WO2009087848A1 - 色素増感型太陽電池 - Google Patents
色素増感型太陽電池 Download PDFInfo
- Publication number
- WO2009087848A1 WO2009087848A1 PCT/JP2008/072409 JP2008072409W WO2009087848A1 WO 2009087848 A1 WO2009087848 A1 WO 2009087848A1 JP 2008072409 W JP2008072409 W JP 2008072409W WO 2009087848 A1 WO2009087848 A1 WO 2009087848A1
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- WIPO (PCT)
- Prior art keywords
- dye
- metal
- metal oxide
- layer
- solar cell
- Prior art date
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Images
Classifications
-
- 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
-
- 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
- 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
- H01G9/2095—Light-sensitive devices comprising a flexible sustrate
-
- 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
- H10K30/80—Constructional details
- H10K30/81—Electrodes
- H10K30/82—Transparent electrodes, e.g. indium tin oxide [ITO] electrodes
- H10K30/83—Transparent electrodes, e.g. indium tin oxide [ITO] electrodes comprising arrangements for extracting the current from the cell, e.g. metal finger grid systems to reduce the serial resistance of transparent electrodes
-
- 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
Definitions
- the present invention relates to a dye-sensitized solar cell.
- the present invention relates to a dye-sensitized solar cell having excellent photoelectric conversion efficiency and improved durability.
- the operating principle of a general dye-sensitized solar cell is as follows.
- the sensitizing dye adsorbed on the metal oxide semiconductor electrode absorbs sunlight to generate excited electrons.
- the excited electrons move to the metal oxide semiconductor and further pass through the transparent conductive film. It moves to the counter electrode through the circuit to be connected.
- the electrons that have moved to the counter electrode reduce the electrolytic solution, and the electrolytic solution releases the electrons and reduces the sensitizing dye that is in an oxidized state.
- the electrolytic solution is in contact with the transparent conductive film, and excited electrons are injected from the transparent conductive film into the electrolytic solution.
- the open circuit voltage is lowered, resulting in a problem that the photoelectric conversion efficiency is lowered.
- the electrolyte solution containing an iodine redox there existed a subject that a conductive film corroded by electrolyte solution and durability deteriorated because the electrolyte solution is contacting the transparent conductive film.
- a metal oxide thin film such as indium-doped tin oxide (ITO) or fluorine-doped tin oxide (FTO) is formed on a substrate as a transparent conductive film by vapor deposition or sputtering. Is formed.
- ITO indium-doped tin oxide
- FTO fluorine-doped tin oxide
- this conventional transparent conductive film has a high material cost and manufacturing cost, and the above metal oxide constituting the transparent conductive film has a disadvantage that the resistivity is remarkably higher than that of a metal or the like. This was one of the reasons for the decrease in efficiency. Although the low efficiency can be lowered by increasing the thickness of the transparent conductive film, the light transmittance is lowered by this, and further, the material cost and the manufacturing cost are increased.
- the present invention is intended to solve the above-described conventional problems, and its purpose is to realize reverse photoelectric transfer and further improve the electrical conductivity of the electrode, thereby realizing excellent photoelectric conversion efficiency and durability. It is to provide a dye-sensitized solar cell that is remarkably excellent in properties, and to provide a dye-sensitized solar cell that is also suitable when a resin film is used as a base material.
- the problem of the present invention has been solved by providing an improved transparent conductive layer having a metal oxide intermediate layer and further having a metal current collecting layer. Specifically, it is as follows.
- a dye-sensitized solar cell comprising a metal oxide semiconductor layer composed of a semiconductor film having a dye adsorbed on the surface of a conductive substrate, a charge transfer layer, and a counter electrode, the conductive substrate And a metal oxide intermediate layer composed of metal oxide fine particles between the metal oxide semiconductor layer, and the conductive base material is a metal current collector layer composed of fine metal wires on a transparent base material and a conductive material
- a dye-sensitized solar cell comprising a transparent conductive layer containing a polymer.
- the present invention it is possible to provide a dye-sensitized solar cell that achieves excellent photoelectric conversion efficiency and remarkably excellent durability, and further suitable for use of a resin film as a base material.
- a sensitive solar cell could be provided.
- FIG. 1 is a schematic cross-sectional view showing the basic structure of the dye-sensitized solar cell of the present invention.
- the dye-sensitized solar cell of the present invention has a metal current collecting layer 11 and a transparent conductive layer 10 on a transparent substrate 50a as a conductive substrate, and a metal oxide intermediate layer thereon.
- a layer 60, a metal oxide semiconductor layer 20 composed of a semiconductor film having a dye adsorbed on its surface, and a charge transfer layer (sometimes referred to as an “electrolyte layer”) 30 are sequentially provided.
- 50 has a conductive layer 40 on the surface.
- the dye-sensitized solar cell of the present invention When the dye-sensitized solar cell of the present invention is irradiated with sunlight or an electromagnetic wave equivalent to sunlight, the dye adsorbed on the metal oxide semiconductor layer 20 is excited by absorbing the irradiated sunlight or electromagnetic wave. Electrons generated by excitation move from the metal oxide semiconductor layer 20 through the metal oxide intermediate layer 60 to the metal current collecting layer 11 and the transparent conductive layer 10, and then through the external circuit, the conductive layer of the counter electrode. 40, the redox electrolyte of the charge transfer layer 30 is reduced.
- the dye that has moved the electrons is an oxidant, but when the electrons are supplied from the counter electrode via the redox electrolyte of the charge transfer layer 30, it is reduced and returned to the original state, and at the same time The redox electrolyte of the moving layer 30 is oxidized and returns to a state where it can be reduced again by electrons supplied from the counter electrode. In this way, electrons flow and the dye-sensitized solar cell of the present invention can be configured.
- the dye-sensitized solar cell of the present invention has a metal oxide intermediate layer composed of metal oxide fine particles between a conductive substrate and a metal oxide semiconductor layer.
- the same metal oxide as that used for the metal oxide semiconductor layer described later can be used.
- the reverse current at the time of light irradiation is small, the forward electron transfer is increased, and high photoelectric conversion efficiency can be obtained, so that it is the same as the conduction band bottom potential of the metal oxide used for the metal oxide semiconductor layer.
- the metal oxide used for the metal oxide intermediate layer includes zirconium oxide, strontium titanate, niobium oxide, oxide Zinc is preferable, and strontium titanate and niobium oxide are more preferable.
- the thickness of the metal oxide intermediate layer is preferably 1 nm to 500 nm, more preferably 5 nm to 200 nm.
- the porosity of the metal oxide intermediate layer is preferably smaller than the porosity of the metal oxide semiconductor layer, specifically 20% or less, more preferably 10% or less. When the porosity of the metal oxide intermediate layer is reduced, not only is it difficult for electrons to move in the reverse direction, but also adhesion and durability with the conductive substrate are improved. Further, the metal oxide intermediate layer may have a laminated structure of two or more layers, and the composition, thickness, porosity and the like of the metal oxide fine particles to be formed can be arbitrarily controlled.
- the porosity means a porosity that is penetrable in the thickness direction of the dielectric, and can be measured using a commercially available device such as a mercury porosimeter (Shimadzu porer 9220 type).
- the method for producing the metal oxide intermediate layer is not particularly limited, and is a vacuum deposition method, ion sputtering method, cast method, coating method, spin coating method, spray method, aerosol deposition method (AD method), dipping method, electrolytic weight
- a vacuum deposition method ion sputtering method, cast method, coating method, spin coating method, spray method, aerosol deposition method (AD method), dipping method, electrolytic weight
- Various thin film forming methods such as a combination method, a photoelectrolytic polymerization method, and a pressure press method can be given.
- the vacuum vapor deposition method and the ion sputtering method can be performed under well-known conditions using a commercially available vapor deposition apparatus or sputtering apparatus.
- the coating method etc. it can carry out according to the coating method of the semiconductor fine particle of the metal oxide semiconductor layer mentioned later.
- methods, such as a pressure press method which does not require a high temperature heating process can be applied preferably.
- the conductive base material has a metal current collecting layer made of fine metal wires on a transparent base material and a transparent conductive layer containing a conductive polymer.
- Metal current collector layer There is no particular limitation on the shape of the metal current collecting layer made of fine metal wires, and the metal current collecting layer can be formed in a mesh shape, a stripe shape, or an arbitrary pattern. There are no particular limitations on the material of the fine metal wires, and any metal such as gold, silver, copper, platinum, aluminum, nickel, tungsten, or an alloy containing a plurality of these can be selected and used. In particular, from the viewpoint of conductivity or depending on the method for producing a thin wire, it is also one of preferred embodiments to use silver.
- the line width of the fine metal wire and the aperture ratio of the metal current collecting layer there is no particular limitation on the line width of the fine metal wire and the aperture ratio of the metal current collecting layer, and it can be arbitrarily controlled and applied.
- the line width decreases, the conductivity decreases, but the aperture ratio increases, and the light transmittance as a conductive substrate increases.
- the conductivity improves, but the aperture ratio decreases.
- the light transmittance as the conductive substrate is lowered.
- the line width of the fine metal wire is specifically preferably 5 ⁇ m or more and 20 ⁇ m or less, and more preferably 5 ⁇ m or more and 10 ⁇ m or less.
- wire width of a metal fine wire it can measure using the microscope etc. which have a ranging function.
- the aperture ratio of the metal current collecting layer is preferably 93% or more and 98% or less, and more preferably 95% or more and 98% or less.
- the aperture ratio can be calculated by analyzing an image taken with a microscope or the like and determining the area of the aperture.
- the interval between the fine metal wires is a factor that affects the aperture ratio, and can be set arbitrarily, but can usually be set in the range of 10 ⁇ m to 500 ⁇ m.
- the height of a metal fine wire when the whole smoothness is considered as an electroconductive base material, it is preferable that they are 1 micrometer or more and 10 micrometers or less.
- a method for forming a metal current collecting layer made of fine metal wires on a transparent substrate will be described.
- the method for forming the fine metal wire such as vacuum deposition, sputtering, ion plating, CVD, plasma CVD, or coating, ink jet, screen printing, aerosol deposition, and silver. Any method such as a salt method can be applied. Among these methods, it is preferable to apply an ink jet method or a silver salt method.
- a photoresist is coated on a transparent substrate, pattern exposure is performed through a mask, a portion corresponding to the fine metal wire pattern of the photoresist is removed by etching, and then, for example, the metal film is formed by sputtering. After the film is uniformly formed, the photoresist can be removed by a lift-off method to form a fine metal wire.
- a metal film is uniformly formed on the substrate, and then a photoresist is coated on the metal film, and after pattern exposure through a mask, the positive portion of the resist is dissolved and removed to be exposed. A method of forming a fine metal wire by removing the metal film by etching may be used.
- a metal particle that becomes a fine metal wire and a binder such as glass fine particles are mixed into a paste, and a predetermined pattern is formed by a method such as a coating method, an ink jet method, or a screen printing method. And a method of fusing metal particles by heating and baking.
- the firing temperature is preferably 600 ° C. or lower.
- the metal fine particles used when applying methods such as the coating method, ink jet method, and screen printing method, and various shapes of fine particles can be used. It is preferable to use nanowires or spherical particles, and it is more preferable to use nanowires.
- the size of the nanowire is not particularly limited, but the diameter is preferably 10 nm to 100 nm, and the wire length is preferably 10 ⁇ m to 100 ⁇ m.
- the electrostatic ink jet method can continuously print a high-viscosity liquid with high accuracy, and can be used for forming fine metal wires.
- a liquid discharge head having a nozzle having an internal diameter of 0.5 to 30 ⁇ m for discharging a charged liquid, supply means for supplying a solution into the nozzle, and a discharge voltage applied to the solution in the nozzle. It is preferably formed using a liquid ejection device provided with ejection voltage application means for applying. According to this method, there is no thickening of the intersection of the fine metal wires, and thinning is possible.
- Specific methods for forming fine metal wires using such electrostatic inkjet include, for example, a method of forming fine metal wires by electroless plating after applying a plating catalyst ink in a desired pattern, and ink containing fine metal particles. Or, a method of applying an ink containing a metal ion or metal complex ion and a reducing agent in a desired pattern, or applying a metal ion or metal complex ion-containing ink and a reducing agent-containing ink from different nozzles in a desired pattern. Can do.
- a metal fine particle-containing ink or an ink containing a metal ion or metal complex ion and a reducing agent is applied in a desired pattern, or a metal ion or metal complex ion-containing ink and a reducing agent-containing ink are applied from different nozzles in a desired pattern.
- the application method is more preferable because an additional step such as plating is not required.
- metal fine particles are contained. Since unevenness is less likely to occur on the surface of the fine metal wire than when ink is used, it can be most preferably used in applications where smoothness is required.
- the viscosity of the ink used in the electrostatic ink jet method is preferably 30 mPa ⁇ s or more, and more preferably 100 mPa ⁇ s or more.
- a layer containing silver halide grains is provided on a transparent substrate, and then exposed and developed in a desired pattern to form a metallic silver portion of the desired pattern, and further physical development It is a method of forming a silver fine wire by processing.
- a decrease in aperture ratio due to thickening of the intersection which can be a problem in the printing method, is less likely to occur, and it is possible to form dense silver lines, and it is preferable to apply the silver salt method It is one of.
- the silver halide emulsion contains a binder.
- the amount of the binder in the layer containing silver halide grains is 0.05 g / m 2. It is preferable that it is 0.25 g / m 2 or more.
- the Ag / binder ratio in the layer containing silver halide grains is preferably 0.3 or more and 0.8 or less by volume ratio.
- the silver halide grains are preferably silver chlorobromide grains, having a silver chloride content of 55 mol% to 95 mol% and a silver bromide content of 5 mol% to 45 mol%. Further preferred.
- JP-A-2006-352073 For details of exposure, development processing, and further physical development processing, the method described in JP-A-2006-352073 can be referred to.
- the fine metal wires may be plated or a corrosion prevention layer for preventing corrosion due to the electrolyte may be provided.
- the plating treatment it can be performed under arbitrary conditions by an electrolytic plating method or an electroless plating method.
- a corrosion prevention layer it is possible to apply a metal such as titanium, nickel, or aluminum, or an alloy thereof, and further apply an amorphous or crystalline insulating layer as the corrosion prevention layer.
- the transparent conductive layer according to the present invention contains a conductive polymer.
- a conductive polymer By containing a conductive polymer, it is possible to make a surface electrode with little loss even if it has a large area, especially when using a resin film as a transparent substrate, it is bent compared to inorganic conductive films such as ITO It can be set as a highly conductive substrate.
- the conductive polymer contained in the transparent conductive layer it is possible to use polymers having various known structures, such as polypyrrole, polyindole, polycarbazole, polythiophene, polyaniline, polyacetylene, polyfuran. , Polyparaphenylene vinylene, polyazulene, polyparaphenylene, polyparaphenylene sulfide, polyisothianaphthene, polythiazyl, polyacene, and other conductive polymers can be used. Among these, polyethylene dioxythiophene and polyaniline are preferable from the viewpoint of conductivity and transparency.
- the above long-chain sulfonic acid is preferable.
- Examples of the long chain sulfonic acid include dinonyl naphthalene disulfonic acid, dinonyl naphthalene sulfonic acid, and dodecylbenzene sulfonic acid.
- Examples of the halogen include Cl 2 , Br 2 , I 2 , ICl 3 , IBr, IF 5 and the like.
- Examples of the Lewis acid include PF 5 , AsF 5 , SbF 5 , BF 3 , BCl 3 , BBr 3 , SO 3 , and GaCl 3 .
- Examples of the protonic acid include HF, HCl, HNO 3 , H 2 SO 4 , HBF 4 , HClO 4 , FSO 3 H, ClSO 3 H, CF 3 SO 3 H, and the like.
- the transition metal halide NbF 5, TaF 5, MoF 5, WF 5, RuF 5, BiF 5, TiCl 4, ZrCl 4, MoCl 5, MoCl 3, WCl 5, FeCl 3, TeCl 4, SnCl 4, SeCl 4 , FeBr 3 , SnI 5 and the like.
- the transition metal compound AgClO 4, AgBF 4, La (NO 3) 3, Sm (NO 3) 3 and the like.
- Examples of the alkali metal include Li, Na, K, Rb, and Cs.
- Examples of the alkaline earth metal include Be, Mg, Ca, Sc, and Ba.
- the dopant for the conductive polymer may be introduced into fullerenes such as hydrogenated fullerene, hydroxylated fullerene, and sulfonated fullerene.
- the dopant is preferably contained in an amount of 0.01 parts by mass or more, and more preferably 0.5 parts by mass or more with respect to 100 parts by mass of the conductive polymer.
- a water-soluble organic compound may be contained in the transparent conductive layer in addition to the conductive polymer.
- a water-soluble organic compound which can be used by this invention, It can select suitably from well-known things, For example, an oxygen containing compound is mentioned suitably.
- the oxygen-containing compound is not particularly limited as long as it contains oxygen, and examples thereof include an acid group-containing compound, a carbonyl group-containing compound, an ether group-containing compound, and a sulfoxide group-containing compound.
- examples of the hydroxyl group-containing compound include ethylene glycol, diethylene glycol, propylene glycol, trimethylene glycol, 1,4-butanediol, glycerin and the like.
- the carbonyl group-containing compound include isophorone, propylene carbonate, cyclohexanone, ⁇ -butyrolactone, and the like.
- the ether group-containing compound include diethylene glycol monoethyl ether.
- Examples of the sulfoxide group-containing compound include dimethyl sulfoxide. Among these, it is particularly preferable to use at least one selected from dimethyl sulfoxide, ethylene glycol, and diethylene glycol. Moreover, these may be used individually by 1 type and may use 2 or more types together.
- the content of the water-soluble organic compound with respect to 100 parts by mass of the conductive polymer is preferably 0.001 part by mass or more, more preferably 0.01 to 50 parts by mass, and particularly preferably 0.01 to 10 parts by mass.
- the method for forming the transparent conductive layer is not particularly limited, and a known method for forming a conductive polymer layer can be arbitrarily applied. However, a coating liquid containing a conductive polymer or a dopant is prepared. A method of coating this on a transparent substrate or a metal current collecting layer is preferred.
- a conductive substrate according to the present invention as long as it has a metal current collecting layer composed of fine metal wires on a transparent substrate, and a transparent conductive layer containing a conductive polymer, there is no particular limitation in the order of the configuration,
- the transparent conductive layer may be formed after the metal current collecting layer is first formed on the transparent substrate, or the metal current collecting layer may be formed after the transparent conductive layer is first formed.
- the transparent conductive layer is formed after the metal current collector layer is first formed on the transparent substrate.
- the transparent conductive layer covers the opening of the metal current collecting layer and the upper part of the thin metal wire so that the uppermost surface of the conductive substrate is smooth and the surface of the fine metal wire does not come into contact with the electrolyte. Most preferably it is applied.
- the smoothing in the present invention specifically means that the arithmetic average roughness Ra defined by JIS B-0601 is 1 ⁇ m or less.
- the measurement of the average roughness for example, an RSTPLUS non-contact three-dimensional micro surface shape measurement system manufactured by WYKO can be used.
- the film thickness of the transparent conductive layer is preferably from 0.01 ⁇ m to 5 ⁇ m, more preferably from 0.05 ⁇ m to 2.0 ⁇ m.
- the transparent conductive layer covers the upper part of the metal current collecting layer, it is preferable that the upper part of the thin metal wire has this film thickness.
- the conductive substrate used in the dye-sensitized solar cell of the present invention is a mode in which a metal current collecting layer and a transparent conductive film are used in combination, and the surface resistance value can be controlled to be low.
- the surface resistance value is preferably 10 ⁇ / ⁇ or less, more preferably 5 ⁇ / ⁇ or less, and particularly preferably 1 ⁇ / ⁇ or less.
- the surface resistivity can be measured, for example, according to JIS K6911, ASTM D257, etc., and can be measured using a commercially available surface resistivity meter.
- Transparent substrate As the transparent substrate used for the conductive substrate used in the dye-sensitized solar cell of the present invention, a glass plate or a resin film can be used.
- the resin film include polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate, polyolefins such as polyethylene (PE), polypropylene (PP), polystyrene and cyclic olefin resins, polyvinyl chloride, poly Vinyl resins such as vinylidene chloride, polyether ether ketone (PEEK), polysulfone (PSF), polyether sulfone (PES), polycarbonate (PC), polyamide, polyimide, acrylic resin, triacetyl cellulose (TAC), etc. are used. be able to.
- PET polyethylene terephthalate
- PP polypropylene
- PES polystyrene and cyclic olefin resins
- polyvinyl chloride poly Vinyl resins such as vinylidene chloride, polyether ether ketone (PEEK), polysulfone (PSF), polyether sulfone (PES), polycarbonate (PC), poly
- a biaxially stretched polyethylene terephthalate film, an acrylic resin film, and a triacetyl cellulose film are preferable, and a biaxially stretched polyethylene terephthalate film is preferable. Most preferred.
- Metal oxide semiconductor layer The metal oxide semiconductor layer according to the present invention will be described.
- the metal oxide constituting the metal oxide semiconductor layer according to the present invention is not particularly limited as long as it is a semiconductor that receives electrons generated by light irradiation with a dye adsorbed on the semiconductor and transmits the electrons to a conductive substrate.
- Various metal oxides used in the dye-sensitized solar cell can be used.
- various metal oxide semiconductors such as titanium oxide, zirconium oxide, zinc oxide, vanadium oxide, niobium oxide, tantalum oxide, tungsten oxide, strontium titanate, calcium titanate, magnesium titanate, barium titanate, niobium
- metal oxide semiconductors such as potassium oxide and strontium tantalate, transition metal oxides such as magnesium oxide, strontium oxide, aluminum oxide, cobalt oxide, nickel oxide and manganese oxide, cerium oxide, gadolinium oxide, samarium oxide, ytterbium oxide And metal oxides such as lanthanoid oxides, and inorganic insulators such as natural or synthetic silicate compounds represented by silica.
- the metal oxide particles may have a core-shell structure or may be doped with a different metal element, and a metal oxide having an arbitrary structure and composition can be applied.
- the average particle diameter of the metal oxide particles is preferably 10 nm to 300 nm, more preferably 10 nm to 100 nm.
- the shape of the metal oxide is not particularly limited, and may be spherical, acicular or amorphous crystals.
- the method for forming metal oxide particles is not particularly limited, and various liquid phase methods such as hydrothermal reaction method, sol-gel method / gel sol method, colloid chemical synthesis method, coating pyrolysis method, spray pyrolysis method, and chemical vapor phase It can be formed using various gas phase methods such as a precipitation method.
- a known method can be applied.
- (1) Suspension containing metal oxide fine particles or a precursor thereof (2) A method for forming a semiconductor layer by drying and baking, and (2) immersing the conductive substrate in a colloidal solution and subjecting the metal oxide semiconductor particles to a conductive group by electrophoresis.
- Electrophoretic electrodeposition method that adheres to the material, (3) A method in which a colloidal solution or dispersion is mixed and applied with a foaming agent, and then sintered to make it porous.
- a polymer microbead is mixed and applied. After that, a method of removing the polymer microbeads by heat treatment or chemical treatment to form voids and making it porous can be applied.
- a known method can be applied particularly as a coating method, and examples thereof include a screen printing method, an ink jet method, a roll coating method, a doctor blade method, a spin coating method, and a spray coating method. Can do.
- the particle diameter of the metal oxide fine particles in the suspension is preferably fine and is preferably present as primary particles.
- the suspension containing the metal oxide fine particles is prepared by dispersing the metal oxide fine particles in a solvent, and the solvent is not particularly limited as long as the metal oxide fine particles can be dispersed, and water, Organic solvents, mixtures of water and organic solvents are included.
- the organic solvent alcohols such as methanol and ethanol, ketones such as methyl ethyl ketone, acetone and acetyl acetone, hydrocarbons such as hexane and cyclohexane, and the like are used.
- a surfactant and a viscosity modifier can be added to the suspension as necessary.
- concentration range of the metal oxide fine particles in the solvent is preferably 0.1 to 70% by mass, and more preferably 0.1 to 30% by mass.
- the suspension containing the metal oxide core fine particles obtained as described above is applied onto a conductive substrate, dried, etc., and then baked in air or in an inert gas to be conductive.
- a metal oxide semiconductor layer is formed on the conductive substrate.
- the semiconductor layer obtained by applying and drying the suspension on the conductive substrate is composed of an aggregate of metal oxide fine particles, and the particle size of the fine particles corresponds to the primary particle size of the metal oxide fine particles used. To do. Since the metal oxide semiconductor layer formed on the conductive base material has low bonding strength with the conductive base material and fine particles, and the mechanical strength is low, this metal oxide fine particle assembly
- the body film is preferably fired to increase the mechanical strength, and is preferably a fired product film that is strongly fixed to the substrate.
- the metal oxide semiconductor layer may have any structure, but is preferably a porous structure film (also referred to as a porous layer having voids).
- the porosity of the metal oxide semiconductor layer is preferably 0.1 to 20% by volume, and more preferably 5 to 20% by volume.
- the porosity of the metal oxide semiconductor layer means a porosity that is penetrating in the thickness direction of the dielectric, and can be measured using a commercially available apparatus such as a mercury porosimeter (Shimadzu porer 9220 type).
- the thickness of the metal oxide semiconductor layer is preferably at least 10 nm or more, and more preferably 100 to 10,000 nm.
- the firing temperature is preferably lower than 1000 ° C., and more preferably in the range of 200 to 800 ° C. preferable.
- the metal oxide semiconductor layer is formed on the metal oxide intermediate layer as described above, the metal oxide semiconductor layer is formed on the metal oxide semiconductor film as necessary for the purpose of improving electronic conductivity. May be subjected to a surface treatment with a metal oxide.
- the surface treatment composition is preferably the same type of composition as that of the metal oxide forming the metal oxide semiconductor layer, particularly from the viewpoint of electron conductivity between the metal oxide fine particles.
- a metal oxide precursor to be surface treated is applied to the semiconductor film, or the semiconductor film is a precursor.
- a surface treatment made of a metal oxide can be performed by immersing in a body solution and further performing a firing treatment as necessary.
- the surface treatment is performed by using an electrochemical treatment using a titanium tetrachloride aqueous solution or titanium alkoxide which is a precursor of titanium oxide, or using a precursor of an alkali metal titanate or an alkaline earth titanate metal.
- the firing temperature and firing time at this time are not particularly limited and can be arbitrarily controlled, but are preferably 200 ° C. or lower.
- the dye adsorbed on the surface of the metal oxide semiconductor layer described above has absorption in various visible light regions or infrared light regions, and has a lowest vacancy level higher than the conduction band of the metal oxide semiconductor.
- dyes can be used.
- azo dyes for example, azo dyes, quinone dyes, quinone imine dyes, quinacridone dyes, squarylium dyes, cyanine dyes, cyanidin dyes, merocyanine dyes, triphenylmethane dyes, xanthene dyes, porphyrin dyes, perylene dyes
- examples thereof include dyes, indigo dyes, phthalocyanine dyes, naphthalocyanine dyes, rhodamine dyes, rhodanine dyes, and the like.
- Metal complex dyes are also preferably used.
- Various metals such as Tc, Te, and Rh can be used.
- polymethine dyes such as cyanine dyes, merocyanine dyes, and squarylium dyes are one of the preferred embodiments.
- JP-A-11-35836, JP-A-11-67285, JP-A-11- No. 86916, JP-A-11-97725, JP-A-11-158395, JP-A-11-163378, JP-A-11-214730, JP-A-11-214731, JP-A-11-238905 examples thereof include dyes described in each specification such as JP-A No. 2004-207224, JP-A No. 2004-319202, European Patent Nos. 892,411 and 911,841.
- a metal complex dye is also one preferred embodiment, and a metal phthalocyanine dye, a metal porphyrin dye or a ruthenium complex dye is preferable, and a ruthenium complex dye is particularly preferable.
- ruthenium complex dyes include U.S. Pat. Nos. 4,927,721, 4,684,537, 5,084,365, 5,350,644, No. 5,463,057, No. 5,525,440, JP-A-7-249790, JP-A-10-504512, WO98 / 50393, JP2000- Examples include complex dyes described in Japanese Patent No. 26487, Japanese Patent Application Laid-Open No. 2001-223037, Japanese Patent Application Laid-Open No. 2001-226607, Japanese Patent No. 3430254, and the like.
- a rhodanine dye as the dye adsorbed on the surface of the metal oxide.
- Any structure can be preferably used as long as it is a rhodanine-based dye.
- at least a compound represented by the following general formula (1) or a compound represented by the following general formula (2) is preferred. It is particularly preferable to use one type.
- R 11 represents a substituent
- n represents an integer of 0 to 4.
- X 11 to X 14 each represents an oxygen atom, a sulfur atom or a selenium atom
- R 12 and R 13 each represents a hydrogen atom or a substituent.
- R 14 represents a carboxy group or a phosphono group
- L 11 represents a divalent linking group.
- R 15 represents an alkyl group.
- R 21 represents a substituent
- n represents an integer of 0 to 4.
- X 21 to X 26 each represents an oxygen atom, a sulfur atom or a selenium atom
- R 22 and R 23 each represents a hydrogen atom or a substituent.
- R 24 and R 26 each represent a hydrogen atom, a carboxy group or a phosphono group, and at least one of R 24 and R 26 represents a carboxy group or a phosphono group.
- L 21 and L 22 each independently represent a divalent linking group.
- R 25 represents an alkyl group.
- the compound represented by the general formula (1) (dye) and the compound represented by the general formula (2) (dye) are derived from the compound in addition to the compound represented by the general formula.
- Ions and salts For example, when the molecular structure has a sulfonic acid group (sulfo group), it is formed by an anion generated by dissociation of the sulfonic acid group in addition to the compound, and the anion and a counter cation. Salt.
- Such a salt may be a salt formed with a metal ion such as sodium salt, potassium salt, magnesium salt, calcium salt, or the like, such as pyridine, piperidine, triethylamine, aniline, diazabicycloundecene, etc. It may be a salt formed with an organic base.
- a metal ion such as sodium salt, potassium salt, magnesium salt, calcium salt, or the like, such as pyridine, piperidine, triethylamine, aniline, diazabicycloundecene, etc. It may be a salt formed with an organic base.
- a compound having a basic group in the molecule a cation produced by protonation of the compound, and a hydrochloride, sulfate, acetate, methylsulfonate, p-toluenesulfonate, etc. Also included are salts formed with acids.
- the compound represented by the general formula (1) and the compound represented by the general formula (2) are, for example, “Cyanine Soybean and Related Compounds” (1964, Inter Science Published by Publishers), U.S. Pat. Nos. 2,454,629, 2,493,748, JP-A-6-301136, JP-A-2003-203684, etc. Can be synthesized with reference to the method.
- These compounds preferably have a large extinction coefficient and are stable against repeated redox reactions.
- the compound (dye) is preferably chemically adsorbed on the metal oxide semiconductor, and has a functional group such as a carboxy group, a sulfonic acid group, a phosphoric acid group, an amide group, an amino group, a carbonyl group, or a phosphine group. It is preferable to have.
- two or more kinds of dyes can be used together or mixed.
- the dye to be used or mixed and the ratio thereof can be selected so as to match the wavelength range and intensity distribution of the target light source.
- the charge transfer layer is a layer containing a charge transport material having a function of replenishing electrons to the oxidant of the dye.
- charge transport materials that can be used in the present invention include a solvent in which a redox counter ion is dissolved, an electrolytic solution such as a room temperature molten salt containing the redox counter ion, and a solution of the redox counter ion as a polymer. Examples thereof include a gel-like quasi-solidified electrolyte impregnated with a matrix, a low-molecular gelling agent, and the like, and a polymer solid electrolyte.
- electron transport materials and hole transport materials can also be used as materials whose carrier transport in solids is involved in electrical conduction, and these can be used in combination. Is possible.
- the redox counter ion contained is not particularly limited as long as it can be used in a generally known solar cell or the like.
- a redox counter ion such as I ⁇ / I 3 ⁇ and Br 2 ⁇ / Br 3 ⁇
- ferrocyanate / ferricyanate ferrocyanate / ferricyanate
- ferrocene / ferricinium ion cobalt Metal redox systems such as metal complexes such as complexes, organic redox systems such as alkylthiol-alkyldisulfides, viologen dyes, hydroquinones / quinones, sulfur compounds such as sodium polysulfide, alkylthiols / alkyldisulfides, etc. .
- iodine-based compounds More specifically as iodine-based compounds, combinations of iodine and metal iodides such as LiI, NaI, KI, CsI, and CaI 2, and quaternary ammonium compounds such as tetraalkylammonium iodide, pyridinium iodide, imidazolium iodide, etc. And combinations with iodine salts of quaternary imidazolium compounds.
- iodine and metal iodides such as LiI, NaI, KI, CsI, and CaI 2
- quaternary ammonium compounds such as tetraalkylammonium iodide, pyridinium iodide, imidazolium iodide, etc.
- quaternary ammonium compounds such as tetraalkylammonium iodide, pyridinium iodide, imidazol
- bromine-based combinations include bromine and metal bromides such as LiBr, NaBr, KBr, CsBr, and CaBr 2 , and combinations of tetraalkylammonium bromide, pyridinium bromide, and the like with quaternary ammonium compounds such as bromine salts. Can be mentioned.
- a solvent As a solvent, it is an electrochemically inert compound that has low viscosity and improved ion mobility, or has a high dielectric constant and improved effective carrier concentration, and can exhibit excellent ionic conductivity. Is desirable.
- carbonate compounds such as dimethyl carbonate, diethyl carbonate, ethylene carbonate and propylene carbonate, heterocyclic compounds such as 3-methyl-2-oxazolidinone, ether compounds such as dioxane and diethyl ether, ethylene glycol dialkyl ether, propylene glycol dialkyl Ethers, chain ethers such as polyethylene glycol dialkyl ether, polypropylene glycol dialkyl ether, alcohols such as methanol, ethanol, ethylene glycol monoalkyl ether, propylene glycol monoalkyl ether, polyethylene glycol monoalkyl ether, polypropylene glycol monoalkyl ether, Ethylene glycol, diethylene glycol, triethyl Polyhydric alcohols such as ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, glycerin, nitrile compounds such as acetonitrile, glutaronitrile, propionitrile, methoxy
- a preferable electrolyte concentration is 0.1 to 15M, and more preferably 0.2 to 10M.
- a preferable concentration of iodine is 0.01 to 0.5M.
- the molten salt electrolyte is preferable from the viewpoint of achieving both photoelectric conversion efficiency and durability.
- Examples of the molten salt electrolyte include International Publication No. 95/18456, JP-A-8-259543, JP-A-2001-357896, Electrochemistry, Vol. 65, No. 11, page 923 (1997) and the like.
- electrolytes containing known iodine salts such as pyridinium salts, imidazolium salts, and triazolium salts described in (1). These molten salt electrolytes are preferably in a molten state at room temperature, and it is preferable not to use a solvent.
- Gels prepared by adding an electrolyte or electrolyte solution to an oligomer or polymer matrix, polymer addition, addition of low-molecular gelling agent or oil gelling agent, polymerization including polyfunctional monomers, polymer cross-linking reaction, etc. (Pseudo-solidification) can also be used.
- polyacrylonitrile and polyvinylidene fluoride can be preferably used.
- a preferred compound is a compound having an amide structure in the molecular structure.
- preferred crosslinkable reactive groups are nitrogen-containing heterocycles (for example, pyridine ring, imidazole ring, thiazole ring, oxazole ring, triazole ring, morpholine ring, piperidine ring, piperazine ring, etc.), and preferred crosslinking agents Is a bifunctional or more functional reagent (for example, alkyl halide, halogenated aralkyl, sulfonate, acid anhydride, acid chloride, isocyanate, etc.) capable of electrophilic reaction with a nitrogen atom.
- the concentration of the electrolyte is usually 0.01 to 99% by mass, preferably about 0.1 to 90% by mass.
- an electrolyte composition containing an electrolyte and metal oxide particles and / or conductive particles can also be used.
- the metal oxide particles TiO 2, SnO 2, WO 3, ZnO, ITO, BaTiO 3, Nb 2 O 5, In 2 O 3, ZrO 2, Ta 2 O 5, La 2 O 3, SrTiO 3, Y
- the metal oxide particles include one or a mixture of two or more selected from the group consisting of 2 O 3 , Ho 2 O 3 , Bi 2 O 3 , CeO 2 , and Al 2 O 3 . These may be doped with impurities or complex oxides.
- the conductive particles include those made of a substance mainly composed of carbon.
- the polymer electrolyte is a solid substance capable of dissolving the redox species or binding with at least one substance constituting the redox species, for example, polyethylene oxide, polypropylene oxide, polyethylene succinate, A polymer compound such as poly- ⁇ -propiolactone, polyethyleneimine, polyalkylene sulfide or a cross-linked product thereof, polyphosphazene, polysiloxane, polyvinyl alcohol, polyacrylic acid, polyalkylene oxide, Examples include those obtained by adding an ether segment or an oligoalkylene oxide structure as a side chain, or copolymers thereof. Among them, those having an oligoalkylene oxide structure as a side chain, and those having a polyether segment as a side chain are particularly preferred. Shall is preferable.
- a method of polymerizing in the coexistence of a monomer that becomes a polymer compound and a redox species a solid such as a polymer compound is dissolved in a solvent as necessary. Then, the above-mentioned method of adding the redox species can be used.
- the content of the redox species can be appropriately selected according to the required ion conduction performance.
- a solid hole transport material which is organic or inorganic or a combination of both can be used.
- Organic hole transport materials include aromatic amines and triphenylene derivatives, polyacetylene and derivatives thereof, poly (p-phenylene) and derivatives thereof, poly (p-phenylene vinylene) and derivatives thereof, polythienylene vinylene and derivatives thereof.
- Conductive polymers such as derivatives, polythiophene and derivatives thereof, polyaniline and derivatives thereof, polytoluidine and derivatives thereof can be preferably used.
- the hole transport material may be added with a compound containing a cation radical such as tris (4-bromophenyl) aminium hexachloroantimonate, or the potential control of the oxide semiconductor surface ( A salt such as Li [(CF 3 SO 2 ) 2 N] may be added to perform compensation of the space charge layer.
- a p-type inorganic compound semiconductor can be used as the inorganic hole transport material.
- the p-type inorganic compound semiconductor preferably has a band gap of 2 eV or more, and more preferably 2.5 eV or more.
- the ionization potential of the p-type inorganic compound semiconductor needs to be smaller than the ionization potential of the dye-adsorbing electrode from the condition that the holes of the dye can be reduced.
- the preferable range of the ionization potential of the p-type inorganic compound semiconductor varies depending on the dye used, it is generally preferably 4.5 to 5.5 eV, more preferably 4.7 to 5.3 eV.
- a preferred p-type inorganic compound semiconductor is a compound semiconductor containing monovalent copper, preferably CuI and CuSCN, and most preferably CuI.
- the preferred hole mobility of the charge transfer layer containing the p-type inorganic compound semiconductor is 10 ⁇ 4 to 10 4 m 2 / V ⁇ sec, more preferably 10 ⁇ 3 to 10 3 cm 2 / V ⁇ sec.
- the preferable conductivity of the charge transfer layer is 10 ⁇ 8 to 10 2 S / cm, and more preferably 10 ⁇ 6 to 10 S / cm.
- the method for forming the charge transfer layer between the semiconductor electrode and the counter electrode is not particularly limited.
- the charge transfer layer is formed by filling the electrolyte solution or various electrolytes described above to form a charge transfer layer, or by dropping or coating the electrolyte or various electrolytes on the semiconductor electrode or the counter electrode.
- a method of overlaying the other electrode on the top can be used.
- the semiconductor electrode is a portion from the conductive base material to the metal oxide semiconductor layer.
- the gap between the semiconductor electrode and the counter electrode is sealed with a film or resin as necessary, or the semiconductor electrode and the charge transfer It is also preferable to store the layer and the counter electrode in a suitable case.
- a normal pressure process using capillary action by dipping or the like, or a vacuum process in which the gas phase in the gap is replaced with a liquid phase at a pressure lower than normal pressure can be used.
- microgravure coating, dip coating, screen coating, spin coating or the like can be used as a coating method.
- the counter electrode is provided in an undried state and measures for preventing liquid leakage at the edge portion are taken.
- a gel electrolyte there is a method in which it is applied in a wet manner and solidified by a method such as polymerization. In this case, the counter electrode can be applied after drying and fixing.
- a charge transfer layer can be formed by a dry film forming process such as a vacuum deposition method or a CVD method, and then a counter electrode can be provided. Specifically, it can be introduced into the electrode by techniques such as vacuum deposition, casting, coating, spin coating, dipping, electropolymerization, and photoelectropolymerization. It is formed by evaporating the solvent by heating to an arbitrary temperature.
- the thickness of the charge transfer layer is preferably 10 ⁇ m or less, more preferably 5 ⁇ m or less, and further preferably 1 ⁇ m or less.
- the conductivity of the charge transfer layer is preferably 1 ⁇ 10 ⁇ 10 S / cm or more, more preferably 1 ⁇ 10 ⁇ 5 S / cm or more.
- the counter electrode that can be used in the present invention can utilize a single-layer structure of a substrate having conductivity as in the case of the conductive substrate described above, or a substrate having a conductive layer on the surface thereof.
- the conductive material and the base material used for the conductive layer, and the production method thereof are the same as those of the conductive base material described above, and various known materials and methods can be applied.
- a plastic sheet is used as a base material and a polymer material is applied as a conductive material.
- the thickness of the conductive layer is not particularly limited, but is preferably 3 nm to 10 ⁇ m.
- the thickness is preferably 5 ⁇ m or less, and more preferably in the range of 10 nm to 3 ⁇ m.
- the surface resistance of the counter electrode is preferably as low as possible. Specifically, the range of the surface resistance is preferably 50 ⁇ / ⁇ or less, more preferably 20 ⁇ / ⁇ or less, still more preferably 10 ⁇ / ⁇ or less. .
- the counter electrode Since light may be received from one or both of the conductive base material and the counter electrode described above, it is sufficient that at least one of the conductive base material and the counter electrode is substantially transparent. From the viewpoint of improving the power generation efficiency, it is preferable to make the conductive base material transparent so that light enters from the conductive base material side.
- the counter electrode preferably has a property of reflecting light. As such a counter electrode, glass or plastic deposited with a metal or a conductive oxide, or a metal thin film can be used.
- the counter electrode may be formed by directly applying, plating or vapor-depositing (PVD, CVD) a conductive material on the above-described charge transfer layer, or attaching a conductive layer side of the substrate or a single conductive substrate layer.
- PVD vapor-depositing
- CVD vapor-depositing
- the conductive layer as the counter electrode has electrical conductivity and acts catalytically for the reduction reaction of the redox electrolyte.
- glass or a polymer film obtained by evaporating platinum, carbon, rhodium, ruthenium, or the like or applying conductive fine particles can be used.
- Example 1 [Preparation of conductive substrate] ⁇ Production of Conductive Substrate CB-01 >> ⁇ Undercoat layer formation> A corona discharge treatment of 12 W ⁇ min / m 2 is applied to one side of a 200 ⁇ m thick biaxially stretched PET support, and the undercoat coating solution B-1 is applied to a dry film thickness of 0.1 ⁇ m, and 12 W is applied thereon. A corona discharge treatment of min / m 2 was performed, and the undercoating liquid B-2 was applied so as to have a dry film thickness of 0.06 ⁇ m. Thereafter, heat treatment was performed at 120 ° C. for 1.5 minutes to obtain an underdrawn PET film support.
- SnO 2 sol (A) 65 g of SnCl 4 .5H 2 O was dissolved in 2000 ml of distilled water to make a homogeneous solution, which was then boiled to obtain a precipitate. The produced precipitate is taken out by decantation and washed with distilled water many times. Silver nitrate is added dropwise to distilled water in which the precipitate has been washed, and after confirming that there is no reaction of chlorine ions, distilled water is added to the washed precipitate to make a total volume of 2000 ml. To this, 40 ml of 30% aqueous ammonia was added and heated to obtain a uniform sol. Further, while adding aqueous ammonia, the solution was concentrated by heating until the solid content concentration of SnO 2 reached 8.3% by mass to obtain SnO 2 sol (A).
- Solution-I Surfactant: 10% by mass methanol solution of polyisopropylene polyethylene oxydisuccinate sodium salt (Solution-II) 10 mass% aqueous solution of rhodium hexachloride complex (Solution-F) Alkali-treated inert gelatin (average molecular weight 100,000) 16.5g Pure water 139.8 ml.
- a hardening agent tetrakis (vinylsulfonylmethyl) methane
- a surfactant di (2-ethylhexyl) sulfosuccinate / sodium
- the amount of gelatin was adjusted so that the volume ratio of silver to gelatin was 0.5.
- the volume ratio of silver and gelatin as used herein refers to a value obtained by dividing the volume of silver halide fine particles applied by the volume of gelatin applied.
- the photosensitive material 101 produced as described above was exposed using an ultraviolet lamp through a lattice-like photomask having a line width of 13 ⁇ m and an interval between lines of 500 ⁇ m.
- fixing processing is performed for 60 seconds at 35 ° C. using the following fixing solution (FIX-1). Washing with water was performed. Further, physical development was performed at 30 ° C. for 5 minutes using the following physical developer (PD-1), followed by washing with water.
- PD-1 physical developer
- FIX-1 Fixer 750 ml of pure water Sodium thiosulfate 250g Anhydrous sodium sulfite 15g Glacial acetic acid 15ml Potash alum 15g Add water to bring the total volume to 1L.
- an aqueous dispersion of conductive polyaniline containing a sulfonic acid dopant [ORMECON D1033W (manufactured by Olmecon, Germany)] is formed in the opening of the metal current collecting layer so that the dry film thickness on the silver thin wire is 100 nm. And it apply
- a conductive substrate CB-02 was prepared in the same manner as the conductive substrate CB-01 except that the step of forming the transparent conductive layer was omitted in the preparation of the conductive substrate CB-01.
- the conductive substrate CB- was prepared except that exposure was performed using an ultraviolet lamp through a grid-like photomask having a line width of 7 ⁇ m in the formation process of the metal current collecting layer.
- a conductive substrate CB-05 was prepared in the same manner as in 01.
- PET polyethylene terephthalate
- the semiconductor electrode and the counter electrode are bonded to each other using a 25 ⁇ m thick sheet-like spacer / sealing material (SX-1170-25 made by Solaronix) with a 6.5 mm square hole, and provided on the cathode electrode.
- a 25 ⁇ m thick sheet-like spacer / sealing material SX-1170-25 made by Solaronix
- a 6.5 mm square hole the cathode electrode.
- lithium iodide, iodine, 1,2-dimethyl-3-propylimidazolium iodide, and t-butylpyridine using acetonitrile as a solvent were each at a concentration of 0.1 mol / L, 0.
- a charge transfer layer containing a redox electrolyte dissolved so as to be 05 mol / L, 0.6 mol / L, and 0.5 mol / L is injected, the hole is closed with a hot bond, and the sealing agent is added from above. And sealed.
- An antireflection film Konica Minolta Op hard coat / antireflection type cellulose film was bonded to the light receiving surface side of the base material having the metal oxide semiconductor layer to prepare a dye-sensitized solar cell SC-01.
- ⁇ Preparation of dye-sensitized solar cell SC-02 >> ⁇ Formation of metal oxide intermediate layer> Using the apparatus described in Japanese Patent Application Laid-Open No. 2004-256920, a metal oxide intermediate layer made of titanium oxide having a size of 4 mm ⁇ 4 mm square is formed on the conductive substrate CB-02 by an aerosol deposition method. did. The film thickness was 172 ⁇ m and the porosity was 16%.
- the photoelectric conversion efficiency is improved and the durability is further improved particularly by increasing the short-circuit current.
- significant improvements were confirmed by optimally controlling the thickness and porosity of the metal oxide intermediate layer.
- the dye-sensitized solar cell of the present invention has excellent photoelectric conversion efficiency even when fired at a low temperature, and is clearly excellent in suitability when using a resin film substrate. It is.
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Abstract
Description
11 金属集電層
20 金属酸化物半導体層
30 電荷移動層
40 導電性層(対向電極)
50 基材
50a 透明基材
60 金属酸化物中間層
最初に、本発明の色素増感型太陽電池について、図1を用いて説明する。図1は、本発明の色素増感型太陽電池の基本構造を示す概略断面図である。本発明の色素増感型太陽電池は図1によって示される通り、導電性基材として透明基材50a上に金属集電層11及び透明導電性層10を有し、その上に金属酸化物中間層60、表面に色素を吸着させた半導体膜から構成される金属酸化物半導体層20、電荷移動層(「電解質層」と呼ぶこともある)30を順次有し、更に対向電極として、基材50の表面に導電性層40を有する構成である。
本発明の色素増感型太陽電池は、導電性基材と金属酸化物半導体層の間に金属酸化物微粒子から構成される金属酸化物中間層を有している。
本発明の色素増感型太陽電池では、導電性基材として、透明基材上に金属細線からなる金属集電層、及び導電性ポリマーを含有する透明導電性層を有している。
金属細線からなる金属集電層の形状に特に限定はなく、網目状、ストライプ状、または任意のパターンにより形成することが可能である。金属細線の材質に特に限定はなく、金、銀、銅、白金、アルミニウム、ニッケル、タングステンなどの金属、またはこれらを複数種類含有する合金など、任意に選択して使用することが可能である。特に導電性の観点から、または細線の製法によっては、特に銀を用いることも好ましい態様の1つである。
次に、本発明に係る透明基材上に設けられる透明導電性層について説明する。
本発明の色素増感型太陽電池で用いられる導電性基材に使用される透明基材としては、ガラス板や樹脂フィルムを使用することができる。
本発明に係る金属酸化物半導体層について説明する。
本発明に用いられる色素について説明する。
電荷移動層は、色素の酸化体に電子を補充する機能を有する電荷輸送材料を含有する層である。本発明で用いることのできる代表的な電荷輸送材料の例としては、酸化還元対イオンが溶解した溶剤や酸化還元対イオンを含有する常温溶融塩等の電解液、酸化還元対イオンの溶液をポリマーマトリクスや低分子ゲル化剤等に含浸したゲル状の擬固体化電解質、更には高分子固体電解質等が挙げられる。また、イオンが関わる電荷輸送材料の他に、固体中のキャリア移動が電気伝導に関わる材料として、電子輸送材料や正孔(ホール)輸送材料を挙げることもでき、これらは併用してすることも可能である。
本発明で使用できる対向電極は、前述した導電性基材と同様にそれ自体が導電性を有する基材の単層構造、またはその表面に導電性層を有する基材を利用することができる。後者の場合、導電性層に用いる導電性材料、基材、更にその製造方法としては、前述した導電性基材の場合と同様で、公知の種々の材料及び方法を適用することができる。
〔導電性基材の作製〕
《導電性基材CB-01の作製》
〈下引層形成〉
200μm厚の二軸延伸PET支持体の片面に12W・min/m2のコロナ放電処理を施し、下引塗布液B-1を乾燥膜厚0.1μmになるように塗布し、その上に12W・min/m2のコロナ放電処理を施し、下引塗布液B-2を乾燥膜厚0.06μmになるように塗布した。その後、120℃で1.5分の熱処理を実施し、下引済みPETフィルム支持体を得た。
スチレン20質量部、グリシジルメタクリレート40質量部、ブチルアクリレート40質量部の共重合体ラテックス液(固形分質量30%) 50g
SnO2ゾル(A) 440g
化合物(UL-1) 0.2g
水で仕上げる 1000ml
(下引塗布液B-2)
ゼラチン 10g
化合物(UL-1) 0.2g
化合物(UL-2) 0.2g
シリカ粒子(平均粒径3μm) 0.1g
硬膜剤(UL-3) 1g
水で仕上げる 1000ml。
65gのSnCl4・5H2Oを蒸留水2000mlに溶解して均一溶液とし、次いでこれを煮沸し、沈澱物を得た。生成した沈澱物をデカンテーションにより取り出し、蒸留水にて何度も水洗する。沈澱を水洗した蒸留水中に硝酸銀を滴下し、塩素イオンの反応がないことを確認後、洗浄した沈澱物に蒸留水を添加し全量を2000mlとする。これに30%アンモニア水40mlを加え加温することにより、均一なゾルを得た。更にアンモニア水を添加しながら、SnO2の固形分濃度が8.3質量%になるまで加熱濃縮し、SnO2ゾル(A)を得た。
反応容器内で下記溶液-Aを34℃に保ち、特開昭62-160128号公報記載の混合撹拌装置を用いて高速に撹拌しながら、硝酸(濃度6%)を用いてpHを2.95に調整した。引き続き、ダブルジェット法を用いて下記(溶液-B)と下記(溶液-C)を一定の流量で8分6秒間かけて添加した。添加終了後に、炭酸ナトリウム(濃度5%)を用いてpHを5.90に調整し、続いて下記(溶液-D)と(溶液-E)を添加した。
アルカリ処理不活性ゼラチン(平均分子量10万) 18.7g
塩化ナトリウム 0.31g
下記(溶液-I) 1.59ml
純水 1246ml
(溶液-B)
硝酸銀 169.9g
硝酸(濃度6%) 5.89ml
純水にて317.1mlに仕上げる。
アルカリ処理不活性ゼラチン(平均分子量10万) 5.66g
塩化ナトリウム 58.8g
臭化カリウム 13.3g
下記(溶液-I) 0.85ml
下記(溶液-II) 2.72ml
純水にて317.1mlに仕上げる。
2-メチル-4ヒドロキシ-1,3,3a,7-テトラアザインデン 0.56g
純水 112.1ml。
アルカリ処理不活性ゼラチン(平均分子量10万) 3.96g
下記(溶液-I) 0.40ml
純水 128.5ml。
界面活性剤:ポリイソプロピレンポリエチレンオキシジコハク酸エステルナトリウム塩の10質量%メタノール溶液
(溶液-II)
六塩化ロジウム錯体の10質量%水溶液
(溶液-F)
アルカリ処理不活性ゼラチン(平均分子量10万) 16.5g
純水 139.8ml。
上述のように下引層を施した支持体上に、前述のように調製したハロゲン化銀微粒子乳剤EMP-1を塗布銀量が銀換算で0.8g/m2となるように塗布を行った後、乾燥して、感光材料101を作製した。
上述のようにして製造した感光材料101に対して、ライン幅が13μm、ライン同士の間隔が500μmの格子状のフォトマスクを介して、紫外線ランプを用いて露光を行った。次いで、下記現像液(DEV-1)を用いて35℃で30秒間現像処理を行った後、下記定着液(FIX-1)を用いて35℃で60秒間の定着処理を行い、それに続けて水洗処理を行った。更に下記物理現像液(PD-1)を用いて、30℃5分間の物理現像を行い、次いで水洗処理を行った。
純水 500ml
メトール 2g
無水亜硫酸ナトリウム 80g
ハイドロキノン 4g
ホウ砂 4g
チオ硫酸ナトリウム 10g
臭化カリウム 0.5g
水を加えて全量を1Lとする。
純水 750ml
チオ硫酸ナトリウム 250g
無水亜硫酸ナトリウム 15g
氷酢酸 15ml
カリミョウバン 15g
水を加えて全量を1Lとする。
純水 800ml
クエン酸 31g
ハイドロキノン 7.8g
リン酸水素二ナトリウム 1.1g
アンモニア水(28%) 2.2ml
硝酸銀 1.5g
水を加えて全量を1Lとする。
導電性ポリマーとして、スルホン酸系ドーパントを含有する導電性ポリアニリンの水系分散液〔ORMECON D1033W(ドイツ オルメコン製)〕を銀細線上の乾燥膜厚が100nmとなるように、金属集電層の開口部及び金属細線上に平滑に塗布し、続いて100℃で20分間の加熱処理を施し、導電性基材CB-01を作製した。
導電性基材CB-01の作製において、透明導電性層の形成工程を省いた以外は導電性基材CB-01と同様に作製し、導電性基材CB-02を作製した。
導電性ポリアニリンの水系分散液〔ORMECON D1033W(ドイツ オルメコン製)〕を、乾燥膜厚が100nmとなるように上記下引済みPETフィルム支持体上に塗布し、続いて100℃で20分間の加熱処理を施し、導電性基材CB-03を作製した。
導電性基材CB-01の作製において、透明導電性層として導電性ポリアニリン水系分散液の代わりにインジウムドープ酸化錫の水系分散液を使用して、透明導電性層を形成した以外は導電性基材CB-01と同様に作製し、導電性基材CB-04を作製した。
導電性基材CB-01の作製において、金属集電層の形成工程でライン幅が7μmの格子状のフォトマスクを介して、紫外線ランプを用いて露光を行った以外は導電性基材CB-01と同様に作製し、導電性基材CB-05を作製した。
《色素増感型太陽電池SC-01の作製》
TiO2ペースト(Solaronix製Ti-NanoxideT)をドライ膜厚10μmとなるように数回塗布、乾燥し、導電性基材CB-01上に4mm×4mm角の大きさに塗布した後、プレス成型機により130℃、9.8×108Paの条件で1分圧着して、多孔性の金属酸化物半導体層を形成した。
〈金属酸化物中間層の形成〉
特開2004-256920号公報に記載の装置を使用して、エアロゾルデポジション法によって、導電性基材CB-02上に4mm×4mm角の大きさの酸化チタンからなる金属酸化物中間層を形成した。膜厚は172μm、空隙率は16%であった。
色素増感型太陽電池SC-01の作製において、金属酸化物半導体層形成用の酸化チタンペーストを、導電性基材上ではなく上記金属酸化物中間層上に塗布する以外は色素増感型太陽電池SC-01の作製と同様に作製し、色素増感型太陽電池SC-02を作製した。
色素増感型太陽電池SC-02の作製において、使用する導電性基材、及び金属酸化物中間層の膜厚、空隙率を表1に記載の通りに変更する以外は色素増感型太陽電池SC-02の作製と同様に作製し、色素増感型太陽電池SC-03~11を作製した。なお、金属酸化物中間層の空隙率については、ガスボンベのガス圧と排気ポンプの排気量を調整することによって制御した。
色素増感型太陽電池SC-11の作製において、金属酸化物中間層の組成を酸化チタンから酸化ニオブ(平均粒子径;92nm)に変更した以外は色素増感型太陽電池SC-11の作製と同様に作製し、色素増感型太陽電池SC-12を作製した。
上記で得られた太陽電池SC-01~12の各々にソーラーシミュレーター(JASCO(日本分光)製、低エネルギー分光感度測定装置CEP-25)により100mW/m2の強度の光を照射した時の短絡電流密度Jsc(mA/cm2)、開放電圧値Voc(V)、フィルファクターff、変換効率η(%)を求めて表1に示した。示した値は、同じ構成及び作製方法の太陽電池3つずつ作製して評価した測定結果の平均値とした。
上記で得られた太陽電池SC-01~12の各々に、JIS規格C8938の温湿度サイクル試験A-2に対応する温湿度変化(-40℃~90℃、相対湿度85%)を5サイクル実施し、その前後で上述の測定方法により光電変換効率η(%)を求めた。温湿度サイクル実施前の光電変換効率に対する温湿度サイクル実施後の光電変換効率をそれぞれの太陽電池について算出し、表1に示した。示した値は、同じ構成及び作製方法の太陽電池3つずつ作製して評価した測定結果の平均値とした。
Claims (5)
- 導電性基材上に色素が表面に吸着された半導体膜から構成される金属酸化物半導体層と電荷移動層と対向電極とを順次有する色素増感型太陽電池であって、該導電性基材と該金属酸化物半導体層の間に金属酸化物微粒子から構成される金属酸化物中間層を有し、更に該導電性基材は透明基材上に金属細線からなる金属集電層及び導電性ポリマーを含有する透明導電性層を有することを特徴とする色素増感型太陽電池。
- 前記金属集電層を構成する金属細線の線幅が5μm以上20μm以下であり、前記金属集電層の開口率が93%以上98%以下であることを特徴とする請求の範囲第1項に記載の色素増感型太陽電池。
- 前記透明導電性層が金属集電層の開口部及び金属細線の上部を覆い、前記導電性基材の最上面が平滑であることを特徴とする請求の範囲第1項または第2項に記載の色素増感型太陽電池。
- 前記金属酸化物中間層の膜厚が5nm以上200nm以下であることを特徴とする請求の範囲第1項~第3項のいずれか1項に記載の色素増感型太陽電池。
- 前記金属酸化物中間層の空隙率が10%以下であることを特徴とする請求の範囲第1項~第4項のいずれか1項に記載の色素増感型太陽電池。
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