期刊
CHINESE JOURNAL OF CHEMISTRY
卷 38, 期 7, 页码 697-702出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cjoc.201900495
关键词
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资金
- National Natural Science Foundation of China (NSFC) [51503135, 51573120, 21734009, 91633301]
- Jiangsu Provincial Natural Science Foundation [BK20150332]
- Collaborative Innovation Center of Suzhou Nano Science Technology
- DOE, Office of Science
- DOE, Office of Basic Energy Sciences
of main observation and conclusion Small molecular acceptors (SMAs) BTC-2F and BTH-2F, based on heptacyclic benzodi(cyclopentadithiophene) electron-donating core (CBT) with chlorinated-thienyl conjugated and thienyl conjugated side chains, respectively, are designed and synthesized. Compared with non-chlorine acceptor BTH-2F, BTC-2F exhibits slightly blue-shifted absorption spectra, similar the lowest unoccupied molecular orbital (LUMO) (-3.91 eV), deeper highest occupied molecular orbital (HOMO) energy level and higher electron mobility than that of BTH-2F. PM6, a wide bandgap polymer, is selected as the donor material to construct bulk heterojunction polymer solar cells processed with nonhalogenated solvent toluene. The optimized PM6:BTC-2F-based device presents a 12.9% power conversion efficiency (PCE), while the PCE of PM6:BTH-2F-based device is only 11.3%. The results suggest that it is an effective strategy to optimize the photoelectric properties of SMAs by incorporating chlorine atom into the conjugated side chains.
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