Efficient Fused-Ring Extension of A–D–A-Type Non-Fullerene Acceptors by a Symmetric Replicating Core Unit Strategy

Tian Xia, Chao Li, Hwa Sook Ryu, Jing Guo, Jie Min, Han Young Woo, Yanming Sun

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The extension of fused aromatic ring core structures is beneficial for enhancing intramolecular charge transfer and effective π 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.

Original languageEnglish
Pages (from-to)12411-12417
Number of pages7
JournalChemistry - A European Journal
Volume26
Issue number54
DOIs
Publication statusPublished - 2020 Sep 25

Keywords

  • conjugation
  • fused-ring systems
  • heterocycles
  • solar cells

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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