JP2016196423A - Novel compound and dye-sensitized photoelectric conversion element using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a compound having a specific structure, a photoelectric conversion element using semiconductor fine particles sensitized with the compound, and a solar cell.SOLUTION: The compound is represented by formula (1) (where m represents an integer of 1-3; n represents an integer of 0-6; X, Xand Xeach independently represent an oxygen atom, a sulfur atom, a selenium atom or a tellurium atom; Yand Yeach independently represent a hydrogen atom, an aromatic residue, an aliphatic hydrocarbon residue or the like; Aand Aeach independently represent a phenyl group, a naphthyl group or the like; Aand Aeach independently represent a hydrogen atom, an aliphatic hydrocarbon residue or the like; and A, Aand Aeach independently represent a hydrogen atom, an aromatic residue, an aliphatic hydrocarbon residue or the like).SELECTED DRAWING: None

Description

  The present invention relates to a novel compound, a photoelectric conversion element having a thin film of semiconductor fine particles sensitized with the compound, and a solar cell using the same, and more specifically, a compound (dye) having a specific structure in a thin film of oxide semiconductor fine particles. The present invention relates to a supported photoelectric conversion element and a solar cell using the photoelectric conversion element.

  Solar cells that use sunlight as an energy resource to replace fossil fuels such as oil and coal are drawing attention. Currently, active studies are being made on silicon solar cells using crystalline or amorphous silicon, or compound semiconductor solar cells using gallium, arsenic, or the like. However, since they require high energy and cost for production, they are difficult to use for general purposes. A photoelectric conversion element using semiconductor fine particles sensitized with a dye or a solar cell using the same is also known, and a material and a manufacturing technique for producing the photoelectric conversion element are disclosed (Patent Document 1, Non-Patent Document). 1, see non-patent document 2). This photoelectric conversion element is manufactured using a relatively inexpensive oxide semiconductor such as titanium oxide, and there is a possibility that a photoelectric conversion element having a lower cost than a conventional solar cell using silicon or the like can be obtained. Attention has been focused on the fact that solar cells can be obtained. However, the ruthenium complex itself used as a sensitizing dye for obtaining an element with high conversion efficiency is expensive, and a problem remains in its stable supply. On the other hand, attempts have been made to use organic dyes as sensitizing dyes, but problems such as low conversion efficiency, stability and durability of photoelectric conversion elements using the dyes have been sufficiently solved. Therefore, the present situation is that it has not been put into practical use, and further improvement in conversion efficiency is desired (see Patent Document 2).

Japanese Patent No. 2664194 WO2002 / 011213

B.O'Regan and M.Graetzel Nature, 353, 737 (1991) MKNazeeruddin, A. Kay, I. Rodicio, R. Humphry-Baker, E. Muller, P. Liska, N. Vlachopoulos, M. Graetzel, J. Am. Chem. Soc., 115, 6382 (1993) Year)

  In photoelectric conversion elements using oxide semiconductor fine particles sensitized with an organic dye, development of photoelectric conversion elements that are inexpensive and have high durability and high conversion efficiency is required.

As a result of diligent efforts to solve the above-mentioned problems, the present inventors sensitized a thin film of semiconductor fine particles using a novel compound having a specific structure, and created a photoelectric conversion element, thereby improving durability and conversion efficiency. The present inventors have found that a photoelectric conversion element having a high thickness can be obtained, and have completed the present invention.
That is, the present invention
(1) The following formula (1)

(In the formula (1), m represents an integer of 1 to 3, and n represents an integer of 0 to 6. X ₁ , X ₂ and X ₃ are each independently an oxygen atom, sulfur atom, selenium atom or tellurium atom. When m is 2 or more and a plurality of X ₃ are present, each X ₃ may be the same or different from each other Y ₁ and Y ₂ are each independently a hydrogen atom, aromatic residue, aliphatic carbonization Represents a hydrogen residue, carboxyl group, phosphoric acid group, sulfonic acid group, cyano group, acyl group, amide group, alkoxycarbonyl group or sulfonylbenzene group, and Y ₁ and Y ₂ combine to form a ring. A ₁ and A ₂ each independently represent a hydrogen atom, a phenyl group, a naphthyl group or an aliphatic hydrocarbon residue, A ₃ and A ₄ each independently represent a hydrogen atom, an aliphatic hydrocarbon residue, Cyano group, halogen atom, amide group, alkoxy Group, alkoxycarbonyl group or if .m representing the acyl group is A ₃ and A ₄ are a plurality exist in two or more, each A ₃ may be the same or different from each other, or each of A ₄ are the same as each other or A ₅ , A ₆ and A ₇ are each independently a hydrogen atom, aromatic residue, aliphatic hydrocarbon residue, cyano group, halogen atom, amide group, substituted or unsubstituted amino group, alkoxy group Represents an aryloxy group, an alkoxycarbonyl group, an arylcarbonyl group or an acyl group, and when n is 2 or more and a plurality of A ₅ and A ₆ are present, each A ₅ may be the same as or different from each other. A ₆ may be the same or different from each other.)
(2) The following formula (2)

(In the formula (2), m, X ₁ , X ₂ , X ₃ , Y ₁ , Y ₂ , A ₃ , A ₄ and A ₇ represent the same meaning as in the formula (1). Independently represents an integer of 0 to 3. R ₂ and R ₃ each independently represent a hydrogen atom, an aliphatic hydrocarbon residue, a cyano group, a halogen atom, an amide group, a substituted or unsubstituted amino group, an alkoxy group, an aryloxy group A group, an alkoxycarbonyl group, an arylcarbonyl group or an acyl group, when p is 2 or more and a plurality of R ₂ are present, each R ₂ may be the same as or different from each other, q is 2 or more and R ₃ is In the case where a plurality of R ₃ are present, each R ₃ may be the same as or different from each other.)
(3) The compound according to item (2), wherein p and q are 1, and R ₂ and R ₃ are each independently an aliphatic hydrocarbon residue, an alkoxy group, or a substituted or unsubstituted amino group,
(4) R ₂ and R ₃ are each independently an amino group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an amino group having two substituted alkyl groups having 1 to 6 carbon atoms (3 ),
(5) The compound according to any one of (1) to (4), wherein m is 1 or 2.
(6) The compound according to any one of (1) to (5), wherein X ₁ , X ₂ and X ₃ are sulfur atoms,
(7) The compound according to any one of (1) to (6), wherein one of Y ₁ and Y ₂ is a carboxyl group and the other is a carboxyl group, a cyano group, or an acyl group,
(8) The compound according to item (7), wherein _one of Y ₁ and Y ₂ is a carboxyl group and the other is a cyano group,
(9) The compound according to any one of (1) to (8), wherein A ₃ , A ₄ and A ₇ are hydrogen atoms,
(10) The following formula (100), (101), (102) or (103)

The compound according to item (1), which is represented by:
(11) A photoelectric conversion element in which a compound represented by the formula (1) described in (1) above is supported on a thin film of oxide semiconductor fine particles provided on a substrate,
(12) A solar cell including the photoelectric conversion element according to (11) above,
About.

  By using the compound of the present invention as a sensitizing dye, a solar cell having excellent conversion efficiency can be provided.

The present invention is described in detail below.
The compound of the present invention has a structure represented by the following formula (1). The structural feature of the compound represented by the formula (1) is that [1] benzochalcogeno [3,2-b] [1] benzochalcogenophene derivatives have an amino group, an aryl-substituted amino group or an alkyl-substituted amino group at the terminal. Photoelectric conversion provided with a thin film of oxide semiconductor fine particles carrying both the amino group such as a group and a thiophene ring residue having an alkenyl group such as a vinyl group and carrying the compound (sensitizing dye) The element has high conversion efficiency and excellent durability. The compound represented by Formula (1) is demonstrated below.

In the formula (1), m represents an integer of 1 to 3, preferably 1 to 3, and more preferably 1 or 2.
In formula (1), n represents an integer of 0 to 6, is preferably an integer of 0 to 2, and is more preferably 0.
In the formula (1), X ₁ , X ₂ and X ₃ each independently represent an oxygen atom, a sulfur atom, a selenium atom or a tellurium atom, and each independently preferably a sulfur atom, a selenium atom or a tellurium atom, each independently More preferably a sulfur atom or a selenium atom, still more preferably a sulfur atom.
When m is 2 or more and a plurality of X ₃ are present, each X ₃ may be the same as or different from each other.

In formula (1), Y ₁ and Y ₂ are each independently a hydrogen atom, an aromatic residue, an aliphatic hydrocarbon residue, a carboxyl group, a phosphoric acid group, a sulfonic acid group, a cyano group, an acyl group, an amide group, An alkoxycarbonyl group or a sulfonylbenzene group is represented.
The aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) means an aromatic ring or a group obtained by removing one hydrogen atom from a condensed ring including an aromatic ring, and the aromatic residue has a substituent. You may have. Specific examples of the aromatic ring include aromatic hydrocarbon rings such as benzene, naphthalene, anthracene, phenanthrene, pyrene, perylene, indene, azulene and terylene, pyridine, pyrazine, pyrimidine, pyrazole, pyrazolidine, thiazolidine, oxazolidine, pyran, and chromene. , Pyrrole, pyrrolidine, benzimidazole, imidazoline, imidazolidine, imidazole, triazole, triazine, diazole, indoline, thiophene, thienothiophene, furan, oxazole, oxadiazole, thiazine, thiazole, indole, benzothiazole, benzothiadiazole, naphthothiazole , Heteroaromatic rings such as benzoxazole, naphthoxazole, indolenine, benzoindolenine, quinoline and quinazoline, Condensed aromatic ring such as Ren and carbazole, and the like, is preferably a group obtained by removing one hydrogen atom from a condensed ring containing an aromatic ring or aromatic ring having 4 to 20 carbon atoms.

There is no particular limitation on the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} Formula (1) may have, but for example, a sulfonic acid group, a sulfamoyl group, a cyano group, an isocyano group, a thiocyanato group, Isothiocyanato group, nitro group, nitrosyl group, halogen atom, hydroxyl group, phosphate group, phosphate ester group, substituted or unsubstituted amino group, mercapto group, amide group, alkoxy group, aryloxy group, carboxyl group, carbamoyl group, Examples include acyl groups, aldehyde groups, substituted carbonyl groups such as alkoxycarbonyl groups and arylcarbonyl groups, and aromatic residues and aliphatic hydrocarbon residues.
Examples of the halogen atom as the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} Formula (1) may have include fluorine, chlorine, bromine, iodine, and the like. Atoms are preferred.
Examples of the phosphate ester group as a substituent that the aromatic residue represented by Y ₁ and Y _{2 in} Formula (1) may have include a phosphoric acid (having 1 to 4 carbon atoms) alkyl ester group. Preferred examples are a methyl phosphate group, an ethyl phosphate group, a phosphoric acid (n-propyl) group, and a phosphoric acid (n-butyl) group.

Examples of the substituted or unsubstituted amino group as the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} Formula (1) may have include an amino group, a mono- or dimethylamino group, a mono- or diethylamino group, An alkyl-substituted amino group such as a mono or di (n-propyl) amino group, a mono or di (n-butyl) amino group, a mono or diphenylamino group, a mono or dinaphthylamino group, a mono or difluorenylamino group, Aromatic substituted amino groups such as mono- or difuranylamino group, mono- or dithiophenylamino group, mono- or dipyridylamino group, mono- or dipyrrolylamino group, alkyl groups such as monoalkylmonophenylamino group and aromatic residues are substituted one by one Preferred amino group or benzylamino group, acetylamino group, phenylacetylamino group, etc. Examples include diethylamino group, di (n-propyl) amino group, di (n-butyl) amino group, dihexylamino group, diphenylamino group, di (4-alkyl) phenylamino group, di (4-alkoxy) phenylamino. Group, difluorenylamino group and the like.
Examples of the mercapto group as a substituent which the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have include a mercapto group and an alkyl mercapto group, specifically a methyl mercapto group. Alkyl mercapto group having 1 to 4 carbon atoms such as ethyl mercapto group, n-propyl mercapto group, isopropyl mercapto group, n-butyl mercapto group, isobutyl mercapto group, sec-butyl mercapto group and t-butyl mercapto group, or phenyl A mercapto group etc. are mentioned.

Examples of the amide group as a substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have include an amide group, an acetamido group, and an alkylamide group. Group, acetamide group, N-methylamide group, N-ethylamide group, N- (n-propyl) amide group, N- (n-butyl) amide group, N-isobutyramide group, N- (sec-butylamide) group, N- (t-butyl) amide group, N, N-dimethylamide group, N, N-diethylamide group, N, N-di (n-propyl) amide group, N, N-di (n-butyl) amide group N, N-diisobutyramide group, N-methylacetamide group, N-ethylacetamide group, N- (n-propyl) acetamide group, N- (n-butyl) acetamide group, N-isobutylacetamide group N- (sec-butyl) acetamide group, N- (t-butyl) acetamide group, N, N-dimethylacetamide group, N, N-diethylacetamide group, N, N-di (n-propyl) acetamide group, N, N-di (n-butyl) acetamide group, N, N-diisobutylacetamide group are mentioned, and arylamide group, specifically preferably phenylamide group, naphthylamide group, phenylacetamide group, naphthylacetamide group And so on.

Examples of the alkoxy group as a substituent that the aromatic residue represented by Y ₁ and Y _{2 in} Formula (1) may have include a methoxy group, an ethoxy group, an n-propoxy group, an isopropoxy group, and n-butoxy. Group, isobutoxy group, sec-butoxy group, t-butoxy group and the like.
Examples of the aryloxy group as a substituent that the aromatic residue represented by Y ₁ and Y _{2 in} Formula (1) may have include a phenoxy group and a naphthoxy group.
Examples of the acyl group as a substituent that the aromatic residue represented by Y ₁ and Y _{2 in} Formula (1) may have include an alkylcarbonyl group having 1 to 10 carbon atoms and an arylcarbonyl group. Preferably, it is an alkylcarbonyl group having 1 to 4 carbon atoms, and specific examples include acetyl group, propionyl group, trifluoromethylcarbonyl group, pentafluoroethylcarbonyl group, benzoyl group, naphthoyl group and the like.
Examples of the alkoxycarbonyl group as the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} Formula (1) may have include an alkoxycarbonyl group having 1 to 10 carbon atoms. Specific examples thereof include a methoxycarbonyl group, an ethoxycarbonyl group, an n-propoxycarbonyl group, an isopropoxycarbonyl group, an n-butoxycarbonyl group, an isobutoxycarbonyl group, a sec-butoxycarbonyl group, a t-butoxycarbonyl group, and an n-pen. A tooxycarbonyl group, an n-hexyloxycarbonyl group, an n-heptyloxycarbonyl group, an n-nonyloxycarbonyl group, and an n-decyloxycarbonyl group.

The arylcarbonyl group as a substituent that the aromatic residue represented by Y ₁ and Y _{2 in} Formula (1) may have represents, for example, a group in which an aryl group such as benzophenone or naphthophenone and carbonyl are linked.
The aromatic residue as the substituent which may be possessed by the aromatic residue represented by Y ₁ and Y ₂ in formula (1), the aromatic residues represented by Y ₁ and Y ₂ in formula (1) The same as mentioned in the section.

Examples of the aliphatic hydrocarbon residue as a substituent that the aromatic residue represented by Y ₁ and Y _{2 in} formula (1) may have include a saturated or unsaturated, linear, branched or cyclic group Examples thereof include an alkyl group, and the aliphatic hydrocarbon residue may have a substituent. The aliphatic hydrocarbon residue is preferably a saturated alkyl group, and more preferably a saturated linear alkyl group. Moreover, it is preferable that carbon number which an aliphatic hydrocarbon residue has is 1-36, It is more preferable that it is 1-18, It is still more preferable that it is 1-8. Specific examples of these aliphatic hydrocarbon residues include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, iso-butyl group, sec-butyl group, t-butyl group, n- Pentyl group, n-hexyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decyl group, n-undecyl group, n-dodecyl group, n-tridecyl group, n-tetradecyl group, n- Pentadecyl, n-hexadecyl, n-heptadecyl, n-octadecyl, cyclohexyl, vinyl, propenyl, pentynyl, butenyl, hexenyl, hexadienyl, isopropenyl, isohexenyl, cyclohex Xenyl, cyclopentadienyl, ethynyl, propynyl, pentynyl, hexynyl, isohexynyl, cyclohexyl Group and the like. Moreover, as a cyclic | annular alkyl group, a C3-C8 cycloalkyl group etc. are mentioned, for example. Particularly preferably, it is a linear alkyl group having 1 to 8 carbon atoms.

Aromatic residue, aliphatic hydrocarbon residue, amide group, acyl group, alkoxy group, aryloxy as a substituent that the aromatic residue represented by Y ₁ and Y _{2 in} formula (1) may have Group, arylcarbonyl group and alkoxycarbonyl group may have a substituent, and the substituent may be a substituent which the aromatic residue represented by Y ₁ and Y ₂ in formula (1) may have. Examples are the same as those described in the group section.
The aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) is at least one group selected from the group consisting of a carboxyl group, a hydroxyl group, a phosphate group, a sulfonate group, and a salt of these acidic groups. It is preferably an aromatic residue having two substituents, and more preferably any one of groups represented by the following formulas (1001) to (1033).

The aliphatic hydrocarbon residue represented by Y ₁ and Y ₂ in the formula (1) is described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have. And the same aliphatic hydrocarbon residues. The aliphatic hydrocarbon residue represented by Y ₁ and Y ₂ may have a substituent, and the substituent includes the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1). Examples thereof may be the same as those described in the section of the substituent which may be present.
As the acyl group represented by Y ₁ and Y ₂ in formula (1), the acyl group described in the section of the substituent that the aromatic residue represented by Y ₁ and Y ₂ in formula (1) may have and The same can be mentioned. The acyl group may have a substituent, and the substituent is described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have. The same thing is mentioned.

The amide group represented by Y ₁ and Y ₂ in the formula (1) is the same as that described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have. Things. The amide group may have a substituent, and the substituent is described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have. The same thing as an amide group is mentioned.
The alkoxycarbonyl group represented by Y ₁ and Y ₂ in the formula (1) is an alkoxycarbonyl described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have. The same thing as a group is mentioned. The alkoxycarbonyl group may have a substituent, and the substituent is described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have. The same thing is mentioned.

Y ₁ and Y ₂ in Formula (1) may be bonded to form a ring. The ring may have a substituent, and as the substituent, those described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have The same thing is mentioned. Specific examples of the ring structure formed by combining Y ₁ and Y ₂ include ring structures represented by the following formulas (2001) to (2044). Among these, the ring structure has a carboxyl group as a substituent. It is particularly preferable that the ring structure is (2007) or (2012), and (2007) is very preferable.

The * mark in the above formulas (2001) to (2044) represents a carbon atom to which both Y ₁ and Y ₂ are bonded in formula (1).

Y ₁ and Y ₂ in Formula (1) are preferably any of the following (i) to (iii).
(I) Y ₁ and Y ₂ are preferably each independently a carboxyl group, a phosphate group, a cyano group or an acyl group, more preferably each independently a carboxyl group, a cyano group or an acyl group, Is more preferably a carboxyl group and the other is a carboxyl group, a cyano group or an acyl group, and it is particularly preferable that one is a carboxyl group and the other is a cyano group.
(Ii) At least one of Y ₁ and Y ₂ is a group selected from the group consisting of a carboxyl group, a hydroxyl group, a phosphate group, a sulfonate group, and a salt of these acidic groups as at least one substituent. It is preferable that it is an aromatic residue, and it is more preferable that the aromatic residue is represented by the above formulas (1001) to (1033).
(Iii) Y ₁ and Y ₂ are preferably bonded to form a ring structure, and the ring structure is more preferably any one of the above formulas (2001) to (2044), and the ring structure is a carboxyl group. Are more preferable, the ring structure is particularly preferably the formula (2007) or (2012), and the formula (2007) is very particularly preferable.
Among the above (i) to (iii), (i) is most preferable.

In formula (1), A ₁ and A ₂ each independently represent a hydrogen atom, a phenyl group, a naphthyl group or an aliphatic hydrocarbon residue, and the phenyl group, naphthyl group and aliphatic hydrocarbon residue each have a substituent. You may have.
As the aliphatic hydrocarbon residue represented by A ₁ and A ₂ in the formula (1), the aliphatic hydrocarbon residue described in the section of the aliphatic hydrocarbon residue represented by Y ₁ and Y _{2 in} the formula (1) The same thing is mentioned.
As the substituent that the phenyl group and naphthyl group represented by A ₁ and A _{2 in} Formula (1) may have, the substituent that the aromatic residue represented by Y ₁ and Y ₂ may have The same as mentioned in the section.
A ₁ and A _{2 in} the formula (1) are each independently a phenyl group which may have a substituent or a naphthyl group which may have a substituent, and both have a substituent. It is more preferably a phenyl group which may have or a naphthyl group which may have a substituent, and more preferably a phenyl group which both may have a substituent. In the above, the substituent which the phenyl group or naphthyl group may have is preferably an alkoxy group, an aliphatic hydrocarbon residue or a disubstituted amino group, and an alkoxy group having 1 to 8 carbon atoms. More preferably, an alkyl group having 1 to 8 carbon atoms or an amino group having two substituted alkyl groups having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, and an alkyl group having 1 to 6 carbon atoms. Or an amino group having two substituted alkyl groups having 1 to 4 carbon atoms, a straight-chain alkoxy group having 1 to 6 carbon atoms, a straight-chain alkyl group having 1 to 6 carbon atoms, or carbon It is particularly preferable that the linear alkyl group having 1 to 4 is an amino group substituted by two.

In formula (1), A ₃ and A ₄ each independently represent a hydrogen atom, an aliphatic hydrocarbon residue, a cyano group, a halogen atom, an amide group, an alkoxy group, an alkoxycarbonyl group, or an acyl group, and m is 2 or more. In the case where there are a plurality of A ₃ and A ₄ , each A ₃ may be the same or different from each other, and each A ₄ may be the same or different from each other.
Examples of the aliphatic hydrocarbon residue represented by A ₃ and A ₄ in the formula (1) include the aliphatic hydrocarbon residues described in the section of the aliphatic hydrocarbon residue represented by Y ₁ and Y _{2 in} the formula (1). The same thing is mentioned.
As the halogen atom represented by A ₃ and A ₄ in the formula (1), the halogen atom described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have and The same can be mentioned.
Examples of the amide group represented by A ₃ and A ₄ in the formula (1) include the same amide groups described in the section of the amide group represented by Y ₁ and Y _{2 in} the formula (1).
As the alkoxy group represented by A ₃ and A ₄ in the formula (1), the alkoxy group described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have and The same can be mentioned. The alkoxy group may have a substituent, and the substituent is described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have. The same thing is mentioned.
Examples of the alkoxycarbonyl group represented by A ₃ and A ₄ in the formula (1) include the same alkoxycarbonyl groups described in the section of the alkoxycarbonyl group represented by Y ₁ and Y _{2 in} the formula (1).
Examples of the acyl group represented by A ₃ and A ₄ in the formula (1) include the same acyl groups as described in the section of the acyl group represented by Y ₁ and Y _{2 in} the formula (1).
A ₃ and A _{4 in} the formula (1) are each independently preferably a hydrogen atom or an aliphatic hydrocarbon residue, and more preferably a hydrogen atom.

In formula (1), A ₅ , A ₆ and A ₇ are each independently a hydrogen atom, aromatic residue, aliphatic hydrocarbon residue, cyano group, halogen atom, amide group, substituted or unsubstituted amino group, alkoxy Group, an aryloxy group, an alkoxycarbonyl group, an arylcarbonyl group or an acyl group, and when n is 2 or more and A ₅ and A ₆ are present in plural, each A ₅ may be the same as or different from each other, A ₆ may be the same as or different from each other.
When n is other than 0, at least two selected from A ₁ , A ₂ and A ₃ may be bonded to form a ring.
The aromatic residues represented by A ₅ , A ₆ and A ₇ in the formula (1) are the same as the aromatic residues described in the section of the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1). Is mentioned.
Examples of the aliphatic hydrocarbon residue represented by A ₅ , A ₆ and A ₇ in the formula (1) include the aliphatic hydrocarbon residues described in the section of the acyl group represented by Y ₁ and Y _{2 in} the formula (1) The same can be mentioned.
The halogen atom represented by A ₅ , A ₆ and A ₇ in the formula (1) is described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have. The same thing as a halogen atom is mentioned.

Examples of the amide group represented by A ₅ , A ₆ and A ₇ in the formula (1) include the same amide groups described in the section of the amide group represented by Y ₁ and Y _{2 in} the formula (1).
The substituted or unsubstituted amino group represented by A ₅ , A ₆ and A ₇ in the formula (1) is the substituent which the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have. Examples thereof include the same as the substituted or unsubstituted amino group described in the item. The substituted or unsubstituted amino group may have a substituent, and examples of the substituent include substituents that the aromatic residue represented by Y ₁ and Y ₂ in Formula (1) may have. The same as mentioned in the section.
The alkoxy group represented by A ₅ , A ₆ and A ₇ in the formula (1) is described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have. The same thing as an alkoxy group is mentioned. The alkoxy group may have a substituent, and the substituent is described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have. The same thing is mentioned.
The aryloxy group represented by A ₅ , A ₆ and A ₇ in the formula (1) is described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have. And the same aryloxy group. The aryloxy group may have a substituent, and the substituent is described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have. The same thing is mentioned.
Examples of the alkoxycarbonyl group represented by A ₅ , A ₆ and A ₇ in the formula (1) include the same alkoxycarbonyl groups described in the section of the alkoxycarbonyl group represented by Y ₁ and Y _{2 in} the formula (1). .
The arylcarbonyl group represented by A ₅ , A ₆ and A ₇ in the formula (1) is described in the section of the substituent which the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have. And the same arylcarbonyl group. The arylcarbonyl group may have a substituent, and the substituent is described in the section of the substituent that the aromatic residue represented by Y ₁ and Y ₂ in Formula (1) may have. The same thing is mentioned.
Examples of the acyl group represented by A ₅ , A ₆ and A ₇ in the formula (1) include the same acyl groups as described in the section of the acyl group represented by Y ₁ and Y _{2 in} the formula (1).

Examples of the ring formed by A ₅ , A ₆ and A ₇ include an unsaturated hydrocarbon ring or a heterocyclic ring.
Examples of the unsaturated hydrocarbon ring include benzene, naphthalene, anthracene, phenanthrene, pyrene, indene, azulene, fluorene, cyclobutene, cyclohexene, cyclopentene, cyclohexadiene, cyclopentadiene, and examples of the heterocyclic ring include Examples include pyran, pyridine, pyrazine, piperidine, indoline, oxazole, thiazole, thiadiazole, oxadiazole, indole, benzothiazole, benzoxazole, quinoline, carbazole, benzopyran and the like. Of these, benzene, cyclobutene, cyclopentene, and cyclohexene are preferred.
These unsaturated hydrocarbon rings, heterocycles and the like may have a substituent, and the substituent may be a substituent which the aromatic residue represented by Y ₁ and Y ₂ in Formula (1) may have. Examples are the same as those described in the group section.

When the heterocyclic ring formed by at least two selected from A ₅ , A ₆ and A ₇ has a substituent such as a carbonyl group or a thiocarbonyl group, these substituents are cyclic ketones or cyclic thioketones. These rings may further have a substituent. Examples of the substituent in that case include the same substituents as those described in the section of the substituent that the aromatic residue represented by Y ₁ and Y ₂ in Formula (1) may have.
A ₅ , A ₆ and A ₇ in the formula (1) are each independently preferably a hydrogen atom or an aliphatic hydrocarbon residue, more preferably a hydrogen atom.

As the compound of the present invention, a compound represented by the following formula (2) (that is, A ₁ and A ₂ in the formula (1) are each independently a phenyl group which may have a substituent, and Compounds in which n is 0) are preferred.

In the formula (2), m, X ₁ , X ₂ , X ₃ , Y ₁ , Y ₂ , A ₃ , A ₄ and A ₇ are m, X ₁ , X ₂ , X ₃ , Y ₁ in the formula (1). , Y ₂ , A ₃ , A ₄ and A ₇ have the same meanings, and preferred ones are also the same as those preferred in formula (1).
In formula (2), p and q each independently represent an integer of 0 to 3, preferably each independently an integer of 1 to 3, and more preferably 1.
In the formula (2), R ₂ and R ₃ are each independently a hydrogen atom, aliphatic hydrocarbon residue, cyano group, halogen atom, amide group, substituted or unsubstituted amino group, alkoxy group, aryloxy group, alkoxycarbonyl Group, an arylcarbonyl group or an acyl group, when p is 2 or more and a plurality of R ₂ are present, each R ₂ may be the same or different from each other, and q is 2 or more and a plurality of R ₃ are present , Each R ₃ may be the same as or different from each other.
Examples of the aliphatic hydrocarbon residue represented by R ₂ and R _{3 in} the formula (2) include the aliphatic hydrocarbon residues described in the section of the aliphatic hydrocarbon residue represented by Y ₁ and Y _{2 in} the formula (1). The same thing is mentioned.

As the halogen atom represented by R ₂ and R _{3 in} the formula (2), the halogen atom described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have and The same can be mentioned.
Examples of the amide group represented by R ₂ and R _{3 in} the formula (2) include the same amide groups as described in the section of the amide group represented by Y ₁ and Y _{2 in} the formula (1).
The substituted or unsubstituted amino group represented by R ₂ and R _{3 in} the formula (2) is described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have. And the same as the substituted or unsubstituted amino group. The substituted or unsubstituted amino group may have a substituent, and examples of the substituent include substituents that the aromatic residue represented by Y ₁ and Y ₂ in Formula (1) may have. The same as mentioned in the section.
As the alkoxy group represented by R ₂ and R _{3 in} the formula (2), the alkoxy group described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have and The same can be mentioned. The alkoxy group may have a substituent, and the substituent is described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have. The same thing is mentioned.
As the aryloxy group represented by R ₂ and R _{3 in} the formula (2), the aryloxy group described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have The same thing as a group is mentioned. The aryloxy group may have a substituent, and the substituent is described in the section of the substituent that the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have. The same thing is mentioned.

Examples of the alkoxycarbonyl group represented by R ₂ and R _{3 in} the formula (2) include the same alkoxycarbonyl groups described in the section of the alkoxycarbonyl group represented by Y ₁ and Y _{2 in} the formula (1).
As the arylcarbonyl group represented by R ₂ and R _{3 in} the formula (2), the arylcarbonyl described in the section of the substituent which the aromatic residue represented by Y ₁ and Y _{2 in} the formula (1) may have The same thing as a group is mentioned. The arylcarbonyl group may have a substituent, and the substituent is described in the section of the substituent that the aromatic residue represented by Y ₁ and Y ₂ in Formula (1) may have. The same thing is mentioned.
Examples of the acyl group represented by R ₂ and R _{3 in} the formula (2) include the same acyl groups as described in the section of the acyl group represented by Y ₁ and Y _{2 in} the formula (1).
R ₂ and R ₃ in Formula (2) are each independently preferably an aliphatic hydrocarbon residue, an alkoxy group, or a substituted or unsubstituted amino group, and each independently an alkyl group having 1 to 8 carbon atoms, It is more preferable that it is the amino group which the C1-C8 alkoxy group or the C1-C6 alkyl group substituted, and C1-C6 alkyl group and C1-C6 alkoxy each independently. It is more preferable that the group or an amino group substituted with two alkyl groups having 1 to 4 carbon atoms. Moreover, as said alkyl group and alkoxy group, a linear thing is preferable.

  When the compound represented by the formula (1) has an acidic group such as a carboxyl group, a phosphoric acid group, a hydroxyl group, and a sulfonic acid group as a substituent, each may form a salt. Examples of the salt include lithium, Salts with alkali metals such as sodium and potassium, or alkaline earth metals such as magnesium and calcium, or organic bases such as quaternary ammonium salts such as tetramethylammonium, tetrabutylammonium, pyridinium, imidazolium, piperazinium and piperidinium And salts such as

  The compound represented by the formula (1) has structural isomers such as a cis isomer, a trans isomer, and an optical isomer, but is not particularly limited, and any isomer is preferable as a photosensitizing dye in the invention. Can be used.

Preferred combinations of m, n, X ₁ , X ₂ , X ₃ , Y ₁ , Y ₂ , A ₁ , A ₂ , A ₃ , A ₄ , A ₅ , A ₆ and A _{7 in} the formula (1) are as described above. Of m, n, X ₁ , X ₂ , X ₃ , Y ₁ , Y ₂ , A ₁ , A ₂ , A ₃ , A ₄ , A ₅ , A ₆ and A ₇ More preferred combinations are as follows.
That is, m is 1 or 2, n is an integer of 0 to 2, X ₁ , X ₂ and X ₃ are each independently a sulfur atom or selenium atom, and Y ₁ and Y ₂ are each independently carboxyl A group, a cyano group, or an acyl group, and at least one of Y ₁ and Y ₂ is selected from the group consisting of a carboxyl group, a hydroxyl group, a phosphate group, a sulfonate group, and a salt of these acidic groups An aromatic residue having a group as at least one substituent, or Y ₁ and Y ₂ are bonded to form a ring structure having a carboxyl group as a substituent, and A ₁ and A ₂ are each independently A phenyl group or naphthyl group which may have an alkoxy group having 1 to 6 carbon atoms, an alkyl group having 1 to 8 carbon atoms as a substituent, or an amino group in which two alkyl groups having 1 to 6 carbon atoms are substituted. Yes, A _3, A _{4, 5,} the combination A ₆ and A ₇ are each independently hydrogen atom or an aliphatic hydrocarbon residue are preferred.

Furthermore, m is 1 or 2, n is 0, X ₁ , X ₂ and X ₃ are sulfur atoms, one of Y ₁ and Y ₂ is a carboxyl group and the other is a carboxyl group, a cyano group or It is an acyl group, at least one of Y ₁ and Y ₂ is an aromatic residue represented by any one of the above formulas (1001) to (1033), or Y ₁ and Y ₂ are bonded Thus, a ring structure represented by any one of the above formulas (2001) to (2044) is formed, and A ₁ and A ₂ are each independently an alkoxy group having 1 to 4 carbon atoms and 1 to 6 carbon atoms. A combination in which an alkyl group or an amino group in which two alkyl groups having 1 to 6 carbon atoms are substituted is a phenyl group, and A ₃ , A _4, and A ₇ are hydrogen atoms is more preferable.

In addition, a preferable combination of m, X ₁ , X ₂ , X ₃ , Y ₁ , Y ₂ , A ₃ , A ₄ , A ₇ , p, q, R ₂ and R _{3 in} the formula (2) is the above m , X ₁ , X ₂ , X ₃ , Y ₁ , Y ₂ , A ₃ , A ₄ , A ₇ , p, q, R _2, and R ₃ , a combination of those preferred, and more preferable The combinations are as follows.
That is, whether m is 1 or 2, X ₁ , X ₂ and X ₃ are each independently a sulfur atom or a selenium atom, and Y ₁ and Y ₂ are each independently a carboxyl group, a cyano group or an acyl group. , Y ₁ and Y ₂ each having at least one substituent selected from the group consisting of a carboxyl group, a hydroxyl group, a phosphoric acid group, a sulfonic acid group, and a salt of these acidic groups. Is a group residue, or Y ₁ and Y ₂ are bonded to form a ring structure having a carboxyl group as a substituent, and A ₃ , A ₄ and A ₇ are each independently a hydrogen atom or aliphatic carbonization A hydrogen residue, p and q are each independently an integer of 1 to 3, and R ₂ and R ₃ are each independently an alkoxy group having 1 to 8 carbon atoms, an alkyl group having 1 to 8 carbon atoms, or a carbon number 1-6 alkyl groups are disubstituted The combination is an amino group.
Furthermore, m is 1 or 2, X ₁ , X ₂ and X ₃ are sulfur atoms, one of Y ₁ and Y ₂ is a carboxyl group and the other is a carboxyl group, a cyano group or an acyl group, At least one of Y ₁ and Y ₂ is an aromatic residue represented by any one of the above formulas (1001) to (1033), or Y ₁ and Y ₂ are bonded to form the above formula (2001). ) To (2044), A ₃ , A ₄ and A ₇ are hydrogen atoms, p and q are 1, and R ₂ and R ₃ are each independent. The combination which is the amino group which the C1-C6 alkoxy group, the C1-C6 alkyl group, or the C1-C4 alkyl group substituted by 2 is preferable.

  As represented by the above formulas (1001) to (1017), (1019), and (1020), the counter ion for neutralizing the positive charge of the nitrogen atom may be formed either intermolecularly or intramolecularly. Good. Preferable counter ions between molecules include iodine, perchloric acid, bistrifluoromethylsulfonimide, tristrifluoromethylsulfonylmethane, hexafluoroantimonic acid, tetrafluoroboric acid and the like. Preferred counter ions in the molecule include anions such as 2-yl acetate, 3-yl propionate and sulfoethane-2-yl bonded to a positively charged nitrogen atom.

The compound represented by the formula (1) can be produced, for example, according to the following reaction formula, but the present invention is not limited to these synthesis methods. In the following formulas (3) to (12), X ₁ , X ₂ , Y ₁ , Y ₂ , A ₁ , A ₂ , A ₅ , A ₆ and A ₇ have the same meaning as in formula (1). Represents.
To the benzaldehyde represented by the formula (3), atoms corresponding to X ₁ and X ₂ (one or two selected from the group consisting of an oxygen atom, a sulfur atom, a selenium atom and a tellurium atom) and a halogenating agent ( For example, a compound represented by the formula (4) is obtained by reacting thionyl halide and the like.
Next, the compound represented by the formula (5) obtained by reacting the compound represented by the formula (4) with bromine (such as halogen) is reacted with the amine compound represented by the formula (6). The compound represented by 7) is obtained.
Thereafter, the boronic acid compound represented by the formula (8) is reacted with the compound represented by the formula (7) to obtain a compound represented by the formula (9), and finally the active methylene represented by the formula (10). If necessary, an alcohol such as methanol, ethanol, isopropanol, or butanol in the presence of a basic catalyst such as caustic soda, sodium methylate, sodium acetate, diethylamine, triethylamine, piperidine, piperazine, diazabicycloundecene, etc. The compound of the present invention is condensed by condensation at 20 ° C. to 180 ° C., preferably 50 ° C. to 150 ° C. in an aprotic polar solvent such as compounds, dimethylformamide, N-methylpyrrolidone, or a solvent such as toluene, acetic anhydride, acetonitrile, A compound represented by the formula (1) is obtained.

The above reaction formula is a method of synthesizing a compound represented by the formula (1) using benzaldehyde as a starting material. The compounds represented by the following formulas (11) and (12) are used as starting materials, After obtaining the compound represented by Formula (4) through the compound represented by Formula (12) by a method, the compound represented by Formula (1) is obtained by performing the same process as the above reaction formula. It is also possible.

Specific examples of the compound represented by the following formula (14) are shown in Tables 1 to 19. In each table, Ph means a phenyl group. Those described as (1001) to (1033) correspond to the above formulas (1001) to (1033). Those expressed as (2001) to (2044) represent a ring formed by combining Y ₁ and Y ₂ , and correspond to the above formulas (2001) to (2044).

In the photoelectric conversion device of the present invention, for example, a thin film of oxide semiconductor fine particles is provided on a substrate using oxide semiconductor fine particles, and then the compound represented by the formula (1) is supported on the thin film.
As a substrate on which a thin film of oxide semiconductor fine particles is provided, a substrate having a conductive surface is preferable, but such a substrate is easily available in the market. For example, conductive metal oxides such as tin oxide doped with indium, fluorine and antimony on the surface of transparent polymer materials such as glass or polyethylene terephthalate or polyether sulfone, and metals such as copper, silver and gold A substrate provided with a thin film can be used as the substrate. The conductivity is usually 1000Ω or less, and particularly preferably 100Ω or less.
The oxide semiconductor fine particles are preferably metal oxides, and specific examples thereof include oxides of titanium, tin, zinc, tungsten, zirconium, gallium, indium, yttrium, niobium, tantalum, vanadium, and the like. Of these, oxides such as titanium, tin, zinc, niobium or indium are preferred, and titanium oxide, zinc oxide and tin oxide are most preferred. These oxide semiconductors can be used alone, but can also be used by mixing or coating the surface of the semiconductor. The average particle size of the oxide semiconductor fine particles is usually 1 to 500 nm, preferably 1 to 100 nm. The oxide semiconductor fine particles may be mixed with a large particle size and a small particle size, or may be used in multiple layers.

  The thin film of oxide semiconductor fine particles is a method of forming oxide semiconductor fine particles as a thin film of semiconductor fine particles directly on the substrate by spray spraying, a method of electrically depositing semiconductor fine particles into a thin film using the substrate as an electrode, It can be produced by applying a paste containing fine particles obtained by hydrolyzing a precursor of semiconductor fine particles such as slurry or semiconductor alkoxide on a substrate, followed by drying, curing or baking. In view of the performance of the electrode using an oxide semiconductor, a method using a slurry is preferable. In the case of this method, the slurry is obtained by dispersing the secondary agglomerated oxide semiconductor fine particles in a dispersion medium by an ordinary method so that the average primary particle diameter is 1 to 200 nm.

  The dispersion medium for dispersing the slurry is not particularly limited as long as it can disperse the semiconductor fine particles, and water, alcohol such as ethanol, ketone such as acetone and acetylacetone, hydrocarbon such as hexane, and the like are used. In addition, the use of water is preferable in that the viscosity change of the slurry is reduced. A dispersion stabilizer can be used for the purpose of stabilizing the dispersion state of the oxide semiconductor fine particles. Examples of the dispersion stabilizer used include acids such as acetic acid, hydrochloric acid, and nitric acid, and organic solvents such as acetylacetone, acrylic acid, polyethylene glycol, and polyvinyl alcohol.

  The substrate to which the slurry is applied may be fired, and the firing temperature is usually 100 ° C. or higher, preferably 200 ° C. or higher, and the upper limit is generally lower than the melting point (softening point) of the substrate material. Yes, preferably 600 ° C. or lower. The firing time is not particularly limited but is preferably within 4 hours. The thickness of the thin film on a board | substrate is 1-200 micrometers normally, Preferably it is 1-50 micrometers.

  A secondary treatment may be applied to the thin film of oxide semiconductor fine particles. That is, improving the performance of the thin film of semiconductor fine particles by, for example, immersing the thin film together with the substrate directly in a solution of the same metal alkoxide, chloride, nitride, sulfide, etc. as the semiconductor and drying or refiring. You can also. Examples of the metal alkoxide include titanium ethoxide, titanium isopropoxide, titanium t-butoxide, n-dibutyl-diacetyltin, and alcohol solutions thereof are used. Examples of the chloride include titanium tetrachloride, tin tetrachloride, zinc chloride and the like, and an aqueous solution thereof is used. The oxide semiconductor thin film thus obtained is composed of fine particles of an oxide semiconductor.

Next, a method for supporting the compound (dye) represented by the formula (1) of the present invention on a thin film of oxide semiconductor fine particles will be described.
As a method for supporting the compound represented by the formula (1), a solution obtained by dissolving the compound in a solvent capable of dissolving the compound or a compound having low solubility may be obtained by dispersing the compound. And a method in which the substrate provided with the thin film of oxide semiconductor fine particles is immersed in the dispersion. The concentration in the solution or dispersion is appropriately determined depending on the compound. A thin film of semiconductor fine particles formed on the substrate is immersed in the solution or dispersion. The immersion temperature is generally from room temperature to the boiling point of the solvent, and the immersion time is about 1 minute to 48 hours. Specific examples of solvents that can be used to dissolve the compound include, for example, methanol, ethanol, isopropanol, tetrahydrofuran (THF), acetonitrile, dimethyl sulfoxide (DMSO), dimethylformamide (DMF), acetone, n-butanol, and t-butanol. , Water, n-hexane, chloroform, dichloromethane, toluene and the like, and may be used alone or in combination depending on the solubility of the compound. The concentration of the compound in the solution is usually 1 × 10 ⁻⁶ M to 1M, and preferably 1 × 10 ⁻⁵ M to ¹ × 10 ⁻¹ M.
After soaking, the solvent is removed by air drying or heating if necessary. Thus, the photoelectric conversion element of the present invention having a thin film of oxide semiconductor fine particles sensitized with the compound represented by the formula (1) is obtained.

  The compound (pigment) represented by the formula (1) to be supported may be one kind or a mixture of several kinds. Moreover, when mixing, the compounds represented by Formula (1) of this invention may be sufficient, and another pigment | dye and a metal complex pigment | dye may be mixed. In particular, by mixing with pigments having different absorption wavelengths, a wide absorption wavelength can be used, and a solar cell with high conversion efficiency can be obtained. Examples of metal complex dyes that can be mixed are not particularly limited, but ruthenium complexes and their quaternary ammonium salt compounds, phthalocyanines, porphyrins, and the like shown in Non-Patent Document 2 are preferable. Phthalocyanines, porphyrins, cyanines, merocyanines, oxonol, triphenylmethane, methine dyes such as acrylic acid dyes described in Patent Document 2, dyes such as xanthene, azo, anthraquinone, and perylene Can be mentioned. Preferably, a ruthenium complex, a merocyanine, an acrylic acid-based methine dye, or the like is used. When two or more kinds of dyes are used, the dyes may be adsorbed sequentially on the thin film of semiconductor fine particles, or may be admixed and dissolved.

  The ratio of the dye to be mixed is not particularly limited, and the optimization condition is appropriately selected for each dye. Generally, it is preferable to use about 10% mol or more per one dye from the mixing of equimolar amounts. . When a dye is adsorbed to a thin film of oxide semiconductor fine particles using a solution in which two or more kinds of dyes are dissolved or dispersed, the total concentration of the dyes in the solution may be the same as when only one kind is supported. As the solvent in the case of using a mixture of dyes, the above-mentioned solvents can be used, and the solvents for the respective dyes to be used may be the same or different.

  When the dye is supported on the thin film of oxide semiconductor fine particles, it is advantageous to support the dye in the presence of an inclusion compound in order to prevent association between the dyes. Examples of inclusion compounds include steroidal compounds such as cholic acid, crown ether, cyclodextrin, calixarene, polyethylene oxide and the like. Specific examples of preferable compounds include deoxycholic acid, dehydrodeoxycholic acid, chenodeoxycholic acid, urso. Examples include deoxycholic acid, hyodeoxycholic acid, cholic acid methyl ester, cholic acid compounds such as sodium cholate, polyethylene oxide, and the like. Further, after the dye is supported, the semiconductor fine particle thin film may be treated with an amine compound such as 4-t-butylpyridine. As a treatment method, for example, a method in which a substrate provided with a thin film of semiconductor fine particles carrying a dye in an ethanol solution of an amine compound is immersed.

  The solar cell of the present invention comprises a photoelectric conversion element in which a dye is supported on a thin film of oxide semiconductor fine particles as one electrode, and is composed of a counter electrode, a redox electrolyte, a hole transport material, a p-type semiconductor, or the like. As forms of the redox electrolyte, the hole transport material, the p-type semiconductor, etc., known ones such as liquid, solidified body (gel and gel), and solid can be used. As liquids, redox electrolytes, molten salts, hole transport materials, p-type semiconductors, etc. dissolved in solvents, or room temperature molten salts, etc. are solidified (gel and gel), these are polymers. Examples include a matrix and a low molecular gelling agent. As a solid material, a redox electrolyte, a molten salt, a hole transport material, a p-type semiconductor, or the like can be used. Examples of the hole transport material include amine derivatives, conductive polymers such as polyacetylene, polyaniline, and polythiophene, and triphenylene compounds. Examples of the p-type semiconductor include CuI and CuSCN. The counter electrode is preferably conductive and has a catalytic action on the reduction reaction of the redox electrolyte. For example, a glass or polymer film deposited with platinum, carbon, rhodium, ruthenium or the like, or a film coated with conductive fine particles can be used.

The redox electrolyte used in the solar cell of the present invention is a halogen redox electrolyte comprising a halogen compound and a halogen molecule having a halogen ion as a counter ion, ferrocyanate-ferricyanate, ferrocene-ferricinium ion, cobalt complex, etc. Metal redox electrolytes such as metal complexes, and organic redox electrolytes such as alkylthiol-alkyldisulfides, viologen dyes, hydroquinone-quinones, and the like, and halogen redox electrolytes are preferred. Examples of the halogen molecule in the halogen redox electrolyte comprising a halogen compound-halogen molecule include iodine molecule and bromine molecule, and iodine molecule is preferable. The above, as the halogen compound to halide ions a counter ion, for example LiBr, NaBr, KBr, LiI, NaI, KI, CsI, CaI 2, MgI 2, CuI and halogenated metal salt or tetraalkylammonium iodide, and Examples include halogen quaternary ammonium salts such as imidazolium iodide and pyridinium iodide, and salt compounds having iodine ions as counter ions are preferred. Moreover, it is also preferable to use the electrolyte which uses imide ions, such as a bis (trifluoromethanesulfonyl) imide ion and a dicyano imide ion, as a counter ion other than the said iodine ion.

  When the redox electrolyte is constituted in the form of a solution containing the redox electrolyte, an electrochemically inert solvent is used as the solvent. For example, acetonitrile, propylene carbonate, ethylene carbonate, 3-methoxypropionitrile, methoxyacetonitrile, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, γ-butyrolactone, dimethoxyethane, diethyl carbonate, diethyl ether, diethyl carbonate, dimethyl carbonate, 1,2-dimethoxyethane, dimethylformamide, dimethyl sulfoxide, 1,3-dioxolane, methyl formate, 2-methyltetrahydrofuran, 3-methyl-oxazolidin-2-one, sulfolane, tetrahydrofuran, water and the like. Among these, acetonitrile, propylene carbonate, ethylene carbonate, 3-methoxypropionate Le, methoxy acetonitrile, ethylene glycol, 3-methyl - oxazolidin-2-one, .gamma.-butyrolactone are particularly preferred. You may use these individually or in combination of 2 or more types. In the case of a gel electrolyte, examples include those in which an electrolyte or an electrolyte solution is contained in a matrix such as an oligomer and a polymer, and those in which a low-molecular gelling agent or the like is similarly contained in an electrolyte or an electrolyte solution. The density | concentration of a redox electrolyte is 0.01-99 mass% normally, Preferably it is about 0.1-90 mass%.

  The solar cell of the present invention has a counter electrode so that a thin film of oxide semiconductor fine particles on a substrate is sandwiched between electrodes of a photoelectric conversion element carrying a compound (pigment) represented by the formula (1) of the present invention. Deploy. In the meantime, it is obtained by filling a solution containing a redox electrolyte.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples. In the examples, parts represent parts by mass unless otherwise specified. M representing the concentration of the solution represents mol / L. Moreover, a compound number is a compound number in the said specific example. The maximum absorption wavelength was measured with an ultraviolet-visible spectrophotometer (UV-3100PC, manufactured by Shimadzu Corporation). Nuclear magnetic resonance was measured by JNM-ECS400 (manufactured by JEOL Ltd.).

Synthesis example 1
4-butylaniline 3 parts, 4-bromo-butylbenzene 4.7 parts, palladium (II) acetate 0.23 parts, 2,2-bis (diphenylphosphino) -1,1′-binaphthyl 1.9 parts, 2.9 parts of sodium tert-butoxide was added to 35 parts of toluene and reacted for 15 hours under heating under reflux. The reaction mixture was extracted with chloroform-water, the chloroform phase was concentrated, separated and purified by column chromatography (ethyl acetate-hexane), and 4.5 parts of a compound represented by the following formula (300) was obtained as a yellow solid. .

Synthesis example 2
2.8 parts of the compound represented by the formula (300) obtained in Synthesis Example 1, 2,7-dibromo- [1] benzothieno [3,2-b] [1] benzothienothiophene (abbreviation: 2,7 -DibromoBTBT) 4 parts, tris (dibenzylideneacetone) dipalladium (0) 0.5 part, 2,2-bis (diphenylphosphino) -1,1'-binaphthyl 0.9 part, sodium tert-butoxide 0 .95 parts was added to 180 parts of toluene and allowed to react for 15 hours under heating and refluxing conditions. The reaction mixture was extracted with chloroform-water, and the chloroform phase was concentrated and then separated and purified by column chromatography (toluene-hexane) to obtain 1.8 parts of a compound represented by the following formula (301) as a yellow solid.

Synthesis example 3
0.9 part of the compound represented by the formula (301) obtained in Synthesis Example 2, 0.7 part of 5-formyl-2-thiopheneboronic acid, 0.6 part of tetrakis (triphenylphosphine) palladium (0), 0.95 part of potassium phosphate was added to 180 parts of tetrahydrofuran, and reacted for 15 hours under heating and refluxing conditions. The reaction mixture was extracted with chloroform-water, the chloroform phase was concentrated, separated and purified by column chromatography (toluene-hexane), and 0.36 parts of a compound represented by the following formula (302) was obtained as a vermilion solid.

Example 1
In a solution obtained by dissolving 0.36 part of the compound represented by the formula (302) obtained in Synthesis Example 3 and 0.15 part of cyanoacetic acid in a mixed solution of 10 parts of ethanol and 20 parts of toluene, 0.01 part of anhydrous piperazine Was added and reacted for 9 hours under reflux. The reaction mixture was extracted with chloroform-water, the chloroform phase was concentrated, and then separated and purified by column chromatography (toluene-ethyl acetate-ethanol). The dark red solid obtained after concentration was recrystallized from chloroform-hexane to obtain 0.2 part of a compound represented by the following formula (100) of the present invention (compound 9 in Table 1) as a dark red solid.
The maximum absorption wavelength of the compound represented by the formula (100) and the measured values of the nuclear magnetic resonance apparatus were as follows.
Maximum absorption wavelength; λmax = 244 nm, 294 nm, 357 nm, 454 nm (1.6 × 10 ⁻⁵ M, tetrahydrofuran solution)
Measured values of nuclear magnetic resonance;
¹ H-NMR (PPM: DMSO-d6): 0.92 (t.6H), 1.34 (m.4H), 1.56 (m.4H), 2.56 (m.4H), 7.00 (d.4H), 7.08 (dd .1H), 7.17 (d.4H), 7.59 (d.1H), 7.75 (m.2H), 7.84 (dd.1H), 7.92 (d.1H), 8.01 (d.1H), 8.08 (s. 1H), 8.55 (s.1H)

Synthesis example 4
According to Synthesis Example 3 except that 5-formyl-2-thiopheneboronic acid was changed to 5-formyl-2-bithiopheneboronic acid in Synthesis Example 3, 0.5 part of the following compound (303) was used as a yellow solid. Obtained.

Example 2
In Example 1, except that the compound represented by the formula (302) was changed to the compound represented by the formula (303), the compound represented by the following formula (101) of the present invention ( 0.2 parts of compound 380) of Table 9 were obtained as a dark red solid.
The maximum absorption wavelength of the compound represented by the formula (101) and the measured values of the nuclear magnetic resonance apparatus were as follows.
Maximum absorption wavelength; λmax = 244 nm, 292 nm, 387 nm, 467 nm (1.6 × 10 ⁻⁵ M, tetrahydrofuran solution)
Measured values of nuclear magnetic resonance;
¹ H-NMR (PPM: DMSO-d6): 0.92 (t.6H), 1.34 (m.4H), 1.56 (m.4H), 2.56 (m.4H), 7.00 (d.4H), 7.08 (dd .1H), 7.17 (d.4H), 7.49 (d.1H), 7.56 (d.1H), 7.61 (d.1H), 7.67 (d.1H), 7.71 (d.1H), 7.84 (dd. 1H), 7.92 (d.1H), 8.00 (d.1H), 8.02 (s.1H), 8.53 (s.1H)

Synthesis example 5
Synthesis Example 1 except that 3 parts of 4-butylaniline were changed to 3.3 parts of 4-butoxyaniline and 4.7 parts of 4-bromo-butylbenzene were changed to 4.7 parts of 4-butyl-propoxybenzene in Synthesis Example 1. According to 1, 4.9 parts of the following compound (304) was obtained as a yellow solid.

Synthesis Example 6
In Synthesis Example 2, the following compound (305) 0 was prepared according to Synthesis Example 2 except that 2.8 parts of the compound represented by formula (300) was changed to 3.0 parts of the compound represented by formula (304). .75 parts were obtained as a yellow solid.

Synthesis example 7
In Synthesis Example 3, 0.9 part of the compound represented by the formula (301) was changed to 0.75 part of the compound represented by the formula (305), and 5-formyl-2-thiopheneboronic acid was substituted with 5-formyl-2- 0.19 part of the following compound (306) was obtained as a yellow solid according to Synthesis Example 3 except that the compound was changed to bithiopheneboronic acid.

Example 3
In Example 1, according to Example 1 except that 0.36 part of the compound represented by Formula (302) was changed to 0.19 part of the compound represented by Formula (306), the following formula ( 102) (Compound 388 of Table 9) (0.04 parts) was obtained as a dark red solid.
The maximum absorption wavelength of the compound represented by the formula (102) and the measured values of the nuclear magnetic resonance apparatus were as follows.
Maximum absorption wavelength: λmax = 244 nm, 293 nm, 389 nm, 467 nm (1.6 × 10 ⁻⁵ M, tetrahydrofuran solution)
Measured values of nuclear magnetic resonance;
¹ H-NMR (PPM: DMSO-d6): 0.95 (t.3H), 0.99 (t.3H), 1.46 (m.2H), 1.72 (m.4H), 3.92 (t.2H), 3.96 (t .2H), 6.94 (d.2H), 6.98 (dd.1H), 7.08 (d.2H), 7.39 (d.1H), 7.53 (d.1H), 7.59 (d.1H), 7.71 (d. 1H), 7.75 (s.1H), 7.84 (m.2H), 7.97 (d.1H), 8.14 (s.1H), 8.52 (s.1H)

Synthesis Example 8
In Synthesis Example 1, 3 parts of 4-butylaniline are changed to 3.3 parts of N, N-diethyl-p-phenylenediamine, 4.7 parts of 4-bromo-butylbenzene are changed to 4.7 parts of 4-butyl-propoxybenzene. Except for the change, according to Synthesis Example 1, 3.3 parts of the following compound (307) was obtained as a yellow solid.

Synthesis Example 9
In Synthesis Example 2, the following compound (308) 1 was prepared according to Synthesis Example 2 except that 2.8 parts of the compound represented by Formula (300) was changed to 3.3 parts of the compound represented by Formula (307). .6 parts were obtained as a yellow solid.

Synthesis Example 10
In Synthesis Example 3, 0.9 part of the compound represented by the formula (301) was changed to 0.92 part of the compound represented by the formula (308), and 5-formyl-2-thiopheneboronic acid was substituted with 5-formyl-2- Except for changing to bithiopheneboronic acid, 0.43 part of the following compound (309) was obtained as a vermilion solid according to Synthesis Example 3.

Example 4
In Example 1, according to Example 1 except that 0.36 part of the compound represented by Formula (302) was changed to 0.43 part of the compound represented by Formula (309), the following formula ( 103) (Compound 407 of Table 10) 0.07 part was obtained as a dark red solid.
The maximum absorption wavelength of the compound represented by the formula (103) and the measured values of the nuclear magnetic resonance apparatus were as follows.
Maximum absorption wavelength; λmax = 246 nm, 295 nm, 462 nm (1.6 × 10 ⁻⁵ M, tetrahydrofuran solution)
Measured values of nuclear magnetic resonance;
¹ H-NMR (PPM: DMSO-d6): 0.99 (t.3H), 1.10 (t.3H), 1.74 (m.2H), 3.36 (m.2H), 3.91 (t.2H), 6.68 (d .2H), 6.93 (m.3H), 7.02 (d.2H), 7.08 (d.2H), 7.31 (dd.1H), 7.47 (d.1H), 7.54 (d.1H), 7.66 (d. 1H), 7.69 (d.1H), 7.80 (m.2H), 7.94 (d.1H), 8.00 (s.1H), 8.50 (s.1H)

Example 5
The compound represented by the formula (100) was dissolved in acetone so as to be 1.6 × 10 ⁻⁴ M and the following cholic acid (formula (a)) was 1 × 10 ⁻² M. In this solution, a porous substrate (semiconductor thin film electrode obtained by sintering porous titanium oxide on a transparent conductive glass electrode for 60 minutes at 500 ° C.) was immersed at 25 ° C. for 3 days to carry a dye, washed with a solvent, It was dried to obtain a cholic acid-treated dye-sensitized semiconductor thin film. A conductive glass whose surface was sputtered with platinum was fixed so as to be sandwiched therebetween, and a solution containing an electrolyte was injected into the gap to produce a solar cell (battery 1) of the present invention. The electrolyte was 3-methoxypropionitrile, iodine / lithium iodide / 1,2-dimethyl-3-n-propylimidazolium iodide / t-butylpyridine, 0.1M / 0.1M / 0.6M, respectively. /1.0 M dissolved was used.

Examples 6 and 7
In Example 5, a solar cell was prepared according to Example 5 except that the compound represented by the formula (100) was changed to the compound represented by the formula (101) and the formula (102). Batteries (Batteries 2 and 3) were produced.

Comparative Example 1
In Example 5, a solar cell was prepared according to Example 5 except that the compound represented by the formula (100) was changed to a comparative compound represented by the following formula (400). A solar cell (battery 4) was produced.

Comparative Example 2
In Example 5, a solar cell was prepared according to Example 5 except that the compound represented by the formula (100) was changed to a comparative compound represented by the following formula (401). A solar cell (battery 5) was produced.

Evaluation test 1 (Measurement of photoelectric conversion ability)
Photoelectric conversion capacity was measured for the batteries 1 to 3 obtained in Examples 3 to 6 and the batteries 4 and 5 obtained in Comparative Examples 1 and 2. A 1 kW xenon lamp (manufactured by WACOM) is used as a light source, 100 mW / cm ² is passed through an AM1.5 filter, and a short circuit current density, release voltage, and conversion efficiency are measured using a solar simulator (WXS-155S-10, manufactured by WACOM). It was measured. The results are shown in Table 20.

Evaluation test 2 (IPCE (external quantum efficiency) measurement)
The IPCE (external quantum efficiency) was measured for the battery 3 obtained in Example 7 and the batteries 4 and 5 obtained in Comparative Examples 1 and 2. For the measurement, a spectral sensitivity measuring device (manufactured by Spectrometer Co., Ltd.) was used, and the measurement results were plotted with the wavelength of incident light as the horizontal axis and the relative value of IPCE as the vertical axis. The obtained graph is shown in FIG.

  From Table 20, it was revealed that the photoelectric conversion efficiency is improved when a dye-sensitized photoelectric conversion element sensitized by the compound represented by the general formula (1) is used. In addition, from FIG. 1, when a dye-sensitized photoelectric conversion element sensitized by the compound represented by the general formula (1) is used, photoelectric conversion is possible up to light having a longer wavelength, and efficient photoelectric conversion is possible. It was found that it contributed to the conversion. From the above results, it can be said that the compound represented by the general formula (1) of the present invention is a useful compound in order to effectively convert visible light into electricity in the dye-sensitized photoelectric conversion element.

It is a graph which shows the characteristic of the photoelectric conversion element of this invention.

In the dye-sensitized photoelectric conversion element of the present invention, a solar cell having high conversion efficiency and stability can be provided by using a compound having a specific structure.

Claims (12)

Following formula (1)

(In the formula (1), m represents an integer of 1 to 3, and n represents an integer of 0 to 6. X ₁ , X ₂ and X ₃ are each independently an oxygen atom, sulfur atom, selenium atom or tellurium atom. When m is 2 or more and a plurality of X ₃ are present, each X ₃ may be the same or different from each other Y ₁ and Y ₂ are each independently a hydrogen atom, aromatic residue, aliphatic carbonization Represents a hydrogen residue, carboxyl group, phosphoric acid group, sulfonic acid group, cyano group, acyl group, amide group, alkoxycarbonyl group or sulfonylbenzene group, and Y ₁ and Y ₂ combine to form a ring. A ₁ and A ₂ each independently represent a hydrogen atom, a phenyl group, a naphthyl group or an aliphatic hydrocarbon residue, A ₃ and A ₄ each independently represent a hydrogen atom, an aliphatic hydrocarbon residue, Cyano group, halogen atom, amide group, alkoxy Group, alkoxycarbonyl group or if .m representing the acyl group is A ₃ and A ₄ are a plurality exist in two or more, each A ₃ may be the same or different from each other, or each of A ₄ are the same as each other or A ₅ , A ₆ and A ₇ are each independently a hydrogen atom, aromatic residue, aliphatic hydrocarbon residue, cyano group, halogen atom, amide group, substituted or unsubstituted amino group, alkoxy group Represents an aryloxy group, an alkoxycarbonyl group, an arylcarbonyl group or an acyl group, and when n is 2 or more and a plurality of A ₅ and A ₆ are present, each A ₅ may be the same as or different from each other. A ₆ may be the same or different from each other). Following formula (2)

(In the formula (2), m, X ₁ , X ₂ , X ₃ , Y ₁ , Y ₂ , A ₃ , A ₄ and A ₇ represent the same meaning as in the formula (1). Independently represents an integer of 0 to 3. R ₂ and R ₃ each independently represent a hydrogen atom, an aliphatic hydrocarbon residue, a cyano group, a halogen atom, an amide group, a substituted or unsubstituted amino group, an alkoxy group, an aryloxy group A group, an alkoxycarbonyl group, an arylcarbonyl group or an acyl group, when p is 2 or more and a plurality of R ₂ are present, each R ₂ may be the same as or different from each other, q is 2 or more and R ₃ is The compound according to claim 1, wherein when a plurality of R ₃ are present, each R ₃ may be the same as or different from each other. The compound according to claim 2, wherein p and q are 1, and R ₂ and R ₃ are each independently an aliphatic hydrocarbon residue, an alkoxy group, or a substituted or unsubstituted amino group. The R ₂ and R ₃ are each independently an amino group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an amino group having two substituted alkyl groups having 1 to 6 carbon atoms. Compound. The compound according to any one of claims 1 to 4, wherein m is 1 or 2. The compound according to any one of claims 1 to 5, wherein X ₁ , X ₂ and X ₃ are sulfur atoms. The compound according to any one of claims 1 to 6, wherein one of Y ₁ and Y ₂ is a carboxyl group and the other is a carboxyl group, a cyano group, or an acyl group. The compound according to claim 7, wherein _one of Y ₁ and Y ₂ is a carboxyl group and the other is a cyano group. The compound according to any one of claims 1 to 8, wherein A ₃ , A ₄ and A ₇ are hydrogen atoms. The compound of Claim 1 represented by following formula (100), (101), (102) or (103).

The compound of Claim 1 represented by these. The photoelectric conversion element which carry | supported the compound represented by Formula (1) of Claim 1 in the thin film of the oxide semiconductor fine particle provided on the board | substrate. The solar cell containing the photoelectric conversion element of Claim 11.

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