Polymer and photoelectric conversion element
AssigneesJx Nippon Oil & Energy Corporation, National University of Corporation Hiroshima University
InventorsSeunghun Eu, Tsuyoshi Asano, Itaru Osaka, Kazuo Takimiya
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Abstract
A photoelectric conversion element has a structure where a hole transport layer, a photoelectric conversion layer, and an electron transport layer are held between a first electrode and a second electrode. The photoelectric conversion layer is a bulk heterojunction layer, and fullerene or a fullerene derivative is used as an n-type organic semiconductor. As a p-type organic semiconductor, a polymer represented by the following Expression is used. In the Expression, R1, R2, R3, and R4 each independently represent any one of a branched alkyl group, a linear alkyl group, an alkyl ester group, a carboxy alkyl group, and an alkoxy group. Independently, X is any one of S, O, and N.
Claims5
A polymer comprising a repeating unit that includes a five-membered ring including a thiazolothiazole framework and a heteroatom, which is expressed by the following Expression (1),
- wherein a number average molecular weight is not less than 15,000 and not more than 48,000 in terms of polystyrene,
- wherein hole mobility measured by a SCLC method is 7.5*10−5 cm2/Vs or more,
- wherein solubility with respect to 1 mL of chlorobenzene is 10 mg or more,
- wherein R1, R2, R3, and R4 each independently represent any one of a branched alkyl group, a linear alkyl group, an alkyl ester group, a carboxy alkyl group, and an alkoxy group,
- wherein a percentage of linear alkyl groups in R1, R2, R3, and R4 does not exceed 50 percent,
- wherein X is independently any one of S, O, and N, and
- wherein n is an integer of 1 or more.
A photoelectric conversion element comprising:
- a p-type organic semiconductor;
- a photoelectric conversion layer having the p-type organic semiconductor and an n-type organic semiconductor that forms bulk heterojunction;
- a first electrode electrically connected to the photoelectric conversion layer on a side of a light-receiving surface of the photoelectric conversion layer;
- and a second electrode electrically connected to the photoelectric conversion layer on a side of the photoelectric conversion layer opposite to the light-receiving side thereof,
- wherein the p-type organic semiconductor is a polymer comprising a repeating unit that includes a five-membered ring including a thiazolothiazole framework and a heteroatom, which is expressed by the following Expression (1), a number average molecular weight of the polymer being not less than 15,000 and not more than 48,000 in terms of polystyrene, hole mobility of the polymer measured by a SCLC method being 7.5*10−5 cm2/Vs or more, solubility of the polymer with respect to 1 mL of chlorobenzene being 10 mg or more,
- wherein R1, R2, R3, and R4 each independently represent any one of a branched alkyl group, a linear alkyl group, an alkyl ester group, a carboxy alkyl group, and an alkoxy group,
- wherein a percentage of linear alkyl groups in R1, R2, R3, and R4 does not exceed 50 percent,
- wherein X is independently any one of S, O, and N, and
- wherein n is an integer of 1 or more.
Dependencies are inferred from the claim text.