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Low Band-Gap Conjugated Polymers with Strong Interchain Aggregation and Very High Hole Mobility Towards Highly Efficient Thick-Film Polymer Solar Cells

Authors

  • Zhenhui Chen,

    1. Institute of Polymer Optoelectronic, Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou, P. R. China
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    • These authors contributed equally to this work

  • Ping Cai,

    1. Institute of Polymer Optoelectronic, Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou, P. R. China
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    • These authors contributed equally to this work

  • Junwu Chen,

    Corresponding author
    1. Institute of Polymer Optoelectronic, Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou, P. R. China
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  • Xuncheng Liu,

    1. Institute of Polymer Optoelectronic, Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou, P. R. China
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  • Lianjie Zhang,

    1. Institute of Polymer Optoelectronic, Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou, P. R. China
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  • Linfeng Lan,

    1. Institute of Polymer Optoelectronic, Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou, P. R. China
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  • Junbiao Peng,

    1. Institute of Polymer Optoelectronic, Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou, P. R. China
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  • Yuguang Ma,

    1. Institute of Polymer Optoelectronic, Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou, P. R. China
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  • Yong Cao

    1. Institute of Polymer Optoelectronic, Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou, P. R. China
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Abstract

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Absorption spectra of polymer FBT-Th4(1,4) (M n = 46.4 Kg/mol, E g = 1.62 eV, and HOMO = –5.36 eV) indicate strong interchain aggregation ability. High hole mobilities up to 1.92 cm2(V s)–1 are demonstrated in OFETs fabricated under mild conditions. Inverted solar cells with active layer thicknesses ranging from 100 to 440 nm display PCEs exceeding 6.5%, with the highest efficiency of 7.64% achieved with a 230 nm thick active layer.

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