WO2003089515A1 - Composition de semi-conducteur organique, element semi-conducteur organique et procede pour les produire - Google Patents
Composition de semi-conducteur organique, element semi-conducteur organique et procede pour les produire Download PDFInfo
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- WO2003089515A1 WO2003089515A1 PCT/JP2003/004824 JP0304824W WO03089515A1 WO 2003089515 A1 WO2003089515 A1 WO 2003089515A1 JP 0304824 W JP0304824 W JP 0304824W WO 03089515 A1 WO03089515 A1 WO 03089515A1
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Definitions
- the present invention relates to an organic semiconductor composition, a semiconductor element such as an organic thin film transistor and an optical sensor, and a method for producing them. Background technology
- Organic semiconductors are easier to process than inorganic semiconductors and have a high affinity with plastic supports, making them attractive as thin-layer devices.
- Japanese Patent Application Laid-Open Nos. 9-2 3 2 889 and 7-2 0 6 5 9 9 describe that the carrier mobility of the organic semiconductor layer is improved by applying an alignment film.
- organic semiconductor alignment treatment is performed by using an alignment film adjacent to the liquid crystallinity when the semiconductor polymer is heated to the melting point or higher, and the mobility of the organic semiconductor channel is improved.
- Technology to do is shown. However, in any case, a process for forming an adjacent alignment film is required, and a complicated semiconductor device is required.
- Japanese Patent Application Laid-Open No. 2 00 0-2 6 0 9 9 9 describes providing an improved FET structure using an organic / inorganic hybrid material as a semiconductor channel. Specifically, a semiconductor with high mobility using a semiconductor material by self-organization has been proposed, but a complicated procedure is actually required to actually create a semiconductor material.
- the object of the present invention is to provide an alignment treatment for an alignment film by a very simple method.
- An organic semiconductor composition that can be formed into a coating film that does not require high mobility and has a high mobility, and a semiconductor element such as an organic thin film transistor and an optical sensor using such an organic semiconductor composition.
- An organic semiconductor composition comprising fine particles and an organic semiconductor compound, wherein the fine particles and the organic semiconductor compound are bonded.
- the fine particles and the organic semiconductor compound are bonded via a sulfide group, a disulfide group, a carboxyl group, a sulfonic acid group, a sulfinic acid group, a phosphonic acid group, or a phosphoric acid group.
- a sulfide group a disulfide group, a carboxyl group, a sulfonic acid group, a sulfinic acid group, a phosphonic acid group, or a phosphoric acid group.
- organic semiconductor composition according to any one of (1) to (4), wherein the organic semiconductor compound is a 7T conjugated polymer or oligomer.
- the bonded fine particles and the regioregular poly (3-alkylthiophene) are bonded to the regioregular 3-alkylthiophene having a bonding group at the 5-position through the bonding group at the 5-position.
- the first fine particles bonded to the regioregular 3-alkylthiophene via the 5-position linking group are dispersed in a first solvent, and the regioregular 3-monoalkylthiophene and the 2-position are dispersed.
- the semiconductor element is an optical sensor having an organic semiconductor layer and two or more electrodes in contact with the organic semiconductor layer, or a gate electrode on a support, a gate insulating layer on the support, and the gate insulating layer
- An organic thin film transistor comprising an upper organic semiconductor layer, and a source electrode and a drain electrode in contact with the organic semiconductor layer, wherein the organic semiconductor layer contains fine particles and an organic semiconductor compound, and the fine particles and the organic semiconductor
- a semiconductor device comprising an organic semiconductor composition to which a compound is bonded.
- the fine particles and the organic semiconductor compound are bonded via a sulfide group, a disulfide group, a force lpoxyl group, a sulfonic acid group, a sulfinic acid group, a phosphonic acid group, or a phosphoric acid group.
- a sulfide group a disulfide group, a force lpoxyl group, a sulfonic acid group, a sulfinic acid group, a phosphonic acid group, or a phosphoric acid group.
- the bonded fine particles and regioregular poly (3-alkylthiophene) are bonded to a regioregular 3-alkylthiophene having a bonding group at the 5-position through the bonding group at the 5-position.
- Regioregular 3-alkylthio with fine particles and a linking group at the 2-position (21)
- the first fine particles bonded to the regioregular 3-alkylthiophene through the 5-position linking group are dispersed in a first solvent, and the regioregular 3-alkylthiophene and the 2-position (2)
- the organic semiconductor is dispersed in the dispersion.
- An organic semiconductor composition that forms a polymer of the organic semiconductor monomer between fine particles by adding a dimer solution to coordinate the dimer with the monomer bound to the surface of the fine particles Manufacturing method.
- FIG. 1 is a diagram schematically showing the structure of poly (3-alkylthiophene) used in the present invention.
- FIG. 2 is a schematic view showing an example of the organic thin film transistor of the present invention.
- FIG. 3 is a schematic view showing another example of the organic thin film transistor of the present invention.
- FIG. 4 is a schematic view showing still another example of the organic thin film transistor of the present invention.
- FIG. 5 is a diagram showing an example of a measurement circuit for evaluation.
- FIG. 6 is a schematic view showing an example of the optical sensor of the present invention.
- FIG. 7 is a schematic view showing another example of the optical sensor of the present invention.
- FIG. 8 is a schematic diagram showing the structure of poly (porphyrin) formed in a self-organized manner between particles.
- FIG. 9 is a schematic view showing a transistor having a configuration in which two metal fine particles are bonded at both ends of an organic semiconductor compound molecule.
- FIG. 10 is a diagram showing another example of a measurement circuit for evaluation. BEST MODE FOR CARRYING OUT THE INVENTION
- the organic semiconductor composition of the present invention is characterized by containing an organic semiconductor compound bonded to fine particles.
- the organic semiconductor compound known compounds can be used, but 7T conjugated polymers or oligomers are preferable. Of these, polythiophene derivatives are particularly preferable.
- the polythiophene derivative is more preferably a derivative containing a regioregular poly (3-alkylthiophene) structure (hereinafter simply referred to as a regioregular poly (3-alkylthiophene) derivative). More preferably, location rules
- the alkyl group of the poly (3-alkylthiophene) derivative is an alkyl group having 4 to 15 carbon atoms.
- the fine particles are preferably metal fine particles.
- the fine particles and the organic semiconductor compound are preferably bonded via a sulfide group, a disulfide group, a carboxyl group, a sulfonic acid group, a sulfinic acid group, a phosphonic acid group, or a phosphoric acid group, and more preferably It is bonded via a sulfide group.
- the bonded fine particles and the organic semiconductor compound are preferably dispersed in a solvent.
- the fine particles self-organize to form an array structure, preferably a finely packed (hexagonal packing) structure.
- the carrier mobility can be further increased without using an alignment film.
- the bonded fine particles and regioregular poly (3-alkylthiophene) are dispersed in a solvent.
- the solvent is preferably a solvent in which regioregular poly (3-alkylthiophene) can be dissolved.
- a preferred organic semiconductor composition of the present invention is such that the bonded fine particles and regioregular poly (3-alkylthiophene) are bonded to a regioregular 3-alkylthiophene having a bonding group at the 5-position at the first position.
- the organic semiconductor composition is a mixture of a fine particle and a regioregular 3-alkylthiophene having a bonding group at the 2-position and a second fine particle bonded at the 2-position.
- the organic semiconductor composition has a bonding group at the 5-position.
- the first fine particles bonded to the regioregular 3-alkylthiophene having the 5-position are dispersed in the first solvent and bonded to the regioregular 3-alkylthiophene having a bonding group at the 2-position at the 2-position.
- the second fine particles are obtained by dispersing in the second solvent and mixing the two dispersions.
- the semiconductor element of the present invention has an organic semiconductor layer containing the organic semiconductor composition of the present invention and two or more electrodes in contact therewith.
- the semiconductor element of the present invention is preferably used as an optical sensor.
- the semiconductor element of the present invention comprises an organic semiconductor layer containing the organic semiconductor composition of the present invention and two or more electrodes in contact with the organic semiconductor layer.
- the organic thin film transistor of the present invention comprises a gate electrode on a support, a gate insulating layer on the support, a semiconductor channel on the gate insulating layer, and a source electrode and a drain electrode in contact with the semiconductor channel.
- the semiconductor channel includes the organic semiconductor composition of the present invention.
- polypyrroles such as polypyrrole, poly (N-substituted pyrrole), poly (3-substituted pyrrole), poly (3,4-disubstituted pyrrole), polythiophene, poly (3-substituted thiophene), Poly (3, 4-disubstituted thiophene), polythiophenes such as polybenzothiophene, polyporphyrins such as polyvolphyrin, poly (imidazolyl porphyrin metal complex), polyisothianaphthenes such as polyisothianaphthene, polydiethylene vinylene Polyethylene vinylenes such as Poly (p-Phenylenevinylene) Poly (p-Phenylenevinylene), Polyaniline, Poly (N-Substituted Vanillin), Poly (3-Substituted
- thiophene hexamer sexitothiophene ⁇ , ⁇ —dihexylate ⁇ — sexitothiophene, ⁇ -dihexileu monokinchethiophene, ⁇ -bis (3-butoxy (Propyl) Ichiichi Oligomers such as succitiphene and styrylbenzene derivatives can also be suitably used.
- copper phthalocyanine is a metal phthalocyanine such as fluorine-substituted copper phthalocyanine described in JP-A-11-251516, naphthalene 1,4,5,8-tetracarboxylic acid diimide, ⁇ , ⁇ , —bis (4 monotrifluoromethylbenzyl) naphthalene 1, 4, 5, 8— with tetracarboxylic acid diimide, ⁇ , ⁇ , 1 bis (1 ⁇ , 1 ⁇ -perfluorooctyl), ⁇ , ⁇ , 1 Bis (1 ⁇ , 1 ⁇ _perfluoroptyl) and ⁇ , N '— dioctylnaphthalene 1,4,5,8-tetracarboxylic acid diimide derivatives, naphthalene 2, 3, 6, 7 Naf Thalene tetra-force sulfonic acid diimides, and anthracene 2, 3, 6, 7-tetra-force condensed rings such as anth
- organic semiconductor materials include tetrathiafulvalene (TTF) -tetracyanoquinodimethane (TCNQ) complex, bisethylenetetrathiafulvalene (BEDTTTF) —perchloric acid complex, BEDTTT F—iodine complex, TCNQ—iodine complex
- TTF tetrathiafulvalene
- TCNQ bisethylenetetrathiafulvalene
- BEDTTT F iodine complex
- TCNQ iodine complex
- Organic molecular complexes such as can also be used.
- organic / inorganic hybrid materials described in JP-A-2000-260999 can also be used for ⁇ -conjugated polymers such as polysilane and polygermane.
- thiophene, vinylene, chelenylene vinylene, phenylene vinylene, ⁇ -phenylene, their substitutions or two or more of these are used as repeating units, and the number of repeating units ⁇ Is preferably at least one selected from the group consisting of oligomers having a number of repeating units of -15, polymers having a repeating unit ⁇ of 20 or more, and condensed polycyclic aromatic compounds such as pencene.
- a material in which a substituent such as a C 4 -C 15 alkyl group is added to at least one of the repeating units to form a three-dimensional regular structure is preferable. Addition of substituents such as alkyl groups enhances the solubility of organic semiconductor materials in organic solvents, and gives regularity to the higher-order structure of the polymer when an organic semiconductor layer is formed by forming an ordered structure. be able to.
- regioregular poly (3-alkylthiophene) is preferable.
- the orientation of the alkyl group (R group) of a given thiophene moiety is regular with respect to adjacent thiophene moieties on the polymer chain. Ie polymer backbone For two adjacent thiophene moieties given in, the alkyl groups of the thiophene moiety are arranged so that only one alkyl group is oriented in the space between these two thiophene moieties. Most thiophene moieties in the polymer have this “regular” oriented alkyl group. However, it is considered appropriate if at least 95 percent of the thiophene moiety is a regioregular 3-alkylthiophene polymer (or oligomer or derivative thereof) having an alkyl group of such orientation.
- the alkyl group (R) is an alkyl group having 4 to 15 carbon atoms, and if it is less than 4, the solubility in an organic solvent decreases, and if it exceeds 15, the ordered structure tends to be disturbed.
- the number of repeating units of the thiophene ring is 2 to 50, preferably 4 to 15. Furthermore, it is preferable to mix thiophene rings having different numbers of repeating units and use, for example, a regioregular 3-alkylthiophene polymer of about 4 to 6 and a regioregular 3-alkylthiophene polymer of about 7 to 15 together.
- the organic semiconductor compound used in the present invention has an arbitrary bonding group having binding properties to the fine particles at at least one position of the end of the molecule.
- an arbitrary substituent having a binding property to the fine particles include a sulfide group, a disulfide group, a strong lpoxyl group, a sulfonic acid group, a sulfinic acid group, a phosphonic acid group, and a phosphoric acid group, and a sulfide group is preferable.
- thiol group when bonding to fine metal particles such as gold, silver, platinum, etc., thiol group, methylthio group (-SCH 3 ), mercaptothio group (-S-SH), methyl mercaptothio group (-S-SCH 3 ), Using an organic semiconductor compound having a acetylyl group (-SAc) or the like at its terminal, it is bonded to the surface of the metal fine particle by a sulfide bond based on the compound. Alternatively, a dimer or multimer of molecules bonded via a disulfide bond may be bound to the metal particle.
- the organic semiconductor compound used in the present invention is preferably one in which regioregular poly (3-alkylthiophene) and fine particles are bonded, and the regioregular poly (3-alkylthiophene) is represented by the following general formula ( 1) Poly (3-alkylthiophene) having a group that binds to fine particles at the 5-position of the terminal thiophene unit represented by formula (2) and fine particles bonded to the 2-position of the terminal thiophene unit represented by formula (2) It is preferable to use poly (3-alkylthiophene) having a group capable of General formula (1) General formula (2)
- R represents a substituted or unsubstituted alkyl group or alkoxyalkyl group having 4 to 15 carbon atoms
- R ′ represents a hydrogen atom or an arbitrary substituent, and the optional substituent is preferably a substituted or non-substituted group.
- R ′ ′ represents a hydrogen atom, a methyl group, a acetyl group, a mercapto group, or a methyl mercapto group.
- N represents an integer of 2 to 50.
- X represents a divalent linking group, preferably an alkylene group or an arylene group, more preferably methylene, ethylene or propylene.
- m is 0 or 1.
- the poly (3-alkylthiophene) represented by the general formula (1) is schematically shown in Fig. 1 (a).
- the poly (3_alkylthiophene) represented by the general formula (2) can be represented as shown in Fig. 1 (b). Therefore, it is considered that the organic semiconductor composition of the present invention when the poly (3-alkylthiophene) represented by the general formulas (1) and (2) is used together has a structure as shown in FIG. 1 (c).
- reference numeral 1 denotes a ⁇ conjugate plane consisting of a thiophene nucleus
- reference numeral 2 denotes an alkyl portion of R
- reference numeral 3 denotes a portion that binds to a fine particle represented by SH.
- the symbol 4 represents the fine particle part represented by gold.
- the semiconductor composition of the present invention for example, after preparing a solvent dispersion of fine particles in which the monomer of the organic semiconductor having a bonding group to the fine particles is bonded via the bonding group, A method of forming a polymer of the monomer of the organic semiconductor between the particles by adding a solution composed of the dimer of the organic semiconductor and coordinating with the monomer aligned with the surface of the fine particle is used. .
- an imidazolyl porphyrin monomer having a bonding group to the above-mentioned fine particles for example, Compound P-1 below
- a polyvorphyrin solution consisting of an imidazolyl porphyrin dimer for example, Compound P_ 2 below
- a method of forming polyporphyrin between particles is used.
- an imidazolyl porphyrin monomer having a binding group to a fine particle for example, the following compound P-1
- a polyporphyrin composed of an imidazolyl porphyrin dimer for example, the following compound P-2
- a method may be used in which a solution of bonded polyporphyrin is prepared and bonded to fine particles.
- poly (porphyrin) formed in a self-organized manner between the particles forms a one-dimensional conductive path.
- Figure 8 shows this self-organized structure. In FIG.
- 1 ⁇ is alkyl (eg, methyl, ethyl, propyl) or aryl (eg, phenyl, naphthyl), M is Zn, Ga, Fe, or Co, X is arylene (eg, , Phenylene) or alkylene (eg, methylene, ethylene, propylene). Details regarding the synthesis method and coordination control of these poly (porphyrins) are disclosed in JP-A-2001-253883 and JP-A-2001-213883.
- organic semiconductor compounds other than porphyrin derivatives are listed below.
- R hexyl or talent
- R hexyl or talent
- a known synthesis method can be applied to the method for introducing a group capable of binding to fine particles into the organic semiconductor compound of the present invention.
- a method for producing an SH group at the end of an aromatic ring J. Org. Ch em.; EN; 6 0; 7; 1 9 9 5; 2 0 8 2-2 0 9 1.
- the fine particles fine particles of metals, inorganic oxides, inorganic nitrides, polymers and the like are used, and metal fine particles are preferable.
- the metal particles of the present invention include platinum, gold, silver, nickel, chromium, copper, iron, tin, tantalum, indium, cobalt, palladium, tellurium, rhenium, iridium, aluminum, ruthenium, germanium, molybdenum, Tungsten, zinc, etc. can be used.
- platinum, gold, silver, copper, conoleto, chromium, iridium, nickel, palladium, molybdenum, and tungsten having a work function of 4.5 eV or more are preferable.
- Such metal fine particles can be produced by reducing metal ions in the liquid phase, such as in-gas evaporation, sputtering, and metal vapor synthesis, colloidal methods, and coprecipitation methods.
- Examples of the chemical production method for producing metal fine particles include the colloidal method described in JP-A-11-76800, JP-A-11-80647, JP-A-2000-239853, and the like. 254185, JP 2001-53028, JP 2001-35814, JP 2001-35255, JP 2000-124157, JP 2000-123634, and the like.
- the inorganic oxide fine particles include fine particles of silicon oxide, titanium oxide, aluminum oxide and the like. Such an inorganic oxide may be a sol.
- the size of the fine particles is arbitrary, but is 0.1 nm to lm, preferably 1 to 100 nm. In order to function well as a semiconductor material, it is preferable that the surface is smooth.
- the size of the fine particles here is the diameter in the case of spherical fine particles, In the case of fine particles having a shape other than a sphere, the diameter is a circle image having the same area as the projected image.
- the semiconductor channel contains an organic semiconductor compound bonded to metal fine particles, but the content of the metal fine particles varies depending on the metal used, but is generally 30 to 5000 per 100 parts by mass of the organic semiconductor compound. Part by mass.
- the organic semiconductor layer is formed using the organic semiconductor composition.
- the organic semiconductor layer may be subjected to doping treatment.
- Doping means introducing an electron-donating molecule (first sector) or an electron-donating molecule (donor) into the thin film as a dopant. Therefore, the doped thin film is a thin film containing the condensed polycyclic aromatic compound and the dopant.
- Either an acceptor or a donor can be used as the dopant.
- C 1 2 as the Akuse flop evening one, B r 2, I 2, IC 1, IC 1 3, IB r, halogen such as IF, PF 5, As F 5 , SbF 5, BF 3, BC 1 3, BB r 3, a Lewis acid such as S_ ⁇ 3, HF, HC 1, HN0 3, H 2 S0 4, HC 10 4, FS0 3 H, C 1 S_ ⁇ 3 H, protonic acids such as CF 3 S 0 3 H, acetic acid, formic acid, organic acids such as amino acids, FeC l 3, FeO C l , T i C l 4, Z r C l 4, Hf C l 4, NbF 5, NbC l 5, TaC ", Mo C 1 5, Transition metal compounds such as WF 5 , WC 16 , UF 6 , LnC "(Ln La, Ce, Nd, Pr, and other lanthanoids and Y), CI—,
- Li, Na, K, Rb, Cs, etc. Alkali metals, alkaline earth metals such as Ca, Sr, Ba, rare earth metals such as Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb Ammonium ions, R 4 P +, R 4 As + , R 3 S +, acetylcholine and the like can be mentioned.
- a method for doping these dopants either an organic semiconductor thin film is prepared in advance and a dopant is introduced later, or a dopant is introduced at the time of organic semiconductor thin film preparation can be used.
- doping efficiency can be adjusted by applying electrolysis.
- a mixed solution or dispersion of an organic semiconductor compound and a dopant may be applied and dried simultaneously.
- the dopant can be introduced by co-evaporating the dopant with the organic semiconductor compound.
- a dopant can be introduced into the thin film by sputtering using a binary target of an organic semiconductor compound and a dopant.
- Still other methods include chemical doping such as electrochemical doping, photoinitiation doping, and ion implantation shown in the publication (Industrial Materials, Vol. 34, No. 4, p. 55, 1986). Any physical doping can be used.
- Examples of the method for forming the organic semiconductor layer include coating methods such as spray coating, spin coating, blade coating, dip coating, casting, mouth coating, bar coating, and die coating.
- the coating solution used to form the organic semiconductor layer is It is the dispersion liquid which disperse
- the type of organic solvent used for dispersion is appropriately selected from a wide range of organic solvents such as hydrocarbon-based, alcohol-based, ether-based, ester-based, keton-based, and glycol ether-based depending on the organic semiconductor compound.
- the dispersion liquid can be formed by flying by an ink jet method. According to this method, the active semiconductor layer C can be efficiently formed in a narrow groove between the source electrode S and the drain electrode D as shown in FIG.
- the film thickness of the semiconductor layer is preferably in the range of 5 nm to 1 m, more preferably 10 nm to 100 nm.
- a gate electrode, a source electrode, and a drain electrode are required as electrodes.
- materials known as organic thin film transistors can be applied. Specifically, platinum, gold, silver, nickel, chromium, copper, iron, tin, antimony lead, tantalum, indium, palladium, tellurium, rhenium, iridium, aluminum, ruthenium, germanium, molybdenum, tungsten, oxide Tin, antimony, indium oxide, tin (ITO), fluorinated zinc oxide, zinc, carbon, graphite, glassy carbon, silver paste and carbon paste, lithium, beryllium, sodium, magnesium, potassium , Calcium, scandium, titanium, manganese, zirconium, gallium, niobium, sodium, sodium monopotassium alloy, magnesium, lithium, aluminum, magnesium-copper mixture, magne Sum Z silver mixture, magnesium / aluminum mixture,
- conductive polymers whose conductivity has been improved by doping or the like, for example, conductive polyaniline, conductive polypyrrole, conductive polythiophene, or a complex of polyethylenedioxythiophene and polystyrene sulfonic acid are also suitable. Used for. Of the above-described source electrodes and drain electrodes, those having low electrical resistance on the contact surface with the semiconductor layer are preferable.
- the semiconductor element of the present invention when used as an optical sensor, at least two electrodes are necessary.
- the electrode for the optical sensor the materials described in the above gate electrode, source electrode, and drain electrode can be used.
- a method of forming an electrode As a method of forming an electrode, a method of forming an electrode using a known photolithographic method or a lift-off method with a conductive thin film formed using a method such as vapor deposition or sputtering using the above as a raw material, or a metal such as aluminum or copper There is a method of etching using a resist by thermal transfer, ink jet or the like on the foil.
- the conductive polymer solution, dispersion, or conductive fine particle dispersion may be patterned directly by ink jetting, or may be formed from the coating film by lithography or laser ablation.
- a method of patterning an ink containing a conductive polymer or conductive fine particles, a conductive paste, or the like by a printing method such as relief printing, intaglio printing, planographic printing, or screen printing can also be used.
- a signal line, a scanning line, and a display electrode are provided, and the above-described materials and forming methods can be applied.
- a gate insulating layer is provided.
- Various insulating films can be used as the gate insulating layer.
- an inorganic oxide film having a high specific dielectric constant is preferable.
- Inorganic oxides include silicon oxide, aluminum oxide, tantalum oxide, titanium oxide, tin oxide, vanadium oxide, barium strontium titanate, barium zirconate titanate, lead zirconate titanate, lead titanate Examples include lanthanum, strontium titanate, barium titanate, magnesium barium fluoride, bismuth titanate, strontium bismuth titanate, strontium bismuth tantalate, bismuth tantalate niobate, and yttrium trioxide. Of these, preferable are silicon oxide, aluminum oxide, tantalum oxide, and titanium oxide. Inorganic nitrides such as silicon nitride and aluminum nitride can also be suitably used.
- the film formation methods include vacuum deposition, meridian epitaxy, ion class evening beam, low energy ion beam, ion plating, CVD, sputtering, atmospheric pressure plasma, etc.
- Coating processes such as spray coating, spray coating, spin coating, blade coating, dip coating, casting, roll coating, bar coating, and die coating, printing and ink jet, etc.
- a wet process such as a patterning method can be used, and it can be used according to the material.
- the wet process includes a method of applying and drying a liquid in which fine particles of inorganic oxide are dispersed in an arbitrary organic solvent or water using a dispersion aid such as a surfactant as necessary, or an oxide precursor, for example, A so-called sol-gel method in which an alkoxide solution is applied and dried is used.
- a so-called sol-gel method in which an alkoxide solution is applied and dried is used.
- Aluminum oxide, tantalum oxide, and the like can be formed by a known anodic oxidation method. Of these, the atmospheric pressure plasma method and the anodic oxidation method are preferred.
- a method for forming an insulating film by plasma film formation under atmospheric pressure will be described as follows.
- the above-mentioned plasma film-forming process under atmospheric pressure refers to a process in which a reactive gas is discharged under atmospheric pressure or a pressure near atmospheric pressure, and a reactive gas is plasma-excited to form a thin film on a substrate.
- JP-A-11-133205, JP-A-2000-185362, JP-A-11-61406, JP-A-2000-147209, 2000-121804 and the like As a result, a highly functional thin film can be formed with high productivity.
- organic compound film examples include polyimide, polyamide, polyester, polyacrylate, photo-radical polymerization system, photo-curable resin of photothion polymerization system, copolymer containing acrylonitrile component, polyvinyl phenol, Polyvinyl alcohol, novolac resin, and cyanoethyl pullulan, a polymer, a phosphazene compound containing an elastomer, and the like can also be used.
- the wet process is preferred as the method for forming the organic compound film.
- An inorganic oxide film and an organic oxide film can be laminated and used together.
- the thickness of these insulating films is generally 50 nm to 3 m, preferably 100 nm to Lm.
- the support is composed of glass or a flexible resin sheet.
- a plastic film can be used as the sheet.
- the plastic film include polyethylene terephthalate, polyethylene naphthalate, polyethylene tersulfone, polyether imide, poly ether ether ketone, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, single-cell cellulose acetate, and cellulose acetate.
- a film such as propionate.
- the support is not essential when the organic semiconductor layer, the gate insulating layer, or the like is a polymer film, which is a so-called self-supporting film that also functions as a support.
- the organic semiconductor layer is preferably protected by a protective film.
- a gas barrier film such as polyvinyl alcohol or ethylene-vinyl alcohol copolymer, or an inorganic material described in the section of the gate insulating layer can be used.
- These protective films may be functional films such as an antireflection layer.
- the layer structure in which the semiconductor element of the present invention is an organic thin film transistor is shown in FIG. 2, FIG. 3, and FIG.
- the organic thin film transistor includes a gate electrode, a gate insulating layer, a semiconductor layer adjacent to the gate insulating layer, and a source electrode and a drain electrode in contact with the semiconductor layer.
- S, D, G, C, and In represent a source electrode, a drain electrode, a gate electrode, a semiconductor layer containing an organic semiconductor composition, and a gate insulating layer, respectively. Any of the methods described above may be used to make each electrode.
- the semiconductor layer containing the organic semiconductor composition in FIGS. 2, 3, and 4 is preferably the above-described ink jet method or coating method.
- FIGS. 6 a, 6 b, 7 a, 7 b are electrodes
- 6 c, 7 c are photoelectric conversion layers made of an organic semiconductor composition
- 6 d and 7 d are supports.
- ITO Indium Tin Oxide
- a transistor having the structure shown in FIG. 9 can be formed using the organic semiconductor composition of the present invention.
- An organic semiconductor compound molecule 1 0 4 is formed on the gate insulating film 1 0 2 formed on the gate electrode 1 0 1 through at least two bonding groups 1 0 5 (for example, thiol) to form two metal fine particles 1 0 3 (for example, gold fine particles) is combined, and each metal fine particle functions as a source electrode and a drain electrode.
- Transistor characteristics can be obtained by conducting conduction from each microparticle using a bonbon nanotube or SPM stylus.
- a composition was prepared in the same manner as Sample Preparation 1 except that the organic semiconductor compound was changed to sexual hexylthiophene having thiol at both ends (Exemplary Compound 3), and a black mouth form dispersion (Dispersion 2) was obtained. .
- Sample preparation 3 The black mouth form dispersion liquid prepared in Sample Preparation 1 (that is, the organic semiconductor compound of Example Compound 1) and the black mouth form dispersion liquid prepared by replacing Example Compound 1 in Sample Preparation 1 with Example Compound 2 were respectively used. A dispersion was prepared by mixing at a mass ratio of 1: 1, and the Kuroguchi form phase dispersion was thoroughly purified to obtain the Kuroguchi form dispersion (dispersion 3) of the present invention.
- a mixed dispersion (dispersion 5) was obtained in the same manner as in sample preparation 4 using chloroplatinic acid instead of chloroauric acid in sample preparation 4.
- An Au thin film of 20 OA is deposited on a polyimide film with a thickness of 150 xm and photolithography is performed.
- a source electrode and a drain electrode were respectively formed by a sography method.
- the length of the semiconductor layer containing the organic semiconductor composition (dispersion 1) was 20 im.
- the thickness of the semiconductor layer containing the organic semiconductor composition was about 5 nm.
- gate insulation of a 300 nm thick silicon oxide film is formed on the source electrode, drain electrode, and organic semiconductor film by the atmospheric pressure plasma method described above. A layer was formed. A dense film with good adhesion to the organic semiconductor film was obtained.
- a 30 m wide gate electrode was formed using a commercially available silver paste, and an organic thin film transistor (organic thin film transistor sample 1) having a layer structure shown in FIG. 2 was obtained.
- Organic thin film transistor samples 2 to 5 were prepared in the same manner as organic thin film transistor sample 1 except that dispersion 1 was replaced with dispersions 2 to 5, respectively.
- FIG. 5 shows the measurement circuit for evaluation.
- S, D, G, C, In, A, V, SW are the source electrode, drain electrode, gate electrode, semiconductor layer containing organic semiconductor composition, gate insulating layer, ammeter, variable, respectively. Indicates bias and switch. All organic thin film transistor samples performed well, and p-channel enhancement-type FET characteristics were obtained. was gotten.
- A, V and V 2 represent a source electrode, a drain electrode, a gate electrode, a semiconductor layer containing an organic semiconductor composition, a gate insulating layer, an ammeter, a gate bias, and a source drain bias, respectively.
- An organic thin film transistor was prepared and evaluated in the same manner as in Example 3 except that Dispersion 3 was used.
- the carrier mobility in the saturation region was 0.11.
- Poly (3-hexylthiophene) regioregular body manufactured by Aldrich
- purified by chelate method using ED TA and well-purified so that the content of Zn and Ni is less than 10 ppm.
- Solution 1 was prepared.
- an organic semiconductor composition that does not require an alignment treatment of an alignment film and the like, can be formed into a coating film by using a very simple method, and such an organic semiconductor composition is used. It was possible to obtain semiconductor devices such as organic thin film transistors and optical sensors.
Description
Claims
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JP2003586230A JP4736324B2 (ja) | 2002-04-22 | 2003-04-16 | 半導体素子及びその製造方法 |
EP03720909A EP1498456A4 (en) | 2002-04-22 | 2003-04-16 | ORGANIC SEMICONDUCTOR COMPOSITION, ORGANIC SEMICONDUCTOR ELEMENT AND MANUFACTURING METHOD THEREFOR |
AU2003235181A AU2003235181A1 (en) | 2002-04-22 | 2003-04-16 | Organic semiconductor composition, organic semiconductor element, and process for producing the same |
US10/511,353 US7081210B2 (en) | 2002-04-22 | 2003-04-16 | Organic semiconductor composition |
US11/433,318 US7582897B2 (en) | 2002-04-22 | 2006-05-12 | Organic semiconductor composition, organic semiconductor element, and their manufacturing method |
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Also Published As
Publication number | Publication date |
---|---|
JP4736324B2 (ja) | 2011-07-27 |
US7081210B2 (en) | 2006-07-25 |
JPWO2003089515A1 (ja) | 2005-09-02 |
US20060214252A1 (en) | 2006-09-28 |
EP1498456A1 (en) | 2005-01-19 |
US7582897B2 (en) | 2009-09-01 |
AU2003235181A1 (en) | 2003-11-03 |
EP1498456A4 (en) | 2009-06-10 |
US20050148179A1 (en) | 2005-07-07 |
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