WO2011096508A1 - 光電気素子 - Google Patents
光電気素子 Download PDFInfo
- Publication number
- WO2011096508A1 WO2011096508A1 PCT/JP2011/052339 JP2011052339W WO2011096508A1 WO 2011096508 A1 WO2011096508 A1 WO 2011096508A1 JP 2011052339 W JP2011052339 W JP 2011052339W WO 2011096508 A1 WO2011096508 A1 WO 2011096508A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electron transport
- transport layer
- electrode
- conductive
- organic compound
- Prior art date
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Images
Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K30/00—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation
- H10K30/10—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation comprising heterojunctions between organic semiconductors and inorganic semiconductors
- H10K30/15—Sensitised wide-bandgap semiconductor devices, e.g. dye-sensitised TiO2
- H10K30/151—Sensitised wide-bandgap semiconductor devices, e.g. dye-sensitised TiO2 the wide bandgap semiconductor comprising titanium oxide, e.g. TiO2
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2004—Light-sensitive devices characterised by the electrolyte, e.g. comprising an organic electrolyte
- H01G9/2018—Light-sensitive devices characterised by the electrolyte, e.g. comprising an organic electrolyte characterised by the ionic charge transport species, e.g. redox shuttles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2027—Light-sensitive devices comprising an oxide semiconductor electrode
- H01G9/2031—Light-sensitive devices comprising an oxide semiconductor electrode comprising titanium oxide, e.g. TiO2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2059—Light-sensitive devices comprising an organic dye as the active light absorbing material, e.g. adsorbed on an electrode or dissolved in solution
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/10—Transparent electrodes, e.g. using graphene
- H10K2102/101—Transparent electrodes, e.g. using graphene comprising transparent conductive oxides [TCO]
- H10K2102/102—Transparent electrodes, e.g. using graphene comprising transparent conductive oxides [TCO] comprising tin oxides, e.g. fluorine-doped SnO2
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/10—Transparent electrodes, e.g. using graphene
- H10K2102/101—Transparent electrodes, e.g. using graphene comprising transparent conductive oxides [TCO]
- H10K2102/103—Transparent electrodes, e.g. using graphene comprising transparent conductive oxides [TCO] comprising indium oxides, e.g. ITO
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/542—Dye sensitized solar cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
Definitions
- the present invention relates to a photoelectric element that converts light into electricity or electricity into light.
- photoelectric elements have been used for photoelectric conversion elements such as photovoltaic cells and solar cells, light emitting elements such as organic EL, optical display elements such as electrochromic display elements and electronic paper, and sensor elements that sense temperature and light. It is used.
- Such an electron transport layer has been conventionally formed from a metal, an organic semiconductor, an inorganic semiconductor, a conductive polymer, conductive carbon, or the like.
- an electron transport layer for transporting electrons is formed of an organic substance using electrons as carriers, such as fullerene, a perylene derivative, a polyphenylene vinylene derivative, or pentacene.
- electrons such as fullerene, a perylene derivative, a polyphenylene vinylene derivative, or pentacene.
- Non-patent Document 5 As a molecular element type solar cell, there has been a report of forming a thin film on a substrate of a structure formed by chemically bonding an electron donating molecule (donor) and an electron accepting molecule (acceptor) (Non-patent Document 5). reference).
- the present condition is that the electron transport layer for electron transport which has the more excellent electron transport characteristic and a sufficiently wide interface is desired.
- the effective diffusion distance is a distance until the electrode reaches the electrode after the charge separation, and the conversion efficiency of the device increases as the effective diffusion distance increases.
- conversion efficiency is sufficient because the interface area of charge separation is not sufficient, and the electron conduction potential affecting the open circuit voltage is uniquely determined by the constituent elements. is not.
- Patent Document 1 discloses dye-sensitized semiconductor particles 12 constituting a semiconductor layer 11 formed on an electrode 4 on a substrate 7 as shown in FIG. Describes a method of ensuring the conductivity of the semiconductor layer 11 by mixing spherical conductive particles 13 between them.
- the electrons excited by the incident light are trapped by the conductive particles 13 having a high conductivity when moving through the mixed film of the dye-sensitized semiconductor particles 12 and the conductive particles 13, and the electrons move. It is thought that it is hindered, and improvement in conversion efficiency cannot be expected.
- Patent Document 2 the metal surface is anodized, and the surface is covered with a porous metal oxide to form an integrated structure of the conductive substrate and the oxide film, thereby reducing the electric resistance at the reaction interface.
- a method of reducing is described.
- metal titanium must be used as a base material, and there is a concern that the cost will increase.
- the present invention has been made in view of the above points, and includes an electron transport layer having excellent electron transport characteristics and a sufficiently wide reaction interface, light having low resistance loss, and excellent light-to-electricity conversion efficiency.
- An object is to provide an electrical element.
- the photoelectric device includes a pair of electrodes, an electron transport layer and a hole transport layer sandwiched between the pair of electrodes, and an electrolyte solution, and the electron transport layer is subjected to repeated redox.
- An organic compound having a possible redox part the electrolyte solution has a function of stabilizing the reduced state of the redox part, the organic compound and the electrolyte solution form a gel layer, Is present in the gel layer, and at least a part of the conductive additive is in contact with the electrode.
- the conductivity aid preferably has a roughness factor of 5 or more and 2000 or less.
- the conductive auxiliary material is composed of a connected body of particulate conductive materials.
- the conductive auxiliary material is composed of a fibrous conductive material.
- an average outer diameter of the fibrous conductive material is 50 nm or more and 1000 nm or less.
- the porosity of the conductive additive made of the fibrous conductive material is 50% or more and 95% or less.
- an average fiber length / average fiber diameter ratio of the fibrous conductive material is 1000 or more.
- an optoelectric device having an electron transport layer having excellent electron transport characteristics and a sufficiently wide reaction interface, having a low resistance loss, and excellent in conversion efficiency between light and electricity.
- FIG. 6 is an electron micrograph of a porous conductive film in Example 5. It is a schematic sectional drawing which shows an example of embodiment of this invention. It is the schematic sectional drawing which expanded a part which shows a prior art example.
- the electron transport layer 1 and the hole transport layer 5 are sandwiched between the pair of electrodes 4 and 6 (the first electrode 4 and the second electrode 6).
- the electron transport layer 1 includes an organic compound having a redox portion capable of repeated redox. This organic compound swells including an electrolyte solution that stabilizes the reduced state of the redox portion, whereby the gel layer 2 is formed.
- the conductive additive 3 is present in the gel layer 2 and at least a part of the conductive additive 3 is in contact with the first electrode 4. Thereby, the organic compound and electrolyte solution of the electron carrying layer 1 comprise the gel layer 2, and therefore a reaction interface becomes large.
- the conductive auxiliary material 3 is present in the gel layer 2 and at least a part of the conductive auxiliary material 3 is in contact with the electrode 4, the electron transport characteristics in the electron transport layer 1 are improved. Thereby, the conversion efficiency of light and electricity in the photoelectric element is improved.
- the organic compound and the electrolyte solution in the electron transport layer 1 constitute the gel layer 2, thereby increasing the reaction interface, and the presence of the conductive additive 3 in the gel layer 2 allows the electrons in the electron transport layer 1.
- the transport characteristics are improved, and thus the conversion efficiency between light and electricity by the photoelectric element is improved.
- the roughness factor of the conductive additive 3 is preferably 5 or more and 2000 or less. In this case, the current collection effect of the gel layer 2 is increased, and side reactions on the surface of the conductive additive 3 are suppressed, thereby further improving the conversion efficiency.
- Roughness factor refers to the ratio of the actual surface area to the projected area. This projected area matches the projected area of the gel layer 2.
- the actual surface area for example, if the conductive additive 3 is composed of n spherical conductive materials having a diameter r, the actual surface area of the conductive additive 3 is n ⁇ 4 ⁇ ⁇ ⁇ r 2 . If the actual surface area of the conductive additive 3 cannot be obtained from the shape of the conductive additive 3, it may be obtained by a nitrogen adsorption method.
- the conductive auxiliary material 3 may be composed of a connected body formed by connecting particulate conductive materials.
- the electron transport property of the electron transport layer 1 is improved and the conversion efficiency is further improved only by mixing the particles of the conductive material in the gel formed of the organic compound of the electron transport layer 1 and the electrolyte solution. .
- the conductive aid 3 may be made of a fibrous conductive material.
- the conductive material is fibrous, the strength of the conductive additive 3 composed of this conductive material is increased, so that the conductive additive 3 having a high porosity is easily formed. For this reason, the electron transport layer 1 and the gel layer 2 are easily formed in the gap of the conductive additive 3.
- the average outer diameter of the fibrous conductive material is preferably 50 nm or more and 1000 nm or less.
- the average outer diameter of the conductive material is an average value of the outer diameters of the conductive material measured by an electron microscope such as an SEM (measured number is 30).
- the strength of the conductive additive 3 is further improved to form the conductive additive 3 having a high porosity, and the specific surface area of the conductive additive 3 is sufficiently increased to further improve the output of the photoelectric element. .
- 50% or more and 95% or less may be sufficient as the porosity of the conductive support material 3 comprised from the fibrous conductive material.
- a sufficient amount of the conductive additive 3 is present in the gel layer 2, which further improves the electron transport characteristics of the electron transport layer 1.
- the presence of a sufficient amount of the organic compound and the electrolyte solution in the voids of the conductive additive 3 ensures a sufficient photoelectric conversion region in the gel layer 2, thereby further improving the conversion efficiency.
- the average fiber length / average fiber diameter ratio of the fibrous conductive material is preferably 1000 or more. In this case, it becomes easy to laminate in the state where the fibrous conductive material is arranged in the surface direction of the electrode 4, and therefore the porosity of the conductive auxiliary material 3 made of the fibrous conductive material is increased. This further improves the conversion efficiency.
- An average fiber length and an average fiber diameter are the average values (30 measurement number) of the fiber length and fiber diameter of an electroconductive material measured from the observation result by electron microscopes, such as SEM. The nodule portion of the fibrous conductive material is excluded from the measurement point of the fiber diameter.
- a sensitizing dye may be present in the gel layer 2 and the sensitizing dye may be immobilized by a physical or chemical action with the organic compound constituting the gel layer 2. In this case, when the distance between the sensitizing dye and the organic compound approaches, the electron transport efficiency between the sensitizing dye and the organic compound is improved.
- FIG. 3 shows an example of a photoelectric element.
- a pair of base materials 7 and 8 (the first base material 7 and the second base material 8) are arranged to face each other.
- the first electrode 4 is disposed on the inner surface of the first base material 7, and the second electrode 6 is disposed on the inner surface of the second base material 8.
- the materials 8 are opposed to each other.
- the electron transport layer 1 is provided on the surface of the first electrode 4 opposite to the first substrate 7.
- a hole transport layer 5 is provided on the surface of the second electrode 6 opposite to the second substrate 8.
- the electron transport layer 1 is formed from an organic compound having a redox portion.
- the organic compound and the electrolyte solution in the electron transport layer 1 form the gel layer 2. In this gel layer 2, a conductive aid 3 exists.
- the first electrode 4 is formed by laminating a conductive material on an insulating first base material 7 formed of, for example, glass or a light-transmitting film.
- the first electrode 4 may be formed from a single metal film.
- Preferred examples of the conductive material include metals such as platinum, gold, silver, copper, aluminum, rhodium, and indium; carbon; indium-tin composite oxide, tin oxide doped with antimony, and tin oxide doped with fluorine. Examples thereof include conductive metal oxides; composites of the metals and compounds; materials obtained by coating the metals and compounds with silicon oxide, tin oxide, titanium oxide, zirconium oxide, aluminum oxide, and the like.
- the surface resistance of the electrode 4 is preferably as low as possible, but the surface resistance is preferably 200 ⁇ / ⁇ or less, more preferably 50 ⁇ / ⁇ or less.
- the lower limit of the surface resistance is not particularly limited, but is usually 0.1 ⁇ / ⁇ .
- the first electrode 4 is formed on the first base material 7, it is necessary for light to pass through the base material 7 as in the case where the photoelectric element is a power generation element, a light emitting element, an optical sensor, or the like. If it exists, it is desirable that the light transmittance of the base material 7 is high.
- the preferable light transmittance of the base material 7 in this case is 50% or more at a wavelength of 500 nm, and more preferably 80% or more.
- the thickness of the first electrode 4 is preferably in the range of 0.1 to 10 ⁇ m. If it is in this range, the 1st electrode 4 will be easily formed in uniform thickness, and also the fall of the light transmittance of the 1st electrode 4 will be controlled. Accordingly, sufficient light can be incident on or emitted from the photoelectric element via the first electrode 4.
- the first electrode 4 may be formed by a vacuum process such as a sputtering method or a vapor deposition method, or a transparent material composed of indium oxide, tin oxide, zinc oxide or the like by a wet method such as a spin coating method, a spray method, or screen printing.
- the first electrode 4 may be formed by forming a conductive oxide layer.
- the second electrode 6 functions as a positive electrode of the photoelectric element.
- the second electrode 6 is formed, for example, by laminating a conductive material on the second substrate 8.
- the second electrode 6 may be formed from a single metal film.
- the material for forming the second electrode 6 depends on the type of the photoelectric element including the second electrode 6, for example, metals such as platinum, gold, silver, copper, aluminum, rhodium, indium, graphite, Carbon nanotubes, carbon materials such as carbon carrying platinum, indium-tin composite oxide, tin oxide doped with antimony, conductive metal oxides such as tin oxide doped with fluorine, polyethylene dioxythiophene, polypyrrole, polyaniline And the like, and the like.
- As a method for forming the second electrode 6 on the second substrate 8 the same method as that for forming the second electrode 4 on the first substrate 7 can be used.
- the second substrate 8 can be formed from the same material as the first substrate 7. When the second electrode 6 is formed on the second base material 8, the second base material 8 may or may not have translucency.
- the second substrate 8 is preferably transparent in that light can enter or exit from both the hole transport layer 5 side and the electron transport layer 1 side of the photoelectric element.
- the electron transport layer 1 is composed of an organic compound.
- the molecule of the organic compound has a redox portion that can be repeatedly redox, and also has a portion (hereinafter referred to as a gel portion) that becomes a gel by swelling with the electrolyte solution.
- the redox moiety is chemically bonded to the gel site.
- the positional relationship between the redox moiety and the gel part in the molecule is not particularly limited.
- the gel part constitutes a skeleton such as the main chain of the molecule
- the redox part is bonded to the main chain as a side chain. Yes.
- the molecular skeleton that forms the gel part and the molecular skeleton that forms the redox moiety may be alternately bonded.
- the gel layer 2 can hold the oxidation-reduction part so that the oxidation-reduction part stays at a position where it is easy to transport electrons.
- the organic compound having a redox moiety and a gel part may be a low molecular weight substance or a high molecular weight substance.
- an organic compound that forms a so-called low molecular gel through hydrogen bonding or the like can be used.
- the organic compound is a polymer, an organic compound having a number average molecular weight of 1000 or more is preferable because it can spontaneously express a gelling function.
- the upper limit of the molecular weight is not particularly limited, but is preferably 1,000,000 or less.
- the gel state of the gel layer 2 is preferably, for example, konjac or an external shape such as an ion exchange membrane, but is not limited to these states.
- An oxidation-reduction part means a site that is reversibly converted into an oxidant and a reductant in a redox reaction.
- the redox moiety is not particularly limited as long as it is a site constituting a pair of redox systems composed of an oxidant and a reductant, but the oxidant and the reductant preferably have the same charge.
- Swelling degree is a physical index that affects the size of the reaction interface related to the gel layer 2.
- the swelling degree said here is represented by the following formula.
- the gel dried body refers to a dried gel layer 2. Drying the gel layer 2 means removing the solution contained in the gel layer 2, especially removing the solvent. Examples of the method for drying the gel layer 2 include a method by heating, a method for removing the solution or solvent in a vacuum environment, a method for removing the solution or solvent contained in the gel layer 2 using another solvent, and the like. It is done.
- the degree of swelling of the gel layer 2 is preferably 110 to 3000%, more preferably 150 to 500%.
- the degree of swelling is less than 110%, the electrolyte component in the gel layer 2 is reduced, so that the redox part may not be sufficiently stabilized.
- the degree of swelling exceeds 3000%, the redox part in the gel layer 2 is reduced, and the electron transport ability may be reduced. In either case, the characteristics of the photoelectric element are deteriorated.
- An organic compound having a redox moiety and a gel site as described above in one molecule can be represented by the following general formula.
- (X i ) nj : Y k (X i ) n represents a gel site, and X i represents a monomer of a compound constituting the gel site.
- the gel site can be formed from a polymer backbone.
- Y represents a redox moiety bonded to (X i ) n .
- j and k are each an arbitrary integer representing the number of (X i ) n and Y contained in one molecule, and both are preferably in the range of 1 to 100,000.
- the redox moiety Y may be bonded to any part of the polymer skeleton that forms the gel part (X i ) n .
- the oxidation-reduction part Y may contain different types of sites, and in this case, a site with a near redox potential is preferable from the viewpoint of the electron exchange reaction.
- Examples of the organic compound having such a redox moiety Y and a gel site (X i ) n in one molecule include a polymer having a quinone derivative skeleton formed by chemically bonding quinones, and an imide derivative skeleton containing an imide.
- the polymer skeleton is a gel site, and the quinone derivative skeleton, the imide derivative skeleton, the phenoxyl derivative skeleton, and the viologen derivative skeleton are redox portions.
- examples of polymers having a quinone derivative skeleton formed by chemically bonding quinones include those having the following chemical structures [Chemical Formula 1] to [Chemical Formula 4].
- R represents methylene, ethylene, propane-1,3-dienyl, ethylidene, propane-2,2-diyl, alkanediyl, benzylidene, propylene, vinylidene, propene-1,3- Saturated or unsaturated hydrocarbons such as diyl, but-1-ene-1,4-diyl; cyclic hydrocarbons such as cyclohexanediyl, cyclohexenediyl, cyclohexadienediyl, phenylene, naphthalene, biphenylene; oxalyl, malonyl, succinyl, Glutanyl, adipoyl, al
- [Chemical Formula 1] is an example of an organic compound formed by chemically bonding anthraquinone to the polymer main chain.
- [Chemical Formula 2] is an example of an organic compound constituted by incorporating anthraquinone as a repeating unit into a polymer main chain.
- [Chemical Formula 3] is an example of an organic compound in which anthraquinone is a cross-linking unit.
- [Chemical Formula 4] shows an example of anthraquinone having a proton donating group that forms an intramolecular hydrogen bond with an oxygen atom.
- the above quinone polymer is capable of high-speed redox reaction that is not limited by proton transfer, and there is no electronic interaction between quinone groups, which are redox sites (redox sites), and chemical stability that can withstand long-term use. Have sex. Moreover, since this quinone polymer does not elute in the electrolyte solution, it is useful in that the electron transport layer 1 can be formed by being held by the first electrode 4.
- Examples of the polymer having an imide derivative skeleton containing imide include polyimides represented by [Chemical Formula 5] and [Chemical Formula 6].
- R 1 to R 3 are an aromatic group such as a phenylene group, an aliphatic group such as an alkylene group or an alkyl ether, or an ether group.
- the polyimide polymer skeleton may be cross-linked at the R 1 to R 3 portions, but may not have a cross-linked structure as long as the polyimide polymer skeleton swells in the solvent and does not elute. In the case of crosslinking, the portion where the crosslinking occurs corresponds to the gel site (X i ) n .
- an imide group may be contained in the crosslinking unit.
- the imide group phthalimide, pyromellitic imide, or the like is preferably used as long as it shows electrochemically reversible redox characteristics.
- Examples of the polymer having a phenoxyl derivative skeleton containing phenoxyl include a galbi compound (galbi polymer) represented by [Chemical Formula 7].
- the galbi compound represented by [Chemical Formula 7]
- the galvinoxyl group corresponds to the redox site Y
- the polymer skeleton corresponds to the gel site (X i ) n .
- Examples of the polymer having a viologen derivative skeleton containing viologen include polyviologen polymers as shown in [Chemical 9] and [Chemical 10].
- the site represented by [Chemical Formula 11] corresponds to the redox moiety Y
- the polymer skeleton corresponds to the gel site (X i ) n .
- m and n represent the degree of polymerization of the monomer, and the values are 1 to A range of 100,000 is preferred.
- the gel layer 2 is formed by the electrolyte solution being contained and swollen between the polymer skeleton of the organic compound having the above-described oxidation-reduction portion and the gel portion composed of the polymer skeleton.
- the electrolyte solution is contained in the electron transport layer 1 formed from the organic compound, so that the ionic state formed by the redox reaction of the redox part is compensated by the counter ion in the electrolytic solution, and the redox part is Stabilized.
- the electrolyte solution only needs to contain an electrolyte and a solvent.
- the electrolyte is either one or both of a supporting salt and a pair of redox constituents composed of an oxidant and a reductant.
- the supporting salt supporting electrolyte
- examples of the supporting salt include tetrabutylammonium perchlorate, tetraethylammonium hexafluorophosphate, ammonium salts such as imidazolium salt and pyridinium salt, alkali metals such as lithium perchlorate and potassium tetrafluoroborate. Examples include salt.
- the redox-based constituent material means a pair of substances that are present reversibly in the form of an oxidized form and a reduced form in a redox reaction.
- redox-based constituent materials include chlorine compound-chlorine, iodine compound-iodine, bromine compound-bromine, thallium ion (III) -thallium ion (I), mercury ion (II) -mercury ion (I ), Ruthenium ion (III) -ruthenium ion (II), copper ion (II) -copper ion (I), iron ion (III) -iron ion (II), nickel ion (II) -nickel ion (III), Examples thereof include, but are not limited to, vanadium ion (III) -vanadium ion (II), manganate ion-permanganate ion, and the like. These redox constituents function differently from the
- the solvent constituting the electrolyte solution includes at least one of water, an organic solvent, and an ionic liquid.
- organic solvent examples include carbonate compounds such as dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, ethylene carbonate, and propylene carbonate, ester compounds such as methyl acetate, methyl propionate, and ⁇ -butyrolactone, diethyl ether, 1, Ether compounds such as 2-dimethoxyethane, 1,3-dioxosilane, tetrahydrofuran, 2-methyl-tetrahydrofuran, heterocyclic compounds such as 3-methyl-2-oxazodilinone, 2-methylpyrrolidone, acetonitrile, methoxyacetonitrile, propionitrile, etc.
- carbonate compounds such as dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, ethylene carbonate, and propylene carbonate
- ester compounds such as methyl acetate, methyl propionate, and ⁇ -butyrolactone
- diethyl ether 1, Ether compounds such
- aprotic polar compounds such as nitrile compounds, sulfolane, dimethyl sulfoxide and dimethylformamide. These can be used alone or in combination of two or more.
- carbonate compounds such as ethylene carbonate and propylene carbonate, ⁇ -butyrolactone, 3-methyl-2-oxazozirinone, 2-methyl Heterocyclic compounds such as pyrrolidone, and nitrile compounds such as acetonitrile, methoxyacetonitrile, propionitrile, 3-methoxypropionitrile, and valeric nitrile are preferred.
- the redox part is stabilized, and the ionic liquid is not volatile and has high flame retardancy, so that it has excellent stability.
- known ionic liquids in general can be used.
- imidazolium-based such as 1-ethyl-3-methylimidazolium tetracyanoborate
- pyridine-based alicyclic amine-based, aliphatic amine-based
- Azonium amine-based ionic liquids European Patent No. 718288, International Publication WO95 / 18456, Pamphlet 65, 11 (923), J. Electrochem. Soc. 143, 10 No., 3099 (1996), Inorg. Chem. Vol. 35, 1168 (1996).
- the electron transport layer 1 is formed by providing the gel layer 2 formed of the organic compound having an oxidation-reduction portion and the electrolyte solution as described above on the surface of the electrode 4. In the electron transport layer 1 formed in this way, electrons behave as dopants.
- the electron transport layer 1 is oxidized such that the redox potential is nobler than +100 mV with respect to the silver / silver chloride reference electrode 4. It has a reducing part.
- the thickness of the electron transport layer 1 is preferably in the range of 10 nm to 10 mm from the viewpoint of maintaining good electron transport properties. Particularly preferably, the thickness is 100 nm to 100 ⁇ m. With this thickness, good electron transport characteristics of the electron transport layer 1 and an increase in the area of the interface can be achieved at a higher level.
- a wet forming method in which the electron transport layer 1 is formed by applying a solution or the like is preferable because it is a simpler and lower cost manufacturing method.
- a wet forming method is preferable from the viewpoint of moldability.
- the wet process include a spin coating method, a drop cast method in which droplets are dropped and then dried, and a printing method such as screen printing and gravure printing.
- vacuum processes such as sputtering and vapor deposition can also be employed.
- a sensitizing dye for efficiently absorbing visible light or near-infrared light may be provided at the interface between the electron transport layer 1 and the hole transport layer 5 in contact with the electron transport layer 1.
- the gel layer 2 is formed by swelling an organic compound having a redox moiety in the electron transport layer 1 with an electrolyte solution, and the hole transport layer 5 is formed with a similar electrolyte solution.
- the electrolyte solution contained therein also forms part of the hole transport layer 5. Therefore, the sensitizing dye is present in the gel layer 2 by adhering, adsorbing, or bonding to the surface of the organic compound that forms the electron transport layer 1, so that the sensitizing dye is transported by electrons. It is provided at the interface between the layer 1 and the hole transport layer 5. When the sensitizing dye is thus provided, a dye-sensitized photoelectric conversion element is produced.
- sensitizing dye known materials can be used.
- 9-phenylxanthene dye, coumarin dye, acridine dye, triphenylmethane dye, tetraphenylmethane dye, quinone dye, azo dye examples thereof include dyes, indigo dyes, cyanine dyes, merocyanine dyes, and xanthene dyes.
- RuL 2 (H 2 O) 2 type ruthenium-cis-diaqua-bipyridyl complex (where L represents 4,4′-dicarboxyl-2,2′-bipyridine), ruthenium -Transition metal complexes of types such as tris (RuL 3 ), ruthenium-bis (RuL 2 ), osnium-tris (OsL 3 ), osnium-bis (OsL 2 ), zinc-tetra (4-carboxyphenyl) porphyrin, iron -Hexacyanide complexes, phthalocyanines and the like.
- the sensitizing dye for example, a dye as described in the DSSC chapter of “FPD / DSSC / Optical memory and the latest technology and material development of functional dye” (NTS Inc.) may be applied.
- dyes having associative properties are preferable from the viewpoint of promoting charge separation during photoelectric conversion.
- a dye having an effect by forming an aggregate for example, a dye represented by the structure of [Chemical Formula 12] is preferable.
- X 1 and X 2 are an organic group having at least one alkyl group, alkenyl group, aralkyl group, aryl group, or heterocyclic ring, and each may have a substituent. It is known that a dye such as the above [Chemical Formula 12] is associative. In this case, the recombination of electrons and holes existing in the electron transport layer 1 and the hole transport layer 5 is dramatically reduced, and the conversion efficiency of the photoelectric conversion element obtained thereby is improved.
- the sensitizing dye contained in the electron transport layer 1 is present in the gel layer 2.
- the sensitizing dye is preferably immobilized in the gel layer 2 by a physical or chemical action with the organic compound constituting the gel layer 2.
- the sensitizing dye is preferably present throughout the entire gel layer 2.
- the sensitizing dye is present in the gel layer 2 means that the sensitizing dye is present not only in the surface layer of the gel layer 2 but also in the inside thereof. As a result, the amount of the sensitizing dye present in the gel layer 2 is continuously maintained in a state of a certain value or more, thereby bringing about an effect of improving the output of the photoelectric element.
- the state in which the sensitizing dye is present in the gel layer 2 includes “the state in which the sensitizing dye is present in the electrolyte solution constituting the gel layer 2” and “the sensitizing dye is in the gel layer 2”. In a state of being held in the gel layer 2 by physically or chemically interacting with an organic compound constituting “.
- the state in which the sensitizing dye is held in the gel layer 2 by physically interacting with the organic compound constituting the gel layer 2 means, for example, sensitization as an organic compound constituting the gel layer 2
- an organic compound having a structure that prevents the movement of molecules in the dye gel layer 2 By using an organic compound having a structure that prevents the movement of molecules in the dye gel layer 2, the movement of the molecules of the sensitizing dye is prevented in the gel layer 2.
- Structures that prevent the movement of sensitizing dye molecules include structures in which various molecular chains such as alkyl chains of organic compounds exhibit steric hindrance, and the size of voids that exist between the molecular chains of organic compounds. For example, a structure that is small enough to suppress the above.
- the sensitizing dye It is also effective to bring a factor that develops a physical interaction to the sensitizing dye side. Specifically, it is also effective to give the sensitizing dye a structure that expresses steric hindrance due to various molecular chains such as an alkyl chain, and to link two or more sensitizing dye molecules.
- a sulfur-containing group such as sulfanyl and sulfonyl, a nitrogen-containing group such as imino, nitrilo, hydrazo, azo, azino, diazoamino, urylene, amide, a silicon-containing group such as silanediyl, disilane-1,2-diyl, or a terminal thereof It is effective to utilize a substituted group or a complex group.
- Said moiety may be a substituted, linear or branched alkyl group such as methyl, ethyl, i-propyl, butyl, t-butyl, octyl, 2-ethylhexyl, 2-methoxyethyl, benzyl, Trifluoromethyl, cyanomethyl, ethoxycarbonylmethyl, propoxyethyl, 3- (1-octylpyridinium-4-yl) propyl, 3- (1-butyl-3-methylpyridinium-4-yl) propyl, etc.
- it is desirable to bind to the sensitizing dye via an alkenyl group which may be linear or branched, for example, vinyl or allyl.
- the state in which the sensitizing dye is held in the gel layer 2 by chemically interacting with the organic compound constituting the gel layer 2 means, for example, sharing between the sensitizing dye and the organic compound In the gel layer 2 due to chemical interaction such as bond, coordination bond, ionic bond, hydrogen bond, van der Waals bond, hydrophobic interaction, hydrophilic interaction, force based on electrostatic interaction, etc.
- the sensitizing dye is retained.
- the sensitizing dye is fixed in the gel layer 2 by the chemical interaction between the sensitizing dye and the organic compound constituting the gel layer 2, the distance between the sensitizing dye and the organic compound approaches. For this reason, electrons move more efficiently.
- the sensitizing dye is fixed in the gel layer 2 by chemical interaction between the organic compound and the sensitizing dye
- functional groups are appropriately introduced into the organic compound and the sensitizing dye
- the sensitizing dye is fixed to the organic compound by a chemical reaction or the like.
- functional groups include hydroxyl groups, carboxyl groups, phosphate groups, sulfo groups, nitro groups, alkyl groups, carbonate groups, aldehyde groups, thiol groups, and the like.
- the reaction format of the chemical reaction via the functional group include a condensation reaction, an addition reaction, and a ring-opening reaction.
- a functional group in the sensitizing dye is introduced in the vicinity of a site where the electron density is increased in a state where the sensitizing dye is photoexcited, and the gel It is preferable that the functional group in the organic compound in the layer 2 is introduced in the vicinity of a site involved in electron transport in the organic compound. In this case, the efficiency of electron transfer from the sensitizing dye to the organic compound and the efficiency of electron transport in the organic compound can be improved.
- the sensitizing dye and the organic compound constituting the gel layer 2 are bonded with a bonding group having a high electron transporting property that connects the electron cloud of the sensitizing dye and the electron cloud of the organic compound, it is more efficient. Electrons can move from the sensitizing dye to the organic compound. Specifically, an example in which an ester bond having a ⁇ electron system or the like is used as a chemical bond that links a ⁇ electron cloud of a sensitizing dye and a ⁇ electron cloud of an organic compound.
- the timing when the sensitizing dye and the organic compound are combined is when the organic compound is in a monomer state, when the organic compound is polymerized, when the organic compound is gelated after the organic compound is polymerized, and the organic compound is gelled. Any of these may be used.
- Specific examples of the method include a method in which the electron transport layer 1 formed of an organic compound is immersed in a bath containing a sensitizing dye, and a coating solution containing the organic compound and the sensitizing dye is applied to the electrode 4.
- a method of forming the electron transport layer 1 by forming a film may be used, and a plurality of methods may be combined.
- the sensitizing dye When the sensitizing dye is immobilized by a physical or chemical action between the organic compound constituting the gel layer 2 as described above, the distance between the sensitizing dye and the organic compound is increased. Electron transport efficiency between the dye-sensitive material and the organic compound is improved.
- the content of the sensitizing dye in the gel layer 2 is set as appropriate.
- the content of the sensitizing dye is 0.1 parts by mass or more with respect to 100 parts by mass of the organic compound, the unit film of the gel layer 2
- the amount of the sensitizing dye per thickness becomes sufficiently high, thereby improving the light absorption capability of the sensitizing dye and obtaining a high current value.
- the content of the sensitizing dye is 1000 parts by mass or less with respect to 100 parts by mass of the organic compound, it is suppressed that an excessive amount of the sensitizing dye is interposed between the organic compounds, and electron transfer in the organic compound is prevented. Inhibition by the sensitizing dye is suppressed, and high conductivity is ensured.
- This embodiment is characterized in that a conductive additive 3 is present in the gel layer 2 as described above.
- the conductive additive 3 is used to improve the electron transport characteristics between the electron transport layer 1 and the first electrode 4.
- a plurality of conductive aids 3 are mixed in the electron transport layer 1 and are in contact with each other, and a part of the conductive aids 3 is in contact with the electrodes 4. .
- movement of electrons from the electron transport layer 1 to the first electrode 4 or from the first electrode 4 to the electron transport layer 1 is performed via the conductive additive 3, so that the movement of the electrons is extremely quick.
- the electron transport property between the electron transport layer 1 and the electrode 4 is further improved.
- the photoelectric element is a photoelectric conversion element such as a dye-sensitized photoelectric conversion element
- the conductive additive 3 efficiently collects electrons from the electron transport layer 1 and quickly transports them to the first electrode 4. Can do.
- the conductive additive 3 present in the gel layer 2 of the electron transport layer 1 is preferably composed of a material having both translucency and conductivity.
- a conductive material is preferably present in the electron transport layer 1.
- ITO indium-tin oxide
- tin oxide zinc oxide
- silver gold, copper, carbon nanotube, graphite and the like
- the conductive material include Pastran manufactured by Mitsui Mining & Smelting Co., Ltd., in which barium sulfate or aluminum borate is used as a core material, and the core material is coated with tin oxide, dopant-treated tin oxide, ITO, or the like.
- metal fine particles can also be used as long as the electron transport layer 1 does not lose its translucency.
- the volume resistivity of the conductive additive 3 is preferably 10 7 ⁇ / cm or less, more preferably 10 5 ⁇ / cm or less, and particularly preferably 10 ⁇ / cm or less.
- the lower limit of the volume resistivity is not particularly limited, but is usually about 10 ⁇ 9 ⁇ / cm.
- the resistivity of the conductive additive 3 is not particularly limited, but is preferably equivalent to that of the first electrode 4.
- the conductive auxiliary material 3 may be formed from a connected body formed by connecting a plurality of particulate conductive materials in contact with each other. As shown, it may be formed from a rod-like conductive material.
- the average particle size of the conductive material is preferably 1 nm or more and 1 ⁇ m or less.
- the average particle diameter is an average value (measured number of 30) of the particle diameter of the conductive material measured from the observation result with an electron microscope such as SEM.
- the conductive material is less likely to be isolated in the electron transport layer 1 when the average particle diameter is 1 nm or more, and the contact between the conductive material and the electron transport layer 1 is when the average particle diameter is 1 ⁇ m or less. A sufficient area is secured. Therefore, the conductive additive 3 can exhibit a sufficient current collecting effect.
- the conductive auxiliary material 3 is preferably in the form of a rod from the viewpoint of increasing the contact area with the electron transport layer 1 and securing a contact point between the conductive materials.
- the bar shape indicates not only a linear shape but also a shape including, for example, a fiber shape, a needle shape, or a curved elongated shape.
- the average axial ratio between the major axis and the minor axis is preferably 5 or more and 50 or less. If the average axial ratio is 5 or more, the conductive materials mixed in the electron transport layer 1 and the conductive material and the first electrode 4 come into contact with each other, and the electrical continuity becomes extremely good.
- the resistance at the interface between the electron transport layer 1 and the first electrode 4 decreases. Furthermore, when the average axial ratio is 50 or less, the conductive auxiliary material 3 is prevented from being mechanically destroyed when the conductive auxiliary material 3 and the organic compound or the like are uniformly mixed to produce a paste. Is done.
- the average outer diameter of the short axis of the conductive material is preferably 1 nm or more and 20 ⁇ m or less.
- the conductive material is not easily destroyed mechanically when the conductive material and the organic compound are uniformly mixed to produce a paste.
- the resistance in the interface of the electron carrying layer 1 and the 1st electrode 4 can reduce.
- the average outer diameter of the short axis of the conductive material is 20 ⁇ m or less, a decrease in organic compounds per unit volume in the electron transport layer 1 due to the addition of the conductive material is suppressed.
- the conductive auxiliary material 3 is composed of a fibrous conductive material.
- the fibrous conductive material is laminated in a state of being arranged in the surface direction of the first electrode 4, the film of the first electrode 4 as well as the surface direction of the first electrode 4 which is the fiber direction is used. Also in the thickness direction, a high current collecting effect by the conductive additive 3 can be realized by forming a structure in which fibers arranged in the surface direction of the first electrode 4 are laminated.
- the strength of the conductive auxiliary material 3 composed of this conductive material is increased, so that the porosity of the conductive auxiliary material 3 can be easily increased. Therefore, it becomes easy to form the electron transport layer 1 and the gel layer 2 in the gap of the conductive additive 3.
- the average outer diameter of the minor axis of the fibrous conductive material is preferably 50 nm or more and 1000 nm or less.
- the strength of the conductive additive 3 is further improved, and the conductive additive 3 having a high porosity can be formed.
- the conductive additive 3 is provided on the first electrode 4, only a high-strength porous conductive film made of a fibrous conductive material is first formed on the first electrode 4.
- a porous conductive film is used as the conductive additive 3, and then the electron transport layer 1 and the gel layer 3 can be easily formed in the voids of the conductive additive 3.
- the average outer diameter is 1000 nm or less, the porosity of the conductive auxiliary material 3 made of a fibrous conductive material is increased and the specific surface area is sufficiently increased, whereby the output of the photoelectric element is increased. Can be improved.
- the porosity of the conductive additive 3 made of a fibrous conductive material is 50% or more and 95% or less.
- the porosity of the conductive auxiliary material 3 composed of a fibrous conductive material means the void of a layer (porous conductive film) made only of the conductive auxiliary material 3 excluding the organic compound, the electrolyte solution, etc. from the gel layer 2. Rate.
- the porosity is 50% or more, a sufficient amount of an organic compound or an electrolyte solution constituting the electron transport layer 1 or the gel layer 2 can be present inside the porous conductive film, and a photoelectric layer is contained in the gel layer 2. A sufficiently convertible area can be secured.
- the porosity is 95% or less, the distance from the first electrode 4 to the fibrous conductive material is suppressed from becoming too long, and the resistance loss reduction effect is suppressed from decreasing.
- an average fiber length / average fiber diameter ratio (average axial ratio) of the fibrous conductive material is 1000 or more. In this case, it becomes easy to laminate the fibrous conductive material in a state of being arranged in the surface direction of the first electrode 4.
- FIG. 1C schematically shows a state in which the conductive auxiliary material 3 is formed by laminating the fibrous conductive materials 9 arranged in the plane direction, and FIG. 2 shows the fibrous conductive material.
- 9 shows an electron micrograph in a plan view of the conductive additive 3 composed of 9; For this reason, the porosity of the conductive additive 3 made of a fibrous conductive material is increased, and higher light-electricity conversion efficiency can be realized.
- the roughness factor of the conductive additive 3 in the gel layer 2 is preferably 5 or more and 2000 or less. When this roughness factor is less than 5, the movement distance of electrons in the gel layer 2 becomes long, and the current collecting effect may not be sufficiently obtained. When the roughness factor of the conductive additive 3 is greater than 2000, side reactions are likely to occur on the surface of the conductive additive 3, which may cause a reduction in conversion efficiency.
- the first electrode 4 is a transparent electrode film formed of ITO or the like, the first electrode 4 is a non-porous dense film, and its roughness factor is usually a value of 1.5 or less. It becomes.
- an organic compound for forming the electron transport layer 1 and the conductive aid 3 are mixed to prepare a mixture such as a paste.
- a coating film is formed by the same method as the formation of the electron transport layer 1 on the surface of the first electrode 4 described above.
- a conductive material may be further mixed in the solution containing the organic compound.
- known mixing means for example, a wheel-type kneader, a ball-type kneader, a blade-type kneader, a roll-type kneader
- Mortar, crusher, colloid mill, omni mixer, swing mix, electromagnetic mixer, etc. may be employed.
- the mixed paste or slurry of an organic compound and a conductive material can be obtained.
- Examples of the material for forming the hole transport layer 5 include an electrolyte solution in which an electrolyte such as a redox couple is dissolved in a solvent, a solid electrolyte such as a molten salt, a p-type semiconductor such as copper iodide, and triphenylamine. And conductive polymers such as amine derivatives such as polyacetylene, polyaniline, and polythiophene.
- the hole transport layer 5 When the hole transport layer 5 is formed of an electrolyte solution, the hole transport layer 5 can also be formed of an electrolyte solution that constitutes the gel layer 2. In this case, the electrolyte solution constituting the gel layer 2 constitutes a part of the hole transport layer 5.
- the electrolyte solution may be held in a polymer matrix.
- a polyvinylidene fluoride polymer compound used as the polymer matrix a homopolymer of vinylidene fluoride or a copolymer of vinylidene fluoride and another polymerizable monomer (preferably a radical polymerizable monomer) may be used.
- polymerizable monomers copolymerized with vinylidene fluoride hereinafter referred to as copolymerizable monomers
- copolymerizable monomers include hexafluoropropylene, tetrafluoroethylene, trifluoroethylene, ethylene, propylene, acrylonitrile, vinylidene chloride.
- the hole transport layer 5 can contain a stable radical compound.
- the photoelectric element when configured as a photoelectric conversion element, holes generated by charge separation at the reaction interface are efficiently transferred from the hole transport layer 5 by the very fast electron transfer reaction of the stable radical compound. It is transported to the second electrode 6. Thereby, the photoelectric conversion efficiency of the photoelectric element can be improved.
- the stable radical compound is not particularly limited as long as it is a chemical species having an unpaired electron, that is, a compound having a radical. Among them, a radical compound having nitroxide (NO.) In the molecule is preferable. .
- the molecular weight (number average molecular weight) of the stable radical compound is preferably 1000 or more. If the molecular weight is 1000 or more, the stable radical compound becomes a solid at normal temperature or becomes difficult to volatilize when approaching the solid, which is preferable from the viewpoint of device stability.
- a stable radical compound is a compound that generates a radical compound in at least one of an electrochemical oxidation reaction and an electrochemical reduction reaction.
- the kind of radical compound is not specifically limited, It is preferable that it is a stable radical compound.
- an organic compound containing any one or both of the following [Chemical 13] and [Chemical 14] is preferable.
- the substituent R 1 is a substituted or unsubstituted C2-C30 alkylene group, a C2-C30 alkenylene group or a C4-C30 arylene group
- X is an oxy radical group, nitroxyl group
- n 1 is an integer of 2 or more.
- the substituents R 2 and R 3 are independent of each other and are a substituted or unsubstituted C2-C30 alkylene group, a C2-C30 alkenylene group, or a C4-C30 arylene group, and Y is , A nitroxyl radical group, a sulfur radical group, a hydrazyl radical group or a carbon radical group, and n 2 is an integer of 2 or more.
- Examples of the stable radical compound containing at least one of the structural units represented by [Chemical Formula 13] and [Chemical Formula 14] include, for example, an oxy radical compound, a nitroxyl radical compound, a carbon radical compound, a nitrogen radical compound, a boron radical compound, and sulfur. A radical compound etc. are mentioned.
- the number average molecular weight of the organic compound that generates this radical compound is preferably 10 3 to 10 7 , more preferably 10 3 to 10 5 .
- oxy radical compound examples include, for example, aryloxy radical compounds represented by the following [Chemical Formula 15] and [Chemical Formula 16], and semiquinone radical compounds represented by [Chemical Formula 17].
- the substituents R 4 to R 7 are independent of each other, and are a hydrogen atom, a substituted or unsubstituted aliphatic or aromatic C1-C30 hydrocarbon group, a halogen group. , Hydroxyl group, nitro group, nitroso group, cyano group, alkoxy group, aryloxy group or acyl group.
- n 3 is an integer of 2 or more.
- the number average molecular weight of the organic compound that generates any one of the radical compounds of [Chemical Formula 15] to [Chemical Formula 17] is preferably 10 3 to 10 7 .
- nitroxyl radical compound examples include a radical compound having a piperidinoxy ring such as the following [Chemical Formula 18], a radical compound having a pyrrolidinoxy ring such as [Chemical Formula 19], and a pyrrolinoquine ring such as [Chemical Formula 20]. And a radical compound having a nitronyl nitroxide structure such as [Chemical Formula 21].
- R 8 to R 10 and R A to R L are each independently a hydrogen atom, a substituted or unsubstituted aliphatic or aromatic C1-C30 hydrocarbon. Group, halogen group, hydroxyl group, nitro group, nitroso group, cyano group, alkoxy group, aryloxy group or acyl group.
- n 4 is an integer of 2 or more.
- the number average molecular weight of the organic compound that generates the radical compound of any one of the chemical formulas of [Chemical Formula 18] to [Chemical Formula 21] is preferably 10 3 to 10 7 .
- the nitrogen radical compound examples include a radical compound having a trivalent hydrazyl group such as the following [Chemical Formula 22], a radical compound having a trivalent ferdazyl group such as [Chemical Formula 23], and [Chemical Formula 24]. ]
- R 11 to R 19 each independently represent a hydrogen atom, a substituted or unsubstituted aliphatic or aromatic C1-C30 hydrocarbon group, halogen group, hydroxyl group. Group, nitro group, nitroso group, cyano group, alkoxy group, aryloxy group or acyl group.
- the number average molecular weight of the organic compound that generates the radical compound of any of the chemical formulas of [Chemical Formula 22] to [Chemical Formula 24] is preferably 10 3 to 10 7 .
- the number average molecular weight of the radical compound of any one of the above [Chemical Formula 13] to [Chemical Formula 24] is particularly preferably in the range of 10 3 to 10 7 .
- An organic polymer compound having a number average molecular weight in this range is excellent in stability, and as a result, the photoelectric element can be used stably as a photoelectric conversion element or energy storage element, and has excellent stability and response speed. An excellent photoelectric device can be easily obtained.
- the stable radical compound it is more preferable to select and use an organic compound that is in a solid state at room temperature among the above-described organic compounds. In this case, the contact between the radical compound and the electron transport layer 1 can be maintained stably, and the side reaction with other chemical substances, and the transformation and deterioration due to melting and diffusion can be suppressed. As a result, an optoelectric device having excellent stability can be obtained.
- the electron transport layer 1 is formed by laminating an organic compound on the first electrode 4 provided on the first substrate 7 by a wet method or the like.
- a hole transport layer 5 and a second electrode 6 are laminated on the electron transport layer 1.
- the hole transport layer 5 is formed from an electrolyte solution, for example, the electron transport layer 1 and the second electrode 6 are sealed with a sealing material between the electron transport layer 1 and the second electrode 6.
- the hole transport layer 5 can be formed by filling the electrolyte solution in the gap between the second electrode 6. At this time, a part of the electrolyte solution penetrates into the electron transport layer 1, so that the organic compound constituting the electron transport layer 1 swells, and thereby the gel layer 2 can be formed.
- the organic compound and the electrolyte solution of the electron transport layer 1 form the gel layer 2, thereby increasing the reaction interface, and further, the conductive additive 3 is contained in the gel layer 2. Therefore, the electron transport property in the electron transport layer 1 is improved, so that the light-electric conversion efficiency of the photoelectric element is improved.
- the photoelectric element functions as a photoelectric conversion element as in the case where the photoelectric element is configured as a dye-sensitized photoelectric conversion element
- the first base 7 side to the photoelectric element is When light is irradiated through the electrode 4, the sensitizing dye absorbs light and is excited, and the generated excited electrons flow into the electron transport layer 1 and are taken out through the first electrode 4 and sensitized. Holes in the dye are taken out from the hole transport layer 5 through the second electrode 6.
- the reaction interface becomes sufficiently wide, and the conduction aid 3 exists in the gel layer 2.
- the electrons generated in the electrode quickly move to the electrode 4 through the conductive additive 3, so that recombination of electrons and holes is suppressed, thereby improving the electron transport characteristics in the electron transport layer 1, and the photoelectric element.
- the conversion efficiency between light and electricity is improved.
- the thickness of the electron transport layer 1 is thick, the recombination suppressing effect due to the presence of the conductive additive 3 is more effectively exhibited. For this reason, the current value is improved as the light absorption amount increases, The conversion efficiency of the electric element is further improved.
- the roughness factor of the conductive additive 3 is the surface area of the conductive material obtained by the nitrogen adsorption method, the actual surface area of the conductive additive 3, and the projected area of the porous conductive film composed of this conductive material.
- orange microcrystals of p-hydrogalvinoxyl styrene (1.54 g; 2.93 mmol) indicated by the symbol “3” in [Chemical Formula 25] were obtained.
- a conductive glass substrate having a thickness of 0.7 mm and a sheet resistance of 100 ⁇ / ⁇ was prepared as the first base material 7 provided with the first electrode 4.
- This conductive glass substrate is composed of a glass substrate and a coating film made of fluorine-doped SnO 2 laminated on one surface of the glass substrate, the glass substrate being the first substrate 7 and the coating film being the first. Electrode 4.
- the roughness factor of the coating film is 1.5.
- the electron transport layer 1 was immersed in an acetonitrile saturated solution of a sensitizing dye (D131) represented by [Chemical Formula 26] for 1 hour.
- a sensitizing dye D131
- a conductive glass substrate having the same configuration as the conductive glass substrate in the formation of the electron transport layer 1 was prepared.
- the chloroplatinic acid is dissolved in isopropyl alcohol so that its concentration is 5 mM, and the obtained solution is spin-coated on the coating film of the conductive glass substrate, and then baked at 400 ° C. for 30 minutes.
- the electrode 6 was formed.
- the conductive glass substrate provided with the electron transport layer 1 and the conductive glass substrate provided with the second electrode 6 are arranged so that the electron transport layer 1 and the second electrode 6 face each other.
- a hot-melt adhesive having a width of 1 mm and a thickness of 50 ⁇ m (manufactured by DuPont, Binnel) was interposed at the outer edge between them.
- the two conductive glass substrates were bonded via the hot melt adhesive by pressing the two conductive glass substrates in the thickness direction while heating the hot melt adhesive.
- a void serving as an electrolyte injection port was formed.
- an electrolytic solution was filled between the electron transport layer 1 and the second electrode 6 from the injection port.
- the injection port was filled by irradiating UV light to cure the UV curable resin.
- the hole transport layer 5 made of an electrolytic solution is formed, and the electrolytic solution penetrates into the electron transport layer 1 to swell the organic compound (galbi polymer) constituting the electron transport layer 1 to form the gel layer 2.
- the electrolyte 2,2,6,6-tetramethylpiperidine-1-oxyl was 1 M, sensitizing dye (D131) was 2 mM, LiTFSI was 0.5 M, and N-methylbenzimidazole was 1.6 M in concentration.
- Acetonitrile solution contained in The photoelectric element was produced by the above.
- Example 2 In Example 1, when forming the conductive additive 3 and the electron transport layer 1, a rod-like (fiber-like) conductive material (Mitsui Metal Mining, TYPE-V, average axial ratio 8.0, A liquid in which an average minor axis diameter of 1 ⁇ m) was dispersed at a concentration of about 5% by mass was prepared and used. Otherwise, the photoelectric device was fabricated in the same manner as in Example 1.
- the conductivity aid 3 made of a rod-like (fibrous) conductive material has a roughness factor of 150 and a porosity of 60%.
- Example 3 In forming the electron transport layer 1, first, tin oxide (average particle diameter 20 nm ⁇ ) was dispersed in a terpineol solution containing 20% by mass of ethyl cellulose so that the concentration thereof was 20% by mass to prepare a tin oxide paste. This tin oxide paste was applied onto a conductive glass substrate having the same structure as in Example 1, and baked at 450 ° C. for 30 minutes, thereby producing a conductive additive 3 made of a porous conductive film having a thickness of 3 ⁇ m.
- the conductivity aid 3 has a roughness factor of 500 and a porosity of 40%.
- Example 1 a solution was prepared by dissolving the galbi polymer in Example 1 (symbol “4” in [Chemical Formula 25]) in chlorobenzene so that its concentration was 2 mass%.
- This solution was spin-coated on the porous conductive film at 500 rpm and dried at 60 ° C. under 0.01 MPa for 1 hour to form the electron transport layer 1.
- This electron transport layer 1 was immersed in a saturated solution of sensitizing dye (D131) represented by [Chemical Formula 26] in acetonitrile for 1 hour.
- D131 sensitizing dye represented by [Chemical Formula 26] in acetonitrile for 1 hour.
- Example 4 In forming the conductive additive 3, the conductive additive 3 made of a porous conductive film having a thickness of 10 ⁇ m was produced in the same manner as in Example 3.
- the conductivity aid 3 has a roughness factor of 2000 and a porosity of 40%.
- an electron transport layer 1 was formed in the same manner as in Example 3 using a solution in which a galbi polymer (sign “4” in [Chemical Formula 25]) was dissolved in 2% by mass of chlorobenzene.
- Example 5 In forming the electron transport layer 1, first, a dimethylformamide solution having a concentration of polyvinyl acetate (molecular weight of 500,000) of 14% by mass was prepared, and this was designated as solution A. Further, 13.5 g of tin chloride hydrate was dissolved in 100 ml of ethanol and refluxed for 3 hours to prepare a tin oxide sol. And A liquid and B liquid were mixed by mass ratio 0.8: 1, and the liquid obtained by stirring for 6 hours was made into C liquid. This C liquid was apply
- the conductive support material 3 which consists of a 1-micrometer-thick porous electrically conductive material comprised with a fibrous conductive material with an average outer diameter (short-axis diameter) of 100 nm was produced.
- An electron micrograph of the porous conductive film in plan view is shown in FIG.
- the conductivity aid 3 has a roughness factor of 200 and a porosity of 80%.
- Example 1 a solution in which the galbi polymer in Example 1 (symbol “4” in [Chemical Formula 25]) was dissolved in 2 mass% chlorobenzene was prepared. This solution was spin-coated on a porous conductive film at 500 rpm, and dried at 60 ° C. and 0.01 MPa for 1 hour to form an electron transport layer 1.
- the electron transport layer 1 was immersed in a saturated solution of sensitizing dye (D131) represented by [Chemical Formula 24] in acetonitrile for 1 hour.
- Example 1 In Example 1, a photoelectric element was produced in the same manner as in Example 1 except that ITO particles were not used. Note that the roughness factor of the first electrode 4 made of the coating film is 1.5 as in the first embodiment.
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Abstract
Description
ゲル乾燥体とは、ゲル層2を乾燥させたものを指す。ゲル層2を乾燥させるとは、ゲル層2に内包される溶液の除去すること、特には溶媒を除去することを指す。ゲル層2を乾燥させる方法としては、加熱による方法、真空環境中で溶液または溶媒を除去する方法、別の溶媒を利用してゲル層2に内包される溶液又は溶媒を除去する方法などが挙げられる。
(Xi)nはゲル部位を示し、Xiはゲル部位を構成する化合物のモノマーを示す。ゲル部位はポリマー骨格から形成され得る。モノマーの重合度nは、n=1~10万の範囲が好ましい。Yは(Xi)nに結合している酸化還元部を示す。j,kはそれぞれ1分子中に含まれる(Xi)n、Yの数を表す任意の整数であり、いずれも1~10万の範囲が好ましい。酸化還元部Yはゲル部位(Xi)nを形成するポリマー骨格のいかなる部位に結合していてもよい。酸化還元部Yは種類の異なる部位を含んでいてもよく、この場合は電子交換反応の観点から酸化還元電位が近い部位が好ましい。
(ガルビモノマーの合成)
反応容器内に、4-ブロモ-2,6-ジ-tert-ブチルフェノール(135.8g;0.476mol)と、アセトニトリル(270ml)とを入れ、さらに不活性雰囲気下で、N,O-ビス(トリメチルシリル)アセトアミド(BSA)(106.3g;129.6ml)を加え、70℃で終夜撹拌することで、完全に結晶が析出するまで反応さえた。析出した白色結晶を濾過し、真空乾燥した後、エタノールで再結晶して精製することによって、[化25]において符号「1」で示す、(4-ブロモ-2,6-ジ-tert-ブチルフェノキシ)トリメチルシラン(150.0g;0.420mol)の白色板状結晶を得た。
上記ガルビモノマーの合成で得られたガルビモノマー(p-ヒドロガルビノキシルスチレン)1gと、テトラエチレングリコールジアクリレート57.7mgと、アゾビスイソブチロニトリル15.1mgを、テトラヒドロフラン2mlに溶解した後、窒素置換し、一晩還流することで、ガルビモノマーを重合させ、[化25]において符号「4」で示すガルビポリマーを得た。
第一の電極4が設けられた第一の基材7として、厚み0.7mm、シート抵抗100Ω/□の導電性ガラス基板を用意した。この導電性ガラス基板はガラス基板と、このガラス基板の一面に積層された、フッ素ドープされたSnO2からなるコーティング膜とから構成され、前記ガラス基板が第一の基板7、コーティング膜が第一の電極4となる。なお、前記コーティング膜のラフネスファクターは1.5である。
上記電子輸送層1の形成における導電性ガラス基板と同じ構成を有する導電性ガラス基板を用意した。
実施例1において、導電助材3及び電子輸送層1を形成する際、ITO粒子の代わりに棒状(繊維状)の導電性材料(三井金属鉱業製、TYPE-V、平均軸比8.0、平均短軸径1μm)を濃度約5質量%で分散させた液を調製して使用した。それ以外は実施例1と同様にして光電気素子を作製した。前記、棒状(繊維状)の導電性材料からなる導電助材3のラフネスファクターは150、空隙率は60%である。
電子輸送層1を形成するにあたり、まずエチルセルロースを20質量%含むターピネオール溶液に、酸化スズ(平均粒径20nmφ)をその濃度が20質量%となるように分散し、酸化スズペーストを調製した。この酸化スズペーストを、実施例1と同じ構成を有する導電性ガラス基板上に塗布し、450℃で30分間焼成し、厚み3μmの多孔質導電膜からなる導電助材3を作製した。この導電助材3のラフネスファクターは500、空隙率は40%である。
導電助材3を形成するにあたり、実施例3の場合と同じ手法で、厚み10μmの多孔質導電膜からなる導電助材3を作製した。この導電助材3のラフネスファクターは2000、空隙率は40%である。
電子輸送層1を形成するにあたり、まずポリビニルアセテート(分子量50万)の濃度が14質量%のジメチルホルムアミド溶液を調製し、これをA液とした。また、13.5gの塩化スズ水和物を100mlのエタノールに溶解し、3時間還流を行うことで酸化スズゾルを調製、これをB液とした。そして、A液とB液とを質量比0.8:1で混合し、6時間撹拌して得た液をC液とした。このC液を、導電性ガラス基板の透明電極上に、エレクトロスピニング法によって塗布し、450℃で30分間焼成した。これにより、平均外径(短軸径)100nmの繊維状導電材料で構成される、厚み1μmの多孔質導電膜からなる導電助材3を作製した。この多孔質導電膜の、平面視での電子顕微鏡写真を図2に示す。この導電助材3のラフネスファクターは200、空隙率は80%である。
実施例1において、ITO粒子を用いない以外は実施例1と同様にして光電気素子を作製した。尚、コーティング膜からなる第一の電極4のラフネスファクターは、実施例1と同様1.5である。
各実施例及び比較例で得られた光電気素子の平面視面積1cm2の領域に200ルックスの光を照射しながら、Keithley 2400source meter(ケースレイ社製の2400型汎用ソースメータ)を用いたIV測定により各光電気素子の開放電圧および短絡電流値を測定した。光源には蛍光灯(ラピッド蛍光灯FLR20S・W/M、パナソニック株式会社製)を使用し、25℃環境下での測定を行った。また、光電変換部1cm2が受光する条件において光電気素子の評価を行った。その結果を下記表1に示す。
2 ゲル層
3 導電助材
4 第一の電極
5 正孔輸送層
6 第二の電極
7 第一の基板
8 第二の基板
9 繊維状集電材
Claims (7)
- 第一の電極と、第二の電極と、前記第一の電極と前記第二の電極との間に挟まれている電子輸送層及び正孔輸送層と、電解質溶液と、導電助材とを備え、
前記電子輸送層が、繰り返し酸化還元が可能な酸化還元部を有する有機化合物を備え、
前記電解質溶液が前記酸化還元部の還元状態を安定化させる機能を有し、
前記有機化合物と前記電解質溶液とがゲル層を形成し、
前記導電助材が前記ゲル層内に存在していると共に前記導電助材の少なくとも一部が前記第一の電極と接していることを特徴とする光電気素子。 - 前記導電助材のラフネスファクターが5以上2000以下であることを特徴とする請求項1に記載の光電気素子。
- 前記導電助材が粒子状の導電性材料の連結体から構成されていることを特徴とする請求項1および2に記載の光電気素子。
- 前記導電助材が繊維状の導電性材料から構成されていることを特徴とする請求項1および2に記載の光電気素子。
- 前記繊維状の導電性材料の平均外径が50nm以上1000nm以下であることを特徴とする請求項4に記載の光電気素子。
- 前記繊維状の導電性材料から構成されている導電助材の空隙率が50%以上95%以下であることを特徴とする請求項4または5に記載の光電気素子。
- 前記繊維状の導電性材料の平均繊維長/平均繊維径比が1000以上であることを特徴とする請求項4乃至6のいずれかに記載の光電気素子。
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CN201180007780.7A CN102792515B (zh) | 2010-02-05 | 2011-02-04 | 光电元件 |
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JP5649716B2 (ja) | 2011-03-10 | 2015-01-07 | パナソニック株式会社 | 光電気素子 |
JP5957012B2 (ja) * | 2011-12-28 | 2016-07-27 | パナソニック株式会社 | 光電気素子 |
CN106571425B (zh) * | 2016-09-29 | 2019-07-19 | 湖北大学 | 一种基于ZnO-钙钛矿结构的紫外-可见可调光电探测器及其制备方法 |
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