期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 5, 期 19, 页码 9396-9401出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta02582c
关键词
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资金
- National Natural Science Foundation of China [21674093, 51620105006]
- 973 program [2014CB643503]
- International Science and Technology Cooperation Program of China (ISTCP) [2016YFE0102900]
- Zhejiang Natural Science Fund for Distinguished Young Scholars [LR17E030001]
- Young 1000 Talents Global Recruitment Program of China
- 100 Talents Program of Zhejiang University
In this work, we present two new electron acceptors, TriPDI and Fused-TriPDI, in which three perylene diimide (PDI) moieties are tethered to a benzotrithiophene (BTT) core via either single bonds (TriPDI) or ring-fusion (Fused-TriPDI). TriPDI connects three PDIs to BTT via carbon-carbon single bonds, resulting in a rotatable and highly twisted skeleton. Instead, Fused-TriPDI, made through oxidative ring-fusion of TriPDI, exhibits good structural rigidity and planarity, as well as effective conjugation between PDI and BTT. As a result, the fused molecule shows up-shifted energy levels, and enhanced absorption and charge mobility over the unfused one. The polymer solar cells (PSCs) with a PTB7-Th: Fused-TriPDI blend show the best power conversion efficiency of 6.19%, which is around three times higher than that with PTB7-Th: TriPDI.
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