Patent ID: 8383831

Claim:
A dye for a dye-sensitized solar cell, represented by the Formula [II], wherein each of R 21 and R 22 represents a hydrogen atom or an alkyl group, or R 21 and R 22 may be bonded to each other and form a cyclopentane ring or a cyclohexane ring, R 23 represents an alkylene group having 1 to 3 carbon atoms, Y 2 represents an acidic group possessing a pKa of less than 6, R 24 represents an aliphatic hydrocarbon residue, an aromatic hydrocarbon residue or a heterocyclic ring residue, R 25 represents an alkyl group or an aralkyl group, provided that at least one of R 24 and R 25 represents a group of the following formula, —(CH 2 ) n —Y in which n is an integer of 4 to 23 and Y is an acidic group possessing a pKa of less than 6, L 2 represents a conjugated methine group, and a steric configuration of two heterocyclic five-membered rings containing a sulfur atom each may be any one of Z-configuration and E-configuration.