期刊
NEW JOURNAL OF CHEMISTRY
卷 44, 期 30, 页码 13093-13099出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nj01733g
关键词
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资金
- National Natural Science Foundation of China [21875106, 61605075]
- Natural Science Foundation of Jiangsu Province [BK20181373]
Two perylenediimide (PDI) derivatives (FP(4)TT2T and FP(4)3T) with extended conjugation have been successfully synthesized. Due to their long fused D-A (D: donor and A: acceptor) molecular structures, PDI-based heteroacenes have rigid backbones and exhibit strong light absorption in the 300-600 nm range. With the contribution from the PDI moiety with strong electron affinity, the molecules possess low energy levels of LUMOs (ca.-3.7 eV), fitting well as acceptors for fullerene-free organic solar cells (OSCs). OSC devices containing FP(4)TT2T and FP(4)3T were fabricated and fully characterized. It is found that the geometric twist in PDI-based heteroacenes as acceptors could enhance the performance of OSC devices. OSCs based on FP(4)3T with a more twisted geometry achieved a power conversion efficiency of 6.05%, which is higher than those based on the FP(4)TT2T counterpart.
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