期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 5, 期 10, 页码 5106-5114出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta11240d
关键词
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资金
- National Natural Science Foundation of China (NSFC) [51422306, 51503135, 51573120, 91333204]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Jiangsu Provincial Natural Science Foundation [BK20150332]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [15KJB430027]
- Ministry of Science and Technology of China (973 project) [2014CB643501]
A 1,1'-vinylene-fused indacenodithiophene (IDTV) donor unit with 22 pi-conjugated electrons was synthesized. A ladder-type D-A copolymer PIDTV-ffBT using IDTV as the donor unit and 5,6-difluorobenzothiadiazole (ffBT) as the acceptor unit was developed for application as a donor material in polymer solar cells (PSCs). Compared to other analogue polymers, PIDTV-ffBT possesses a two-dimensional conjugated multi-electron fused ring, excellent planarity and close pi-pi stacking, leading to a higher light harvesting coefficient, an enhanced charge carrier mobility of 0.032 cm(2) V-1 s(-1) and improved photovoltaic performance. The PSCs based on PIDTV-ffBT: PC71BM achieved a promising power conversion efficiency (PCE) of 7.3% with a high short-circuit current density (J(sc)) of 17.1 mA cm(-2). These results indicate that the introduction of the 1,1'-vinylene-fused system into IDTV for ladder-type polymers is an effective strategy to enhance the light absorption coefficient and improve charge carrier mobility for high efficiency PSCs.
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