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Regio-Specific Selenium Substitution in Non-Fullerene Acceptors for Efficient Organic Solar Cells

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journal contribution
posted on 29.07.2019, 17:13 by Francis Lin, Lijian Zuo, Ke Gao, Ming Zhang, Sae Byeok Jo, Feng Liu, Alex K.-Y. Jen
A set of isomeric ladder type non-fullerene acceptors (NFAs), SRID-4F and TRID-4F, was designed and synthesized to systematically investigate the structure–property relationship of selenium substitution on A-D-A type NFAs. It was found that regio-specific selenium substitution not only affects the optical and electrochemical properties but also changes the morphology of thin films. Photovoltaic devices based on SRID-4F showed a high power conversion efficiency of >13% when paired with polymeric donor PBDB-T-2F.