Asymmetric A-D-π-A-type nonfullerene small molecule acceptors for efficient organic solar cells

Xueshan Li, Chao Li, Linglong Ye, Kangkang Weng, Huiting Fu, Hwa Sook Ryu, Donghui Wei, Xiaobo Sun, Han Young Woo, Yanming Sun

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

There has been significant progress with regard to research on nonfullerene small molecule acceptors (SMAs) during the past several years. Typically, high-performance nonfullerene SMAs are based on symmetric A-D-A or A-π-D-π-A structural frameworks. In this study, a novel asymmetric nonfullerene SMA, TTPT-T-2F, with an A-D-π-A structure is rationally designed and synthesized. In addition, a symmetric A-D-A-type nonfullerene SMA, IT-2F, and a symmetric A-π-D-π-A-type nonfullerene SMA, T-TPT-T-2F, are also synthesized for comparison. When PBT1-C is employed as a polymer donor, a promising power conversion efficiency (PCE) of 12.71% is achieved for TTPT-T-2F-based organic solar cells (OSCs), which surpasses those of devices based on IT-2F (PCE = 10.54%) and T-TPT-T-2F (PCE = 10.71%). Favorable phase separation toward efficient and more balanced charge transport accounts for the higher PCE achieved in the PBT1-C:TTPT-T-2F device. Our results demonstrate that a small molecule acceptor with an A-D-π-A structural framework is a promising class of nonfullerene acceptors for OSCs.

Original languageEnglish
Pages (from-to)19348-19354
Number of pages7
JournalJournal of Materials Chemistry A
Volume7
Issue number33
DOIs
Publication statusPublished - 2019 Jan 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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