期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 8, 期 44, 页码 23239-23247出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta08830g
关键词
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资金
- Shen Zhen Technology and Innovation Commission [JCYJ20170413173814007, JCYJ20170818113905024]
- Hong Kong Research Grants Council [R6021-18, 16305915, 16322416, 606012, 16303917]
- Hong Kong Innovation and Technology Commission [ITC-CNERC14SC01, ITS/471/18]
- National Natural Science Foundation of China (NSFC) [91433202]
- National Key Research and Development Program of China - MOST [2019YFA0705900]
- ONR [N000141712204, N000142012155]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
Y6-type non-fullerene acceptors (NFAs) with an acceptor-donor-acceptor '-donor-acceptor (A-D-A '-D-A) structure have been very popular in the field of organic solar cells (OSCs) due to their excellent performances. In this study, two novel NFAs, BTPS-4F and BTPS-4Cl were designed by incorporating undecylthio side chains into a thienothiophene moiety and connecting it to two different halogenated 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile end groups (2F-IC and 2Cl-IC) respectively. When blended with a donor polymer, PM6, BTPS-4F-based devices achieved a high power conversion efficiency (PCE) of up to 16.2% with an open-circuit voltage (V-OC) of 0.82 V, a short-circuit current density (J(SC)) of 25.2 mA cm(-2) and a fill factor (FF) of 0.78, while BTPS-4Cl-based devices achieved an inferior PCE of 13.5%. This is the first time alkylthio chains are employed on Y6-like NFAs to achieve high-performance OSCs. Subsequent characterization showed that the upshifted energy level of BTPS-4F and the better intermolecular packing in PM6:BTPS-4F blends are the major reasons for the enhanced performance of BTPS-4F-based devices over BTPS-4Cl-based ones. This work provides high-performance non-fullerene acceptors for OSCs and demonstrates a promising molecular design strategy that can effectively regulate their energy levels and morphology.
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