期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 38, 期 23, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201700405
关键词
chalcogen annulation effect; molecular configuration control; nonfullerene acceptors; nonfullerene solar cells; perylene diimide trimers
资金
- NSFC [51573107, 91633301, 21432005]
- Foundation of State Key Laboratory of Polymer Materials Engineering [sklpme2017-2-04]
This communication reports the synthesis of two novel chalcogen-atom-annulated perylene diimide (PDI) trimers with twisted structures, TriPDI-S and TriPDI-Se, for efficient nonfullerene polymer solar cells. TriPDI-Se exhibits more compact molecular arrangement due to the stronger intermolecular interactions induced by the selenium atom. This selenium annulation endows TriPDI-Se with improved absorption and crystallinity in its blend film. The resulting devices exhibit enhanced J(sc) of 17.15 mA cm(-2) and fill factor (FF) of 66.8%, which are much higher than those of TriPDI-S devices (J(sc) = 16.71 mA cm(-2); FF = 63.6%). Although TriPDI-Se exhibits lower-lying energy levels, TriPDI-Se devices still obtain a higher V-oc of 0.77 V compared to TriPDI-S devices (V-oc = 0.74 V), which is mainly originated from the reduced recombination in the related devices. Finally, the power conversion efficiency is significantly elevated from 7.86% for TriPDI-S devices to 8.82% for TriPDI-Se devices.
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