複数存在する場合、それぞれのR1は同じでも異なっていてもよい。R2はアルキル基またはシクロアルキル基を示し、R2が複数存在する場合、それぞれのR2は同じでも異なっていてもよい。mは1~3の整数を示す。
R3 nR4 lSi(OR5)4-n-l(2)
ここで、R3は1つ以上のエポキシ基を鎖の一部に有するアルキル基またはシクロアルキル基を示し、R3が複数存在する場合、それぞれのR3は同じでも異なっていてもよい。R4は水素、アルキル基、シクロアルキル基、複素環基、アリール基、ヘテロアリール基またはアルケニル基を示し、R4が複数存在する場合、それぞれのR4は同じでも異なっていてもよい。R5はアルキル基またはシクロアルキル基を示し、R5が複数存在する場合、それぞれのR5は同じでも異なっていてもよい。lは0~2の整数、nは1または2を示す。ただし、l+n≦3である。 - 前記一般式(1)におけるm個のR1の少なくとも1つがアリール基またはヘテロアリール基である請求項1記載のゲート絶縁材料。
- 前記ポリシロキサン中、一般式(2)で表されるエポキシ基含有シラン化合物に由来する構成単位の含有量が0.1~40モル%である請求項1または2記載のゲート絶縁材料。
- さらに1気圧における沸点が110~200℃の溶媒を含有する請求項1~3いずれかに記載のゲート絶縁材料。
- さらに粒子を含有する請求項1~4いずれかに記載のゲート絶縁材料。
- さらに硬化剤として金属アルコキシド化合物および/または金属キレート化合物を含有する請求項1~5いずれかに記載のゲート絶縁材料。
- さらに光により酸を発生する化合物を含有する請求項1~6いずれかに記載のゲート絶縁材料。
- pHが2~7である請求項1~7いずれかに記載のゲート絶縁材料。
- 請求項1~8いずれかに記載のゲート絶縁材料を塗布することにより形成したコーティング膜を100℃~300℃の範囲で熱処理して得られるゲート絶縁膜。
- 請求項9記載のゲート絶縁膜を含有するゲート絶縁層、およびゲート電極、半導体層、ソース電極、およびドレイン電極を有する有機電界効果型トランジスタ。
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Also Published As
Publication number | Publication date |
---|---|
TWI553927B (zh) | 2016-10-11 |
CN102089870A (zh) | 2011-06-08 |
TW201001772A (en) | 2010-01-01 |
KR20100126407A (ko) | 2010-12-01 |
CN102089870B (zh) | 2013-08-28 |
US9048445B2 (en) | 2015-06-02 |
EP2259289A1 (en) | 2010-12-08 |
JP5407860B2 (ja) | 2014-02-05 |
JPWO2009116373A1 (ja) | 2011-07-21 |
EP2259289A4 (en) | 2013-09-04 |
US20110068417A1 (en) | 2011-03-24 |
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