期刊
ORGANIC ELECTRONICS
卷 15, 期 9, 页码 2116-2125出版社
ELSEVIER
DOI: 10.1016/j.orgel.2014.05.033
关键词
Diketopyrrolopyrrole; Small molecule; Bulk heterojunction solar cells; Power conversion efficiency; Solvent additive
资金
- Alexander von Humboldt Foundation
- Institut fur Angewandte Photophysik, Technical University, Dresden-Germany
- CSIR, New Delhi
Two D-A-D small molecules TDPP (FP) 2 and TDPP (BuP) 2 coded as CSDPP2 and CSDPP4 respectively were synthesized having same diketopyrrolopyrrole (DPP) as core acceptor and difluoro-phenyl (FP) and dibutyloxy phenyl (BuP) as different end donor units with broad absorption and suitable energy levels. We have used these small molecules as donor components along with the PC70BM as electron acceptor for the preparation of bulk heterojunction (BHJ) active layer in small molecule (SM) organic photovoltaics (OPV) test cells. The optimal power conversion efficiencies obtained with CSDPP2 and CSDPP4 are 2.26% and 3.23% when the BHJ active layer was cast from CF solvent. The PCE has been further enhanced up to 3.03% and 4.65% for CSDPP2 and CSDPP4 when the BHJ active layer was cast from CN/CF solvent. The enhancement in PCE has been explained in terms of change in crystallinity and nanoscale morphology and more balanced charge transport resulting from increased hole mobility. (C) 2014 Elsevier B.V. All rights reserved.
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