PDI-based heteroacenes as acceptors for fullerene-free solar cells: Importance of their twisted geometry

Huaqing Chen, Ling Wang, Hua Sun, Qian Liu, Xiao Tan, Shenglong Sang, Bo Wu, Cong Zhang, Fei Chen, Xiao Chun Hang, Zhi Kuan Chen

Research output: Journal PublicationArticlepeer-review

1 Citation (Scopus)

Abstract

Two perylenediimide (PDI) derivatives (FP4TT2T and FP43T) 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 FP4TT2T and FP43T 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 FP43T with a more twisted geometry achieved a power conversion efficiency of 6.05%, which is higher than those based on the FP4TT2T counterpart.

Original languageEnglish
Pages (from-to)13093-13099
Number of pages7
JournalNew Journal of Chemistry
Volume44
Issue number30
DOIs
Publication statusPublished - 14 Aug 2020

ASJC Scopus subject areas

  • Catalysis
  • Chemistry (all)
  • Materials Chemistry

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