期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 26, 期 54, 页码 12411-12417出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202000889
关键词
conjugation; fused-ring systems; heterocycles; solar cells
资金
- National Natural Science Foundation of China (NSFC) [21734001, 51825301, 21674007]
- National Research Foundation (NRF) of Korea [NRF-2016M1A2A2940911, 2019R1A6A1A11044070]
The extension of fused aromatic ring core structures is beneficial for enhancing intramolecular charge transfer and effective pi conjugation in A-D-A-type (A=acceptor; D=donor) non-fullerene acceptors (NFAs). In this work, a novel strategy involving the extension of a fused-ring core by symmetrically replicating the core unit has been developed, and a novel symmetric fused-12-ring NFA, LC81, has been synthesized. When paired with the wide-bandgap polymer donor PBT1-C, the corresponding organic solar cells (OSCs) showed a high power conversion efficiency of 12.71 %, much higher than that of the device based on the reference NFA, TPTT-4F. Moreover, the LC81-based OSC displayed a lower energy loss and a better ambient stability than the TPTT-4F-based device. Our results indicate that the extension of the fused-ring core by the symmetric replicating core unit strategy is an effective approach to promoting the photovoltaic characteristics of A-D-A-type NFAs.
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