Effects of linking units on fused-ring electron acceptor dimers

Guilong Cai, Yiqun Xiao, Mengyang Li, Jeromy James Rech, Jiayu Wang, Kuan Liu, Xinhui Lu, Zheng Tang, Jiarong Lian, Pengju Zeng, Yiping Wang, Wei You, Xiaowei Zhan

    Research output: Journal article publicationJournal articleAcademic researchpeer-review

    8 Citations (Scopus)


    Three fused-ring electron acceptors (SIDIC, DIDIC and TIDIC) were designed and synthesized using single bond, vinylene and acetylene units linked indaceno[3,2-b]dithiophene dimers as electron-rich cores and 3-(1,1-dicyanomethylene)-5,6-difluoro-1-indanone as electron-deficient termini. These molecules exhibit strong absorption from 550 to 900 nm with large attenuation coefficients of 1.8-2.0 × 105 M-1 cm-1 and high electron mobilities of 2.2-4.9 × 10-3 cm2 V-1 s-1. In combination with wide-bandgap polymer FTAZ as a donor, organic solar cells exhibit efficiencies of 9.3-13.1%. Effects of the linking units on optical, electronic, morphologic, and photovoltaic properties were revealed. Relative to SIDIC, vinylene-bridged DIDIC shows red-shifted absorption, while acetylene-bridged TIDIC shows blue-shifted absorption. Compared with SIDIC and DIDIC, TIDIC has a lower HOMO, higher electron mobility, and higher device efficiency.

    Original languageEnglish
    Pages (from-to)13735-13741
    Number of pages7
    JournalJournal of Materials Chemistry A
    Issue number27
    Publication statusPublished - 21 Jul 2020

    ASJC Scopus subject areas

    • General Chemistry
    • Renewable Energy, Sustainability and the Environment
    • General Materials Science


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