申请人:National University Corporation of Hiroshima University
公开号:US20140000716A1
公开(公告)日:2014-01-02
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, R
1
, R
2
, R
3
, and R
4
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.
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.
Effect of Oxygen-Containing Functional Side Chains on the Electronic Properties and Photovoltaic Performances in a Thiophene-Thiazolothiazole Copolymer System
and/or ester groups as the sidechain. An introduction of the alkoxy groups raised the HOMO energy level of the polymers, whereas the introduction of the ester groups lowered the LUMO energy level. It is found that, interestingly, in the monomers the electroniceffect of the ester group was more significant than that of the alkoxy groups, whereas in the polymers the effect of the alkoxy group was more
Reducing alkyl length slightly in thiazolothiazole acceptors significantly affects solubility, leading to decreased performance. Our findings indicate a high sensitivity of this types of acceptor solubility to alkyl side chains.