WO2012017871A1 - 金属錯体色素、光電変換素子及び光電気化学電池 - Google Patents
金属錯体色素、光電変換素子及び光電気化学電池 Download PDFInfo
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- WO2012017871A1 WO2012017871A1 PCT/JP2011/067008 JP2011067008W WO2012017871A1 WO 2012017871 A1 WO2012017871 A1 WO 2012017871A1 JP 2011067008 W JP2011067008 W JP 2011067008W WO 2012017871 A1 WO2012017871 A1 WO 2012017871A1
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- general formula
- dye
- atom
- metal complex
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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
- H01G9/2059—Light-sensitive devices comprising an organic dye as the active light absorbing material, e.g. adsorbed on an electrode or dissolved in solution
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F1/00—Compounds containing elements of Groups 1 or 11 of the Periodic Table
- C07F1/005—Compounds containing elements of Groups 1 or 11 of the Periodic Table without C-Metal linkages
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F15/00—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table
- C07F15/0006—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table compounds of the platinum group
- C07F15/0013—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table compounds of the platinum group without a metal-carbon linkage
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F3/00—Compounds containing elements of Groups 2 or 12 of the Periodic Table
- C07F3/003—Compounds containing elements of Groups 2 or 12 of the Periodic Table without C-Metal linkages
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
- C07F5/003—Compounds containing elements of Groups 3 or 13 of the Periodic Table without C-Metal linkages
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
- C07F7/003—Compounds containing elements of Groups 4 or 14 of the Periodic Table without C-Metal linkages
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
- C07F9/005—Compounds of elements of Group 5 of the Periodic Table without metal-carbon linkages
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B47/00—Porphines; Azaporphines
- C09B47/04—Phthalocyanines abbreviation: Pc
- C09B47/06—Preparation from carboxylic acids or derivatives thereof, e.g. anhydrides, amides, mononitriles, phthalimide, o-cyanobenzamide
- C09B47/067—Preparation from carboxylic acids or derivatives thereof, e.g. anhydrides, amides, mononitriles, phthalimide, o-cyanobenzamide from phthalodinitriles naphthalenedinitriles, aromatic dinitriles prepared in situ, hydrogenated phthalodinitrile
- C09B47/0673—Preparation from carboxylic acids or derivatives thereof, e.g. anhydrides, amides, mononitriles, phthalimide, o-cyanobenzamide from phthalodinitriles naphthalenedinitriles, aromatic dinitriles prepared in situ, hydrogenated phthalodinitrile having alkyl radicals linked directly to the Pc skeleton; having carbocyclic groups linked directly to the skeleton
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B47/00—Porphines; Azaporphines
- C09B47/04—Phthalocyanines abbreviation: Pc
- C09B47/06—Preparation from carboxylic acids or derivatives thereof, e.g. anhydrides, amides, mononitriles, phthalimide, o-cyanobenzamide
- C09B47/067—Preparation from carboxylic acids or derivatives thereof, e.g. anhydrides, amides, mononitriles, phthalimide, o-cyanobenzamide from phthalodinitriles naphthalenedinitriles, aromatic dinitriles prepared in situ, hydrogenated phthalodinitrile
- C09B47/0678—Preparation from carboxylic acids or derivatives thereof, e.g. anhydrides, amides, mononitriles, phthalimide, o-cyanobenzamide from phthalodinitriles naphthalenedinitriles, aromatic dinitriles prepared in situ, hydrogenated phthalodinitrile having-COOH or -SO3H radicals or derivatives thereof directly linked to the skeleton
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/30—Coordination compounds
- H10K85/311—Phthalocyanine
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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
- H01G9/2004—Light-sensitive devices characterised by the electrolyte, e.g. comprising an organic electrolyte
- H01G9/2013—Light-sensitive devices characterised by the electrolyte, e.g. comprising an organic electrolyte the electrolyte comprising ionic liquids, e.g. alkyl imidazolium iodide
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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
- H01G9/2027—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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- 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 metal complex dye, a photoelectric conversion element, and a photoelectrochemical cell that have high conversion efficiency and excellent durability.
- Photoelectric conversion elements are used in various optical sensors, copiers, solar cells and the like.
- Various types of photoelectric conversion elements have been put to practical use, such as those using metals, semiconductors, organic pigments and dyes, or combinations thereof.
- a solar cell using non-depleting solar energy does not require fuel, and its full-scale practical use is expected greatly as it uses inexhaustible clean energy.
- silicon solar cells have been researched and developed for a long time. It is spreading due to the policy considerations of each country. However, silicon is an inorganic material, and its throughput and molecular modification are naturally limited.
- Patent Document 1 describes a dye-sensitized photoelectric conversion element using semiconductor fine particles sensitized with a ruthenium complex dye by applying this technique.
- the photoelectric conversion element is required to have high initial conversion efficiency and excellent durability with little decrease in conversion efficiency after use. However, in terms of durability, the photoelectric conversion element described in Patent Document 2 is still not sufficient.
- An object of the present invention is to provide a metal complex dye having high conversion efficiency and excellent durability, and a photoelectric conversion element and a photoelectrochemical cell using the same.
- the present inventors have obtained a porous semiconductor in which a metal complex dye having a specific binuclear structure and a specific number of acidic groups in the molecule is formed on a conductive support.
- a photoelectric conversion element and a photoelectrochemical cell that have high conversion efficiency and excellent durability because they are not easily attacked by water or a nucleophilic species that decomposes the dye, which is oriented and adsorbed on the fine particles, and causes the dye to be peeled off. I found that I can do it.
- the present invention has been made based on this finding.
- a metal complex dye having a structure defined by the following general formula (1) and having one or two acidic groups.
- a and C have the structure of General Formula (2), and A and C may be the same as or different from each other.
- B represents a linking group, and n represents an integer of 1 or more.
- the bond between A and B and the bond between B and C may each be divalent or higher.
- a double bond may be included so as to maintain the resonance structure of the compound.
- R 1 to R 8 each independently represents a hydrogen atom, a substituent, or a bond to B in the general formula (1). However, R 1 to R 8 and other sites may be bonded in such a manner that they are incorporated into B. Of R 1 to R 8 , those bonded to the same pyrrole ring may be bonded directly or via other groups to have a cyclic structure.
- X represents a carbon atom or a nitrogen atom.
- M represents two hydrogen atoms, two metal atoms, one metal atom, or a metal oxide.
- ⁇ 3> The metal complex dye according to ⁇ 1> or ⁇ 2>, wherein the acidic group has in either A or C in the general formula (1).
- ⁇ 4> The metal complex dye according to any one of ⁇ 1> to ⁇ 3>, wherein at least one of A and C in the general formula (1) is represented by the following general formula (3) or (4).
- R 8 to R 47 each independently represent a hydrogen atom, a substituent, or a bond to B in General Formula (1). At this time, the bond may include a double bond so as to maintain the resonance structure. However, R 8 to R 47 and other sites may be bonded in such a manner that they are incorporated into B. R 8 to R 47 may be bonded directly or via another group to have a cyclic structure. M represents two hydrogen atoms or one metal atom or metal oxide. ] ⁇ 5> The metal complex dye according to any one of ⁇ 1> to ⁇ 4>, wherein B in the general formula (1) has a structure of the following general formulas (5) to (8).
- R 47 to R 51 represent a hydrogen atom or a substituent.
- a1 to a4 each represents an integer of 1 or more.
- D represents a sulfur atom, an oxygen atom or NR (R is an alkyl group).
- * represents a bond with A or C. At this time, the bond may include a double bond so as to maintain the resonance structure.
- R 51 and R 52 to R 81 each independently represent a hydrogen atom or a substituent, and R 52 to R 81 are bonded to a carbon atom adjacent to the same benzene ring. These may have a cyclic structure directly or via another atom or group. R 67 to R 81 have at least one acidic group. M 1 and M 2 represent two hydrogen atoms or one metal atom.
- B has the same meaning as in the general formula (1).
- ⁇ 7> The metal complex dye according to any one of ⁇ 1> to ⁇ 5>, wherein the general formula (1) has a structure represented by the following general formula (11).
- R 49 , R 50 , R 52 to R 81 each independently represents a hydrogen atom or a substituent, and R 52 to R 81 are bonded to the adjacent carbon atom of the same benzene ring. Things may have a cyclic structure directly or through another atom or group. R 52 to R 81 have at least one acidic group. M 1 and M 2 represent two hydrogen atoms or one metal atom. ] ⁇ 8> In the general formulas (9) to (11), one or two groups selected from R 67 , R 68 , R 71 , R 72 , R 75 and R 76 are an acidic group or an acidic group.
- the metal complex dye according to ⁇ 6> or ⁇ 7>, which is a group having ⁇ 9> The metal complex dye according to any one of ⁇ 1> to ⁇ 8>, wherein the structure having an acidic group further has an electron withdrawing group on an atom to which the acidic group is bonded.
- a photoelectric conversion device comprising a photoreceptor layer having a metal complex dye having the structure according to any one of ⁇ 1> to ⁇ 11> and semiconductor fine particles.
- the dye further contains another dye in the metal complex dye described in any one of ⁇ 1> to ⁇ 11>.
- ⁇ 14> The photoelectric conversion element according to ⁇ 13>, wherein the other dye has a structure represented by the following general formula (13).
- Mz represents a metal atom
- LL 1 is a bidentate or tridentate ligand represented by the following general formula (14)
- LL 2 is represented by the following general formula (15). The bidentate or tridentate ligand represented.
- X is an acyloxy group, an acylthio group, a thioacyloxy group, a thioacylthio group, an acylaminooxy group, a thiocarbamate group, a dithiocarbamate group, a thiocarbonate group, a dithiocarbonate group, a trithiocarbonate group, an acyl group, a thiocyanate group,
- a monodentate or bidentate ligand coordinated by a group selected from the group consisting of an isothiocyanate group, a cyanate group, an isocyanate group, a cyano group, an alkylthio group, an arylthio group, an alkoxy group and an aryloxy group, or a halogen atom Represents a monodentate or bidentate ligand consisting of carbonyl, dialkyl ketone, 1,3-diketone, carbonamide, thiocarbonamide or thiourea.
- n1 represents an integer of 0 to 3, and when m1 is 2 or more, LL 1 may be the same or different.
- m2 represents an integer of 0 to 3, and when m2 is 2, LL 2 may be the same or different. However, at least one of m1 and m2 is an integer of 1 or more.
- M3 represents an integer of 0 to 2, and when m3 is 2, Xs may be the same or different, and Xs may be linked together.
- CI represents a counter ion in the general formula (13) when a counter ion is necessary to neutralize the charge.
- R 101 and R 102 each independently represent a carboxyl group, a sulfonic acid group, a hydroxyl group, a hydroxamic acid group, a phosphoryl group, or a phosphonyl group.
- R 103 and R 104 each independently represent a substituent, and R 105 and R 106 each independently represent an alkyl group, an aryl group, or a heterocyclic group.
- d1 and d2 each represents an integer of 0 or more.
- L 1 and L 2 each independently represent a conjugated chain containing at least one selected from an ethenylene group, an ethynylene group, an arylene group, and a heteroarylene group.
- L 1 and L 2 are each independently conjugated with the pyridine ring to which they are bonded.
- a1 and a2 each independently represent an integer of 0 to 3, and when a1 is 2 or more, R 101 may be the same or different, and when a2 is 2 or more, R 102 may be the same or different, b1 And b2 each independently represents an integer of 0 to 3.
- R 103 may be the same or different, R 103 may be linked to each other to form a ring, and when b2 is 2 or more, R 104 may be the same or different.
- 104 may be connected to each other to form a ring.
- b1 and b2 are both 1 or more, may be linked to form a ring R 103 and R 104 are.
- d3 represents 0 or 1.
- Za, Zb and Zc each independently represent a non-metallic atom group capable of forming a 5- or 6-membered ring, and may each independently have an acidic group.
- c represents 0 or 1;
- a photoelectrochemical cell comprising the photoelectric conversion element according to any one of ⁇ 12> to ⁇ 14>.
- the metal complex dye of the present invention When the metal complex dye of the present invention is used, a photoelectric conversion element and a photoelectrochemical cell having high conversion efficiency and excellent durability can be provided.
- the metal complex dye of the present invention has a specific binuclear structure (porphyrin, phthalocyanine, naphthalocyanine and other structures represented by the general formula (2) as one unit. And having two or more in the same molecule), it has a wide absorption range, a high ⁇ , and high conversion efficiency can be obtained when used in a photoelectric conversion element or a photoelectrochemical cell. .
- the metal complex dye of the present invention since the metal complex dye of the present invention has a binuclear structure and a specific number of acidic groups in the molecule, it is closely aligned and adsorbed on the porous semiconductor fine particles formed on the conductive support.
- the present inventors have found that a photoelectric conversion element or a photoelectrochemical cell having high conversion efficiency can be obtained in order to improve electron injection efficiency and suppress reverse electron transfer. Furthermore, the semiconductor fine particle layer to which the metal complex dye of the present invention is adsorbed is not easily attacked by water or nucleophilic species that decompose the dye, which causes the dye to peel off, and has excellent durability. It has been found that a battery can be provided. The present invention has been made based on these findings.
- the photoelectric conversion element 10 includes a conductive support 1, a photosensitive layer 2, a charge transfer layer 3, and a counter electrode 4 arranged in that order on the conductive support 1.
- the conductive support 1 and the photoreceptor 2 constitute a light receiving electrode 5.
- the photoreceptor 2 has conductive fine particles 22 and a sensitizing dye 21, and the dye 21 is adsorbed on the conductive fine particles 22 at least in part (the dye is in an adsorption equilibrium state, It may be present in the partial charge transfer layer.)
- the conductive support 1 on which the photoreceptor 2 is formed functions as a working electrode in the photoelectric conversion element 10.
- the photoelectric conversion element 10 can be operated as the photoelectrochemical cell 100 by causing the external circuit 6 to work.
- the upper and lower sides of the photoelectric conversion element do not need to be defined in particular, but in this specification, based on what is illustrated, the side of the counter electrode 4 serving as the light receiving side is the upper (top) direction, and the support The side of 1 is the lower (bottom) direction.
- the light-receiving electrode 5 is an electrode composed of a conductive support 1 and a photosensitive layer (semiconductor film) 2 of semiconductor fine particles 22 adsorbed with a dye 21 coated on the conductive support.
- the light incident on the photoreceptor (semiconductor film) 2 excites the dye.
- the excited dye has high energy electrons. Therefore, the electrons are transferred from the dye 21 to the conduction band of the semiconductor fine particles 22 and further reach the conductive support 1 by diffusion.
- the molecule of the dye 21 is an oxidant.
- the electrons on the electrode return to the oxidized dye while working in an external circuit, thereby acting as a photoelectrochemical cell.
- the light receiving electrode 5 functions as a negative electrode of the battery.
- the photoelectric conversion element of the present embodiment has a photoreceptor having a layer of porous semiconductor fine particles in which a composite sensitizing dye described later is adsorbed on a conductive support. At this time, as described above, a part of the dye may be dissociated in the electrolyte.
- the photoreceptor is designed according to the purpose, and may have a single layer structure or a multilayer structure.
- the photoconductor of the photoelectric conversion element of the present embodiment contains semiconductor fine particles adsorbed with a specific metal complex dye, has high sensitivity, and can be used as a photoelectrochemical cell, and can obtain high conversion efficiency. High durability.
- (A) Dye (A1) Binuclear metal complex dye having the structure of the general formula (1)
- the dye (dye compound) adsorbed on the porous semiconductor fine particles constituting the photoconductor has the structure of the following general formula (1): That is, it is a metal complex dye having double nuclei (A and C) and one or two acidic groups.
- the acidic group itself such as a carboxy group, the acidic group may be substituted via a linking group within a range that exhibits a desired effect, and this linking group is referred to as an acidic group.
- a and C have the structure of the general formula (2), and A and C may be the same as or different from each other.
- B represents a linking group, and n represents an integer of 1 or more. n is preferably an integer of 1 to 2.
- the bond between A and B and the bond between B and C may each be divalent or higher. In addition, a double bond may be included so as to maintain the resonance structure of the compound.
- the linking group for B is not particularly limited, but preferably has a structure represented by the following general formulas (5) to (8).
- R 47 to R 51 represent a hydrogen atom or a substituent.
- a1 to a4 each represents an integer of 1 or more.
- D represents a sulfur atom, an oxygen atom or NR (R is an alkyl group).
- * represents a bond with A or C. At this time, the bond may include a double bond so as to maintain the resonance structure.
- particularly preferred linking groups for B are the general formulas (6), (7), and (8). When the linking group B has these structures, it is conjugated with each other (A and C in the general formula (1)), and an effect of expanding the absorption region is obtained, thereby improving the conversion efficiency.
- the semiconductor fine particles (from A or C on the side that does not have an adsorbing group as compared with the case of being connected non-conjugatedly (for example, electron injection into titanium oxide fine particles) is performed efficiently.
- a chemical formula such as a valence of a bond may be interpreted so as to match a resonance structure, unless otherwise specified.
- R 1 to R 8 each independently represents a hydrogen atom, a substituent, or a bond to B in the general formula (1).
- the bond may include a double bond so as to maintain the resonance structure.
- R 1 to R 8 and other sites may be bonded in such a manner that they are incorporated into B.
- substituents examples include an alkyl group or an alkenyl group (for example, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, t-butyl, pentyl, isopentyl, 2-methylbutyl, 1-methylbutyl, hexyl, isohexyl, sec-hexyl, t-hexyl, cyclopropyl, cyclobutyl, cyclopentyl, n-dodecyl, cyclohexyl, vinyl, allyl, benzyl, etc.), aryl groups (eg, phenyl, tolyl, xylyl, biphenyl, naphthyl, etc.), heterocyclic residues ( For example, pyridyl, imidazolyl, furyl, thienyl, pyronyl, oxazolyl, thiazolyl,
- substituents may be further present on the carbon atom of the substituent.
- an alkyl group, an alkenyl group, an aryl group, and a heterocyclic group are particularly preferable.
- those bonded to the same pyrrole ring may be bonded directly or via other groups to have a cyclic structure.
- This cyclic structure includes furan, pyrrole, imidazole, thiophene, phosphole, pyrazole, oxazole, isoxazole, thiazole, benzene, pyridine, pyrazine, pyrimidine, pyridazine, benzofuran, isobenzofuran, indole, isoindole, benzothiophene, benzophos Hole, benzimidazole, indazole, benzoxazole, benzoisoxazole, benzothiazole, naphthalene, quinoline, isoquinoline, quinoxaline, quinazoline, cinnoline.
- R 1 to R 8 are preferably alkyl groups.
- X represents a carbon atom or a nitrogen atom.
- M represents two hydrogen atoms, two metal atoms, or one metal atom.
- metal atoms include those in an oxide state.
- Preferred metal atoms are Ti, V, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn, Hf. , Ta, W, Re, Os, Ir, Pt, Au, Hg, and Pb. More preferred are Zn, Ru, V, Sn, In, Pb, and Os.
- the metal complex dye having the structure of the above general formula (1) and A and C in the general formula (1) having the structure of the general formula (2) has a wide absorption range, a high ⁇ , and a photoelectric conversion element. And high conversion efficiency can be obtained when used in photoelectrochemical cells.
- a metal complex dye having one or two acidic groups in the molecule causes the dye to be peeled off by being closely adsorbed to the porous semiconductor fine particles formed on the conductive support at the acidic group portion. Therefore, the photoelectric conversion element and the photoelectrochemical cell having high conversion efficiency and excellent durability can be provided.
- Examples of the acidic group in the general formula (1) include a carboxyl group, a sulfonic acid group, a hydroxyl group, a hydroxamic acid group, a phosphoryl group, and a phosphonyl group, and a carboxyl group is preferable.
- the acidic group has an action of adsorbing to semiconductor fine particles (for example, titanium oxide). It is preferable to have an acidic group in either A or C in the general formula (1).
- R 1 to R 8 may have an acidic group.
- At least one of A and C in the general formula (1) is represented by the following general formula (3) or (4).
- R 8 to R 47 each independently represent a hydrogen atom, a substituent, or a bond to B in the general formula (1).
- the bond may include a double bond so as to maintain the resonance structure.
- R 8 to R 47 and other sites may be bonded in such a manner that they are incorporated into B.
- substituents examples include an alkyl group or an alkenyl group (for example, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, t-butyl, pentyl, isopentyl, 2-methylbutyl, 1-methylbutyl, hexyl, isohexyl, sec-hexyl, t-hexyl, cyclopropyl, cyclobutyl, cyclopentyl, n-dodecyl, cyclohexyl, vinyl, allyl, benzyl, etc.), aryl groups (eg, phenyl, tolyl, xylyl, biphenyl, naphthyl, etc.), heterocyclic residues ( For example, pyridyl, imidazolyl, furyl, thienyl, pyronyl, oxazolyl, thiazolyl,
- R 8 to R 47 may be bonded directly or via another group to have a cyclic structure.
- Cyclic structures include furan, pyrrole, imidazole, thiophene, phosphole, pyrazole, oxazole, isoxazole, thiazole, benzene, pyridine, pyrazine, pyrimidine, pyridazine, benzofuran, isobenzofuran, indole, isoindole, benzothiophene, benzophosphole Benzimidazole, indazole, benzoxazole, benzoisoxazole, benzothiazole, naphthalene, quinoline, isoquinoline, quinoxaline, quinazoline, cinnoline, and benzene and naphthalene are particularly preferable.
- Preferable substituents include those represented by the following general formula (A). -(X) n -R a General formula (A)
- X represents a NR b
- R b represents a hydrogen atom or an aliphatic group.
- R a represents an aliphatic group, an aromatic group, or a heterocyclic group.
- the aromatic group represented by Ra include benzene, naphthalene, anthracene, and phenanthrene.
- the heterocyclic group include anthraquinone, carbazole, pyridine, quinoline, thiophene, furan, xanthene, and thianthrene.
- a preferred example of R a is a heterocyclic group.
- metal atoms include those in an oxide state.
- Preferred metal atoms are Ti, V, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn, Hf. , Ta, W, Re, Os, Ir, Pt, Au, Hg, TI, Pb. More preferred are Zn, Ru, V, Sn, In, Pb, and Os. Examples of the oxide state include VO and TiO.
- the metal complex dye in which at least one of the general formula (1) is represented by the general formula (3) or (4) can expand the absorption wavelength region and can exhibit the effect of improving durability.
- the general formula (1) has a structure represented by the following general formula (9) or (10). Since the metal complex dye having the structure of the general formula (9) or (10) has a binuclear phthalocyanine structure, it can absorb long-wavelength light and can improve the conversion efficiency. In addition, the metal complex dye having the structure of the general formula (9) or (10) is excellent in solubility in an organic solvent and can be efficiently adsorbed on the porous semiconductor fine particles. In addition, since these dyes have a linear structure as a whole, they can not only absorb long-wavelength light, but also easily become oriented and adsorbed on the porous semiconductor fine particles. For this reason, when these dyes are used, a photoelectric conversion element and a photoelectrochemical cell that are not easily attacked by water or nucleophilic species that decompose the dyes and that have excellent durability are provided. be able to.
- R 51 and R 52 to R 81 each independently represent a hydrogen atom or a substituent.
- substituents include those similar to R 8 to R 47 .
- R 52 to R 81 those bonded to the adjacent carbon atom of the same benzene ring may have a cyclic structure directly or via another atom or group. This cyclic structure is the same as the examples given for R 8 to R 47 .
- At least one of R 67 to R 81 is an acidic group or a group having an acidic group.
- Examples of the acidic group include a carboxyl group, a sulfonic acid group, a hydroxyl group, a hydroxamic acid group, a phosphoryl group, and a phosphonyl group, and a carboxyl group is preferable.
- the number of acidic groups in the metal complex dye is 1 or 2.
- M 1 and M 2 represent two hydrogen atoms, two metal atoms, or one metal atom (including those in an oxide state).
- Preferred metal atoms are Ti, V, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn, Hf.
- B has the same meaning as in the general formula (1).
- the compound of the general formula (10) is in the form of general formula (3) and part of R X and pyrrole ring in (4) is bonded in a form incorporated in the linking group B.
- the general formula (1) preferably has a structure represented by the following general formula (11).
- the dye having the structure of the general formula (11) is particularly excellent in durability, the dye is flat as a whole, excellent in the ability to absorb long wavelength light, and has a high conversion efficiency photoelectric conversion element and photoelectrochemical cell. Obtainable.
- R 49 , R 50 and R 52 to R 81 each independently represent a hydrogen atom or a substituent. Examples of the substituent are the same as the examples given for R 8 to R 47 .
- R 52 to R 81 those bonded to the adjacent carbon atom of the same benzene ring may have a cyclic structure directly or via another atom or group. This cyclic structure is the same as the examples given for R 8 to R 47 .
- R 52 to R 81 are at least one acidic group or a group having an acidic group.
- the acidic group examples include a carboxyl group, a sulfonic acid group, a hydroxyl group, a hydroxamic acid group, a phosphoryl group, and a phosphonyl group. Among these, a carboxyl group is preferable.
- the number of acidic groups in the metal complex dye is 1 or 2.
- preferable metal atoms are Ti, V, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, and Pb. More preferred are Zn, Ru, V, Sn, In, Pb, and Os. Examples of the oxide state include VO and TiO.
- R 67 , R 68 , R 71 , R 72 , R 75 and R 76 are an acidic group or a group having an acidic group. Although the reason for this is not yet clear, it is considered that the metal complex dye can be adsorbed to the porous semiconductor fine particles at the acidic group portion.
- the acidic group is R 60 , R 61 , R 78 , R 79 , R 75 . It is considered that due to the obstacle, the acidic group is difficult to be adsorbed on the porous semiconductor fine particles, and the dye is easily peeled after the adsorption, which may cause a problem in durability. If there are one or two acidic groups or acidic groups, the dye can be oriented and adsorbed on the porous semiconductor fine particles, and the durability can be improved.
- the present invention it is preferable to further have an electron withdrawing group on the atom to which the acidic group is bonded.
- the induction effect of the electron withdrawing group (-I effect) can increase the probability of existence of electrons in the portion close to the porous semiconductor fine particles, efficiently inject electrons into the semiconductor fine particle layer, and photoelectric conversion The conversion efficiency of an element or a photoelectrochemical cell can be improved.
- the structure having the acidic group has a structure represented by the following general formula (12).
- this structure not only the induction effect ( ⁇ I effect) of the cyano group but also contributions due to resonance stabilization can be obtained, so that the conversion efficiency of the photoelectric conversion element and the photoelectrochemical cell can be further improved.
- both or any one of R 71 and R 72 is an acidic group having the structure of the general formula (12) or a group having an acidic group.
- the metal complex dye is adsorbed on the porous semiconductor fine particles at the acidic group, and the photoelectric conversion element or light The conversion efficiency and durability of the electrochemical cell can be improved.
- the maximum absorption wavelength on the longest wavelength side in the solution is in the range of 500 to 1200 nm, and more preferably in the range of 700 to 1100 nm.
- the binuclear metal complex dye of the present invention can be prepared by, for example, two methods as shown in the following synthesis scheme.
- P 1 to P 4 in the formula represent substituents involved in the coupling reaction.
- Ba represents a group that forms a linking group B together with the residues P 1 to P 4 after coupling.
- a mononuclear metal complex (porphyrin or the like) can be obtained by reacting a pyrrole ring having various substituents in the presence of an aldehyde.
- a binuclear metal complex can be obtained by performing a coupling reaction in accordance with a connecting site with another mononuclear or binuclear metal complex.
- transduction of a metal is obtained by heating and stirring with a suitable solvent with a metal salt.
- An intermediate having two adjacent cyano groups for example, phthalonitrile
- a metal species in a solvent such as quinoline is heated and stirred together with a metal species in a solvent such as quinoline.
- an intermediate for example, a tetracyanobenzene derivative or two phthalonitrile derivatives linked by a linking group B
- two adjacent cyano groups in the same skeleton is reacted at the same time, or a mononuclear metal
- two adjacent cyano groups are introduced and the same reaction is performed.
- XA-1 to 12, XA-20 to 25 Preferred specific examples (XA-1 to 12, XA-20 to 25) of the metal complex dye represented by the general formula (1) are shown below, but the present invention is not limited to the following specific examples. .
- XA-1 to 12, B-1 to B-19, C-1 to C-15, and D-1 to D-9 represent the following linking groups or functional groups. * Indicates a binding position.
- Ha represents a structure represented by the following H-1 to H-17. Two types of * adjacent to H-1 to H-17 are selected and combined with XA-25. In XA-20, n is 1 to 5.
- (A2) Dye having the structure represented by the general formula (13) In the photoelectric conversion element and the photoelectrochemical cell of the present invention, the dye represented by the following general formula (13) together with the dye having the structure of the general formula (1). A dye having the structure is used. Mz (LL 1 ) m1 (LL 2 ) m2 (X) m3 ⁇ CI General formula (13) In the dye having the structure of the general formula (13), at least one of the ligand LL 1 and the ligand LL 2 and optionally a specific functional group X are coordinated to a metal atom. It is kept electrically neutral by CI. (A2-1) Metal atom Mz Mz represents a metal atom.
- Mz is preferably a metal capable of tetracoordinate or hexacoordinate, and more preferably Ru, Fe, Os, Cu, W, Cr, Mo, Ni, Pd, Pt, Co, Ir, Rh, Re, Mn Or it is Zn. Particularly preferred is Ru, Os, Zn or Cu, and most preferred is Ru.
- the ligand LL 1 is a bidentate or tridentate ligand represented by the bidentate or tridentate ligand represented by the following general formula (14), preferably a bidentate ligand. is there.
- M1 representing the number of the ligand LL 1 is an integer of 0 to 3, preferably 1 to 3, and more preferably 1.
- LL 1 may be the same or different.
- the m1, at least one of m2 representing the number of ligands LL 2 below is an integer of 1 or more.
- the metal atom, the ligand LL 1 and / or ligand LL 2 is coordinated.
- R 101 and R 102 in the general formula (14) each independently represent an acidic group, for example, a carboxyl group, a sulfonic acid group, a hydroxyl group, a hydroxamic acid group (preferably a hydroxamic acid group having 1 to 20 carbon atoms, such as , —CONHOH, —CONCH 3 OH, etc.), phosphoryl groups (eg —OP (O) (OH) 2 etc.) and phosphonyl groups (eg —P (O) (OH) 2 etc.), preferably carboxyl groups A phosphonyl group, more preferably a carboxyl group.
- R 101 and R 102 may be substituted on any carbon atom on the pyridine ring.
- R 103 and R 104 each independently represent a substituent, preferably an alkyl group (preferably an alkyl group having 1 to 20 carbon atoms, such as methyl, ethyl, isopropyl, t-butyl, pentyl, heptyl, 1 -Ethylpentyl, benzyl, 2-ethoxyethyl, 1-carboxymethyl, etc.), alkenyl groups (preferably alkenyl groups having 2 to 20 carbon atoms such as vinyl, allyl, oleyl, etc.), alkynyl groups (preferably carbon atoms) Alkynyl groups having 2 to 20 carbon atoms such as ethynyl, butadiynyl, phenylethynyl, etc., cycloalkyl groups (preferably cycloalkyl groups having 3 to 20 carbon atoms such as cyclopropyl, cyclopentyl, cyclohexyl,
- acylamino groups such as acetylamino, benzoylamino, etc.
- a cyano group, or a halogen atom for example, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, etc.
- a halogen atom for example, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, etc.
- an alkyl group an alkenyl group, an aryl group, a heterocyclic group, an alkoxy group, an aryloxy group, an alkoxy group.
- a carbonyl group, an amino group, an acylamino group, a cyano group or a halogen atom particularly preferably an alkyl group, an alkenyl group, a heterocyclic group, an alkoxy group, an alkoxycarbonyl group, an amino group, an acylamino group or a cyano group.
- the ligand LL 1 contains an alkyl group, an alkenyl group or the like, these may be linear or branched, and may be substituted or unsubstituted. Further, when the ligand LL 1 contains an aryl group, a heterocyclic group or the like, they may be monocyclic or condensed and may be substituted or unsubstituted.
- R 105 and R 106 are each independently an alkyl group (for example, methyl, ethyl, isopropyl, t-butyl, pentyl, heptyl, 1-ethylpentyl, benzyl, 2-ethoxyethyl, 1- Carboxymethyl and the like, preferably those having 5 or more carbon atoms), aromatic groups (preferably aromatic groups having 6 to 30 carbon atoms, such as phenyl, substituted phenyl, naphthyl, substituted naphthyl, etc.) or heterocyclic groups ( Preferably, it is a heterocyclic group having 1 to 30 carbon atoms, such as 2-thienyl, 2-pyrrolyl, 2-imidazolyl, 1-imidazolyl, 4-pyridyl, 3-indolyl), preferably 1 to 3 electrons.
- alkyl group for example, methyl, ethyl, isopropyl, t-butyl, penty
- the electron donating group is an alkyl group, an alkenyl group, an alkynyl group, a cycloalkyl group, an alkoxy group, an aryloxy group, an amino group, an acylamino group (preferred examples are the same as those for R 11 and R 12 ) or a hydroxyl group. And more preferably an alkyl group, an alkoxy group, an amino group or a hydroxyl group, and particularly preferably an alkyl group.
- R 105 and R 106 may be the same or different, but are preferably the same.
- R 105 and R 106 may be directly bonded to the pyridine ring.
- R 105 and R 106 may be bonded to the pyridine ring via L 1 and / or L 2 .
- L 1 and L 2 are each independently at least one selected from an arylene group, a heteroarylene group, an ethenylene group, and an ethynylene group, and L 1 and L 2 are each independently bonded pyridine rings It is conjugated with.
- These groups may be unsubstituted or may have a substituent.
- the substituent is preferably an alkyl group, and more preferably methyl.
- L 1 and L 2 are each independently preferably ethenylene, ethynylene, arylene and heteroarylene having 2 to 18 carbon atoms, more preferably ethenylene, ethynylene and arylene, and most preferably arylene and ethynylene. Since L 1 and L 2 are highly linear ligands, the wavelength range in which the dye of the general formula (14) absorbs light can be expanded, and the ligand LL 2 is adsorbed on the semiconductor fine particles. It becomes easy. L 1 and L 2 may be the same or different, but are preferably the same.
- each double bond may be a trans isomer, a cis isomer, or a mixture thereof.
- d1 and d2 are each an integer of 0 or more, preferably an integer of 1 to 3.
- d3 is 0 or 1
- a1 and a2 each independently represent an integer of 0 to 3.
- a1 is R 101 when 2 or more may be the same or different
- a2 is 2 or more when R 102 may be the same or different.
- a1 is preferably 0 or 1
- a2 is preferably an integer of 0-2.
- a2 is preferably 1 or 2
- d3 is 1 or 1
- a2 is preferably 0 or 1.
- the sum of a1 and a2 is preferably an integer of 0-2.
- b1 and b2 each independently represents an integer of 0 to 3, preferably an integer of 0 to 2.
- R 103 may be the same or different and may be connected to each other to form a ring.
- R 104 may be the same or different, and may be connected to each other to form a ring.
- R 103 and R 104 may be linked to form a ring.
- the ring to be formed include a benzene ring, a pyridine ring, a thiophene ring, a pyrrole ring, a cyclohexane ring, a cyclopentane ring and the like.
- m1 in the general formula (13) is preferably 2 or 3, and preferably 2. Is more preferable.
- the ligand LL 1 in the general formula (13) is preferably represented by the following general formula (16-1), (16-2) or (16-3).
- R 101 to R 104 , a1, a2, b1, b2, and d1 to d3 have the same meanings as in the general formula (14).
- b3 represents an integer of 0 to 3, preferably an integer of 0 to 2.
- R 107 and R 108 are written as substituted on one ring for the sake of illustration, but they may be present on the ring or different from those shown. It may be substituted on the ring.
- R 107 represents an acidic group or a group having an acidic group, preferably a carboxyl group, a sulfonic acid group, a hydroxyl group, a hydroxamic acid group, a phosphoryl group, or a phosphonyl group, more preferably A carboxyl group or a phosphoryl group, particularly preferably a carboxyl group.
- R 108 represents a substituent, preferably an alkyl group, an alkenyl group, an alkynyl group, a cycloalkyl group, an alkoxy group, an aryloxy group, an amino group or an acylamino group (above preferred examples are R 103 and R 104 in the general formula (14)), and more preferably an alkyl group, an alkoxy group, an amino group, or an acylamino group.
- R 121 to R 124 each independently represents hydrogen, an alkyl group, an alkenyl group, or an aryl group. Preferred examples of R 121 to R 124 are the same as the preferred examples of R 103 and R 104 in formula (14). R 121 to R 124 are more preferably an alkyl group or an aryl group, and more preferably an alkyl group. When R 121 to R 124 are alkyl groups, they may further have a substituent, and the substituent is preferably an alkoxy group, a cyano group, an alkoxycarbonyl group or a carbonamido group, particularly preferably an alkoxy group.
- R 121 and R 122 and R 123 and R 124 may be connected to each other to form a ring.
- a pyrrolidine ring, a piperidine ring, a piperazine ring, a morpholine ring or the like is preferable.
- R 125 , R 126 , R 127 and R 128 each independently represent a substituent, preferably an alkyl group, an alkenyl group, an alkynyl group, a cycloalkyl group, An alkoxy group, an aryloxy group, an amino group, an acylamino group (the preferred examples are the same as those for R 101 in the general formula (14)) or a hydroxyl group, more preferably an alkyl group, an alkoxy group, an amino group. Group or acylamino group. Particularly preferably, R 125 and R 126 are alkyl groups, and R 127 and R 128 are alkynyl groups.
- a3 represents an integer of 0 to 3, preferably an integer of 0 to 2.
- a3 is preferably 1 or 2
- a3 is preferably 0 or 1.
- a3 is the R 107 when two or more may be the same or different.
- d1 and d2 each independently represents an integer of 0 to 4.
- R 125 may be linked to R 121 and / or R 122 to form a ring.
- the ring formed is preferably a piperidine ring or a pyrrolidine ring.
- R 125 may be the same or different, and may be linked to each other to form a ring.
- R 126 may be linked to R 123 and / or R 124 to form a ring.
- the ring formed is preferably a piperidine ring or a pyrrolidine ring.
- R 126 may be the same or different, and may be linked to each other to form a ring.
- LL 2 represents a bidentate or tridentate ligand.
- M2 representing the number of the ligand LL 2 is an integer of 0 to 2, and is preferably 0 or 1.
- m2 is LL 2 when the two may be the same or different. However, the m2, at least one of which is an integer of 1 or more of the m1 representing the number of ligands LL 1 above.
- Ligand LL 2 is a bidentate or tridentate ligand represented by the following general formula (15).
- Za, Zb, and Zc each independently represent a nonmetallic atom group that can form a 5-membered ring or a 6-membered ring.
- the formed 5-membered or 6-membered ring may be substituted or unsubstituted, and may be monocyclic or condensed.
- Za, Zb and Zc are preferably composed of a carbon atom, a hydrogen atom, a nitrogen atom, an oxygen atom, a sulfur atom, a phosphorus atom and / or a halogen atom, and preferably form an aromatic ring.
- an imidazole ring, an oxazole ring, a thiazole ring or a triazole ring is preferably formed.
- a pyridine ring, a pyrimidine ring, a pyridazine ring or a pyrazine ring is preferably formed.
- an imidazole ring or a pyridine ring is more preferable.
- c represents 0 or 1.
- c is preferably 0, and LL 2 is preferably a bidentate ligand.
- the ligand LL 2 is preferably represented by any of the following general formulas (17-1) to (17-8), and the general formulas (17-1), (17-2), (17-4) ) Or (17-6), more preferably represented by formula (17-1) or (17-2), and represented by formula (17-1). Is most preferred.
- R 151 to R 166 are written as substituted on one ring for the convenience of illustration. It may be substituted on a different ring from that described.
- R 151 to R 158 each independently represent an acidic group.
- R 151 to R 158 are, for example, a carboxyl group, a sulfonic acid group, a hydroxyl group, a hydroxamic acid group (preferably a hydroxamic acid group having 1 to 20 carbon atoms, such as —CONHOH, —CONCH 3 OH, etc.), a phosphoryl group ( For example, —OP (O) (OH) 2 etc.) or a phosphonyl group (eg —P (O) (OH) 2 etc.) is represented.
- R 151 to R 158 are preferably a carboxyl group, a phosphoryl group, or a phosphonyl group, more preferably a carboxyl group or a phosphonyl group, and more preferably a carboxyl group.
- the acidic group may be accompanied by any linking group.
- R 159 to R 166 each independently represent a substituent, preferably an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, a heterocyclic group, or an alkoxy group.
- Aryloxy group, alkoxycarbonyl group, amino group, acyl group, sulfonamido group, acyloxy group, carbamoyl group, acylamino group, cyano group, or halogen atom More preferably an alkyl group, an alkenyl group, an aryl group, a heterocyclic group, an alkoxy group, an alkoxycarbonyl group, an amino group, an acylamino group or a halogen atom, particularly preferably an alkyl group or an alkenyl group.
- R 167 to R 171 each independently represent a hydrogen atom, an aliphatic group, an aromatic group, or a heterocyclic group bonded with a carbon atom, An aliphatic group, and more preferably an aliphatic group having a carboxyl group.
- the ligand LL 2 contains an alkyl group, an alkenyl group or the like, they may be linear or branched and may be unsubstituted substituted.
- LL 2 is an aryl group, when containing heterocyclic group, they may be a condensed ring may be monocyclic or unsubstituted substituted.
- R 151 to R 166 may be bonded to any position on the ring.
- E1 to e6 each independently represents an integer of 0 to 4, preferably an integer of 0 to 2.
- e7 and e8 each independently represents an integer of 0 to 4, preferably an integer of 0 to 3.
- e9 to e12 and e15 each independently represents an integer of 0 to 6, and e13, e14 and e16 each independently represents an integer of 0 to 4. It is preferable that e9 to e16 are each independently an integer of 0 to 3.
- R 151 to R 158 may be the same or different.
- R 159 to R 166 may be the same or different and are connected to each other. To form a ring.
- X represents a monodentate or bidentate ligand.
- M3 representing the number of ligands X represents an integer of 0 to 2, and m3 is preferably 1 or 2.
- m3 is preferably 2.
- X is a bidentate ligand, m3 is preferably 1.
- Xs may be the same or different, and Xs may be linked together.
- the ligand X is preferably an acyloxy group (preferably an acyloxy group having 1 to 20 carbon atoms, such as acetyloxy, benzoyloxy, salicylic acid, glycyloxy, N, N-dimethylglycyloxy, oxalylene (—OC ( O) C (O) O—)), acylthio groups (preferably acylthio groups having 1 to 20 carbon atoms, such as acetylthio, benzoylthio, etc.), thioacyloxy groups (preferably thios having 1 to 20 carbon atoms).
- acyloxy group preferably an acyloxy group having 1 to 20 carbon atoms, such as acetyloxy, benzoyloxy, salicylic acid, glycyloxy, N, N-dimethylglycyloxy, oxalylene (—OC ( O) C (O) O—)
- acylthio groups preferably
- thioacylthio groups such as thioacetyloxy groups (CH 3 C (S) O—), etc.)
- thioacylthio groups preferably thioacylthio groups having 1 to 20 carbon atoms, such as thioacetylthio (CH 3 C (S)) S-), thiobenzoylthio (PhC (S) S-) etc.
- acylaminooxy group preferably the number of carbon atoms 1-20 acylaminooxy groups such as N-methylbenzoylaminooxy (PhC (O) N (CH 3 ) O—), acetylaminooxy (CH 3 C (O) NHO—), etc.)
- thiocarbamate A group preferably a thiocarbamate group having 1 to 20 carbon atoms such as N, N-diethylthiocarbamate
- a dithiocarbamate group preferably a dithiocarbamate group having 1 to 20 carbon atom
- the ligand X is preferably an acyloxy group, a thioacylthio group, an acylaminooxy group, a dithiocarbamate group, a dithiocarbonate group, a trithiocarbonate group, a thiocyanate group, an isothiocyanate group, a cyanate group, an isocyanate group, a cyano group, A ligand coordinated by a group selected from the group consisting of an alkylthio group, an arylthio group, an alkoxy group and an aryloxy group, or a ligand consisting of a halogen atom, carbonyl, 1,3-diketone or thiourea, More preferably, a ligand coordinated by a group selected from the group consisting of acyloxy group, acylaminooxy group, dithiocarbamate group, thiocyanate group, isothiocyanate group, cyanate group, isocyanate group, cyano
- the ligand X contains an alkyl group, an alkenyl group, an alkynyl group, an alkylene group or the like, these may be linear or branched, and may be substituted or unsubstituted.
- an aryl group, a heterocyclic group, a cycloalkyl group, etc. may be substituted or unsubstituted, and may be monocyclic or condensed.
- X is a bidentate ligand
- X is an acyloxy group, acylthio group, thioacyloxy group, thioacylthio group, acylaminooxy group, thiocarbamate group, dithiocarbamate group, thiocarbonate group, dithiocarbonate group, trithio
- a ligand composed of urea is preferable.
- X is a monodentate ligand
- X is a ligand coordinated by a group selected from the group consisting of a thiocyanate group, an isothiocyanate group, a cyanate group, an isocyanate group, a cyano group, an alkylthio group, and an arylthio group, or A ligand composed of a halogen atom, carbonyl, dialkyl ketone, or thiourea is preferred.
- Counter ion CI CI in the general formula (14) represents a counter ion when a counter ion is necessary to neutralize the charge.
- a dye is a cation or an anion or has a net ionic charge depends on the metal, ligand and substituent in the dye.
- the dye of the general formula (14) may be dissociated and have a negative charge because the substituent has a dissociable group.
- the charge of the whole dye of the general formula (14) is electrically neutralized by CI.
- the counter ion CI is a positive counter ion
- the counter ion CI is an inorganic or organic ammonium ion (for example, tetraalkylammonium ion, pyridinium ion, etc.), an alkali metal ion, or a proton.
- the counter ion CI may be an inorganic anion or an organic anion.
- a halogen anion eg, fluoride ion, chloride ion, bromide ion, iodide ion, etc.
- substituted aryl sulfonate ion eg, p-toluene sulfonate ion, p-chlorobenzene sulfonate ion, etc.
- aryl disulfone Acid ions for example, 1,3-benzenedisulfonate ion, 1,5-naphthalenedisulfonate ion, 2,6-naphthalenedisulfonate ion, etc.
- alkyl sulfate ions for example, methyl sulfate ion
- sulfate ions thiocyanate ions Perchlorate ion
- an ionic polymer or another dye having a charge opposite to that of the dye may be used as the charge balance counter ion, and a metal complex ion (for example, bisbenzene-1,2-dithiolatonickel (III)) can also be used. is there.
- the dye having the structure represented by the general formula (13) preferably has at least one suitable bonding group for the surface of the semiconductor fine particles. It is more preferable that the bonding group has 1 to 6 bonding groups, and it is particularly preferable that the bonding group has 1 to 4 bonding groups. Carboxyl group, sulfonic acid group, hydroxyl group, hydroxamic acid group (for example, —CONHOH), phosphoryl group (for example, —OP (O) (OH) 2, etc.), phosphonyl group (for example, —P (O) (OH) 2, etc.) It is preferable that the dye has an acidic group (substituent having a dissociable proton).
- the dye having the structure represented by the general formula (13) used in the present invention is shown below, but the present invention is not limited thereto.
- dye in the following specific example contains the ligand which has a proton dissociable group, this ligand may dissociate as needed and may discharge
- the dye represented by the general formula (13) of the present invention can be synthesized with reference to Japanese Patent Application Laid-Open No. 2001-291534 and a method cited in the publication.
- the maximum absorption wavelength in the solution is preferably in the range of 300 to 1000 nm, more preferably in the range of 350 to 950 nm, and particularly preferably in the range of 370 to 900 nm. .
- (A1) a dye containing a binuclear metal complex dye having the structure of the general formula (1) as an essential component is used. More preferably, by using the pigment having the structure of the general formula (13) in combination, light having a wide range of wavelengths can be used, high conversion efficiency can be ensured, and the reduction rate of conversion efficiency can be reduced.
- iodine and iodide for example, lithium iodide, tetrabutylammonium iodide, tetrapropylammonium iodide, etc.
- alkyl viologen for example, methyl viologen chloride, hexyl viologen bromide, benzyl viologen tetrafluoroborate
- polyhydroxybenzenes for example, hydroquinone, naphthohydroquinone, etc.
- divalent and trivalent iron complexes for example, red blood salt and yellow blood salt
- a combination of iodine and iodide is preferred.
- the cation of the iodine salt is preferably a 5-membered or 6-membered nitrogen-containing aromatic cation.
- the compound represented by the general formula (2) is not an iodine salt, it is described in WO95 / 18456, JP-A-8-259543, Electrochemistry, Vol. 65, No. 11, page 923 (1997), etc. It is preferable to use iodine salts such as pyridinium salts, imidazolium salts, and triazolium salts.
- the electrolyte composition used in the photoelectric conversion element of the present invention preferably contains iodine together with the heterocyclic quaternary salt compound.
- the iodine content is preferably from 0.1 to 20% by mass, more preferably from 0.5 to 5% by mass, based on the entire electrolyte composition.
- the electrolyte composition used for the photoelectric conversion element of the present invention may contain a solvent.
- the content of the solvent in the electrolyte composition is preferably 50% by mass or less, more preferably 30% by mass or less, and particularly preferably 10% by mass or less based on the entire composition.
- a solvent having a low viscosity and high ion mobility, a high dielectric constant and capable of increasing the effective carrier concentration, or both is preferable because it exhibits excellent ion conductivity.
- solvents include carbonate compounds (ethylene carbonate, propylene carbonate, etc.), heterocyclic compounds (3-methyl-2-oxazolidinone, etc.), ether compounds (dioxane, diethyl ether, etc.), chain ethers (ethylene glycol dialkyl ether, Propylene glycol dialkyl ether, polyethylene glycol dialkyl ether, polypropylene glycol dialkyl ether, etc.), alcohols (methanol, ethanol, ethylene glycol monoalkyl ether, propylene glycol monoalkyl ether, polyethylene glycol monoalkyl ether, polypropylene glycol monoalkyl ether, etc.), Polyhydric alcohols (ethylene glycol, propylene glycol, polyethylene glycol , Propylene glycol, g
- an electrochemically inert salt that is in a liquid state at room temperature and / or has a melting point lower than room temperature may be used as the electrolyte solvent.
- the electrolyte solvent For example, 1-ethyl-3-methylimidazolium trifluoromethanesulfonate, 1-butyl-3-methylimidazolium trifluoromethanesulfonate, etc., nitrogen-containing heterocyclic quaternary salt compounds such as imidazolium salts and pyridinium salts, or tetraalkylammonium salts Is mentioned.
- the electrolyte composition used in the photoelectric conversion element of the present invention may be added with a polymer or an oil gelling agent, or may be gelled (solidified) by a technique such as polymerization of polyfunctional monomers or polymer crosslinking reaction. .
- the polyfunctional monomers are preferably compounds having two or more ethylenically unsaturated groups, such as divinylbenzene, ethylene glycol diacrylate, ethylene glycol dimethacrylate, diethylene glycol diacrylate, diethylene glycol dimethacrylate, triethylene glycol diacrylate, triethylene glycol Ethylene glycol dimethacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate and the like are preferable.
- divinylbenzene ethylene glycol diacrylate, ethylene glycol dimethacrylate, diethylene glycol diacrylate, diethylene glycol dimethacrylate, triethylene glycol diacrylate, triethylene glycol Ethylene glycol dimethacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate and the like are preferable.
- the gel electrolyte may be formed by polymerization of a mixture containing a monofunctional monomer in addition to the above polyfunctional monomers.
- Monofunctional monomers include acrylic acid or ⁇ -alkyl acrylic acid (acrylic acid, methacrylic acid, itaconic acid, etc.) or esters or amides thereof (methyl acrylate, ethyl acrylate, n-propyl acrylate, i-propyl acrylate, n- Butyl acrylate, i-butyl acrylate, t-butyl acrylate, n-pentyl acrylate, 3-pentyl acrylate, t-pentyl acrylate, n-hexyl acrylate, 2,2-dimethylbutyl acrylate, n-octyl acrylate, 2-ethylhexyl acrylate 4-methyl-2-propylpentyl acrylate, acetyl acrylate, acetyl
- the blending amount of the polyfunctional monomer is preferably 0.5 to 70% by mass and more preferably 1.0 to 50% by mass with respect to the whole monomer.
- the above-mentioned monomers are the same as those described in Takayuki Otsu and Masaaki Kinoshita “Experimental Methods for Polymer Synthesis” (Chemistry Dojin) and Takayuki Otsu “Lecture Polymerization Reaction Theory 1 Radical Polymerization (I)” (Chemical Doujinshi). Polymerization can be performed by radical polymerization which is a polymer synthesis method.
- the monomer for gel electrolyte used in the present invention can be radically polymerized by heating, light or electron beam, or electrochemically, and is particularly preferably radically polymerized by heating.
- preferably used polymerization initiators are 2,2′-azobisisobutyronitrile, 2,2′-azobis (2,4-dimethylvaleronitrile), dimethyl 2,2′-azobis (2-methylpropyl). Pionate), azo initiators such as dimethyl 2,2′-azobisisobutyrate, peroxide initiators such as lauryl peroxide, benzoyl peroxide, and t-butyl peroctoate.
- a preferable addition amount of the polymerization initiator is 0.01 to 20% by mass, and more preferably 0.1 to 10% by mass with respect to the total amount of monomers.
- the weight composition range of the monomer in the gel electrolyte is preferably 0.5 to 70% by mass. More preferably, the content is 1.0 to 50% by mass.
- a polymer having a reactive group capable of crosslinking is added to the composition and a crosslinking agent.
- Preferred reactive groups are nitrogen-containing heterocycles such as pyridine ring, imidazole ring, thiazole ring, oxazole ring, triazole ring, morpholine ring, piperidine ring, piperazine ring, and the preferred crosslinking agent is a functional group capable of nucleophilic attack by the nitrogen atom.
- the electrolyte composition of the present invention metal iodides (LiI, NaI, KI, CsI , CaI 2 , etc.), a metal bromide (LiBr, NaBr, KBr, CsBr , CaBr 2 , etc.), quaternary ammonium bromine salt (tetraalkylammonium Ammonium bromide, pyridinium bromide, etc.), metal complexes (ferrocyanate-ferricyanate, ferrocene-ferricinium ion, etc.), sulfur compounds (sodium polysulfide, alkylthiol-alkyldisulfides, etc.), viologen dye, hydroquinone-quinone Etc. may be added. These may be used as a mixture.
- J. Am. Ceram. Soc. 80, (12), 3157-3171 (1997), or basic compounds such as 2-picoline and 2,6-lutidine may be added.
- a preferred concentration range is 0.05 to 2M.
- a charge transport layer containing a hole conductor material may be used as the electrolyte.
- the hole conductor material 9,9'-spirobifluorene derivatives and the like can be used.
- an electrode layer, a photoelectric conversion layer, a hole transport layer, a conductive layer, and a counter electrode layer can be sequentially stacked.
- a hole transport material that functions as a p-type semiconductor can be used as a hole transport layer.
- an inorganic or organic hole transport material can be used as a preferred hole transport layer.
- the inorganic hole transport material include CuI, CuO, and NiO.
- the organic hole transport material include high molecular weight materials and low molecular weight materials, and examples of the high molecular weight materials include polyvinyl carbazole, polyamine, and organic polysilane.
- organic polysilanes are preferable because, unlike conventional carbon-based polymers, ⁇ electrons delocalized along the main chain Si contribute to photoconduction and have high hole mobility (Phys. Rev. B, 35, 2818 (1987)).
- the conductive layer in the present invention is not particularly limited as long as it has good conductivity, and examples thereof include inorganic conductive materials, organic conductive materials, conductive polymers, and intermolecular charge transfer complexes. Among them, an intermolecular charge transfer complex formed from a donor material and an acceptor material is preferable. Among these, what was formed from the organic donor and the organic acceptor can be used preferably. *
- the donor material is preferably a material rich in electrons in the molecular structure.
- organic donor materials include those having a substituted or unsubstituted amine group, hydroxyl group, ether group, selenium or sulfur atom in the ⁇ -electron system of the molecule, specifically, phenylamine-based, triphenylmethane , Carbazole, phenol, and tetrathiafulvalene materials.
- the acceptor material those lacking electrons in the molecular structure are preferable.
- organic acceptor materials include fullerenes, those having a substituent such as a nitro group, a cyano group, a carboxyl group or a halogen group in the ⁇ -electron system of the molecule, specifically, PCBM, benzoquinone, naphthoquinone, etc. Quinone, fluoroenone, chloranil, bromanyl, tetracyanoquinodimethane, tetracyanoethylene and the like.
- the thickness of the conductive layer is not particularly limited, but is preferably such that the porous layer can be completely filled.
- (C) Conductive Support As shown in FIG. 1, in the photoelectric conversion element of the present invention, a photosensitive member 2 in which a dye 21 is adsorbed on porous semiconductor fine particles 22 is formed on a conductive support 1. ing. As described later, for example, the photosensitive layer can be produced by immersing the dispersion of semiconductor fine particles in the dye solution of the present invention after coating and drying on a conductive support.
- the conductive support there can be used a glass or a polymer material having a conductive film layer on the surface, such as a metal that is conductive in the support itself. It is preferable that the conductive support is substantially transparent. Substantially transparent means that the light transmittance is 10% or more, preferably 50% or more, particularly preferably 80% or more.
- a glass or polymer material coated with a conductive metal oxide can be used as the conductive support. The coating amount of the conductive metal oxide at this time is preferably 0.1 to 100 g per 1 m 2 of glass or polymer material support. When a transparent conductive support is used, light is preferably incident from the support side.
- polymer materials examples include tetraacetyl cellulose (TAC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), syndiotactic polystyrene (SPS), polyphenylene sulfide (PPS), polycarbonate (PC), Examples include polyarylate (PAR), polysulfone (PSF), polyester sulfone (PES), polyetherimide (PEI), cyclic polyolefin, and brominated phenoxy.
- a surface may be provided with a light management function. For example, an antireflection film in which a high refractive film and a low refractive index oxide film described in JP-A-2003-123859 are alternately laminated, The light guide function described in 2002-260746 is raised.
- a metal support can also be preferably used.
- examples thereof include titanium, aluminum, copper, nickel, iron, stainless steel, and copper. These metals may be alloys. More preferably, titanium, aluminum, and copper are preferable, and titanium and aluminum are particularly preferable.
- the conductive support has a function of blocking ultraviolet light.
- a method in which a fluorescent material capable of changing ultraviolet light into visible light is present in the transparent support or on the surface of the transparent support, and a method using an ultraviolet absorber are also included.
- a function described in JP-A-11-250944 may be further provided on the conductive support.
- Preferred conductive films include metals (eg, platinum, gold, silver, copper, aluminum, rhodium, indium, etc.), carbon, or conductive metal oxides (indium-tin composite oxide, tin oxide doped with fluorine, etc.) ).
- the thickness of the conductive film layer is preferably 0.01 to 30 ⁇ m, more preferably 0.03 to 25 ⁇ m, and particularly preferably 0.05 to 20 ⁇ m.
- the range of the surface resistance is preferably 50 ⁇ / cm 2 or less, more preferably 10 ⁇ / cm 2 or less. Although there is no restriction
- a collecting electrode may be disposed.
- a gas barrier film and / or an ion diffusion prevention film may be disposed between the support and the transparent conductive film.
- the gas barrier layer a resin film or an inorganic film can be used.
- a transparent electrode and a porous semiconductor electrode photocatalyst containing layer may be provided.
- the transparent conductive layer may have a laminated structure, and as a preferable method, for example, FTO can be laminated on ITO.
- (D) Semiconductor Fine Particles As shown in FIG. 1, in the photoelectric conversion element of the present invention, a photosensitive layer 2 in which a dye 21 is adsorbed on porous semiconductor fine particles 22 is formed on a conductive support 1. . As will be described later, for example, a dispersion of semiconductor fine particles is applied to the conductive support and dried, and then immersed in the dye solution of the present invention to produce a photoreceptor.
- metal chalcogenides for example, oxides, sulfides, selenides, etc.
- perovskite fine particles are preferably used.
- the metal chalcogenide include titanium, tin, zinc, tungsten, zirconium, hafnium, strontium, indium, cerium, yttrium, lanthanum, vanadium, niobium, tantalum oxide, cadmium sulfide, cadmium selenide, and the like.
- Preferred perovskites include strontium titanate and calcium titanate. Of these, titanium oxide, zinc oxide, tin oxide, and tungsten oxide are particularly preferable.
- n-type In semiconductors, there are an n-type in which carriers involved in conduction are electrons and a p-type in which carriers are holes. In the element of the present invention, n-type is preferable in terms of conversion efficiency. In an n-type semiconductor, in addition to an intrinsic semiconductor (or an intrinsic semiconductor) having no impurity level and having the same carrier concentration due to conduction band electrons and valence band holes, the electron carrier concentration is reduced by structural defects derived from impurities. There are high n-type semiconductors.
- the n-type inorganic semiconductor preferably used in the present invention is TiO 2 , TiSrO 3 , ZnO, Nb 2 O 3 , SnO 2 , WO 3 , Si, CdS, CdSe, V 2 O 5 , ZnS, ZnSe, SnSe, KTaO. 3 , FeS 2 , PbS, InP, GaAs, CuInS 2 , CuInSe 2 and the like.
- the most preferred n-type semiconductors are TiO 2 , ZnO, SnO 2 , WO 3 , and Nb 2 O 3 .
- a semiconductor material in which a plurality of these semiconductors are combined is also preferably used.
- the average particle size of the primary particles is 2 nm to 50 nm, and the average primary particle size is 2 nm to 30 nm. More preferably, it is a fine particle. Two or more kinds of fine particles having different particle size distributions may be mixed. In this case, the average size of the small particles is preferably 5 nm or less.
- large particles having an average particle size exceeding 50 nm can be added to the ultrafine particles at a low content, or another layer can be applied.
- the content of the large particles is preferably 50% or less, more preferably 20% or less of the mass of particles having an average particle size of 50 nm or less.
- the average particle size of the large particles added and mixed for the above purpose is preferably 100 nm or more, and more preferably 250 nm or more.
- the haze ratio is 60% or more by using large particles for light scattering.
- the haze ratio is expressed by (diffuse transmittance) / (total light transmittance).
- the gel-sol method described in Sakuo Sakuo's “Science of Sol-Gel Method”, Agne Jofu Co., Ltd. (1998) is preferable.
- a method of producing an oxide by high-temperature hydrolysis of chloride developed by Degussa in an oxyhydrogen salt is preferable.
- the semiconductor fine particles are titanium oxide
- the above sol-gel method, gel-sol method, and high-temperature hydrolysis method in oxyhydrogen salt of chloride are all preferred, but Kiyoshi Manabu's “Titanium oxide properties and applied technology”
- the sulfuric acid method and the chlorine method described in Gihodo Publishing (1997) can also be used.
- sol-gel method the method described in Journal of American Ceramic Society, Vol. 80, No. 12, 3157-3171 (1997), or the chemistry of Burnside et al.
- the method described in Materials, Vol. 10, No. 9, pages 2419-2425 is also preferable.
- a method for producing semiconductor fine particles for example, as a method for producing titania nanoparticles, preferably, a method by flame hydrolysis of titanium tetrachloride, a combustion method of titanium tetrachloride, hydrolysis of a stable chalcogenide complex, orthotitanic acid Of semiconductor, forming semiconductor fine particles from soluble and insoluble parts, then dissolving and removing soluble parts, hydrothermal synthesis of peroxide aqueous solution, or production of core / shell structured titanium oxide fine particles by sol-gel method A method is mentioned.
- crystal structure of titania examples include anatase type, brookite type, and rutile type, and anatase type and brookite type are preferable.
- ⁇ Titania nanotubes, nanowires, and nanorods may be mixed with titania fine particles.
- ⁇ Titania may be doped with a nonmetallic element or the like.
- an additive may be used on the surface to improve the necking or to prevent reverse electron transfer.
- preferred additives include ITO, SnO particles, whiskers, fibrous graphite / carbon nanotubes, zinc oxide necking binders, fibrous materials such as cellulose, metals, organic silicon, dodecylbenzenesulfonic acid, silane compounds, etc. Examples thereof include a mobile binding molecule and a potential gradient dendrimer.
- titania may be acid-base or redox treated before dye adsorption. Etching, oxidation treatment, hydrogen peroxide treatment, dehydrogenation treatment, UV-ozone, oxygen plasma, or the like may be used.
- (E) Semiconductor fine particle dispersion In the present invention, a semiconductor fine particle dispersion in which the solid content other than the semiconductor fine particles is 10% by mass or less of the entire semiconductor fine particle dispersion is applied to the conductive support.
- a porous semiconductor fine particle coating layer can be obtained by heating to a high temperature.
- a method of preparing a semiconductor fine particle dispersion is a method of depositing fine particles in a solvent and using them as they are when synthesizing a semiconductor. Ultrafine particles are irradiated with ultrasonic waves. Or a method of mechanically pulverizing and grinding using a mill or a mortar.
- the dispersion solvent water and / or various organic solvents can be used. Examples of the organic solvent include alcohols such as methanol, ethanol, isopropyl alcohol, citronellol and terpineol, ketones such as acetone, esters such as ethyl acetate, dichloromethane, acetonitrile and the like.
- a polymer such as polyethylene glycol, hydroxyethyl cellulose, carboxymethyl cellulose, a surfactant, an acid, or a chelating agent may be used in a small amount as a dispersion aid.
- these dispersing aids are preferably removed by a filtration method, a method using a separation membrane, a centrifugal method or the like before the step of forming a film on a conductive support.
- the solid content other than the semiconductor fine particles can be 10% by mass or less of the total dispersion. This concentration is preferably 5% or less, more preferably 3% or less, and particularly preferably 1% or less.
- the solid content other than the solvent and the semiconductor fine particles can be 10% by mass or less of the entire semiconductor fine particle dispersion. It is preferable to consist essentially of semiconductor fine particles and a dispersion solvent.
- the viscosity of the dispersion is preferably 10 to 300 N ⁇ s / m 2 at 25 ° C. More preferably, it is 50 to 200 N ⁇ s / m 2 at 25 ° C.
- a roller method, a dip method, or the like can be used as an application method.
- an air knife method, a blade method, etc. can be used as a metering method.
- the application method and the metering method can be made the same part.
- the wire bar method disclosed in Japanese Patent Publication No. 58-4589, the slide hopper method described in US Pat. No. 2,681,294, etc., the extrusion The method and the curtain method are preferable. It is also preferable to apply by a spin method or a spray method using a general-purpose machine.
- the wet printing method intaglio, rubber plate, screen printing and the like are preferred, including the three major printing methods of letterpress, offset and gravure. From these, a preferred film forming method is selected according to the liquid viscosity and the wet thickness. Further, since the semiconductor fine particle dispersion of the present invention has a high viscosity and has a viscous property, it may have a strong cohesive force and may not be well adapted to the support during coating. In such a case, by performing cleaning and hydrophilization of the surface by UV ozone treatment, the binding force between the applied semiconductor fine particle dispersion and the surface of the conductive support increases, and the semiconductor fine particle dispersion can be easily applied.
- the preferred thickness of the entire semiconductor fine particle layer is 0.1 to 100 ⁇ m.
- the thickness of the semiconductor fine particle layer is further preferably 1 to 30 ⁇ m, and more preferably 2 to 25 ⁇ m.
- the amount of the semiconductor fine particles supported per 1 m 2 of the support is preferably 0.5 g to 400 g, more preferably 5 to 100 g.
- the applied semiconductor fine particle layer is subjected to heat treatment in order to enhance the electronic contact between the semiconductor fine particles and to improve the adhesion to the support and to dry the applied semiconductor fine particle dispersion. .
- heat treatment By this heat treatment, a porous semiconductor fine particle layer can be formed.
- light energy can be used in addition to heat treatment.
- the surface may be activated by applying light absorbed by the semiconductor fine particles such as ultraviolet light, or only the surface of the semiconductor fine particles may be activated by laser light or the like. Can do.
- the impurities adsorbed on the particle surface are decomposed by the activation of the particle surface, and can be brought into a preferable state for the above purpose.
- heat treatment and ultraviolet light it is preferable that heating be performed at 100 ° C. or higher and 250 ° C. or lower, or preferably 100 ° C. or higher and 150 ° C. or lower, while irradiating the semiconductor fine particles with light absorbed by the fine particles.
- impurities mixed in the fine particle layer can be washed by photolysis, and physical bonding between the fine particles can be strengthened.
- the semiconductor fine particle dispersion may be applied to the conductive support and subjected to other treatments besides heating and light irradiation. Examples of preferred methods include energization and chemical treatment.
- the pressure may be applied after application, and examples of the method of applying pressure include Japanese Patent Publication No. 2003-500857.
- Examples of light irradiation include JP-A No. 2001-357896.
- Examples of plasma, microwave, and energization include JP-A-2002-353453.
- Examples of the chemical treatment include JP-A-2001-357896.
- the method for coating the above-mentioned semiconductor fine particles on the conductive support is not only the method for coating the above-mentioned semiconductor fine particle dispersion on the conductive support, but also the semiconductor fine particle precursor described in Japanese Patent No. 2664194.
- a method such as a method of obtaining a semiconductor fine particle film by coating on a conductive support and hydrolyzing with moisture in the air can be used.
- Examples of the precursor include (NH 4 ) 2 TiF 6 , titanium peroxide, metal alkoxide / metal complex / metal organic acid salt, and the like.
- a method of forming a semiconductor film by applying a slurry in which a metal organic oxide (such as an alkoxide) coexists, and heat treatment, light treatment, etc., a slurry in which an inorganic precursor coexists, titania dispersed in the pH of the slurry The method which specified the property of particle
- a binder may be added to these slurries in a small amount, and examples of the binder include cellulose, fluoropolymer, crosslinked rubber, polybutyl titanate, carboxymethyl cellulose and the like.
- Techniques related to the formation of semiconductor fine particles or precursor layers thereof include corona discharge, plasma, a method of hydrophilizing by physical methods such as UV, a chemical treatment with alkali, polyethylenedioxythiophene and polystyrenesulfonic acid, polyaniline, etc. For example, formation of an interlayer film for bonding may be mentioned.
- dry method examples include vapor deposition, sputtering, and aerosol deposition method. Further, electrophoresis or electrodeposition may be used.
- a method of once forming a coating film on a heat-resistant substrate and then transferring it to a film such as plastic may be used.
- a method of transferring via EVA described in JP-A No. 2002-184475, a semiconductor layer / conductive layer on a sacrificial substrate containing an inorganic salt that can be removed with ultraviolet rays and an aqueous solvent described in JP-A No. 2003-98977 And a method of removing the sacrificial substrate after transfer to an organic substrate.
- the semiconductor fine particles preferably have a large surface area so that many dyes can be adsorbed.
- the surface area is preferably 10 times or more, more preferably 100 times or more the projected area.
- limiting in particular in this upper limit Usually, it is about 5000 times. JP-A-2001-93591 and the like are preferable as the structure of semiconductor fine particles.
- the greater the thickness of the semiconductor fine particle layer the higher the amount of dye that can be carried per unit area and the higher the light absorption efficiency, but the longer the diffusion distance of the generated electrons, the greater the loss due to charge recombination.
- the preferred thickness of the semiconductor fine particle layer varies depending on the use of the device, but is typically 0.1 to 100 ⁇ m. When used as a photoelectrochemical cell, the thickness is preferably 1 to 50 ⁇ m, more preferably 3 to 30 ⁇ m.
- the semiconductor fine particles may be heated at a temperature of 100 to 800 ° C. for 10 minutes to 10 hours in order to adhere the particles to each other after being applied to the support. When glass is used as the support, the film forming temperature is preferably 400 to 600 ° C.
- the film forming method may be any one of (1) a wet method, (2) a dry method, and (3) an electrophoresis method (including an electrodeposition method), preferably (1) a wet method, or ( 2) A dry method, more preferably (1) a wet method.
- the coating amount of semiconductor fine particles per 1 m 2 of support is preferably 0.5 to 500 g, more preferably 5 to 100 g.
- the well-dried semiconductor fine particles are immersed in a dye adsorbing dye solution comprising the solution and the dye of the present invention for a long time.
- the solution used for the dye solution for dye adsorption can be used without particular limitation as long as it is a solution that can dissolve the dye of the present invention.
- ethanol, methanol, isopropanol, toluene, t-butanol, acetonitrile, acetone, n-butanol and the like can be used.
- ethanol and toluene can be preferably used.
- the dye solution for dye adsorption comprising the solution and the dye of the present invention may be heated to 50 ° C. to 100 ° C. as necessary.
- the adsorption of the dye may be performed before or after application of the semiconductor fine particles. Further, the semiconductor fine particles and the dye may be applied and adsorbed simultaneously. Unadsorbed dye is removed by washing.
- When baking a coating film it is preferable to adsorb
- the dye to be adsorbed may be one kind of the dye A1 described above, or may be further mixed with the dye A2 or may be mixed with another dye. The dye to be mixed is selected so as to make the wavelength range of photoelectric conversion as wide as possible. When mixing the dyes, it is preferable to prepare a dye solution for dye adsorption by dissolving all the dyes.
- the total amount of the dye used is preferably 0.01 to 100 mmol, more preferably 0.1 to 50 mmol, and particularly preferably 0.1 to 10 mmol per 1 m 2 of the support. In this case, the amount of the dye of the present invention is preferably 5 mol% or more.
- the adsorption amount of the dye to the semiconductor fine particles is preferably 0.001 to 1 mmol, more preferably 0.1 to 0.5 mmol, with respect to 1 g of the semiconductor fine particles.
- a sensitizing effect in a semiconductor can be sufficiently obtained.
- the amount of the dye is small, the sensitizing effect is insufficient, and when the amount of the dye is too large, the dye not attached to the semiconductor floats and causes the sensitizing effect to be reduced.
- a colorless compound may be co-adsorbed for the purpose of reducing the interaction between the dyes such as association.
- hydrophobic compound to be co-adsorbed include steroid compounds having a carboxyl group (for example, cholic acid and pivalic acid).
- the surface of the semiconductor fine particles may be treated with amines.
- Preferred amines include 4-tert-butylpyridine, polyvinylpyridine and the like. These may be used as they are in the case of a liquid, or may be used by dissolving in an organic solvent.
- the counter electrode serves as the positive electrode of the photoelectrochemical cell.
- the counter electrode is usually synonymous with the conductive support described above, but the support is not necessarily required in a configuration in which the strength is sufficiently maintained. However, having a support is advantageous in terms of hermeticity.
- the material for the counter electrode include platinum, carbon, conductive polymer, and the like. Preferable examples include platinum, carbon, and conductive polymer.
- a structure having a high current collecting effect is preferable.
- Preferred examples include JP-A-10-505192.
- a composite electrode such as titanium oxide and tin oxide (TiO 2 / SnO 2 ) may be used.
- TiO 2 / SnO 2 titanium oxide and tin oxide
- a mixed electrode of titania for example, Japanese Patent Application Laid-Open No. 2000-11913 is cited. Examples of mixed electrodes other than titania include Japanese Patent Application Laid-Open Nos. 2001-185243 and 2003-282164.
- the structure of the element may have a structure in which a first electrode layer, a first photoelectric conversion layer, a conductive layer, a second photoelectric conversion layer, and a second electrode layer are sequentially stacked.
- the dyes used for the first photoelectric conversion layer and the second photoelectric conversion layer may be the same or different, and when they are different, it is preferable that the absorption spectra are different.
- the light receiving electrode may be a tandem type in order to increase the utilization rate of incident light.
- Examples of preferred tandem type configurations include those described in JP-A Nos. 2000-90989 and 2002-90989.
- a light management function for efficiently scattering and reflecting light inside the light receiving electrode layer may be provided.
- Preferable examples include those described in JP-A-2002-93476.
- a short-circuit prevention layer between the conductive support and the porous semiconductor fine particle layer in order to prevent reverse current due to direct contact between the electrolyte and the electrode.
- Preferable examples include Japanese Patent Application Laid-Open No. 06-507999.
- a spacer or a separator In order to prevent contact between the light receiving electrode and the counter electrode, it is preferable to use a spacer or a separator.
- a preferable example is JP-A-2001-283941.
- Cell and module sealing methods include polyisobutylene thermosetting resin, novolak resin, photo-curing (meth) acrylate resin, epoxy resin, ionomer resin, glass frit, method using aluminum alkoxide for alumina, low melting point glass paste It is preferable to use a laser melting method. When glass frit is used, powder glass mixed with acrylic resin as a binder may be used.
- YA-4 and YA-9 are shown. 1.
- Preparation of YA-4 YA-4a, YA-4b, YA-4c and YA-4d were sequentially prepared to obtain YA-4.
- tin oxide doped with fluorine was formed as a transparent conductive film by sputtering, and this was scribed with a laser to divide the transparent conductive film into two parts.
- anatase-type titanium oxide (P-25 (trade name) manufactured by Nippon Aerosil Co., Ltd.) is mixed with 100 ml of a mixed solvent having a volume ratio of 4: 1 of water and acetonitrile, and a mixing conditioner of both rotation and revolution is used.
- the resulting mixture was uniformly dispersed and mixed to obtain a semiconductor fine particle dispersion.
- This dispersion was applied to a transparent conductive film and heated at 500 ° C. to produce a light receiving electrode.
- a dispersion containing 40:60 (mass ratio) of silica particles and rutile-type titanium oxide is prepared, and this dispersion is applied to the light receiving electrode and heated at 500 ° C. to form an insulating porous material. Formed body. Next, a carbon electrode was formed as a counter electrode.
- an ethanol solution (1 ⁇ 10 ⁇ 4 mol / L) of a metal complex dye described in Table 1 below was prepared.
- ⁇ when dissolved at 0.5 mM or more ⁇ when dissolved at 0.35 mM to less than 0.5 mM, ⁇ , 0 when dissolved at 0.20 mM to less than 0.35 mM
- x when dissolved at 0.20 mM to less than 0.35 mM
- the case of less than 2 mM was evaluated as “x”, and the cases other than “x” were determined as acceptable solubility.
- the glass substrate on which the insulating porous body was formed was immersed in an ethanol solution of these metal complex dyes for 48 hours.
- the dyed glass was immersed in a 10% ethanol solution of 4-tert-butylpyridine for 30 minutes, then washed with ethanol and naturally dried.
- the thickness of the photosensitive layer thus obtained was 10 ⁇ m, and the coating amount of semiconductor fine particles was 20 g / m 2 .
- As the electrolytic solution a methoxypropionitrile solution of dimethylpropylimidazolium iodide (0.5 mol / L) and iodine (0.1 mol / L) was used.
- Example 1-2 As shown in Table 2, photoelectric conversion was performed in the same manner as in Experiment 1-1, except that two types of dyes were prepared for each sample and a dye solution dissolved in ethanol at the concentrations shown in Table 2 was used. An element was produced and the photoelectric conversion efficiency was measured. Conversion efficiency of 7.0% or more is ⁇ , 6.0% or more and less than 7.0% is ⁇ , 5.0% or more and less than 6.0% is ⁇ , and less than 6.5% Was evaluated as x, and a photoelectric conversion efficiency of 6.0% or more was regarded as acceptable.
- Example 2 An ITO film was produced on a glass substrate, and an FTO film was laminated thereon to produce a transparent conductive film. Then, a transparent electrode plate was obtained by forming an oxide semiconductor porous film on the transparent conductive film. And the photoelectrochemical cell was produced using the transparent electrode plate, and conversion efficiency was measured.
- the method is as follows (1) to (5). (1) Preparation of raw material compound solution for ITO (indium / tin / oxide) film Indium (III) tetrahydrate 5.58 g and tin (II) chloride dihydrate 0.23 g were dissolved in 100 ml of ethanol. Thus, a raw material compound solution for ITO film was obtained.
- the raw material compound solution for ITO film obtained in (1) was adjusted from a nozzle having a diameter of 0.3 mm to a pressure of 0.06 MPa and a distance to the glass plate of 400 mm, 25 Sprayed for a minute.
- a photoelectrochemical cell having the structure shown in FIG. 2 of Japanese Patent No. 4260494 was produced using the above three types of transparent electrode plates.
- the oxide semiconductor porous film is formed by dispersing titanium oxide fine particles having an average particle diameter of about 230 nm in acetonitrile to form a paste, applying the paste to the transparent electrode 11 by a bar coating method to a thickness of 15 ⁇ m, and drying to 450 ° C. And baked for 1 hour. Thereafter, dyes having concentrations shown in Table 3 were supported on the porous oxide semiconductor membrane. In the case of sample numbers 2-13 to 2-21, two types of dyes were mixed in an ethanol solvent to obtain the dye concentrations shown in Table 3.
- a conductive substrate in which an ITO film and an FTO film were laminated on a glass plate was used for the counter electrode, and an electrolytic solution made of a non-aqueous solution of iodine / iodide was used for the electrolyte layer.
- the planar dimensions of the photoelectrochemical cell were 25 mm long and 25 mm wide.
- the durability of conversion efficiency after 90 hours with respect to the initial value of conversion efficiency is 90% or more A, 85% to less than 90% B, 80% to less than 85% C, 70 % And less than 80% are evaluated as D, and those less than 70% are evaluated as E.
- the conversion efficiency after 700 hours is 70% or more with respect to the initial value of conversion efficiency. It was rejected.
- test cell (i) The surface of a heat-resistant glass plate having a length of 100 mm, a width of 100 mm, and a thickness of 2 mm was chemically washed and dried.
- this glass plate was placed in a reactor, heated with a heater, and then FTO (fluorine used in Experiment 2 above)
- FTO fluorine used in Experiment 2 above
- the raw material compound solution for the dope tin oxide film was sprayed for 25 minutes from a nozzle having a diameter of 0.3 mm at a pressure of 0.06 MPa and a distance to the glass plate of 400 mm to prepare a glass substrate with an FTO film.
- grooves having a depth of 5 ⁇ m were formed in a lattice circuit pattern by an etching method. After pattern formation by photolithography, etching was performed using hydrofluoric acid. A metal conductive layer (seed layer) was formed by sputtering to enable plating formation, and a metal wiring layer was further formed by additive plating. The metal wiring layer was formed in a convex lens shape from the transparent substrate surface to a height of 3 ⁇ m. The circuit width was 60 ⁇ m. From this, an FTO film having a thickness of 400 nm was formed as the shielding layer 5 by the SPD method to obtain an electrode substrate (i). The cross-sectional shape of the electrode substrate (i) was as shown in FIG. 2 in JP-A No. 2004-146425.
- a titanium oxide dispersion having an average particle size of 25 nm was applied and dried on the electrode substrate (i), and heated and sintered at 450 ° C. for 1 hour. This was immersed in an ethanol solution of the dye shown in Table 3 for 40 minutes to carry the dye.
- preliminary studies were conducted on the solubility of the dye used in the present invention in various organic solvents. As a result, it was found that it could be dissolved in toluene. Therefore, as shown in Table 3, a solution infiltrated and supported in a toluene solution for 40 minutes was also prepared.
- the platinum sputtered FTO substrate and the substrate were placed facing each other through a thermoplastic polyolefin resin sheet having a thickness of 50 ⁇ m, and the bipolar plate was fixed by thermally melting the resin sheet portion.
- a methoxyacetonitrile solution containing 0.5M iodide and 0.05M iodine as the main components was injected from the electrolyte solution inlet previously opened on the platinum sputter electrode side, and filled between the electrodes. It was. Furthermore, the peripheral part and the electrolyte solution injection port were sealed with an epoxy-based sealing resin, and a silver paste was applied to the current collecting terminal part to obtain a test cell (i).
- the test cell (i) was irradiated with AM1.5 artificial sunlight in the same manner as in Experiment 1, and the conversion efficiency was measured. The results are shown in Table 4.
- Test cell (iv) A glass substrate with an FTO film having a length of 100 mm and a width of 100 mm was prepared in the same manner as in the test cell (i).
- a metal wiring layer (gold circuit) was formed by additive plating.
- the metal wiring layer (gold circuit) was formed in a lattice shape on the substrate surface, and had a circuit width of 50 ⁇ m and a circuit thickness of 5 ⁇ m.
- an FTO film having a thickness of 300 nm was formed as a shielding layer by the SPD method to obtain an electrode substrate (iv).
- a conversion efficiency of 4.0% or more is A, 3.5% or more and less than 4.0% B, 3.0% or more and less than 3.5% C, 2.5% or more 3. Display less than 0% as D, 2.0% or more and less than 3% as E, less than 2.0% as F, conversion efficiency D or higher as pass, E or F It was rejected.
- the conversion efficiency after 700 hours with respect to the initial value of the conversion efficiency is 90% or more A, 85% or more and less than 90% B, 80% or more and less than 85% C, 70% or more 80 Less than 70% is evaluated as D, and less than 70% is evaluated as E, and the conversion efficiency after 700 hours with respect to the initial value of conversion efficiency is 70% or more (A to D) is passed, and less than 70% Things (E) were rejected.
- the metal complex dye of the present invention has high solubility in a solvent. For this reason, by selecting an optimal solvent, a dye solution having excellent adsorptivity to porous semiconductor fine particles can be prepared, and a photoelectrochemical cell excellent in conversion efficiency and durability can be provided. . In addition, even when the metal complex dye represented by the general formula (1) is used in combination with the dye represented by the general formula (13), the solubility in the solvent is not impaired and the photoelectric conversion efficiency of the acceptable level is exhibited. It was.
- the obtained titania colloidal particles (a2) was concentrated to 10 wt%, the peroxotitanic acid solution were mixed, the titanium of the mixed solution TiO 2 terms, TiO 2 mass of 30 mass% Then, hydroxypropylcellulose was added as a film forming aid so as to prepare a coating solution (a1) for forming a semiconductor film.
- the coating liquid (a1) is applied on a transparent glass substrate on which fluorine-doped tin oxide is formed as an electrode layer, air-dried, and then a low-pressure mercury lamp is used. It was used to irradiate ultraviolet rays of 6000 mJ / cm 2 to decompose the peroxo acid and harden the coating film. The coating film was heated at 300 ° C. for 30 minutes to decompose and anneal the hydroxypropyl cellulose to form an oxide semiconductor film (a3) on the glass substrate.
- Photoelectrochemical cell (b) The oxide semiconductor film (a3) except that after irradiation with ultraviolet rays decomposes the peroxo acid and cures the film, Ar gas ion irradiation (Nisshin Electric: ion implantation apparatus, irradiation at 200 eV for 10 hours) is performed. ), An oxide semiconductor film (b3) was formed. Similar to the oxide semiconductor film (a), the dye was adsorbed on the oxide semiconductor film (b3). Thereafter, a photoelectrochemical cell (b) was prepared in the same manner as in Example 1, and ⁇ was measured.
- an oxide semiconductor film (c3) is formed in the same manner as the oxide semiconductor film (a3) using the peroxotitanic acid solution obtained above and titania colloidal particles (c1), and the metal oxide semiconductor film
- the dye of the present invention was adsorbed as a spectral sensitizing dye.
- a photoelectrochemical cell (c) was produced in the same manner as the photoelectrochemical cell (a), and ⁇ was measured.
- titania colloidal particles (d1) are concentrated to 10% by mass, and hydroxypropylcellulose is added as a film forming aid so as to be 30% by mass in terms of TiO 2 to form a semiconductor film.
- a coating solution was prepared.
- the coating solution is applied onto a transparent glass substrate on which fluorine-doped tin oxide is formed as an electrode layer, dried naturally, and subsequently irradiated with 6000 mJ / cm 2 of ultraviolet rays using a low-pressure mercury lamp to form a film. Cured. Furthermore, it heated at 300 degreeC for 30 minute (s), the hydroxypropyl cellulose was decomposed
- the dye of the present invention was adsorbed as a spectral sensitizing dye in the same manner as the oxide semiconductor film (a3). Then, the photoelectrochemical cell (d) was produced by the same method as the photoelectrochemical cell (a).
- the conversion efficiency after 700 hours with respect to the initial value of the conversion efficiency is 90% or more A, 85% or more and less than 90% B, 80% or more and less than 85% C, 70% or more 80 Less than 70% is evaluated as D, and less than 70% is evaluated as E.
- the conversion efficiency after 700 hours with respect to the initial value of conversion efficiency is 70% or more, and the one with less than 70% is rejected. did.
- Titanium oxide was prepared by changing the method, an oxide semiconductor film was prepared from the obtained titanium oxide, and a photoelectrochemical cell was evaluated.
- (1) Preparation of titanium oxide by heat treatment method (titanium oxide 1 (blue kite type) etc.) Using a commercially available anatase-type titanium oxide (trade name ST-01, manufactured by Ishihara Sangyo Co., Ltd.), this is heated to about 900 ° C. to be converted into a brookite-type titanium oxide, and further heated to about 1,200 ° C.
- Rutile type titanium oxide was used.
- comparative titanium oxide 1 (anatase type), titanium oxide 1 (blue kite type), and comparative titanium oxide 2 (rutile type) are used.
- the titanium tetrachloride concentration was 0.25 mol / liter (2% by mass in terms of titanium oxide).
- the reaction solution started to become cloudy immediately after dropping, but kept at the same temperature. After the dropping was completed, the temperature was further raised and heated to the vicinity of the boiling point (104 ° C.). The reaction was terminated.
- the sol obtained by the reaction was filtered, and then powdered using a vacuum dryer at 60 ° C.
- the ratio (peak intensity at the position where the three lines overlap) was 0.05.
- the titanium oxide was crystallinity of about 70.0% by mass for the brookite type, about 1.2% by mass for the rutile type, and about 28.8% by mass for the anatase type.
- the average particle diameter of the primary particles was 0.015 ⁇ m.
- Ti content 28% by mass, specific gravity 1.5, purity 99.9%
- distilled water 500 ml of this solution was put into a reaction tank equipped with a reflux condenser, and ozone gas with a purity of 80% was bubbled from the ozone gas generator at 1 L / min while heating at 85 ° C. to carry out an oxidation reaction. This state was maintained for 2 hours to complete the reaction.
- the obtained sol was filtered and vacuum-dried to obtain a powder.
- the ratio of (peak intensity on the surface of blue kite type 121) / (peak intensity at the position where the three overlap) is 0.85, (rutile main peak intensity) /
- the ratio (peak intensity at the position where the three lines overlap) was 0.
- the titanium dioxide was about 98% by mass for the blue kite type, 0% by mass for the rutile type, 0% by mass for the anatase type, and about 2% was amorphous.
- the average particle diameter of the primary particles was 0.05 ⁇ m.
- a photoelectrochemical cell using the photoelectric conversion element having the structure shown in FIG. 1 described in JP-A No. 2000-340269 using the titanium oxides 1 to 3 prepared by the above method as a semiconductor was produced by the following method.
- a glass substrate was coated with fluorine-doped tin oxide to form a conductive transparent electrode.
- a paste using each titanium oxide particle as a raw material was formed on the electrode surface, applied to a thickness of 50 ⁇ m by a bar coating method, and then baked at 500 ° C. to form a thin layer having a thickness of about 20 ⁇ m.
- concentration of following Table 6 was prepared, the glass substrate in which the thin layer of the said titanium oxide was formed in this was immersed, and it hold
- a photoelectric conversion element having the structure shown in FIG. 1 of JP-A No. 2000-340269 was produced using tetrapropylammonium iodide salt and lithium iodide in acetonitrile as an electrolyte and using platinum as a counter electrode. For photoelectric conversion, light from a 160 W high-pressure mercury lamp (the infrared part was cut by a filter) was applied to the above-described element, and conversion efficiency was measured in the same manner as in Experiment 1. The results are shown in Table 6.
- Conversion efficiency of 6.0% or more is A, 5% or more and less than 6% B, 4% or more and less than 5% C, 3% or more and less than 4% D, 1.5% Those with less than 3% are displayed as E, those with less than 1.5% are displayed as F, those with a conversion efficiency of D or more are accepted, and those with less than D are rejected. Further, the conversion efficiency after 700 hours with respect to the initial value of the conversion efficiency is 90% or more A, 85% or more and less than 90% B, 80% or more and less than 85% C, 70% or more 80 Less than 70% is evaluated as D, and less than 70% is evaluated as E. The conversion efficiency after 700 hours with respect to the initial value of conversion efficiency is 70% or more, and the one with less than 70% is rejected. did.
- the metal complex dye of the present invention is excellent in solubility in a solvent, a high concentration dye solution can be prepared. For this reason, the dye solution excellent in the adsorptivity to titanium oxide can be prepared, and the photoelectrochemical cell excellent in especially durability can be provided. Moreover, even when the pigment
- a paste in which semiconductor fine particles were dispersed was prepared using titanium oxides having different particle sizes. Using this, a photoelectrochemical cell was produced and its characteristics were evaluated.
- paste A titania slurry was prepared by placing spherical TiO 2 particles (anatase type, average particle size: 25 nm, hereinafter referred to as spherical TiO 2 particles 1) in a nitric acid solution and stirring. Next, a cellulose binder as a thickener was added to the titania slurry and kneaded to prepare a paste.
- the paste 1, a rod-shaped TiO 2 particles 1 were mixed, the mass rod-shaped TiO 2 particles 1: Paste 1 Mass 30: 70 paste was prepared.
- a paste was prepared.
- a paste was prepared.
- a photoelectrode having the same configuration as that of the photoelectrode 12 shown in FIG. 5 of JP-A-2002-289274 is prepared by the following procedure, and further, the photoelectrode is used and dye sensitization is performed except for the photoelectrode.
- a 10 ⁇ 10 mm scale photoelectrochemical cell 1 having the same configuration as the solar cell 20 was produced.
- a transparent electrode in which a fluorine-doped SnO 2 conductive film (film thickness: 500 nm) was formed on a glass substrate was prepared. On the SnO 2 conductive film, the paste 2 was screen-printed and then dried. Then, it baked on the conditions of 450 degreeC in the air.
- the semiconductor electrodes (area of the light receiving surface of the same structure as the semiconductor electrode 2 shown in FIG. 5 of Patent Document on SnO 2 conductive film; 10 mm ⁇ 10 mm, layer thickness: 10 ⁇ m, semiconductor layer thickness: 6 ⁇ m, light scattering layer thickness: 4 ⁇ m, content of rod-like TiO 2 particles 1 contained in the light scattering layer; 30% by mass) for sensitization
- a photoelectrode containing no dye was prepared.
- dye was made to adsorb
- a platinum electrode thinness of Pt thin film; 100 nm
- an iodine redox solution containing iodine and lithium iodide as an electrolyte E were prepared.
- a DuPont spacer S (trade name: “Surlin”) having a shape corresponding to the size of the semiconductor electrode was prepared.
- FIG. 3 of Japanese Patent Application Laid-Open No. 2002-289274 the photoelectrode 10 and The counter electrode CE and the spacer S were opposed to each other, and the above electrolyte was filled therein to complete the photoelectrochemical cell 1.
- the photoelectrode 10 shown in FIG. 1 described in JP-A-2002-289274 was prepared by the same procedure as that of the photoelectrochemical cell 1 except that the semiconductor electrode was manufactured as follows.
- a photoelectrochemical cell 2 having the same configuration as that of the dye-sensitized solar cell 20 shown in FIG. Paste 2 was used as a semiconductor layer forming paste.
- paste 2 was screen-printed on the SnO 2 conductive film and then dried. Then, it baked on the conditions of 450 degreeC in the air, and formed the semiconductor layer.
- Paste 3 was used as the innermost layer forming paste of the light scattering layer.
- the paste 5 was used as the outermost layer forming paste of the light scattering layer.
- a light scattering layer was formed on the semiconductor layer in the same manner as in the photoelectrochemical cell 1. Then, on the SnO 2 conductive film, a semiconductor electrode having the same configuration as the semiconductor electrode 2 shown in FIG. 1 described in Japanese Patent Application Laid-Open No.
- Photoelectrochemical cell 3 According to the same procedure as that of the photoelectrochemical cell 1 except that the paste 1 was used as a semiconductor layer forming paste and the paste 4 was used as a light scattering layer forming paste in the production of a semiconductor electrode. 5 was produced, and a photoelectrochemical cell 3 having the same configuration as the photoelectrochemical cell 20 shown in FIG. 3 described in JP-A-2002-289274 was produced.
- the semiconductor electrode has a light receiving surface area of 10 mm ⁇ 10 mm, a layer thickness of 10 ⁇ m, a semiconductor layer thickness of 5 ⁇ m, a light scattering layer thickness of 5 ⁇ m, and the rod-like TiO 2 particles 1 contained in the light scattering layer. Content rate: 30% by mass.
- Photoelectrochemical cell 4 In the production of the semiconductor electrode, the light shown in FIG. 5 was obtained by the same procedure as that of the photoelectrochemical cell 1 except that the paste 2 was used as the semiconductor layer forming paste and the paste 6 was used as the light scattering layer forming paste. A photoelectrode and photoelectrochemical cell 4 having the same configuration as the electrode 10 and the photoelectrochemical cell 20 shown in FIG. 3 described in JP-A-2002-289274 were produced.
- the semiconductor electrode has a light receiving surface area: 10 mm ⁇ 10 mm, layer thickness: 10 ⁇ m, semiconductor layer thickness: 6.5 ⁇ m, light scattering layer thickness: 3.5 ⁇ m, plate-like contained in the light scattering layer
- the content of mica particles 1 was 20% by mass.
- the photoelectrochemical cell 5 was prepared by the same procedure as that of the photoelectrochemical cell 1 except that the paste 2 was used as the semiconductor layer forming paste and the paste 8 was used as the light scattering layer forming paste. Produced.
- the photoelectrochemical cell 6 was prepared by the same procedure as that of the photoelectrochemical cell 1 except that the paste 2 was used as the semiconductor layer forming paste and the paste 9 was used as the light scattering layer forming paste. Produced.
- the photoelectrochemical cell 7 was prepared by the same procedure as that of the photoelectrochemical cell 1 except that the paste 2 was used as the semiconductor layer forming paste and the paste 10 was used as the light scattering layer forming paste. Produced.
- the photoelectrochemical cell 8 was prepared by the same procedure as the photoelectrochemical cell 1 except that the paste 2 was used as the semiconductor layer forming paste and the paste 11 was used as the light scattering layer forming paste. Produced.
- the photoelectrochemical cell 9 was prepared in the same procedure as the photoelectrochemical cell 1 except that the paste 2 was used as the semiconductor layer forming paste and the paste 13 was used as the light scattering layer forming paste. Produced.
- the photoelectrochemical cell 10 was prepared by the same procedure as that of the photoelectrochemical cell 1 except that the paste 2 was used as the semiconductor layer forming paste and the paste 14 was used as the light scattering layer forming paste. Produced.
- the content of the rod-like TiO 2 particles 9 contained in the light scattering layer of the semiconductor electrode was 30% by mass.
- Photoelectrochemical cell 11 Similar to the photoelectrochemical cell 1 except that a semiconductor electrode (light-receiving surface area: 10 mm ⁇ 10 mm, layer thickness: 10 ⁇ m) made of only the semiconductor layer using only the paste 2 was manufactured in the manufacture of the semiconductor electrode.
- the photoelectrochemical cell 11 was produced according to the procedure.
- Electrochemical battery 12 In the production of the semiconductor electrode, the photoelectrode and the comparative photoelectricity were prepared in the same procedure as in the photoelectrochemical cell 1 except that the paste 2 was used as the semiconductor layer forming paste and the paste 7 was used as the light scattering layer forming paste. A chemical battery 12 was produced. The content ratio of the rod-shaped TiO 2 particles 2 contained in the light scattering layer of the semiconductor electrode; was 30 wt%.
- the photoelectrochemical cells 1 to 12 were irradiated with 1000 W / m 2 of pseudo-sunlight from a xenon lamp through an AM1.5 filter using a solar simulator (manufactured by WACOM, WXS-85H (trade name)).
- the current-voltage characteristics were measured using an IV tester to determine the conversion efficiency. The results are shown in Table 7.
- Conversion efficiency of 6.0% or more is A, 5% or more and less than 6% B, 4% or more and less than 5% C, 3% or more and less than 4% D, 1.5% Those with less than 3% are displayed as E, those with less than 1.5% are displayed as F, those with a conversion efficiency of D or more are accepted, and those with less than D are rejected. Further, the conversion efficiency after 700 hours with respect to the initial value of the conversion efficiency is 90% or more A, 85% or more and less than 90% B, 80% or more and less than 85% C, 70% or more 80 Less than 70% is evaluated as D, and less than 70% is evaluated as E. The conversion efficiency after 700 hours with respect to the initial value of conversion efficiency is 70% or more, and the one with less than 70% is rejected. did.
- the photoelectrochemical cell using the metal complex dye of the present invention has particularly high conversion efficiency and exhibits acceptable characteristics. Further, it was found that even when the metal complex dye represented by the general formula (1) was used in combination with the dye represented by the general formula (13), the initial value and durability of the conversion efficiency were acceptable levels.
- Example 7 A slurry obtained by adding metal alkoxide to metal oxide fine particles was applied to a conductive substrate, and then UV ozone irradiation, UV irradiation or drying was performed to produce an electrode. Then, the photoelectrochemical cell was produced and the conversion efficiency was measured.
- Titanium oxide was used as the metal oxide fine particles.
- P25 powder (trade name, manufactured by Degussa) having a mass ratio of 30% rutile type and 70% anatase type and an average particle size of 25 nm was used.
- metal oxide fine particle powder Pretreatment of metal oxide fine particle powder
- the metal oxide fine particles were previously heat-treated to remove surface organic substances and moisture.
- the fine particles were heated in an oven at 450 ° C. in the atmosphere for 30 minutes.
- the metal alkoxide that plays a role in bonding metal oxide fine particles includes titanium (IV) tetraisopropoxide (TTIP) as a titanium raw material, zirconium (IV) tetra n-propoxide as a zirconium raw material, and niobium as a niobium raw material.
- TTIP titanium
- IV tetraisopropoxide
- V Pentaethoxide (all manufactured by Aldrich) was used.
- the molar concentration ratio between the metal oxide fine particles and the metal alkoxide is appropriately adjusted according to the metal oxide fine particle diameter so that the amorphous layer generated by hydrolysis of the metal alkoxide is not excessively thick and the particles can be sufficiently bonded to each other. did. All metal alkoxides were 0.1M ethanol solutions. When mixing titanium oxide fine particles and titanium (IV) tetraisopropoxide (TTIP), 3.55 g of a 0.1 M TTIP solution was mixed with 1 g of titanium oxide fine particles. At this time, the titanium oxide concentration in the obtained paste was about 22% by mass, and the viscosity was appropriate for coating. Moreover, the titanium oxide, TTIP, and ethanol at this time were 1: 0.127: 3.42 by mass ratio, and 1: 0.036: 5.92 by molar ratio.
- TTIP titanium (IV) tetraisopropoxide
- a mixed paste of titanium oxide fine particles and alkoxide other than TTIP was prepared so that the fine particle concentration was 22% by mass.
- the content was 16% by mass.
- the metal alkoxide solution was mixed at a ratio of 5.25 g to 1 g of the metal oxide fine particles.
- the metal oxide fine particles and the metal alkoxide solution were stirred for 2 hours with a magnetic stirrer in a sealed container to obtain a uniform paste.
- a doctor blade method, a screen printing method, a spray coating method, or the like can be used, and an appropriate paste viscosity is appropriately selected depending on the application method.
- a method of applying simply with a glass rod similar to the doctor blade method was used.
- the concentration of the metal oxide fine particles giving an appropriate paste viscosity was approximately in the range of 5 to 30% by mass.
- the thickness of the amorphous metal oxide formed by the decomposition of the metal alkoxide was in the range of about 0.1 to 0.6 nm in this experiment, and the thickness could be in an appropriate range.
- UV ozone treatment For UV ozone treatment, NL-UV253 UV ozone cleaner manufactured by Nippon Laser Electronics was used. The UV light source was equipped with three 4.5 W mercury lamps having emission lines at 185 nm and 254 nm, and the sample was placed horizontally at a distance of about 6.5 cm from the light source. Ozone is generated by introducing an oxygen stream into the chamber. In this example, this UV ozone treatment was performed for 2 hours. Note that no decrease in the conductivity of the ITO film and the FTO film due to this UV ozone treatment was observed.
- UV treatment Similarly to the UV ozone treatment, the treatment was performed for 2 hours, except that the inside of the chamber was replaced with nitrogen. No decrease in the conductivity of the ITO film and FTO film due to the UV treatment was observed.
- a photoelectrochemical cell was fabricated by using a conductive substrate on which a porous film after dye adsorption was formed as a photoelectrode, and an ITO / PET film or FTO / glass counter electrode in which platinum fine particles were modified by sputtering.
- the effective area of the photoelectrode was about 0.2 cm 2 .
- 3-methoxypropionitrile containing 0.5 M LiI, 0.05 M I 2 and 0.5 M t-butylpyridine was introduced into the gap between both electrodes by capillary action.
- the battery performance was evaluated by measuring the photocurrent action spectrum under irradiation with a constant number of photons (1016 cm ⁇ 2 ) and IV measurement under irradiation with AM1.5 simulated sunlight (100 mW / cm 2 ).
- a CEP-2000 type spectral sensitivity measuring device manufactured by Spectrometer Co., Ltd. was used for these measurements. Table 8 shows the obtained conversion efficiency.
- Conversion efficiency of 4.0% or more is A, 4.0% or more and less than 3.5% is B, 3.0% or more and less than 3.5% is C, 2.5% or more. Less than 0% is displayed as D, 2.0% or more and less than 2.5% is displayed as E, and less than 2.0% is displayed as F. Was rejected. Further, the conversion efficiency after 90 hours with respect to the initial value of conversion efficiency is 90% or more, A is 85% or more and less than 90%, B is 80% or more and less than 85%, C is 70% or more and 80 Less than 70% is evaluated as D, less than 70% is evaluated as E, the conversion efficiency after 300 hours is 70% or more with respect to the initial value of the conversion efficiency, and less than 70% is rejected. did.
- the column of “ pretreatment of titanium oxide” in Table 8 indicates the presence or absence of pretreatment of titanium oxide fine particles (heat treatment in an oven at 450 ° C. for 30 minutes).
- the photoelectrochemical cell using the dye of the present invention after the formation of the porous film and before the sensitizing dye adsorption, regardless of the presence or absence of UV ozone treatment, UV irradiation treatment, drying treatment, It was found that the conversion efficiency of the photoelectrochemical cell is high, and a conversion efficiency at a pass level can be obtained. Further, the conversion efficiency after 300 hours showed excellent characteristics.
- a conductive film was formed on a glass substrate by sputtering tin oxide doped with fluorine as a transparent conductive film.
- Dispersion containing anatase-type titanium oxide particles on this conductive film (anatase-type titanium oxide (P-25 (trade name) manufactured by Nippon Aerosil Co., Ltd.) in 100 mL of a mixed solvent having a volume ratio of water to acetonitrile of 4: 1).
- 32 g of the mixture and using a rotating / revolving mixing conditioner, uniformly dispersed and mixed to obtain a semiconductor fine particle dispersion), and then sintered at 500 ° C. to form a photosensitive layer having a thickness of 15 ⁇ m. Formed. In this photosensitive layer, no.
- the open circuit voltage is 7.0 V or more, ⁇ , 6.5 V or more and less than 7.0 V, ⁇ , 6.0 V or more and less than 6.5 V, ⁇ , or less than 6.0 V ⁇ It was displayed as 6.5V or more as the pass.
- a having a conversion efficiency of 6.0% or more is A, 5% or more and less than 6% is B, 4% or more and less than 5% is C, 3% or more and less than 4% is D, 1 .5% or more and less than 3% was indicated as E, and less than 1.5% was indicated as F, conversion efficiency D or more was passed, and less than D was rejected.
- the conversion efficiency after 700 hours with respect to the initial value of the conversion efficiency is 90% or more A, 85% or more and less than 90% B, 80% or more and less than 85% C, 70% or more 80 Less than 70% is evaluated as D, and less than 70% is evaluated as E.
- the conversion efficiency after 700 hours with respect to the initial value of conversion efficiency is 70% or more, and the one with less than 70% is rejected. did.
- the initial value of the open circuit voltage and the conversion efficiency are both acceptable levels, and the conversion efficiency after the elapse of 700 hours is the initial value of 80. % Or more, excellent durability. Further, it was found that even when the metal complex dye represented by the general formula (1) was used in combination with the dye represented by the general formula (13), the initial value and durability of the conversion efficiency were acceptable levels.
- slurry 1 a slurry for forming a second layer
- the slurry for forming the first layer (P1 content: 15 mass%; hereinafter, “slurry” was prepared by the same preparation procedure as that of the slurry 1 except that only P25 was used without using P200. 2)) was prepared.
- a transparent electrode (thickness: 1.1 mm) in which a fluorine-doped SnO 2 conductive film (film thickness: 700 nm) was formed on a glass substrate (transparent conductive glass) was prepared. Then, the SnO 2 conductive film, the slurry 2 described above was coated with Bakoda, then dried. Then, it baked for 30 minutes at 450 degreeC in air
- the second layer was formed on the first layer by repeating the same application and firing as described above using the slurry 1.
- the semiconductor electrode 2 (light-receiving surface area; 1.0 cm 2 , the total thickness of the first layer and the second layer: 10 ⁇ m (the thickness of the first layer: 3 ⁇ m, the first layer) on the SnO 2 conductive film No. 2 layer thickness: 7 ⁇ m)
- a photoelectrode 10 containing no sensitizing dye was prepared.
- a counter electrode CE having the same shape and size as the above photoelectrode was produced.
- an isopropanol solution of chloroplatinic acid hexahydrate was dropped on a transparent conductive glass, dried in air, and then baked at 450 ° C. for 30 minutes to obtain a platinum sintered counter electrode CE.
- the counter electrode CE was previously provided with a hole for injection of the electrolyte E (diameter 1 mm).
- a spacer S (trade name: “HIMILAN”, ethylene / methacrylic acid random copolymer ionomer film) manufactured by Mitsui Dupont Polychemical Co., Ltd. having a shape matched to the size of the semiconductor electrode was prepared.
- the photoelectrode and the counter electrode were opposed to each other via a spacer, and each was bonded by thermal welding to obtain a battery casing (no electrolyte filled).
- the hole is closed with a member made of the same material as the spacer, and this member is thermally welded to the hole of the counter electrode to seal the hole. 1 was completed.
- Photoelectrochemical cell 2 The photoelectrochemical cell 2 was produced in the same procedure and conditions as the photoelectrochemical cell 1 except that the concentration of zinc iodide in the liquid electrolyte was 50 mmol / L.
- Photoelectrochemical cell 3 Comparative photoelectrochemistry was performed in the same procedure and conditions as in the photoelectrochemical cell 1 except that lithium iodide was added instead of zinc iodide in the liquid electrolyte, and the concentration of lithium iodide in the liquid electrolyte was 20 mmol / L. Battery 1 was produced.
- Comparative electrochemical cell 4 Comparative photoelectrochemistry in the same procedure and conditions as in the photoelectrochemical cell 1 except that lithium iodide was added instead of zinc iodide in the liquid electrolyte, and the concentration of lithium iodide in the liquid electrolyte was 100 mmol / L. Battery 4 was produced.
- the battery characteristic evaluation test was conducted using a solar simulator (trade name; “WXS-85-H type” manufactured by Wacom), and the irradiation conditions of pseudo-sunlight from a xenon lamp light source through an AM filter (AM1.5). The measurement was performed under measurement conditions of 100 mW / cm 2 (so-called “1Sun” irradiation conditions).
- Example 10 Preparation of Titanium Dioxide Dispersion 15 g of titanium dioxide fine particles (Nippon Aerosil Co., Ltd., Degussa P-25), 45 g of water, dispersant (Triron X, manufactured by Aldrich Co., Ltd.) -100) 1 g, 30 g of zirconia beads having a diameter of 0.5 mm (manufactured by Nikkato Co., Ltd.) were added, and dispersion treatment was performed at 1500 rpm for 2 hours using a sand grinder mill (manufactured by Imex). Zirconia beads were filtered off from the resulting dispersion. The average particle diameter of the titanium dioxide fine particles in the obtained dispersion was 2.5 ⁇ m. The particle size was measured with a master sizer manufactured by MALVERN.
- this semiconductor-coated glass plate was placed in an electric furnace (muffle furnace FP-32 manufactured by Yamato Scientific Co., Ltd.) and baked at 450 ° C. for 30 minutes.
- the semiconductor-coated glass plate was taken out and cooled, and then immersed in an ethanol solution (concentration: 3 ⁇ 10 ⁇ 4 mol / L) of the dyes shown in Table 11 for 3 hours.
- the semiconductor-coated glass plate on which the dye was adsorbed was immersed in 4-tert-butylpyridine for 15 minutes, washed with ethanol, and naturally dried.
- the thickness of the dye-sensitized titanium oxide fine particle layer thus obtained was 10 ⁇ m, and the coating amount of the titanium oxide fine particles was 20 g / m 2 .
- the amount of dye adsorbed was in the range of 0.1 to 10 mmol / m 2 depending on the type.
- the platinum thin film side of the counter electrode made of a glass plate on which platinum is vapor-deposited through a spacer is placed. A glass plate was fixed. The open end of the obtained assembly was immersed in the electrolyte solution, and the reaction solution was infiltrated into the dye-sensitized titanium oxide fine particle layer by capillary action.
- the mixture was heated at 80 ° C. for 30 minutes to perform a crosslinking reaction.
- the dye-sensitized titanium oxide fine particle layer 20, the electrolyte layer 30, the platinum thin film 42, and the glass are formed on the conductive layer 12 of the conductive glass plate 10.
- a photoelectrochemical cell a-1 (sample number 10-1) of the present invention in which the counter electrode 40 composed of the plate 41 was sequentially laminated was obtained.
- Photoelectrochemical cell b An electrode A (20 mm ⁇ 20 mm) composed of a titanium oxide fine particle layer dye-sensitized with the dye of the present invention as described above was superimposed on a platinum-deposited glass plate of the same size via a spacer.
- Photoelectrochemical cell c (electrolyte described in JP-A-9-27352)
- the electrolytic solution was applied and impregnated on the electrode A (20 mm ⁇ 20 mm) composed of the titanium oxide fine particle layer dye-sensitized with the dye of the present invention as described above.
- the electrolyte was 1 g of hexaethylene glycol methacrylate (manufactured by Nippon Oil & Fats Chemical Co., Ltd., Bremer PE-350), 1 g of ethylene glycol, and 2-hydroxy-2-methyl-1-phenyl-propane as a polymerization initiator.
- a photoelectrochemical cell c-2 (Sample No. 10-6) was obtained by repeating the above steps except that the dye was changed as shown in Table 10.
- the alligator clips were connected to the conductive glass plate 10 and the platinum-deposited glass plate 40 of the photoelectrochemical cell, respectively, and each alligator clip was connected to a current-voltage measuring device (Keutley SMU238 type (trade name)). This was irradiated with simulated sunlight from the conductive glass plate 10 side, and the generated electricity was measured with a current-voltage measuring device.
- Table 11 shows the initial value of the conversion efficiency of the photoelectrochemical cell determined in this way and the rate of decrease in conversion efficiency after 600 hours of continuous irradiation. An initial value of conversion efficiency of 2.7% or more was accepted and less than 2.7% was rejected. Moreover, the case where the fall rate of the conversion efficiency after progress of 600 hours was 20% or less was set as the pass, and the case where it exceeded 20% was set as the failure.
- Nitrogen-containing polymer ⁇ and electrophile ⁇ represent the following compounds.
- Table 11 in the photoelectrochemical cell using the metal complex dye of the present invention, both the initial values of the conversion efficiency are acceptable levels, and the conversion efficiency after 600 hours elapses is 20% or less. Showed excellent durability. Further, it was found that even when the metal complex dye represented by the general formula (1) was used in combination with the dye represented by the general formula (13), the initial value and durability of the conversion efficiency were acceptable levels. On the other hand, when the comparative dye was used, neither the initial value of the conversion efficiency nor the durability could reach the acceptable level.
- the chloroform solution was lightly applied to the porous layer on which the metal complex dye YA-2 and the comparative dye YB-1 were adsorbed, and soaked in the pores of the porous layer. A drop of the solution was then placed directly on the surface and dried at room temperature.
- the coated support was then attached to a vapor deposition apparatus and further 2,2 ′, 7,7′-tetrakis (diphenylamino) -9,9′- with a thickness of 100 nm by thermal vapor deposition under a vacuum of about 10 ⁇ 5 mbar. A layer of spirobifluorene was formed. Furthermore, a gold layer having a thickness of 200 nm was coated on the coated support as a counter electrode in a vapor deposition apparatus.
- the sample thus prepared was attached to an optical device including a high-pressure lamp, an optical filter, a lens and a mounting. By using the filter and installing the lens in an appropriate place, the intensity of the irradiated light could be changed.
- the gold layer and the SnO 2 layer were contacted and attached to the apparatus shown in the current measuring apparatus while the sample was irradiated. For the measurement, light having a wavelength of less than 430 nm was blocked using an appropriate optical filter. Furthermore, the apparatus was adjusted so that the intensity of the radiation was approximately equal to about 1000 W / m 2 ).
- Example 12 In a tandem cell produced in the same manner as in Example 1 of JP-A-2000-90989, a photoelectrochemical cell using the metal complex dye YA-9 (Zn) of the present invention and a comparative dye YB-1 (Zn) were used. A photoelectrochemical cell was produced. When the conversion efficiency of these photoelectrochemical cells was measured, it was found that the conversion efficiency of the photoelectrochemical cell of the present invention was 50% greater than that of the comparativelectrochemical cell, indicating excellent characteristics. .
- the obtained colloidal solution containing titanium oxide particles is slowly concentrated with an evaporator until the titanium oxide has a concentration of 10 wt%, and then polyethylene glycol (manufactured by Kishida Chemical Co., Ltd., weight average molecular weight: 200000) is added to the titanium oxide.
- a suspension in which titanium oxide particles were dispersed was obtained by adding 40% by mass and stirring.
- the prepared titanium oxide suspension was applied by the doctor blade method to the transparent conductive film 2 side of the glass substrate 1 on which the SnO 2 film was formed as the transparent conductive film 2 to obtain a coating film having an area of about 10 mm ⁇ 10 mm.
- This coating film is pre-dried at 120 ° C. for 30 minutes, and further baked at 500 ° C. for 30 minutes in an oxygen atmosphere to become the first porous semiconductor layer of the first porous photoelectric conversion layer 4.
- the film thickness is 10 ⁇ m.
- About a titanium oxide film was formed.
- the glass substrate 1 provided with the transparent conductive film 2 and the porous semiconductor layer 3 is immersed in the dye solution for adsorbing the first dye heated to about 50 ° C. for 10 minutes, and the porous semiconductor layer 3 is filled with the first substrate.
- the dye was adsorbed.
- the glass substrate 1 was washed several times with absolute ethanol and dried at about 60 ° C. for about 20 minutes.
- the glass substrate 1 was immersed in 0.5N hydrochloric acid for about 10 minutes, and then washed with ethanol to remove an excessive amount of the first dye on the second porous semiconductor layer. Further, the glass substrate 1 was dried at about 60 ° C. for about 20 minutes.
- the dyes described in Table 12 (YA-9 (Mn) or YB-1 (Mn)) are dissolved in ethanol.
- a dye solution for adsorption of the second dye having a concentration of 1 ⁇ 10 ⁇ 4 mol / liter was prepared.
- the glass substrate 1 provided with the transparent conductive film 2 and the porous semiconductor layer 3 on which the first dye is adsorbed is immersed in a dye solution for adsorbing the second dye at room temperature and normal pressure for 15 minutes to obtain a porous semiconductor.
- the second dye was adsorbed on the layer 3. Thereafter, the glass substrate 1 was washed several times with absolute ethanol and dried at about 60 ° C. for about 20 minutes.
- the haze ratio of the porous semiconductor layer was measured and found to be 83 to 85%.
- dimethylpropylimidazolium iodide has a concentration of 0.5 mol / liter
- lithium iodide has a concentration of 0.1 mol / liter
- iodine has a concentration of 0.05 mol / liter.
- a redox electrolyte solution was prepared.
- the porous semiconductor layer 3 side of the glass substrate 1 provided with the porous semiconductor layer 3 on which the first dye and the second dye are adsorbed, and the counter electrode side support 20 made of ITO glass provided with platinum as the counter electrode layer 8.
- the photoelectrochemical cell was completed by installing it so as to face the platinum side, injecting the prepared redox electrolyte and sealing the periphery with an epoxy resin sealing material 9.
- the second porous semiconductor layer is formed using the titanium oxide suspension that is the same layer as the second porous semiconductor layer and the first porous semiconductor layer, that is, the first porous semiconductor layer is formed. Except for this, a titanium oxide film 2 was prepared in the same manner as the titanium oxide film 1, and a photoelectrochemical cell was similarly prepared and evaluated using the titanium oxide film 2. The haze ratio of the porous photoelectric conversion layer was 13 to 16%.
- the conversion efficiency of the obtained photoelectrochemical cell was measured at AM-1.5 (100 mW / cm 2 ).
- a conversion efficiency of 7.0% or more is A, 6.0% or more and less than 7.0% B, 5.0% or more and less than 6.0% C, 5.5% or more 6. Less than 0% is indicated as D, 5.0% or more and less than 5.5% is indicated as E, less than 5.0% is indicated as F, conversion efficiency C or more is indicated as pass, and less than D is indicated. Was rejected.
- Titanium oxide suspension was prepared by dispersing 4.0 g of commercially available titanium oxide particles (manufactured by Teika Co., Ltd., average particle size 20 nm) and 20 mL of diethylene glycol monomethyl ether with a paint shaker using hard glass beads for 6 hours. . Next, this titanium oxide suspension was applied to a glass plate (electrode layer) to which a tin oxide conductive layer had been previously attached using a doctor blade, pre-dried at 100 ° C. for 30 minutes, and then heated to 500 ° C. in an electric furnace. Was fired for 40 minutes to form a porous titanium oxide film on the glass plate.
- a dye solution of the present invention in which the dye of the present invention was dissolved in ethanol and a dye solution of a comparative dye in which the comparative dye was dissolved in ethanol were obtained.
- the concentration of these dye solutions was 1 ⁇ 10 ⁇ 4 mol / liter.
- the glass plate on which the film-like titanium oxide was formed was placed in this solution, and after the dye was adsorbed at 60 ° C. for 60 minutes, the dye was adsorbed on the glass plate by drying.
- a photoelectric conversion layer on which a porous titanium oxide layer was formed was formed (Sample A).
- a toluene solution (1%) of polyvinylcarbazole (weight average molecular weight 3,000) as a hole transport material was applied and dried under reduced pressure to form a hole transport layer (Sample B). ).
- Conversion efficiency is 1.5% or more for ⁇ , 1.0% or more and less than 1.5% for ⁇ , 0.5% or more and less than 1.0% for ⁇ , and less than 0.5%.
- the thing was displayed as x and the thing whose conversion efficiency was 0.5% or more was set as the pass.
- dye of this invention was excellent in the photoelectric conversion efficiency, and even if it was this type
- first photoelectric conversion layer 4.0 g of commercially available titanium oxide particles (manufactured by Teika Co., Ltd., average particle size 30 nm) and 20 ml of diethylene glycol monomethyl ether were dispersed with a paint shaker for 6 hours using hard glass beads, and titanium oxide. A suspension was made. Next, this titanium oxide suspension was applied to a glass plate to which a tin oxide conductive layer had been previously attached using a doctor blade, preliminarily dried at 100 ° C. for 30 minutes, and then baked at 500 ° C. for 40 minutes. A titanium oxide film was obtained.
- R-1, R-7 or R-8 listed in Table 14 was dissolved in ethanol to obtain a first dye solution having a concentration of 3 ⁇ 10 ⁇ 4 mol / L.
- the glass plate in which the film-like titanium oxide is formed in this solution is put, and after the dye adsorption is performed at 60 ° C. for 720 minutes, the first photoelectric conversion layer (sample A) on which the first dye is adsorbed is dried. Obtained.
- the dye of the present invention was dissolved in dimethyl sulfoxide to obtain a dye solution having a concentration of 1 ⁇ 10 ⁇ 4 mol / L.
- the glass plate on which film-like nickel oxide is formed is put in this solution, dye adsorption is performed at 70 ° C. for 60 minutes, and then the second photoelectric element on which the second dye described in Table 14 is adsorbed is dried.
- a conversion layer (sample B) was obtained.
- the sample B is overlaid on the sample A, a liquid electrolyte is put between these two electrodes, the side surface is sealed with resin, a lead wire is attached, and the photoelectric conversion element (element of the present invention) Configuration C) was prepared.
- the liquid electrolyte is a mixed solvent of acetonitrile / ethylene carbonate (volume ratio is 1: 4), tetrapropylammonium iodide and iodine, each having a concentration of 0.46 mol / L, 0.06 mol / L. What was melt
- a transparent conductive glass plate provided with the sample A as one electrode and carrying platinum as a counter electrode was used.
- a liquid electrolyte was placed between the two electrodes, and this side surface was sealed with resin, and then a lead wire was attached to produce a photoelectric conversion element (element configuration D) of the present invention.
- the obtained photoelectric conversion elements (samples C and D) were irradiated with light having an intensity of 1000 W / m 2 using a solar simulator. Conversion efficiency is 6.5% or more for ⁇ , 6.0% or more but less than 6.5% ⁇ , 5.0% or more but less than 6.0% ⁇ , less than 5.0% The thing was displayed as x and the thing whose conversion efficiency was 6.0% or more was set as the pass.
- dye of this invention was excellent in the photoelectric conversion efficiency, and even if it was this type
- Example 16 A photoelectrochemical cell using a polymer electrolyte was prepared and evaluated.
- the coating liquid for producing the titanium oxide film was 4.0 g of commercially available titanium oxide particles (manufactured by Teika Co., Ltd., trade name AMT-600, anatase type crystal, average particle size 30 nm, specific surface area 50 m 2 / g) and diethylene glycol monomethyl. 20 ml of ether was dispersed with a paint shaker for 7 hours using glass beads to prepare a titanium oxide suspension.
- this titanium oxide suspension is formed on a glass substrate 1 having a film thickness of about 11 ⁇ m and an area of about 10 mm ⁇ 10 mm and SnO 2 as a transparent conductive film. And preliminarily dried at 100 ° C. for 30 minutes and then baked under oxygen at 460 ° C. for 40 minutes. As a result, a titanium oxide film A having a thickness of about 8 ⁇ m was produced.
- the dyes shown in Table 15 were dissolved in absolute ethanol at a concentration of 1 ⁇ 10 ⁇ 4 mol / liter to prepare an adsorption dye solution.
- the adsorbing dye solution as described above, the obtained transparent substrate provided with the titanium oxide film and the transparent conductive film was placed in a container and allowed to penetrate for about 4 hours to adsorb the dye. Thereafter, it was washed several times with absolute ethanol and dried at about 60 ° C. for about 20 minutes.
- a monomer represented by the following general formula was prepared.
- R is composed of a methyl group
- A is composed of eight polyethylene oxide groups, two polypropylene oxide groups, and a butanetetrayl group as a central core.
- This monomer was dissolved in propylene carbonate (hereinafter referred to as PC) at a concentration of 20% by mass, and azobisisobutyronitrile (AIBN) was used as a thermal polymerization initiator with respect to the above monomer. And dissolved at a concentration of 1% by mass to prepare a monomer solution.
- the monomer solution was impregnated with the titanium oxide film by the following method.
- a beaker was placed in the vacuum container, and a transparent substrate equipped with the titanium oxide film A and a transparent conductive film was placed therein, and was evacuated with a rotary pump for about 10 minutes. While maintaining the vacuum container in a vacuum state, the monomer solution was poured into a beaker and impregnated for about 15 minutes to sufficiently soak the monomer solution in titanium oxide. A polyethylene separator, a PET film and a pressing plate were installed and fixed with a jig. Then, it heat-polymerized by heating at about 85 degreeC for 30 minutes, and formed the high molecular compound layer on the titanium oxide film.
- a redox electrolyte solution to be impregnated into the polymer compound was prepared.
- the redox electrolyte was prepared by dissolving 0.5 mol / liter of lithium iodide and 0.05 mol / liter of iodine using PC as a solvent.
- the polymer compound prepared on the above-described titanium oxide film A was immersed in this solution for about 2 hours, so that the polymer compound was impregnated with the redox electrolyte solution to prepare a polymer electrolyte.
- membrane was installed, the periphery was sealed with the epoxy-type sealing agent, and the element A was created.
- the titanium oxide film A After the dye adsorption of the titanium oxide film A, it is prepared by dissolving lithium iodide at a concentration of 0.5 mol / liter and iodine at a concentration of 0.05 mol / liter using PC as a solvent without performing monomer treatment.
- the oxidized redox electrolyte solution was injected between the counter electrode as it was and sealed to prepare an element B.
- a solar simulator was used to irradiate light having an intensity of 1000 W / m 2 and the conversion efficiency was measured. The results are shown in Table 15. Conversion efficiency is 3.5% or more, ⁇ , 2.5% or more, less than 3.5%, ⁇ , 2.0% or more, less than 2.5%, ⁇ , less than 2.0% Was displayed as x.
- the photoelectric conversion element shown in FIG. 1 was produced as follows. On the glass substrate, tin oxide doped with fluorine was formed as a transparent conductive film by sputtering, and this was scribed with a laser to divide the transparent conductive film into two parts. Next, 32 g of anatase-type titanium oxide (P-25 (trade name) manufactured by Nippon Aerosil Co., Ltd.) is mixed with 100 mL of a mixed solvent having a volume ratio of water and acetonitrile of 4: 1, and a rotating / revolving mixing conditioner is prepared. The resulting mixture was uniformly dispersed and mixed to obtain a semiconductor fine particle dispersion. This dispersion was applied to a transparent conductive film and heated at 500 ° C. to produce a light receiving electrode.
- P-25 trade name
- a mixed solvent having a volume ratio of water and acetonitrile of 4: 1
- a dispersion containing 40:60 (mass ratio) of silica particles and rutile-type titanium oxide is prepared, and this dispersion is applied to the light receiving electrode and heated at 500 ° C. to form an insulating porous material. Formed body.
- a carbon electrode was formed as a counter electrode.
- the glass substrate on which the insulating porous body was formed was immersed in an ethanol solution of the dye described in Table 16 below (only the dye 1 or a mixture of the dye 1 and the dye 2) for 5 hours. .
- the dyed glass was immersed in a 10% ethanol solution of 4-tert-butylpyridine for 30 minutes, then washed with ethanol and naturally dried.
- the thickness of the photosensitive layer thus obtained was 10 ⁇ m, and the coating amount of semiconductor fine particles was 20 g / m 2 .
- As the electrolytic solution a methoxypropionitrile solution of dimethylpropylimidazolium iodide (0.5 mol / L) and iodine (0.1 mol / L) was used.
- Example 18 Preparation of Titanium Dioxide Dispersion 15 g of titanium dioxide fine particles (Nippon Aerosil Co., Ltd., Degussa P-25), 45 g of water, dispersant (Triron X, manufactured by Aldrich Co., Ltd.) -100) 1 g, 30 g of zirconia beads having a diameter of 0.5 mm (manufactured by Nikkato Co., Ltd.) were added, and dispersion treatment was performed at 1500 rpm for 2 hours using a sand grinder mill (manufactured by Imex). Zirconia beads were filtered off from the resulting dispersion. The average particle diameter of the titanium dioxide fine particles in the obtained dispersion was 2.5 ⁇ m. The particle size was measured with a master sizer (trade name) manufactured by MALVERN.
- Titanium Oxide Fine Particle Layer Adsorbed with Dye 20 mm long and 20 mm wide conductive glass plate coated with fluorine-doped tin oxide (Asahi Glass Co., Ltd., TCO glass-U, surface resistance: approx. 30 ⁇ / m 2 ), and a spacer adhesive tape was applied to both ends of the conductive layer side (a portion having a width of 3 mm from the end), and then the dispersion was applied onto the conductive layer using a glass rod. . After application of the dispersion, the adhesive tape was peeled off and air-dried at room temperature for 1 day.
- this semiconductor-coated glass plate was placed in an electric furnace (muffle furnace FP-32 manufactured by Yamato Scientific Co., Ltd.) and baked at 450 ° C. for 30 minutes. After the semiconductor-coated glass plate was taken out and cooled, it was immersed in an ethanol solution (concentration: 1 ⁇ 10 ⁇ 4 mol / L) of the dyes shown in Table 17 for 3 hours. The semiconductor-coated glass plate on which the dye was adsorbed was immersed in 4-tert-butylpyridine for 15 minutes, washed with ethanol, and naturally dried to obtain a titanium oxide fine particle layer (electrode A) on which the dye was adsorbed.
- an electric furnace muffle furnace FP-32 manufactured by Yamato Scientific Co., Ltd.
- the thickness of the dye-sensitized titanium oxide fine particle layer of the electrode A was 10 ⁇ m, and the coating amount of the titanium oxide fine particles was 20 g / m 2 .
- the amount of dye adsorbed was in the range of 0.1 to 10 mmol / m 2 depending on the type.
- the electrolyte composition has a high viscosity and it is difficult to impregnate the electrolyte composition using capillary action, the electrolyte composition is heated to 50 ° C. and applied to the titanium oxide electrode. After the electrode was placed under reduced pressure and the electrolyte composition sufficiently penetrated and the air in the electrode escaped, platinum-deposited glass (counter electrode) was overlaid to produce a photoelectrochemical cell in the same manner.
- the above steps were carried out with the dye changed, and photoelectrochemical cells were prepared as shown in Table 17.
- the electrolyte composition used for each photoelectrochemical cell was one containing 98% by mass of the following heterocyclic quaternary salt compound and 2% by mass of iodine.
- Conversion efficiency of 6.0% or more is A, 5% or more and less than 6% B, 4% or more and less than 5% C, 3% or more and less than 4% D, 1.5% Those with less than 3% are displayed as E, those with less than 1.5% are displayed as F, those with a conversion efficiency of D or more are accepted, and those with less than D are rejected.
- Semiconductor fine particles a were added to 100 cc of a mixed solvent having a volume ratio of 4: 1 of water and acetonitrile at a concentration of 32 g per 100 cc of the solvent, and uniformly dispersed and mixed by using a rotating / revolving mixing conditioner. As a result, it was found that the obtained white semiconductor fine particle dispersion became a high-viscosity paste of 50 to 150 N ⁇ s / m 2 and had liquid properties suitable for use in coating as it was. Sample Nos. 19-3 and 19-10 were blended with 7.7 g of polyethylene glycol (PEG) powder having an average molecular weight of 500,000 per 100 cc of solvent. Solids other than the semiconductor fine particles were not added to the other semiconductor fine particle dispersions.
- PEG polyethylene glycol
- Dye concentration is 1 ⁇ 10 ⁇ 4 mol / liter in a mixed solvent of 2: 1: 1 by volume of acetonitrile: t-butanol: ethanol obtained by drying the dyes shown in Table 18. It dissolved so that it might become.
- an organic sulfonic acid derivative having a structure of pC 9 H 19 —C 6 H 4 —O— (CH 2 CH 2 —O) 3 — (CH 2 ) 4 —SO 3 Na is added.
- a solution for dye adsorption was prepared by dissolving at a concentration of 0.025 mol / liter.
- E1 1,2-dimethyl-3-propylimidazolium iodide
- E2 1-butyl-3-methylimidazolium iodide
- E3 1-methyl-3-propylimidazolium iodide
- E4 1,3-di (2- ( 2- (2-Methoxyethoxy) ethoxy) ethyl) imidazolium iodide
- the above cell assembly process and electrolyte injection process were all performed in dry air having the above dew point of ⁇ 60 ° C.
- the cell After injecting the molten salt, the cell was sucked for several hours under vacuum to deaerate the inside of the cell including the photosensitive electrode and the molten salt, and finally the small holes were sealed with low-melting glass.
- a conversion efficiency of 4.0% or more is A, 3.5% or more and less than 4% B, 3% or more and less than 3.5% C, 2.5% or more and less than 3% D, 2.0% or more and less than 2.5% was displayed as E, and less than 2.0% was displayed as F, conversion efficiency D or more was accepted, and less than D was rejected.
- Example 20 As an epoxy sealant in Experiment 18, a glass sphere having a diameter of 25 ⁇ m was dispersed almost uniformly in a resin composition consisting of Epicoat 828 (trade name, manufactured by Japan Epoxy Resin Co., Ltd.), a curing agent and a plastic paste. A photoelectrochemical cell was prepared in the same manner except that the stopper paste was used, and the photoelectric conversion efficiency was measured. Table 19 shows the conversion efficiency ( ⁇ ) of each dye-sensitized solar cell determined in this manner, the rate of decrease in conversion efficiency after 1000 hours of storage at 85 ° C., and the rate of decrease in conversion efficiency after 500 hours of continuous light irradiation.
- Epicoat 828 trade name, manufactured by Japan Epoxy Resin Co., Ltd.
- Shown in Conversion efficiency of 6.0% or more is A, 5% or more and less than 6% B, 4% or more and less than 5% C, 3% or more and less than 4% D, 1.5% Those with less than 3% are displayed as E, those with less than 1.5% are displayed as F, those with a conversion efficiency of D or more are accepted, and those with less than D are rejected.
- the initial value of the photoelectric conversion efficiency of the photoelectrochemical cell produced using the metal complex dye of the present invention was acceptable.
- the rate of decrease in photoelectric conversion efficiency after storage in the dark and after continuous light irradiation was large and failed, but after the storage in the dark of the photoelectrochemical cell of the present invention and The rate of decrease in photoelectric conversion efficiency after continuous light irradiation was small and was at an acceptable level.
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Abstract
Description
<2>前記酸性基がカルボキシル基である<1>記載の金属錯体色素。
<3>酸性基が前記一般式(1)におけるA又はCのいずれか一方に有する<1>又は<2>記載の金属錯体色素。
<4>前記一般式(1)におけるA、Cの少なくとも一方が、下記一般式(3)又は(4)で表される<1>~<3>のいずれか1項記載の金属錯体色素。
<5>前記一般式(1)におけるBが、下記一般式(5)~(8)の構造を有する<1>~<4>のいずれか1項記載の金属錯体色素。
<6>前記一般式(1)が、下記一般式(9)又は(10)で表される構造を有する<1>~<5>のいずれか1項記載の金属錯体色素。
<7>前記一般式(1)が、下記一般式(11)で表される構造を有する<1>~<5>のいずれか記載の金属錯体色素。
<8>前記一般式(9)~(11)において、R67、R68、R71、R72、R75及びR76から選ばれた1つ又は2つの基が、酸性基又は酸性基を有する基である<6>又は<7>記載の金属錯体色素。
<9>前記酸性基を有する構造が、酸性基の結合する原子上にさらに電子吸引基を有する<1>~<8>のいずれか1項記載の金属錯体色素。
<10>前記酸性基を有する構造が、下記一般式(12)で表される構造を有する<1>~<9>のいずれか1項記載の金属錯体色素。
<12><1>~<11>のいずれか1項記載の構造を有する金属錯体色素と半導体微粒子とを有する感光体層を具備する光電変換素子。
<13>前記色素が、<1>~<11>のいずれか1項記載の金属錯体色素に、さらにほかの色素を含有する<12>記載の光電変換素子。
<14>前記のほかの色素が、下記一般式(13)で表される構造を有する<13>記載の光電変換素子。
Mz(LL1)m1(LL2)m2(X)m3・CI 一般式(13)
[ 一般式(13)において、Mzは金属原子を表し、LL1は下記一般式(14)で表される2座又は3座の配位子であり、LL2は下記一般式(15)で表される2座又は3座の配位子である。
なお、光電変換素子の上下は特に定めなくてもよいが、本明細書において、図示したものに基づいて言えば、受光側となる対極4の側を上部(天部)の方向とし、支持体1の側を下部(底部)の方向とする。
(A1)一般式(1)の構造を有する複核の金属錯体色素
感光体を構成する多孔質半導体微粒子に吸着される色素(色素化合物)は、下記一般式(1)の構造、すなわち複核(A及びC)を有し、1又は2つの酸性基を有する金属錯体色素である。酸性基とは、カルボキシ基等の酸性基そのもののほか、所望の効果を奏する範囲で連結基を介して置換したものでもよく、この連結基を含めて酸性基と称する。
この中でも特に好ましいBの連結基は、一般式(6)、(7)、(8)である。連結基Bがこれらの構造を有することにより、複核同士(一般式(1)におけるA及びC)との間で共役となり、吸収域拡大の効果が得られ、これにより変換効率が向上する。また、A及びCのうち、いずれか一方にのみ酸性基を有している場合、非共役で連結しているときに比べて吸着基を有していない側のA又はCから、半導体微粒子(例えば、酸化チタン微粒子)への電子注入が効率的に行われる。なお、本明細書では特に断らなくても、その結合手の価数など、化学式は共鳴構造に整合するように解釈すればよい。
一般式(2)において、Xは炭素原子又は窒素原子を表す。Mは2つの水素原子、2つの金属原子又は1つの金属原子を表す。以下、本発明において、金属原子は、酸化物状態のものも含む。好ましい金属原子は、Ti、V、Mn、Fe、Co、Ni、Cu、Zn、Ga、Ge、Y、Zr、Nb、Mo、Tc、Ru、Rh、Pd、Ag、Cd、In、Sn、Hf、Ta、W、Re、Os、Ir、Pt、Au、Hg、Pbである。さらに好ましくは、Zn、Ru、V、Sn、In、Pb、Osである。
好ましい置換基としては、下記一般式(A)で示されるものを挙げることができる。
-(X)n-Ra 一般式(A)
一般式(A)において、XはNRbを表し、Rbは水素原子又は脂肪族基を表す。Raは脂肪族基、芳香族基、複素環基を表す。Raで表される芳香族基としては、ベンゼン、ナフタレン、アントラセン、フェナントレンなどが挙げられ、複素環基としては、アントラキノン、カルバゾール、ピリジン、キノリン、チオフェン、フラン、キサンテン、チアントレンなどが挙げられる。Raの好ましい例としては複素環基が挙げられる。
Mは2つの水素原子、2つの金属原子又は1つの金属原子を表す。以下、本発明において、金属原子は、酸化物状態のものも含む。好ましい金属原子は、Ti、V、Mn、Fe、Co、Ni、Cu、Zn、Ga、Ge、Y、Zr、Nb、Mo、Tc、Ru、Rh、Pd、Ag、Cd、In、Sn、Hf、Ta、W、Re、Os、Ir、Pt、Au、Hg、TI、Pbである。さらに好ましくは、Zn、Ru、V、Sn、In、Pb、Osである。酸化物状態のものとしては、例えば、VOやTiOを挙げることができる。
なお、一般式(10)の化合物は、一般式(3)及び(4)のRX及びピロール環の一部が連結基Bに組み込まれる形で結合している形態である。
金属錯体色素中に酸性基を1又は2つ有することにより、金属錯体色素の有機溶媒への溶解性が向上し、酸化チタンなどの多孔質半導体粒子へ色素を吸着させるときの溶媒種や、色素濃度の選択の幅を広くすることができる。このため最適な条件で光電変換素子や光電気化学電池を製造することができ、光電変換効率の高い光電変換素子や光電気化学電池を得ることができる。
一般式(11)において、好ましい金属原子は、Ti、V、Mn、Fe、Co、Ni、Cu、Zn、Ga、Ge、Y、Zr、Nb、Mo、Tc、Ru、Rh、Pd、Ag、Cd、In、Sn、Hf、Ta、W、Re、Os、Ir、Pt、Au、Hg、Pbである。さらに好ましくは、Zn、Ru、V、Sn、In、Pb、Osである。酸化物状態のものとしては、例えば、VOやTiOを挙げることができる。
(1)各種置換基を有するピロール環をアルデヒド共存下で反応させることで、単核の金属錯体(ポルフィリン等)が得られる。これを他の単核または複核の金属錯体と、連結部位に合わせたカップリング反応を行うことで、複核の金属錯体を得ることができる。また、金属の導入は、金属塩とともに適当な溶媒で加熱攪拌することで得られる。
(2)隣り合う二つのシアノ基を持つ中間体(例えばフタロニトリル等)を、金属種と共にキノリン等の溶媒中で加熱攪拌する。このとき、同一骨格内に隣り合うシアノ基を二組有する中間体(例えばテトラシアノベンゼン誘導体、連結基Bにより連結された二つのフタロニトリル誘導体等)を適当量同時に反応させるか、単核の金属錯体調整後に、隣り合う二つのシアノ基を導入し、同様の反応を行う。
(A2)前記以外の色素の使用
光電変換素子及び光電気化学電池に使用される色素としては、上記の(A1)金属錯体色素に加えてほかの色素を使用することができる。好ましくは、これらの色素(A1及びA2)を含む色素溶液を調製して使用することが好ましい。ほかの色素としては、下記一般式(13)で表される構造を有するものを挙げることができる。
本発明の光電変換素子及び光電気化学電池においては、上記一般式(1)の構造を有する色素とともに下記一般式(13)で表される構造を有する色素を用いる。
Mz(LL1)m1(LL2)m2(X)m3・CI 一般式(13)
一般式(13)の構造を有する色素は、金属原子に、少なくとも配位子LL1及び配位子LL2の一方と、場合により特定の官能基Xが配位しており、必要な場合はCIにより電気的に中性に保たれている。
(A2-1)金属原子Mz
Mzは金属原子を表す。Mzは好ましくは4配位または6配位が可能な金属であり、より好ましくはRu、Fe、Os、Cu、W、Cr、Mo、Ni、Pd、Pt、Co、Ir、Rh、Re、Mn又はZnである。特に好ましくは、Ru、Os、Zn又はCuであり、最も好ましくはRuである。
配位子LL1は、下記一般式(14)により表される2座または3座の配位子により表される2座または3座の配位子であり、好ましくは2座配位子である。配位子LL1の数を表すm1は0~3の整数であり、1~3であるのが好ましく、1であるのがより好ましい。m1が2以上のとき、LL1は同じでも異なっていてもよい。ただし、m1と、後述の配位子LL2の数を表すm2のうち少なくとも一方は1以上の整数である。したがって金属原子に、配位子LL1及び/又は配位子LL2が配位している。
R105とR106は、直接ピリジン環に結合していてもよい。R105とR106は、L1及び/又はL2を介してピリジン環に結合していてもよい。
d1、d2はそれぞれ0以上の整数であり、好ましくは1~3の整数である。
d3は0または1であり、a1及びa2はそれぞれ独立に0~3の整数を表す。a1が2以上のときR101は同じでも異なっていてもよく、a2が2以上のときR102は同じでも異なっていてもよい。a1は0又は1であるのが好ましく、a2は0~2の整数であるのが好ましい。特に、d3が0のときa2は1又は2であるのが好ましく、d3が1のときa2は0又は1であるのが好ましい。a1とa2の和は0~2の整数であるのが好ましい。
一般式(16-2)中のR107、R108は図示の都合上1つの環上に置換したように書かれているが、その環上にあっても、あるいは図示されたものとは異なる環上に置換していてもよい。
形成される環はピペリジン環又はピロリジン環であるのが好ましい。d2が2以上のときR126は同じでも異なっていてもよく、互いに連結して環を形成していてもよい。
一般式(13)中、LL2は2座又は3座の配位子を表す。配位子LL2の数を表すm2は0~2の整数であり、0又は1であるのが好ましい。m2が2のときLL2は同じでも異なっていてもよい。ただし、m2と、前述の配位子LL1の数を表すm1のうち少なくとも一方は1以上の整数である。
一般式(13)中、Xは1座又は2座の配位子を表す。配位子Xの数を表すm3は0~2の整数を表し、m3は好ましくは1又は2である。Xが1座配位子のとき、m3は2であるのが好ましく、Xが2座配位子のとき、m3は1であるのが好ましい。m3が2のとき、Xは同じでも異なっていてもよく、X同士が連結していてもよい。
一般式(14)中のCIは電荷を中和させるのに対イオンが必要な場合の対イオンを表す。一般に、色素が陽イオン又は陰イオンであるか、あるいは正味のイオン電荷を有するかどうかは、色素中の金属、配位子および置換基に依存する。
一般式(13)で表される構造を有する色素は、半導体微粒子の表面に対する適当な結合基(interlocking group)を少なくとも1つ以上有するのが好ましい。この結合基を色素中に1~6個有するのがより好ましく、1~4個有するのが特に好ましい。カルボキシル基、スルホン酸基、ヒドロキシル基、ヒドロキサム酸基(例えば―CONHOH等)、ホスホリル基(例えば―OP(O)(OH)2等)、ホスホニル基(例えば―P(O)(OH)2等)等の酸性基(解離性のプロトンを有する置換基)を色素中に有することが好ましい。
本発明の光電変換素子に用いられる電解質組成物には、酸化還元対として、例えばヨウ素とヨウ化物(例えばヨウ化リチウム、ヨウ化テトラブチルアンモニウム、ヨウ化テトラプロピルアンモニウム等)との組み合わせ、アルキルビオローゲン(例えばメチルビオローゲンクロリド、ヘキシルビオローゲンブロミド、ベンジルビオローゲンテトラフルオロボレート)とその還元体との組み合わせ、ポリヒドロキシベンゼン類(例えばハイドロキノン、ナフトハイドロキノン等)とその酸化体との組み合わせ、2価と3価の鉄錯体(例えば赤血塩と黄血塩)の組み合わせ等が挙げられる。これらのうちヨウ素とヨウ化物との組み合わせが好ましい。
図1に示すように、本発明の光電変換素子には、導電性支持体1上には多孔質の半導体微粒子22に色素21が吸着された感光体2が形成されている。後述する通り、例えば、半導体微粒子の分散液を導電性支持体に塗布・乾燥後、本発明の色素溶液に浸漬することにより、感光層を製造することができる。
図1に示すように、本発明の光電変換素子には、導電性支持体1上には多孔質の半導体微粒子22に色素21が吸着された感光層2が形成されている。後述する通り、例えば、半導体微粒子の分散液を前記の導電性支持体に塗布・乾燥後、本発明の色素溶液に浸漬することにより、感光体を製造することができる。
本発明においては、半導体微粒子以外の固形分の含量が、半導体微粒子分散液全体の10質量%以下よりなる半導体微粒子分散液を前記の導電性支持体に塗布し、適度に加熱することにより、多孔質半導体微粒子塗布層を得ることができる。
本発明の複核の金属錯体色素として、以下のYA-1~10及びXA-23、比較色素として、YB-1~3を調製した。
1.YA-4の調製
YA-4a、YA-4b、YA-4c及びYA-4dを順次調製し、YA-4を得た。
3.9gのB-4a、2.5gのB-4bをキノリンに溶解させ、2.4gのVCl3を加えて150℃で10時間撹拌した。冷却後、水を加えてろ過を行い6.0gのYA-4aを得た。
(2)YA-4bの調製
3.5gのYA-4a、1.1gのB-4c、10%の炭酸カリウム水溶液20mL、DMF 90mLを撹拌したところに、Pd(PPh3)4を0.7g加えた。80℃で5時間撹拌後、室温に戻した。酢酸エチルと水を加え抽出、濃縮し、HPLC分取を行い、0.8gのYA-4bを得た。
(3)YA-4cの調製
0.8gのYA-4b、0.3gのB-4d、10%の炭酸ナトリウム水溶液5mL、ジメトキシエタン 20mLを撹拌したところに、Pd(PPh3)4を0.2g加え、80℃で5時間撹拌後、室温に戻した。酢酸エチルと水を加え抽出、濃縮し、0.8gのYA-4cを得た。
(4)YA-4dの調製
0.8gのYA-4c、0.3gのB-4d、0.3gのB-4aをキノリンに溶解させ、0.3gのVCl3を加えて150℃で10時間撹拌した。冷却後、水を加え、ろ過を行った。続けてHPLC分取を行い0.1gのYA-4d(0.1g)を得た。
(5)YA-4の調製
0.10gのYA-4dをジオキサンに溶解させ、ここにKOH水溶液を滴下した後、過加熱還流を1時間行った。その後、HCl水溶液で中和後にろ過を行い、0.07gのYA-4を得た。得られたYA-4のMS-ESI m/z は、1351.20 (M-H)+であった。
まず、B-4dを調製し、これを用いて、YA-9を調製した。
(1)B-4dの調製
(2)YA-9の調製
図1に示す光電変換素子を以下のようにして作製した。
用いた色素の極大吸収波長を測定した。その結果を表Aに示す。測定は、分光光度計(U-4100(商品名)、日立ハイテク社製)によって行い、溶液はTHF:エタノール=1:1を用い、濃度が2μMになるように調整した。
500Wのキセノンランプ(ウシオ電機社製)の光をAM1.5Gフィルター(Oriel社製)およびシャープカットフィルター(KenkoL-42、商品名)を通すことにより紫外線を含まない模擬太陽光を発生させた。この光の強度は89mW/cm2であった。作製した光電変換素子にこの光を照射し、電流電圧測定装置(ケースレー238型、商品名)で、光電変換特性を測定した。
表2に示すように、各試料について、色素を二種類用意して、表2記載の濃度でエタノール中に溶解させた色素溶液を用いた以外は、実験1-1と同様の方法で光電変換素子を作製し、光電変換効率の測定を行った。変換効率が7.0%以上のものを◎、6.0%以上7.0%未満のものを○、5.0%以上6.0%未満のものを△、6.5%未満のものを×として評価し、光電変換効率が6.0%以上のものを合格とした。
ガラス基板上にITO膜を作製し、その上にFTO膜を積層することにより、透明導電膜を作製した。その後透明導電膜上に酸化物半導体多孔質膜を形成することにより、透明電極板を得た。そしてその透明電極板を使用して光電気化学電池を作製し、変換効率を測定した。その方法は以下の(1)~(5)の通りである。
(1)ITO(インジウム・スズ・オキサイド)膜用原料化合物溶液の調製
塩化インジウム(III)四水和物5.58gと塩化スズ(II)二水和物0.23gとをエタノール100mlに溶解して、ITO膜用原料化合物溶液とした。
(2)FTO(フッ素ドープ酸化スズ)膜用原料化合物溶液の調製
塩化スズ(IV)五水和物0.701gをエタノール10mLに溶解し、これにフッ化アンモニウム0.592gの飽和水溶液を加え、この混合物を超音波洗浄機に約20分間かけ、完全に溶解して、FTO膜用原料化合物溶液とした。
(3)ITO/FTO透明導電膜の作製
厚さ2mmの耐熱ガラス板の表面を化学洗浄し、乾燥した後、このガラス板を反応器内に置き、ヒータで加熱した。ヒータの加熱温度が450℃になったところで、(1)で得られたITO膜用原料化合物溶液を、口径0.3mmのノズルから圧力0.06MPaで、ガラス板までの距離を400mmとして、25分間噴霧した。
次に、上記3種の透明電極板を用いて、特許第4260494号公報の図2に示した構造の光電気化学電池を作製した。酸化物半導体多孔質膜の形成は、平均粒径約230nmの酸化チタン微粒子をアセトニトリルに分散してペーストとし、これを透明電極11上にバーコート法により厚さ15μmに塗布し、乾燥後450℃で1時間焼成して行った。その後、この酸化物半導体多孔質膜に表3記載の濃度の色素を担持した。試料番号2-13~2-21の場合は、エタノール溶媒中に2種類の色素を混合して、表3記載の色素濃度としたものを用いた。
(4)で得られた光電気化学電池について、擬似太陽光(AM1.5)を照射し、実験1と同様の方法で光電変換特性を測定し、変換効率を求めた。その結果を表3に示す。
変換効率が6.0%以上のものをA、5%以上6%未満のものをB、4%以上5%未満のものをC、3%以上4%未満のものをD、1.5%以上3%未満のものをE、1.5%未満のものをFとして表示し、変換効率D以上のものを合格とし、D未満のものを不合格とした。また、耐久性は変換効率の初期値に対し700時間後の変換効率が90%以上のものをA、85%以上90%未満のものをB、80%以上85%未満のものをC、70%以上80%未満のものをD、70%未満のものをEとして評価し、変換効率の初期値に対し700時間後の変換効率が70%以上のものを合格とし、70%未満のものを不合格とした。
まず、下記の表4に記載された溶媒を用いて、金属錯体色素溶液の溶媒への溶解性について、目視で評価した。この結果を表4に示す。
(試験セル(i))
縦100mm、横100mm、厚さ2mmの耐熱ガラス板の表面を化学洗浄し、乾燥した後、このガラス板を反応器内に置き、ヒータで加熱した後、上記の実験2で使用したFTO(フッ素ドープ酸化スズ)膜用原料化合物溶液を、口径0.3mmのノズルから圧力0.06MPaで、ガラス板までの距離を400mmとして、25分間噴霧し、FTO膜付きガラス基板を用意した。
試験セル(i)と同様の方法で、縦100mm、横100mmのFTO膜付きガラス基板を用意した。そのFTOガラス基板上に、アディティブめっき法により金属配線層(金回路)を形成した。この金属配線層(金回路)は基板表面に格子状に形成し、回路幅50μm、回路厚5μmとした。この表面に、厚さ300nmのFTO膜を遮蔽層として、SPD法により形成して電極基板(iv)とした。電極基板(iv)の断面をSEM-EDXを用いて確認したところ、配線底部でめっきレジストの裾引きに起因すると思われる潜り込みがあり、影部分にはFTOが被覆されていなかった。
ペルオキソチタン酸及び酸化チタン微粒子を作製し、これを用いて酸化物半導体膜を作製した。これを用いて光電気化学電池を作製し、評価した。
(光電気化学電池(a)の作製)
(1)酸化物半導体膜形成用塗布液(a1)の調製
5gの水素化チタンを1リットルの純水に懸濁し、5質量%の過酸化水素液400gを30分かけて添加し、ついで80℃に加熱して溶解してペルオキソチタン酸の溶液を調製した。この溶液の全量から90容積%を分取し、濃アンモニア水を添加してpH9に調整し、オートクレーブに入れ、250℃で5時間、飽和蒸気圧下で水熱処理を行ってチタニアコロイド粒子(a2)を調製した。得られたチタニアコロイド粒子は、X線回折により結晶性の高いアナターゼ型酸化チタンであった。
次いで、フッ素ドープした酸化スズが電極層として形成された透明ガラス基板上に前記塗布液(a1)を塗布し、自然乾燥し、引き続き低圧水銀ランプを用いて6000mJ/cm2の紫外線を照射してペルオキソ酸を分解させ、塗膜を硬化させた。塗膜を300℃で30分間加熱してヒドロキシプロピルセルロースの分解およびアニーリングを行って酸化物半導体膜(a3)をガラス基板に形成した。
(3)酸化物半導体膜(a3)への色素の吸着
次に、分光増感色素として本発明の色素の濃度3×10-4モル/リットルのエタノール溶液を調製した。この色素溶液を100rpmスピナーで、金属酸化物半導体膜(a3)上へ塗布して乾燥した。この塗布および乾燥工程を5回行った。
(4)電解質溶液の調製
アセトニトリルと炭酸エチレンとの体積比が1:5の混合溶媒に、テトラプロピルアンモニウムアイオダイドを0.46モル/リットル、ヨウ素を0.07モル/リットルの濃度となるように溶解して電解質溶液を調製した。
(2)で作製した、色素を吸着させた酸化物半導体膜(a3)が形成されたガラス基板を一方の電極とし、他方の電極として、フッ素ドープした酸化スズを電極として形成しその上に白金を担持した透明ガラス基板を対向して配置し、側面を樹脂にてシールし、電極間に(4)の電解質溶液を封入し、さらに電極間をリード線で接続して光電気化学電池(a)を作製した。
(6)光電気化学電池(a)の評価
光電気化学電池(a)は、ソーラーシュミレーターで100W/m2の強度の光を照射して、η(変換効率)を測定した。
紫外線を照射してペルオキソ酸を分解させ、膜を硬化させた後、Arガスのイオン照射(日新電気製:イオン注入装置、200eVで10時間照射)を行った以外は酸化物半導体膜(a3)と同様にして酸化物半導体膜(b3)を形成した。酸化物半導体膜(a)と同様に、酸化物半導体膜(b3)に色素の吸着を行った。その後実施例1と同様の方法で光電気化学電池(b)を作成し、ηを測定した。
18.3gの4塩化チタンを純水で希釈して、TiO2換算で1.0質量%含有する水溶液を得た。この水溶液を撹拌しながら、15質量%のアンモニア水を添加し、pH9.5の白色スラリーを得た。このスラリーを濾過洗浄し、TiO2換算で、10.2質量%の水和酸化チタンゲルのケーキを得た。このケーキと5質量%過酸化水素液400gを混合し、ついで80℃に加熱して溶解してペルオキソチタン酸の溶液を調製した。この溶液全量から90体積%を分取し、これに濃アンモニア水を添加してpH9に調整し、オートクレーブに入れ、250℃で5時間、飽和蒸気圧下で水熱処理を行ってチタニアコロイド粒子(c1)を調製した。
その後光電気化学電池(a)と同様の方法で光電気化学電池(c)を作製し、ηを測定した。
18.3gの4塩化チタンを純水で希釈してTiO2換算で1.0質量%含有する水溶液を得た。これを撹拌しながら、15質量%のアンモニア水を添加し、pH9.5の白色スラリーを得た。このスラリーを濾過洗浄した後、純水に懸濁してTiO2として0.6質量%の水和酸化チタンゲルのスラリーとし、これに塩酸を加えてpH2とした後、オートクレーブに入れ、180℃で5時間、飽和蒸気圧下で水熱処理を行ってチタニアコロイド粒子(d1)を調製した。
次に、酸化物半導体膜(a3)と同様にして分光増感色素として、本発明の色素の吸着を行った。その後、光電気化学電池(a)と同様の方法で、光電気化学電池(d)を作製した。
方法を変えて酸化チタンの調製を行い、得られた酸化チタンから酸化物半導体膜を作製し、光電気化学電池とし、その評価を行った。
(1)熱処理法による酸化チタンの調製
(酸化チタン1(ブルーカイト型)等)
市販のアナターゼ型酸化チタン(石原産業社製、商品名ST-01)を用い、これを約900℃に加熱してブルーカイト型の酸化チタンに変換し、さらに約1,200℃に加熱してルチル型の酸化チタンとした。それぞれ順に、比較酸化チタン1(アナターゼ型)、酸化チタン1(ブルーカイト型)、比較酸化チタン2(ルチル型)とする。
(酸化チタン2(ブルーカイト型))
蒸留水954mlを還流冷却器付きの反応槽に装入し、95℃に加温する。撹拌速度を約200rpmに保ちながら、この蒸留水に四塩化チタン(Ti含有量:16.3質量%、比重1.59、純度99.9%)水溶液46mlを約5.0ml/minの速度で反応槽に滴下した。このとき、反応液の温度が下がらないように注意した。その結果、四塩化チタン濃度が0.25mol/リットル(酸化チタン換算2質量%)であった。反応槽中では反応液が滴下直後から、白濁し始めたがそのままの温度で保持を続け、滴下終了後さらに昇温し沸点付近(104℃)まで加熱し、この状態で60分間保持して完全に反応を終了した。
三塩化チタン水溶液(Ti含有量:28質量%、比重1.5、純度99.9%)を蒸留水で希釈し、チタン濃度換算で0.25モル/Lの溶液とした。このとき、液温が上昇しないよう氷冷して、50℃以下に保った。次に、この溶液を還流冷却器付きの反応槽に500ml投入し、85℃に加温しながらオゾンガス発生装置から純度80%のオゾンガスを1L/minでバブリングし、酸化反応を行なった。この状態で2時間保持し、完全に反応を終了した。得られたゾルをろ過、真空乾燥し、粉末とした。この粉末をX線回折法により定量分析した結果、(ブルーカイト型121面のピーク強度)/(三本が重なる位置でのピーク強度)比は0.85、(ルチル型のメインピーク強度)/(三本が重なる位置でのピーク強度)比は0であった。これらから求めると二酸化チタンは、ブルーカイト型が約98質量%、ルチル型が0質量%、アナターゼ型が0質量%であり、約2%は無定形であった。また、透過型電子顕微鏡でこの微粒子を観察したところ、1次粒子の平均粒径は0.05μmであった。
上記の方法で調製した酸化チタン1~3を半導体として特開2000-340269号公報記載の図1に示す構成の光電変換素子を用いた光電気化学電池を以下の方法で作製した。
ガラス基板上にフッ素ドープの酸化スズをコートし、導電性透明電極とした。電極面上にそれぞれの酸化チタン粒子を原料としたペーストを作成し、バーコート法で厚さ50μmに塗布した後、500℃で焼成して膜厚約20μmの薄層を形成した。
下記の表6に記載の濃度の色素のエタノール溶液を調製し、これに上記の酸化チタンの薄層を形成したガラス基板を浸漬し、12時間室温で保持した。その結果、酸化チタンの薄層上にこれらの色素を吸着させた。
電解液としてテトラプロピルアンモニウムのヨウ素塩とヨウ化リチウムのアセトニトリル溶液を用い、白金を対極として特開2000-340269号公報の図1に示す構成を有する光電変換素子を作製した。光電変換は160Wの高圧水銀ランプの光(フィルターで赤外線部をカット)を上記の素子に照射し、実験1と同様の方法で変換効率を測定した。その結果を表6に示す。
粒径の異なる酸化チタンを用いて、半導体微粒子が分散したペーストを作製した。これを用いて光電気化学電池を作製し、その特性を評価した。
[ペーストの調製]
(ペースト1)
球形のTiO2粒子(アナターゼ型、平均粒径;25nm、以下、球形TiO2粒子1という)とを硝酸溶液に入れて撹拌することによりチタニアスラリーを調製した。次に、チタニアスラリーに増粘剤としてセルロース系バインダーを加え、混練してペーストを調製した。
(ペースト2)
球形TiO2粒子1と、球形のTiO2粒子(アナターゼ型、平均粒径;200nm、以下、球形TiO2粒子2という)とを硝酸溶液に入れて撹拌することによりチタニアスラリーを調製した。次に、チタニアスラリーに増粘剤としてセルロース系バインダーを加え、混練してペースト(TiO2粒子1の質量:TiO2粒子2の質量=30:70)を調製した。
(ペースト3)
ペースト1に、棒状のTiO2粒子(アナターゼ型、直径;100nm、アスペクト比;5、以下、棒状TiO2粒子1という)を混合し、棒状TiO2粒子1の質量:ペースト1の質量=10:90のペーストを調製した。
(ペースト4)
ペースト1に、棒状TiO2粒子1を混合し、棒状TiO2粒子1の質量:ペースト1の質量=30:70のペーストを調製した。
(ペースト5)
ペースト1に、棒状TiO2粒子1を混合し、棒状TiO2粒子1の質量:ペースト1の質量=50:50のペーストを調製した。
(ペースト6)
ペースト1に、板状のマイカ粒子(直径;100nm、アスペクト比;6、以下、板状マイカ粒子1という)を混合し、板状マイカ粒子1の質量:ペースト1の質量=20:80のペーストを調製した。
(ペースト7)
ペースト1に、棒状のTiO2粒子(アナターゼ、直径;30nm、アスペクト比;6.3、以下、棒状TiO2粒子2という)を混合し、棒状TiO2粒子2の質量:ペースト1の質量=30:70のペーストを調製した。
(ペースト8)
ペースト1に、棒状のTiO2粒子(アナターゼ、直径;50nm、アスペクト比;6.1、以下、棒状TiO2粒子3という)を混合し、棒状TiO2粒子3の質量:ペースト1の質量=30:70のペーストを調製した。
(ペースト9)
ペースト1に、棒状のTiO2粒子(アナターゼ、直径;75nm、アスペクト比;5.8、以下、棒状TiO2粒子4という)を混合し、棒状TiO2粒子4の質量:ペースト1の質量=30:70のペーストを調製した。
(ペースト10)
ペースト1に、棒状のTiO2粒子(アナターゼ、直径;130nm、アスペクト比;5.2、以下、棒状TiO2粒子5という)を混合し、棒状TiO2粒子5の質量:ペースト1の質量=30:70のペーストを調製した。
(ペースト11)
ペースト1に、棒状のTiO2粒子(アナターゼ、直径;180nm、アスペクト比;5、以下、棒状TiO2粒子6という)を混合し、棒状TiO2粒子6の質量:ペースト1の質量=30:70のペーストを調製した。
(ペースト12)
ペースト1に、棒状のTiO2粒子(アナターゼ、直径;240nm、アスペクト比;5、以下、棒状TiO2粒子7という)を混合し、棒状TiO2粒子7の質量:ペースト1の質量=30:70のペーストを調製した。
(ペースト13)
ペースト1に、棒状のTiO2粒子(アナターゼ、直径;110nm、アスペクト比;4.1、以下、棒状TiO2粒子8という)を混合し、棒状TiO2粒子8の質量:ペースト1の質量=30:70のペーストを調製した。
(ペースト14)
ペースト1に、棒状のTiO2粒子(アナターゼ、直径;105nm、アスペクト比;3.4、以下、棒状TiO2粒子9という)を混合し、棒状TiO2粒子9の質量:ペースト1の質量=30:70のペーストを調製した。
以下に示す手順により、特開2002-289274号公報の図5に記載の光電極12と同様の構成を有する光電極を作製し、更に、光電極を用いて、当該光電極以外は色素増感型太陽電池20と同様の構成を有する10×10mmのスケールの光電気化学電池1を作製した。
ガラス基板上にフッ素ドープされたSnO2導電膜(膜厚;500nm)を形成した透明電極を準備した。このSnO2導電膜上に、上記のペースト2をスクリーン印刷し、次いで乾燥させた。その後、空気中、450℃の条件のもとで焼成した。更に、ペースト4を用いてこのスクリーン印刷と焼成とを繰り返すことにより、SnO2導電膜上に上記特許文献の図5に示す半導体電極2と同様の構成の半導体電極(受光面の面積;10mm×10mm、層厚;10μm、半導体層の層厚;6μm、光散乱層の層厚;4μm、光散乱層に含有される棒状TiO2粒子1の含有率;30質量%)を形成し、増感色素を含有していない光電極を作製した。
次に、対極として上記の光電極と同様の形状と大きさを有する白金電極(Pt薄膜の厚さ;100nm)、電解質Eとして、ヨウ素及びヨウ化リチウムを含むヨウ素系レドックス溶液を調製した。更に、半導体電極の大きさに合わせた形状を有するデュポン社製のスペーサS(商品名:「サーリン」)を準備し、特開2002-289274号公報の図3に示すように、光電極10と対極CEとスペーサSを介して対向させ、内部に上記の電解質を充填して光電気化学電池1を完成させた。
半導体電極の製造を以下のようにして行ったこと以外は、光電気化学電池1と同様の手順により特開2002-289274号公報記載の図1に示した光電極10を作製し、特開2002-289274号公報記載の図3に示した色素増感型太陽電池20と同様の構成を有する光電気化学電池2を作製した。ペースト2を半導体層形成用ペーストとして使用した。そして、SnO2導電膜上に、ペースト2をスクリーン印刷し、次いで乾燥させた。その後、空気中、450℃の条件のもとで焼成し、半導体層を形成した。ペースト3を光散乱層の最内部の層形成用ペーストとして使用した。また、ペースト5を光散乱層の最外部の層形成用ペーストとして使用した。そして、光電気化学電池1と同様にして半導体層上に光散乱層を形成した。そして、SnO2導電膜上に、特開2002-289274号公報記載の図1に示す半導体電極2と同様の構成の半導体電極(受光面の面積;10mm×10mm、層厚;10μm、半導体層の層厚;3μm、最内部の層の層厚;4μm、最内部の層に含有される棒状TiO2粒子1の含有率;10質量%、最外部の層の層厚;3μm、最内部の層に含有される棒状TiO2粒子1の含有率;50質量%)を形成し、増感色素を含有していない光電極を作製した。光電気化学電池1と同様に、光電極と対極CEとスペーサSを介して対向させ、内部に上記の電解質を充填して光電気化学電池2を完成させた。
半導体電極の製造に際して、ペースト1を半導体層形成用ペーストとして使用し、ペースト4を光散乱層形成用ペーストとして使用したこと以外は、光電気化学電池1と同様の手順により、特開2002-289274号公報の図5に示した光電極10を作製し、特開2002-289274号公報記載の図3に示した光電気化学電池20と同様の構成を有する光電気化学電池3を作製した。なお、半導体電極は、受光面の面積;10mm×10mm、層厚;10μm、半導体層の層厚;5μm、光散乱層の層厚;5μm、光散乱層に含有される棒状TiO2粒子1の含有率;30質量%であった。
半導体電極の製造に際して、ペースト2を半導体層形成用ペーストとして使用し、ペースト6を光散乱層形成用ペーストとして使用したこと以外は、光電気化学電池1と同様の手順により図5に示した光電極10及び特開2002-289274記載の図3に示した光電気化学電池20と同様の構成を有する光電極及び光電気化学電池4を作製した。なお、半導体電極は、受光面の面積;10mm×10mm、層厚;10μm、半導体層の層厚;6.5μm、光散乱層の層厚;3.5μm、光散乱層に含有される板状マイカ粒子1の含有率;20質量%であった。
半導体電極の製造に際して、ペースト2を半導体層形成用ペーストとして使用し、ペースト8を光散乱層形成用ペーストとして使用したこと以外は、光電気化学電池1と同様の手順により光電気化学電池5を作製した。なお、半導体電極の光散乱層に含有される棒状TiO2粒子3の含有率;30質量%であった。
半導体電極の製造に際して、ペースト2を半導体層形成用ペーストとして使用し、ペースト9を光散乱層形成用ペーストとして使用したこと以外は、光電気化学電池1と同様の手順により光電気化学電池6を作製した。なお、半導体電極の光散乱層に含有される棒状TiO2粒子4の含有率;30質量%であった。
半導体電極の製造に際して、ペースト2を半導体層形成用ペーストとして使用し、ペースト10を光散乱層形成用ペーストとして使用したこと以外は、光電気化学電池1と同様の手順により光電気化学電池7を作製した。なお、半導体電極の光散乱層に含有される棒状TiO2粒子5の含有率;30質量%であった。
半導体電極の製造に際して、ペースト2を半導体層形成用ペーストとして使用し、ペースト11を光散乱層形成用ペーストとして使用したこと以外は、光電気化学電池1と同様の手順により光電気化学電池8を作製した。なお、半導体電極の光散乱層に含有される棒状TiO2粒子6の含有率;30質量%であった。
半導体電極の製造に際して、ペースト2を半導体層形成用ペーストとして使用し、ペースト13を光散乱層形成用ペーストとして使用したこと以外は、光電気化学電池1と同様の手順により光電気化学電池9を作製した。なお、半導体電極の光散乱層に含有される棒状TiO2粒子8の含有率;30質量%であった。
半導体電極の製造に際して、ペースト2を半導体層形成用ペーストとして使用し、ペースト14を光散乱層形成用ペーストとして使用したこと以外は、光電気化学電池1と同様の手順により光電気化学電池10を作製した。なお、半導体電極の光散乱層に含有される棒状TiO2粒子9の含有率;30質量%であった。
半導体電極の製造に際して、ペースト2のみを用いて半導体層のみからなる半導体電極(受光面の面積;10mm×10mm、層厚;10μm、)を作製したこと以外は、光電気化学電池1と同様の手順により光電気化学電池11を作製した。
半導体電極の製造に際して、ペースト2を半導体層形成用ペーストとして使用し、ペースト7を光散乱層形成用ペーストとして使用したこと以外は、光電気化学電池1と同様の手順により光電極及び比較光電気化学電池12を作製した。なお、半導体電極の光散乱層に含有される棒状TiO2粒子2の含有率;30質量%であった。
光電気化学電池1~12について、ソーラーシミュレータ(WACOM製、WXS-85H(商品名))を用いて、AM1.5フィルターを通したキセノンランプから1000W/m2の疑似太陽光を照射した。I-Vテスターを用いて電流-電圧特性を測定し、変換効率を求めた。その結果を表7に示す。
金属酸化物微粒子に金属アルコキシドを加えスラリー状としたものを導電性基板に塗布し、その後、UVオゾン照射、UV照射又は乾燥を行い、電極を作製した。その後、光電気化学電池を作製し、変換効率を測定した。
金属酸化物微粒子としては、酸化チタンを用いた。酸化チタンは、質量比で、30%ルチル型及び70%アナターゼ型、平均粒径25nmのP25粉末(Degussa社製、商品名)を用いた。
金属酸化物微粒子をあらかじめ熱処理することで表面の有機物と水分を除去した。酸化チタン微粒子の場合は450℃のオーブンで大気下、30分間加熱した。
温度26℃、湿度72%の環境に保存しておいた酸化チタン、P25粉末(Degussa社製、商品名)に含まれる水分量を、熱重量測定における重量減少、及び300℃に加熱したときに脱着した水分量のカールフィッシャー滴定により定量した。
金属酸化物微粒子を結合する役割をする金属アルコキシドとしては、チタン原料としてはチタン(IV)テトライソプロポキシド(TTIP)、ジルコニウム原料としてはジルコニウム(IV)テトラn-プロポキシド、ニオブ原料としてはニオブ(V)ペンタエトキシド(全てAldrich社製)をそれぞれ用いた。
スズドープ酸化インジウム(ITO)導電膜付きポリエチレンテレフタレート(PET)フィルム基板(20Ω/cm2)又はフッ素ドープ酸化スズ(FTO)導電膜付きガラス基板(10Ω/cm2)に、スペーサとして粘着テープ2枚を一定間隔で平行に貼り付け、上記の方法に従って調製した各ペーストを、ガラス棒を用いて均一に塗布した。
ペーストを塗布後、色素吸着前に、UVオゾン処理、UV照射処理、又は乾燥処理の有無について条件を変えて多孔質膜を作製した。
導電性基板へ塗布した後の膜を大気中室温において2分程度で風乾した。この過程でペースト中の金属アルコキシドが大気中の水分によって加水分解を受け、Tiアルコキシド、Zrアルコキシド、Nbアルコキシドからそれぞれアモルファスの酸化チタン、酸化ジルコニウム、酸化ニオブが形成された。生成したアモルファス金属酸化物が、金属酸化物微粒子同士及び膜と導電性基板を接着する役割を果たすため、風乾するのみで機械的強度と付着性に優れた多孔質膜が得られた。
UVオゾン処理には日本レーザー電子社製のNL-UV253 UVオゾンクリーナーを用いた。UV光源には185nmと254nmに輝線を持つ4.5W水銀ランプ3個を備えており、試料を光源から約6.5センチの距離に水平に配置した。チャンバー中に酸素気流を導入することでオゾンが発生する。本実施例においてはこのUVオゾン処理を2時間行なった。なお、このUVオゾン処理によるITO膜及びFTO膜の導電性の低下は全く見られなかった。
チャンバー中を窒素置換して処理を行う以外は同様に、前記UVオゾン処理と同様に、2時間処理を行った。このUV処理によるITO膜及びFTO膜の導電性の低下はまったく見られなかった。
色素には表8記載の色素を用いて、各色素の0.1mMのエタノール溶液を調製した。本実験では上記のプロセスで作製した多孔質膜を100℃のオーブンで1時間乾燥した後に増感色素の溶液に浸漬し、そのまま室温で50分間放置して酸化チタン表面に色素を吸着させた。色素吸着後の試料はエタノールで洗浄し、風乾した。
色素吸着後の多孔質膜が形成された導電性基板を光電極とし、これと白金微粒子をスパッタリングにより修飾したITO/PETフィルム又はFTO/ガラス対極を対向させて、光電気化学電池を試作した。上記光電極の実効面積は約0.2cm2とした。電解質溶液には0.5MのLiI,0.05MのI2,0.5Mのt-ブチルピリジンを含む3-メトキシプロピオニトリルを用い、毛管現象によって両電極間のギャップに導入した。
溶媒としてアセトニトリルを用い、ヨウ化リチウム0.1mol/L、ヨウ素0.05mol/L、ヨウ化ジメチルプロピルイミダゾリウム0.62mol/Lを溶解した電解質溶液を調製した。ここに下記に示すNo.1~No.8のベンズイミダゾール系化合物をそれぞれ濃度0.5mol/Lになるように別々に添加し、溶解した。
ここにポリエチレンフィルム製のフレーム型スペーサー(厚さ25μm)をのせ、白金対電極でこれを覆い、光電変換素子を作製した。得られた光電変換素子に、Xeランプを光源として強度100mW/cm2の光を照射した。表9に得られた開放電圧と光電変換効率を示した。
(i)開放電圧は、7.0V以上のものを◎、6.5V以上7.0V未満のものを○、6.0V以上6.5V未満のものを△、6.0V未満のものを×として表示し、6.5V以上を合格とした。
(ii)変換効率が6.0%以上のものをA、5%以上6%未満のものをB、4%以上5%未満のものをC、3%以上4%未満のものをD、1.5%以上3%未満のものをE、1.5%未満のものをFとして表示し、変換効率D以上のものを合格とし、D未満のものを不合格とした。また、変換効率の初期値に対し700時間後の変換効率が90%以上のものをA、85%以上90%未満のものをB、80%以上85%未満のものをC、70%以上80%未満のものをD、70%未満のものをEとして評価し、変換効率の初期値に対し700時間後の変換効率が70%以上のものを合格とし、70%未満のものを不合格とした。
(光電気化学電池1)
以下に示す手順により、特開2004-152613号公報の図1に示した光電極10と同様の構成を有する光電極(ただし、半導体電極2を2層構造とした。)を作製し、更に、この光電極を用いた以外は特開2004-152613号公報の図1に示した色素増感型太陽電池20と同様の構成を有する光電気化学電池(半導体電極2の受光面F2の面積:1cm2)を作製した。なお、当該2層構造を有する半導体電極2の各層について、透明電極1に近い側に配置される層を「第1の層」、対極CEに近い側に配置される層を「第2の層」という。
液状電解質におけるヨウ化亜鉛の濃度を50mmol/Lとしたこと以外は、光電気化学電池1と同様の手順及び条件で光電気化学電池2を作製した。
液状電解質におけるヨウ化亜鉛の代わりにヨウ化リチウムを添加し、液状電解質におけるヨウ化リチウムの濃度を20mmol/Lとしたこと以外は、光電気化学電池1と同様の手順及び条件で比較光電気化学電池1を作製した。
液状電解質におけるヨウ化亜鉛の代わりにヨウ化リチウムを添加し、液状電解質におけるヨウ化リチウムの濃度を100mmol/Lとしたこと以外は、光電気化学電池1と同様の手順及び条件で比較光電気化学電池4を作製した。
以下の手順により、光電気化学電池1~4を用いた試料について、変換効率を測定した。
これに対して、比較色素を用いた場合には、変換効率の初期値も耐久性も合格レベルに到達することはできなかった。
1.二酸化チタン分散液の調製
内側をフッ素樹脂コーティングした内容積200mlのステンレス製容器に二酸化チタン微粒子(日本アエロジル(株)製,Degussa P-25)15g、水45g、分散剤(アルドリッチ社製、Triron X-100)1g、直径0.5mmのジルコニアビーズ(ニッカトー社製)30gを入れ、サンドグラインダーミル(アイメックス社製)を用いて1500rpmで2時間分散処理した。得られた分散液からジルコニアビーズを濾別した。得られた分散液中の二酸化チタン微粒子の平均粒径は2.5μmであった。なお粒径はMALVERN社製のマスターサイザーにより測定した。
フッ素をドープした酸化スズを被覆した20mm×20mmの導電性ガラス板(旭ガラス(株)製,TCOガラス-U,表面抵抗:約30Ω/m2)を準備し、その導電層側の両端(端から3mmの幅の部分)にスペーサー用粘着テープを張った後で、導電層上にガラス棒を用いて上記分散液を塗布した。分散液の塗布後、粘着テープを剥離し、室温で1日間風乾した。次にこの半導体塗布ガラス板を電気炉(ヤマト科学(株)製マッフル炉FP-32型)に入れ、450℃で30分間焼成した。半導体塗布ガラス板を取り出し冷却した後、表11に示す色素のエタノール溶液(濃度:3×10-4mol/L)に3時間浸漬した。色素が吸着した半導体塗布ガラス板を4-tert-ブチルピリジンに15分間浸漬した後、エタノールで洗浄し、自然乾燥させた。このようにして得られた色素増感酸化チタン微粒子層の厚さは10μmであり、酸化チタン微粒子の塗布量は20g/m2であった。また色素の吸着量は、その種類に応じて0.1~10mmol/m2の範囲内であった。
溶媒としては、アセトニトリルと3-メチル-2-オキサゾリジノンとの体積比90/10の混合物を用いた。この溶媒に、ヨウ素と電解質塩として、1-メチル-3-ヘキシルイミダゾリウムのヨウ素塩を加えて、0.5mol/Lの電解質塩および0.05mol/Lのヨウ素を含んだ溶液を調製した。この溶液に、(溶媒+窒素含有高分子化合物+塩)100質量部に対し、窒素含有高分子化合物(α)を10質量部加えた。さらに窒素含有高分子化合物の反応性窒素原子に対する求電子剤(β)を0.1モル混合し、均一な反応溶液とした。
(1)光電気化学電池b
前述のようにして本発明の色素により色素増感された酸化チタン微粒子層からなる電極A(20mm×20mm)を同じ大きさの白金蒸着ガラス板にスペーサーを介して重ねあわせた。次に両ガラス板の隙間に毛細管現象を利用して電解液(アセトニトリルと3-メチル-2-オキサゾリジノンとの体積比90/10の混合物を溶媒としたヨウ素0.05mol/L、ヨウ化リチウム0.5mol/Lの溶液)を浸透させて、光電気化学電池b-1(試料番号10-2)を作製した。また色素を表11に示すように変更した以外上記工程を繰り返すことにより、光電気化学電池b-2(試料番号10-5)を得た。
前述のようにして本発明の色素により色素増感された酸化チタン微粒子層からなる電極A(20mm×20mm)上に、電解液を塗布し、含浸させた。なお電解液は、ヘキサエチレングリコールメタクリル酸エステル(日本油脂化学(株)製,ブレンマーPE-350)1gと、エチレングリコール1gと、重合開始剤として2-ヒドロキシ-2-メチル-1-フェニル-プロパン-1-オン(日本チバガイギー(株)製,ダロキュア1173)20mgを含有した混合液に、ヨウ化リチウム500mgを溶解し10分間真空脱気することにより得た。次に前記混合溶液を含浸させた多孔性酸化チタン層を減圧下に置くことにより、多孔性酸化チタン層中の気泡を除き、モノマーの浸透を促した後、紫外光照射により重合して高分子化合物の均一なゲルを多孔性酸化チタン層の微細空孔内に充填した。このようにして得られたものをヨウ素雰囲気に30分間曝して、高分子化合物中にヨウ素を拡散させた後、白金蒸着ガラス板を重ね合わせ、光電気化学電池c-1(試料番号10-3)を得た。また色素を表10に示すように変更した以外上記工程を繰り返すことにより、光電気化学電池c-2(試料番号10-6)を得た。
500Wのキセノンランプ(ウシオ電機(株)製)の光をAM1.5フィルター(Oriel社製)およびシャープカットフィルター(Kenko L-42)を通すことにより、紫外線を含まない模擬太陽光とした。光強度は89mW/cm2とした。
窒素含有高分子α、求電子剤βは以下の化合物を示す。
これに対して、比較色素を用いた場合には、変換効率の初期値も耐久性も合格レベルに到達することはできなかった。
ゾル-ゲル法によって調整した懸濁液を用いてスクリーン印刷によりTiO2の多孔質層をFTOガラス上に塗布し450℃で焼成した。これを本発明の金属錯体色素YA-2(M=Sn)及び比較色素YB-1(M=Sn)の1×10-4mol/Lエタノール溶液中に浸漬することで、これらの色素を多孔質層に吸着させた。
次に、100mgの2,2’,7,7’-テトラキス(ジフェニルアミノ)-9,9’-スピロビフルオレンを5mlのクロロホルムに溶解した。上記の、金属錯体色素YA-2と比較色素YB-1が吸着された多孔質層に、このクロロホルム溶液を軽く塗布して、多孔質層の細孔内にしみこませた。次に溶液の一滴を直接表面に置いて室温で乾燥した。ついで被覆支持体を蒸着装置に装着して、約10-5ミリバールの真空下の熱蒸着によってさらに厚さ100nmの2,2’,7,7’-テトラキス(ジフェニルアミノ)-9,9’-スピロビフルオレンの層を形成した。さらに蒸着装置内でこの被覆支持体に対極として厚さ200nmの金の層を被覆した。
特開2000-90989の実施例1と同様に作製したタンデムセルにおいて、本発明の金属錯体色素YA-9(Zn)を用いた光電気化学電池と、比較色素YB-1(Zn)を用いた光電気化学電池を作製した。これらの光電気化学電池の変換効率を測定したところ、本発明の光電気化学電池の変換効率は、比較光電気化学電池に対し、50%大きな値を示し、優れた特性を示すことがわかった。
(1)多孔質半導体層のへイズ率の測定
チタンイソプロポキシド125mlを0.1Mの硝酸水溶液(キシダ化学株式会社製)750mlに滴下し、80℃で8時間加熱して、加水分解反応をさせることにより、ゾル液を調製した。得られたゾル液をチタン製オートクレーブにて250℃で15時間保持し、粒子成長させ、その後、超音波分散を30分間行うことにより、平均一次粒径20nmの酸化チタン粒子を含むコロイド溶液を得た。
第1層多孔質半導体層の酸化チタン膜を形成したガラス基板1の第1層多孔質半導体層上に、上記の酸化チタン懸濁液をドクターブレード法で塗布し、塗膜を得た。この塗膜を80℃で20分間予備乾燥し、さらに酸素雰囲気下、約500℃で60分間焼成し、第2層多孔質光電変換層5の第2層多孔質半導体層となる、膜厚が22μm程度の酸化チタン膜1を形成した。多孔質半導体層のへイズ率を測定したところ、84%であった。
吸収スペクトルにおける最大感度吸収波長領域を短波長側に有する色素(第1色素)として、下記のメロシアニン系色素S-2、R-1、R-7、R-8又はR-9をエタノールに溶解して、濃度3×10-4モル/リットルの第1色素の吸着用色素溶液を調製した。
上記の透明導電膜2と第1色素が吸着された多孔質半導体層3を具備したガラス基板1を、室温、常圧で第2色素の吸着用色素溶液に15分間浸漬させて、多孔質半導体層3に第2色素を吸着させた。その後、ガラス基板1を無水エタノールで数回洗浄し、約60℃で約20分間乾燥させた。ここで多孔質半導体層のへイズ率を測定したところ、83~85%だった。
市販の酸化チタン粒子(テイカ株式会社製、平均粒径20nm)4.0gとジエチレングリコールモノメチルエーテル20mLとを、硬質ガラスビーズを使用してペイントシェイカーにより6時間分散させて酸化チタン懸濁液を作成した。次いで、この酸化チタン懸濁液を、ドクターブレードを用いて、予め酸化スズ導電層を付着させたガラス板(電極層)に塗布し、100℃で30分予備乾燥した後、電気炉で500℃で40分間焼成し、ガラス板上に多孔質酸化チタン膜を形成した。これとは別に、本発明の色素をエタノールに溶解させた本発明の色素溶液と、同様に、比較色素をエタノールに溶解させた比較色素の色素溶液を得た。
(1)第1光電変換層の形成
市販の酸化チタン粒子(テイカ株式会社製、平均粒径30nm)4.0gとジエチレングリコールモノメチルエーテル20mlを硬質ガラスビーズを使用しペイントシェイカーにより6時間分散させ酸化チタン懸濁液を作成した。次いで、この酸化チタン懸濁液をドクターブレードを用いて、予め酸化スズ導電層が付着されたガラス板に塗布し、100℃で30分予備乾燥した後、電気炉で500℃で40分間焼成し、酸化チタン膜を得た。
市販の酸化ニッケル粒子(キシダ化学、平均粒径100nm)4.0gとジエチレングリコールモノメチルエーテル20mlをガラスビーズを使用しペイントシェイカーで8時間分散させ酸化ニッケル懸濁液とした。次いで、この酸化チタン懸濁液をドクターブレードを用いて、酸化スズ導電層が付着されたガラス板に塗布し、100℃で30分予備乾燥した後、300℃で30分間焼成し、酸化ニッケル膜を得た。
高分子電解質を用いた光電気化学電池を作製し、評価した。
酸化チタン膜を作製する塗液は、市販の酸化チタン粒子(テイカ株式会社社製、商品名AMT-600、アナターゼ型結晶、平均粒径30nm、比表面積50m2/g)4.0gとジエチレングリコールモノメチルエーテル20mlとをガラスビーズを使用し、ペイントシェイカーで7時間分散させ、酸化チタン懸濁液を調製した。この酸化チタン懸濁液をドクターブレードを用いて、11μm程度の膜厚、10mm×10mm程度の面積で、SnO2を透明導電膜としてガラス基板1上に作製された基板上に、透明導電膜側に塗布し、100℃で30分間予備乾燥した後、460℃で40分間酸素下で焼成し、その結果、膜厚が8μm程度の酸化チタン膜Aを作製した。
真空容器内にビーカーを設置し、その中に、酸化チタン膜Aと透明導電膜を具備した透明基板を入れ、ロータリーポンプで約10分間真空引きした。真空容器内を真空状態に保ちながら上記の単量体溶液をビーカー内に注入し、約15分間含浸させて、酸化チタン中に単量体溶液を十分に染み込ませた。ポリエチレン製セパレーター、PETフィルムと押さえ板を設置し冶具で固定した。その後、約85℃で30分間加熱することにより、熱重合させ、酸化チタン膜上に高分子化合物層を形成した。
その後、白金膜を具備した導電性基板を設置し、エポキシ系の封止剤にて周囲を封止し素子Aを作成した。
(光電変換素子の作製)
図1に示す光電変換素子を以下のようにして作製した。
ガラス基板上に、透明導電膜としてフッ素をドープした酸化スズをスパッタリングにより形成し、これをレーザーでスクライブして、透明導電膜を2つの部分に分割した。次に、水とアセトニトリルの容量比4:1からなる混合溶媒100mLにアナターゼ型酸化チタン(日本アエロジル社製のP-25(商品名))を32g配合し、自転/公転併用式のミキシングコンディショナーを使用して均一に分散、混合し、半導体微粒子分散液を得た。この分散液を透明導電膜に塗布し、500℃で加熱して受光電極を作製した。
次に、下記の表16に記載された色素(色素1のみ又は色素1と色素2が混合されたもの)のエタノール溶液に、上記の絶縁性多孔体が形成されたガラス基板を5時間浸漬した。色素の染着したガラスを4-tert-ブチルピリジンの10%エタノール溶液に30分間浸漬した後、エタノールで洗浄し自然乾燥させた。このようにして得られた感光層の厚さは10μmであり、半導体微粒子の塗布量は20g/m2であった。電解液は、ヨウ化ジメチルプロピルイミダゾリウム(0.5モル/L)、ヨウ素(0.1モル/L)のメトキシプロピオニトリル溶液を用いた。
500Wのキセノンランプ(ウシオ電機社製)の光をAM1.5Gフィルター(Oriel社製)およびシャープカットフィルター(KenkoL-42、商品名)を通すことにより紫外線を含まない模擬太陽光を発生させた。この光の強度は89mW/cm2であった。作製した光電変換素子にこの光を照射し、発生した電気を電流電圧測定装置(ケースレー238型、商品名)にて測定した。これにより求められた光電気化学電池の変換効率を測定した結果を下記の表16に示した。結果は、変換効率が7.5%以上のものを◎、7.3%以上7.5%未満のものを○、7.1%以上7.3%未満のものを△、7.1%未満のものを×として評価し、7.3%以上のものを合格とした。
1.二酸化チタン分散液の調製
内側をフッ素樹脂コーティングした内容積200mLのステンレス製容器に二酸化チタン微粒子(日本アエロジル(株)製,Degussa P-25)15g、水45g、分散剤(アルドリッチ社製、Triron X-100)1g、直径0.5mmのジルコニアビーズ(ニッカトー社製)30gを入れ、サンドグラインダーミル(アイメックス社製)を用いて1500rpmで2時間分散処理した。得られた分散液からジルコニアビーズを濾別した。得られた分散液中の二酸化チタン微粒子の平均粒径は2.5μmであった。なお粒径はMALVERN社製のマスターサイザー(商品名)により測定した。
フッ素をドープした酸化スズを被覆した縦20mm、横20mmの導電性ガラス板(旭ガラス(株)製,TCOガラス-U,表面抵抗:約30Ω/m2)を準備し、その導電層側の両端(端から3mmの幅の部分)にスペーサー用粘着テープを張った後で、導電層上にガラス棒を用いて上記分散液を塗布した。分散液の塗布後、粘着テープを剥離し、室温で1日間風乾した。次にこの半導体塗布ガラス板を電気炉(ヤマト科学(株)製マッフル炉FP-32型)に入れ、450℃で30分間焼成した。半導体塗布ガラス板を取り出し冷却した後、表17に示す色素のエタノール溶液(濃度:1×10-4mol/L)に3時間浸漬した。色素が吸着した半導体塗布ガラス板を4-tert-ブチルピリジンに15分間浸漬した後、エタノールで洗浄し、自然乾燥させて、色素を吸着した酸化チタン微粒子層(電極A)を得た。電極Aの色素増感酸化チタン微粒子層の厚さは10μmであり、酸化チタン微粒子の塗布量は20g/m2であった。また色素の吸着量は、その種類に応じて0.1~10mmol/m2の範囲内であった。
上述のように作製した色素増感電極A(縦20mm、横20mm)をこれと同じ大きさの白金蒸着ガラスと重ね合わせた。次に、両ガラスの隙間に毛細管現象を利用して電解質組成物を染み込ませ、電解質を酸化チタン電極中に導入した。これにより、図1に示すように、導電性ガラスからなる導電性支持体(ガラスの透明基板上に導電層が設層されたもの)、感光体、電荷移動体、白金からなる対極及びガラスの透明基板を順に積層しエポキシ系封止剤で封止した光電気化学電池を作製した。ただし、電解質組成物の粘度が高く毛細管現象を利用して電解質組成物を染み込ませることが困難な場合は、電解質組成物を50℃に加温し、これを酸化チタン電極に塗布した後、この電極を減圧下に置き電解質組成物が十分浸透し電極中の空気が抜けた後、白金蒸着ガラス(対極)を重ね合わせて同様に光電気化学電池を作製した。
500Wのキセノンランプ(ウシオ電機(株)製)の光をAM1.5フィルター(Oriel社製)及びシャープカットフィルター(Kenko L-37)ことにより紫外線を含まない模擬太陽光を発生させた。この光の強度は70mW/cm2であった。この模擬太陽光を、50℃で色素増感太陽電池に照射し、発生した電気を電流電圧測定装置(ケースレーSMU238型)で測定した。また、85℃で1000時間暗所保存後の変換効率の低下率及び500時間連続光照射後の変換効率の低下率も測定した。これらの結果を表16に示す。変換効率が6.0%以上のものをA、5%以上6%未満のものをB、4%以上5%未満のものをC、3%以上4%未満のものをD、1.5%以上3%未満のものをE、1.5%未満のものをFとして表示し、変換効率D以上のものを合格とし、D未満のものを不合格とした。
下記の方法に従って、光電気化学電池を作製し、評価した。その結果を表18に示す。
(1)透明導電性支持体の作製
感光性電極用支持体として、表面がフッ素コートされた厚さ0.4mmのシートの片面に、導電性の酸化スズの薄膜を厚さ200nmで均一にコーティングして可撓性のある透明導電性支持体を使用した。
厚さ0.4mmのポリイミド製カプトン(登録商標)フィルムの片面に、真空スパッタリング法によって厚さ300nmの白金膜で均一に被覆した。面抵抗は5Ω/cm2であった。
C.J.BarbeらのJ.Am.Ceramic Soc.80巻、p.3157の論文に記載の製造方法に従い、チタン原料にチタニウムテトライソプロポキシドを用い、オートクレーブ中での重合反応の温度を230℃に設定して、二酸化チタン濃度11質量%のアナターゼ型二酸化チタンの分散液を合成した。得られた二酸化チタン粒子の一次粒子のサイズは10~30nmであった。得られた分散液を、超遠心分離機にかけて、粒子を分離し、凝集物を乾燥した後、メノウ乳鉢上で粉砕して白色粉末の半導体微粒子aを得た。水とアセトニトリルの容量比4:1からなる混合溶媒100ccに、半導体微粒子aを溶媒100ccあたり32gの濃度で添加し、自転/公転併用式のミキシングコンディショナーを使って均一に分散、混合した。この結果、得られた白色の半導体微粒子分散液は、50~150N・s/m2の高粘度のペースト状となり、このまま塗布に用いるのに適した液物性をもっていることがわかった。試料番号19-3及び19-10は、平均分子量が50万のポリエチレングリコール(PEG)の粉末を、溶媒100cc当たり7.7g配合した。その他の半導体微粒子分散液には、半導体微粒子以外の固形分は加えなかった。
厚さ1.9mmの無アルカリガラスの基板に分散液をアプリケーターで塗布し、40~70μmの厚さで塗布し、室温で1時間乾燥させた。その後、空気中、350℃で0.5時間加熱し、加熱前後の重量変化を測定したところ、前記試料番号19-3及び19-10の半導体微粒子以外の固形分含量は1%であった。それ以外試料の半導体微粒子以外の固形分含量は、0.3%であった。
(1)で用意した透明導電性支持体に、(3)で調製した分散液をアプリケータで塗布し、室温下で1時間乾燥させることにより、40~70μmの均一な厚さの塗布層を形成した。さらに、この塗布層を表12記載の条件で処理して、色素増感のための多孔質半導体微粒子層を作製した。多孔質半導体微粒子層の最終的な平均膜厚は、いずれも6~7μmであった。
表18に示した色素を乾燥したアセトニトリル:t-ブタノール:エタノールを体積比で2:1:1の混合溶媒に、色素濃度が1×10-4モル/リットルとなるように溶解した。この色素溶液に添加剤として、p-C9H19-C6H4-O-(CH2CH2-O)3-(CH2)4-SO3Naの構造の有機スルホン酸誘導体を0.025モル/リットルの濃度となるように溶解して、色素吸着用溶液を調製した。
上記の多孔質半導体微粒子層を塗設した基板を、上記の吸着用色素溶液に浸漬して、攪拌下40℃で3時間放置した。
このようにして半導体微粒子層に色素を吸着させ、感光層に用いる色素増感電極(感光性電極)を作製した。
色素吸着した多孔質半導体微粒子層をかき落として、受光面積1.0cm2(直径約1.1cm)の円型の感光性電極を形成した。この電極に対して、対極の白金蒸着ガラス基板を、熱圧着性のポリエチレンフイルム製のフレーム型スペーサー(厚さ20μm)を挿入して重ね合わせ、スペーサー部分を120℃に加熱し両基板を圧着した。さらにセルのエッジ部をエポキシ樹脂接着剤でシールした。対極の基板のコーナー部にあらかじめ設けた電解液注液用の小孔を通して、電解液として、表18記載のイミダゾリウムイオンE1~E4/ヨウ素=50:1(質量比)の組成から成る室温溶融塩を基板の小孔から毛細管現象を利用して電極間の空間にしみこませた。E1~E4としては、以下のものを使用した。
E1:1,2-ジメチル-3-プロピルイミダゾリウムヨージド
E2:1-ブチルー3-メチルイミダゾリウムヨージド
E3:1-メチルー3-プロピルイミダゾリウムヨージド
E4:1,3-ジ(2-(2-(2-メトキシエトキシ)エトキシ)エチル)イミダゾリウムヨージド
以上のセル組立工程と、電解液注入の工程をすべて上記の露点-60℃の乾燥空気中で実施した。溶融塩の注入後、真空下でセルを数時間吸引し感光性電極および溶融塩を含めたセル内部の脱気を行い、最終的に小孔を低融点ガラスで封じた。これにより、導電性支持体、色素が吸着された多孔質半導体微粒子電極(感光性電極)、電解液、対極および支持体が順に積層された光電気化学電池を作製した。
500Wのキセノンランプ(ウシオ電機社製)に太陽光シミュレーション用補正フィルター(Oriel社製AM1.5direct(商品名))を装着し、上記色素増感太陽電池に対し、入射光強度が100mW/cm2の模擬太陽光を、多孔質半導体微粒子電極(感光性電極)の側から照射した。素子は恒温装置のステージ上に密着して固定し、照射中の素子の温度を50℃に制御した。電流電圧測定装置(ケースレー社製ソースメジャーユニット238型(商品名))を用いて、素子に印加するDC電圧を10mV/秒の定速でスキャンし、素子の出力する光電流を計測することにより、光電流-電圧特性を測定した。これにより求められた上記の各種素子のエネルギー変換効率(η)を、セルの構成要素(半導体微粒子、増感色素)の内容とともに表18に記載した。24時間連続光照射後の変換効率の低下率も測定した。これらの結果を表18に示す。変換効率が4.0%以上のものをA、3.5%以上4%未満のものをB、3%以上3.5%未満のものをC、2.5%以上3%未満のものをD、2.0%以上2.5%未満のものをE、2.0%未満のものをFとして表示し、変換効率D以上のものを合格とし、D未満のものを不合格とした。
実験18のエポキシ系封止剤として、エピコート828((商品名)、ジャパンエポキシレジン社製)、硬化剤及びプラスチックペーストからなる樹脂組成物中に直径25μmのガラス球体がほぼ均一に分散された封止剤ペーストを用いたこと以外は同様にして、光電気化学電池を作製し、光電変換効率の測定を行った。
これにより求めた各色素増感太陽学電池の変換効率(η)、85℃で1000時間暗所保存後の変換効率の低下率、及び500時間連続光照射後の変換効率の低下率を表19に示す。変換効率が6.0%以上のものをA、5%以上6%未満のものをB、4%以上5%未満のものをC、3%以上4%未満のものをD、1.5%以上3%未満のものをE、1.5%未満のものをFとして表示し、変換効率D以上のものを合格とし、D未満のものを不合格とした。
2 感光体層
21 色素
22 半導体微粒子
3 電荷移動体層
4 対極
5 受光電極
6 回路
10 光電変換素子
100 光電気化学電池
Claims (15)
- 下記一般式(1)で規定される構造を有し、1又は2つの酸性基を有することを特徴とする金属錯体色素。
- 前記酸性基がカルボキシル基である請求項1記載の金属錯体色素。
- 酸性基が前記一般式(1)におけるA又はCのいずれか一方に有する請求項1又は2記載の金属錯体色素。
- 前記一般式(9)~(11)において、R67、R68、R71、R72、R75及びR76から選ばれた1つ又は2つの基が、酸性基又は酸性基を有する基である請求項6又は7記載の金属錯体色素。
- 前記酸性基を有する構造が、酸性基の結合する原子上にさらに電子吸引基を有する請求項1~8のいずれか1項記載の金属錯体色素。
- 前記一般式(9)~(11)において、R71及び/又はR72が、前記一般式(12)の構造の酸性基を有する請求項6~10のいずれか1項記載の金属錯体色素。
- 請求項1~11のいずれか1項記載の構造を有する金属錯体色素と半導体微粒子とを有する感光体層を具備する光電変換素子。
- 前記色素が、請求項1~11のいずれか1項記載の金属錯体色素に、さらにほかの色素を含有する請求項12記載の光電変換素子。
- 前記のほかの色素が、下記一般式(13)で表される構造を有する請求項13記載の光電変換素子。
Mz(LL1)m1(LL2)m2(X)m3・CI 一般式(13)
[ 一般式(13)において、Mzは金属原子を表し、LL1は下記一般式(14)で表される2座又は3座の配位子であり、LL2は下記一般式(15)で表される2座又は3座の配位子である。
Xはアシルオキシ基、アシルチオ基、チオアシルオキシ基、チオアシルチオ基、アシルアミノオキシ基、チオカルバメート基、ジチオカルバメート基、チオカルボネート基、ジチオカルボネート基、トリチオカルボネート基、アシル基、チオシアネート基、イソチオシアネート基、シアネート基、イソシアネート基、シアノ基、アルキルチオ基、アリールチオ基、アルコキシ基およびアリールオキシ基からなる群から選ばれた基で配位する1座又は2座の配位子、あるいはハロゲン原子、カルボニル、ジアルキルケトン、1,3-ジケトン、カルボンアミド、チオカルボンアミドまたはチオ尿素からなる1座または2座の配位子を表す。
m1は0~3の整数を表し、m1が2以上のとき、LL1は同じでも異なっていてもよい。m2は0~3の整数を表し、m2が2のとき、LL2は同じでも異なっていてもよい。ただし、m1とm2のうち少なくとも一方は1以上の整数である。
m3は0~2の整数を表し、m3が2のとき、Xは同じでも異なっていてもよく、X同士が連結していてもよい。
CIは一般式(13)において、電荷を中和させるのに対イオンが必要な場合の対イオンを表す。]
L1及びL2はそれぞれ独立に、エテニレン基、エチニレン基、アリーレン基、ヘテロアリーレン基から選ばれた少なくとも1種を含む共役鎖を表す。L1及びL2はそれぞれ独立に、結合しているピリジン環と共役している。
a1及びa2はそれぞれ独立に0~3の整数を表し、a1が2以上のときR101は同じでも異なっていてもよく、a2が2以上のときR102は同じでも異なっていてもよく、b1及びb2はそれぞれ独立に0~3の整数を表す。b1が2以上のときR103は同じでも異なっていてもよく、R103は互いに連結して環を形成してもよく、b2が2以上のときR104は同じでも異なっていてもよく、R104は互いに連結して環を形成してもよい。b1及びb2が共に1以上のとき、R103とR104が連結して環を形成してもよい。d3は0又は1を表す。
- 請求項12~14のいずれか1項記載の光電変換素子を備える光電気化学電池。
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JP2012062256A (ja) * | 2010-09-14 | 2012-03-29 | Yamamoto Chem Inc | ジテトラアザポルフィリン系化合物、該化合物を用いた色素増感太陽電池 |
JP2012167189A (ja) * | 2011-02-14 | 2012-09-06 | Aisin Seiki Co Ltd | フタロシアニン誘導体、フタロシアニン誘導体の製造方法および色素増感型太陽電池 |
CN111430549A (zh) * | 2020-03-24 | 2020-07-17 | 杭州纤纳光电科技有限公司 | 一种钙钛矿太阳能电池及其制备方法 |
KR20220134335A (ko) * | 2021-03-26 | 2022-10-05 | 울산과학기술원 | 페로브스카이트 태양전지 코팅용 유기금속 복합체 및 이를 이용한 초음파 스프레이 코팅 방법 |
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CN104230944B (zh) * | 2014-09-30 | 2017-01-18 | 深圳华润九新药业有限公司 | 二酞菁锌配合物及其制备方法和应用 |
EP3352185B1 (en) * | 2015-09-17 | 2021-10-27 | FUJIFILM Corporation | Photoelectric conversion element, dye-sensitized solar cell, dye composition, and oxide semiconductor electrode |
CN109273287B (zh) * | 2018-08-17 | 2020-07-07 | 同济大学 | 一种自愈合水凝胶聚电解质及其制备与应用 |
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JP2000353553A (ja) * | 1999-06-10 | 2000-12-19 | Fuji Photo Film Co Ltd | 光電変換素子および光電池 |
WO2010050574A1 (ja) * | 2008-10-29 | 2010-05-06 | 富士フイルム株式会社 | 光電気化学電池 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012062256A (ja) * | 2010-09-14 | 2012-03-29 | Yamamoto Chem Inc | ジテトラアザポルフィリン系化合物、該化合物を用いた色素増感太陽電池 |
JP2012167189A (ja) * | 2011-02-14 | 2012-09-06 | Aisin Seiki Co Ltd | フタロシアニン誘導体、フタロシアニン誘導体の製造方法および色素増感型太陽電池 |
CN111430549A (zh) * | 2020-03-24 | 2020-07-17 | 杭州纤纳光电科技有限公司 | 一种钙钛矿太阳能电池及其制备方法 |
CN111430549B (zh) * | 2020-03-24 | 2023-02-21 | 杭州纤纳光电科技有限公司 | 一种钙钛矿太阳能电池及其制备方法 |
KR20220134335A (ko) * | 2021-03-26 | 2022-10-05 | 울산과학기술원 | 페로브스카이트 태양전지 코팅용 유기금속 복합체 및 이를 이용한 초음파 스프레이 코팅 방법 |
KR102579534B1 (ko) | 2021-03-26 | 2023-09-18 | 울산과학기술원 | 페로브스카이트 태양전지 코팅용 유기금속 복합체 및 이를 이용한 초음파 스프레이 코팅 방법 |
Also Published As
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CN103052689A (zh) | 2013-04-17 |
CN103052689B (zh) | 2016-04-27 |
JPWO2012017871A1 (ja) | 2013-10-03 |
JP5681716B2 (ja) | 2015-03-11 |
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