Dye-sensitized solar cell, photoelectric conversion element, and dye for use in the solar cell and the element
View Patent ↗Provided are a squarylium dye having a carboxyindolenine structure and an N-alkyl substituent, and a photoelectric conversion element having high photoelectric conversion efficiency in a near-infrared region and a dye-sensitized solar cell, both of which are produced using the squarylium dye. The photoelectric conversion element or dye-sensitized solar cell uses a compound represented by the formula (1) as the squarylium dye. In the formula (1), R 1 and R 2 represent a substituted or unsubstituted C5 to C30 alkyl group; X represents C(CH 3 ) 2 ; and A and B represent a carboxy group.
1. A dye-sensitized solar cell, comprising a squarylium dye, wherein the squarylium dye comprises at compound represented by the following formula (1):
wherein, R 1 and R 2 each represent a substituted or unsubstituted C5 to C30 alkyl group; X represents C(CH 3 ) 2 ; and A and B each represent a carboxy group.
2. A dye-sensitized solar cell according to claim 1 , wherein R 1 and R 2 in the formula (1) each represent a substituted ter unsubstituted C5 to C18 alkyl group.
3. A dye-sensitized solar cell according to claim 1 , wherein R 1 and R 2 in the formula (1) each represent a substituted or unsubstituted C8 to C12 alkyl group.
4. A dye-sensitized solar cell according to claim 1 , wherein the dye-sensitized solar cell comprises a squarylium dye represented by the formula (1) and a squarylium dye represented by the following formula (2):
where R 3 represents a substituted or unsubstituted C2 to C30 alkyl group.
5. A dye-sensitized solar cell, comprising a squarylium dye, wherein the squarylium dye comprises a squarylium dye having a carboxyindolenine skeleton represented by the following formula (2):
where R 3 represents n-C 12 H 25 .
6. A photoelectric conversion element, comprising a squarylium dye, wherein the squarylium dye comprises a compound represented by following formula (1):
wherein, R 1 and R 2 each represent a substituted or unsubstituted C5 to C30 alkyl group; X represents C(CH 3 ) 2 ; and A and B each represent a carboxy group.
7. A squarylium dye for a photoelectric conversion element or a dye-sensitized solar cell, which is represented by the following formula (1):
wherein, R 1 and R 2 represent a substituted or unsubstituted C5 to C30 alkyl group; X represents C(CH 3 ) 2 ; and A and B each represent a carboxy group.
8. A squarylium dye for a photoelectric conversion element or a dye-sensitized solar cell, which is represented by the following formula (2):
where R represents n-C 12 H 25 .
9. A dye-sensitized solar cell according to claim 4 , wherein R 3 in the formula (2) represents a branched or linear C12 alkyl group.