Organic photoelectric conversion element, and solar cell and optical sensor array each using same

1. An organic photoelectric conversion element comprising, on a transparent substrate, a transparent first electrode; a photoelectric conversion layer containing a p-type organic semiconductor material and an n-type organic semiconductor material; and a second electrode in this sequence,

wherein the photoelectric conversion layer comprises a conjugated polymer compound having a partial structure represented by the following formula (1) as the p-type organic semiconductor material:

wherein R1 and R2 each independently represent a hydrogen atom, an alkyl group having 1 to 30 carbon atoms which may be substituted, an alkoxy group having 1 to 30 carbon atoms which may be substituted, an alkyl ester group having 2 to 30 carbon atoms which may be substituted, a halogen atom, an alkoxycarbonyl group having 2 to 30 carbon atoms which may be substituted, an alkylaminocarbonyl group having 2 to 40 carbon atoms which may be substituted, an acyl group having 2 to 30 carbon atoms which may be substituted, an amino group which may be substituted, an acylamino group having 2 to 30 carbon atoms which may be substituted, an aryl group having 6 to 30 carbon atoms which may be substituted, or a heterocyclic group having 3 to 30 carbon atoms which may be substituted;

X1 and X2 each independently represent:

wherein R3 to R7 each independently represent a hydrogen atom, an alkyl group having 1 to 30 carbon atoms which may be substituted, an alkoxy group having 1 to 30 carbon atoms which may be substituted, an alkyl ester group having 2 to 30 carbon atoms which may be substituted, a halogen atom, an alkoxycarbonyl group having 2 to 30 carbon atoms which may be substituted, an alkylaminocarbonyl group having 2 to 40 carbon atoms which may be substituted, an acyl group having 2 to 30 carbon atoms which may be substituted, an amino group which may be substituted, an acylamino group having 2 to 30 carbon atoms which may be substituted, an aryl group having 6 to 30 carbon atoms which may be substituted, or a heterocyclic group having 3 to 30 carbon atoms which may be substituted; and when R6 and R7 are aryl groups, they may be bonded to each other and form a ring;

provided that X1 and X2 do not simultaneously represent:

2. The organic photoelectric conversion element according to claim 1 , wherein at least one of X1 and X2 represents:

3. The organic photoelectric conversion element according to claim 2 , wherein at least one of X1 and X2 represents:

4. The organic photoelectric conversion element according to claim 3 , wherein at least one of X1 and X2 represents:

5. The organic photoelectric conversion element according to claim 1 , wherein at least one of R6 and R7 represents an aryl group having 6 to 30 carbon atoms which may be substituted, or a branched alkyl group having 4 to 30 carbon atoms which may be substituted.

6. The organic photoelectric conversion element according to claim 5 , wherein R6 and R7 both represent an aryl group having 6 to 30 carbon atoms which may be substituted, or a branched alkyl group having 4 to 30 carbon atoms which may be substituted.

7. The organic photoelectric conversion element according to claim 1 , wherein R6 and R7 both represent a substituent substituted with a halogen atom, a halogenated alkyl group having 1 to 20 carbon atoms, a cyano group, an acyl group having 2 to 20 carbon atoms, or a nitro group.

8. The organic photoelectric conversion element according to claim 1 , wherein the conjugated polymer compound having a partial structure represented by formula (1), further contains a partial structure represented by the following formula (3):

9. The organic photoelectric conversion element according to claim 8 , wherein the conjugated polymer compound having a partial structure represented by formula (1) further contains a partial structure represented by the following formula (3′):

wherein in formula (3′), R16 and R17 each independently represent a hydrogen atom, an alkyl group having 1 to 30 carbon atoms which may be substituted, an alkoxy group having 1 to 30 carbon atoms which may be substituted, an alkyl ester group having 2 to 30 carbon atoms which may be substituted, a halogen atom, an alkoxycarbonyl group having 2 to 30 carbon atoms which may be substituted, an alkylaminocarbonyl group having 2 to 40 carbon atoms which may be substituted, an acyl group having 2 to 30 carbon atoms which may be substituted, an amino group which may be substituted, or an acylamino group having 2 to 30 carbon atoms which may be substituted.

10. The organic photoelectric conversion element according to claim 1 , wherein the conjugated polymer compound having a partial structure represented by formula (1) further comprises a partial structure represented by the following formula (2) or formula (2′):

wherein T represents an atom selected from carbon, silicon and germanium; R8 and R11 each independently represent a hydrogen atom, a halogen atom or an alkyl group having 1 to 20 carbon atoms which may be substituted; R9 and R10 each independently represent an alkyl group having 1 to 20 carbon atoms which may be substituted;

wherein R12 and R15 each independently represent a hydrogen atom, a halogen atom, or an alkyl group having 1 to 20 carbon atoms which may be substituted; and R13 and R14 each independently represent an alkyl group having 1 to 20 carbon atoms which may be substituted, or an alkoxy group having 1 to 20 carbon atoms which may be substituted.

11. The organic photoelectric conversion element according to claim 1 , wherein the photoelectric conversion layer is a photoelectric conversion layer produced by a solution coating method.

12. The organic photoelectric conversion element according to claim 1 , wherein the organic photoelectric conversion element has an inversion layer configuration in which the work function of the first electrode is smaller than the work function of the second electrode.

13. A solar cell comprising the organic photoelectric conversion element according to claim 1 .

14. A photosensor array comprising the organic photoelectric conversion elements according to claim 1 disposed in an array form.