Facile synthesis of high-performance nonfullerene acceptor isomers via a one stone two birds strategy

Tengfei Li, Langxuan Yang, Yiqun Xiao, Kuan Liu, Jiayu Wang, Xinhui Lu, Xiaowei Zhan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

17 Citations (Scopus)

Abstract

Two isomeric fused undecacyclic electron acceptors (FUIC and i-FUIC) are designed and synthesized via a one stone two birds strategy based on core unit 4TT (four thienothiophene units condensed with three cyclopentadienyl rings) and end groups 2FIC (2-(5,6-difluoro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)-malononitrile). The only difference is the two attachment positions between 4TT and 2FIC, α, α-positions for FUIC and α, β-positions for i-FUIC. FUIC exhibits stronger and red-shifted absorption with an ultra-narrow bandgap of 1.22 eV (1.28 eV for i-FUIC), a down-shifted lowest unoccupied molecular orbital energy level of -4.06 eV (-3.99 eV for i-FUIC), the same highest occupied molecular orbital energy level of -5.31 eV and a higher electron mobility of 6.8 × 10-4 cm2 V-1 s-1 (3.0 × 10-4 cm2 V-1 s-1 for i-FUIC). Organic solar cells based on a blend of PTB7-Th:FUIC exhibit a power conversion efficiency as high as 11.2% with a high fill factor of 70.6%, higher than that of PTB7-Th:i-FUIC (10.3%).

Original languageEnglish
Pages (from-to)20667-20674
Number of pages8
JournalJournal of Materials Chemistry A
Volume7
Issue number36
DOIs
Publication statusPublished - Aug 2019

ASJC Scopus subject areas

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

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