Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China
Keywords:
-
CLC:
PACS:
-
DOI:
10.7502/j.issn.1674-3962.2015.02.08
DocumentCode:
Abstract:
A new donor material PTT-FTQ for organic solar cell (OSC) was synthesized and investigated. With the PTT-FTQ: PCBM as active layer, the factors which influenced the performance of OSC such as the ratio of donor/acceptor, the film thickness of active layer, the various acceptors and the additive were studied and optimized. The results showed that when the ratio of donor/acceptor was 1:2, a better interpenetrating network between PTT-FTQ and PC61BM was formed and the active layer has a more smooth surface morphology. When the film thickness of active layer was 120 nm, the power conversion efficiency (PCE) of OSC was 2.12%. Using 1, 8-diiodooctane (DIO) as the additive, PCE of OSC was 2.18%. The current density of OSC with PC71BM as acceptor is much greater than that of PC61BM while the voltage is slightly lower. This is mainly due to PC71BM has lower LUMO energy level and stronger spectral absorption. High PCE of 2.78% was achieved with PC71BM as acceptor.