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Oligothiophene-Bridged Bis(arylene ethynylene) Small Molecules for Solution-Processible Organic Solar Cells with High Open-Circuit Voltage

Authors

  • Qian Liu,

    1. Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong (P.R. China)
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    • These authors contributed equally to this work.

  • Dr. Hongmei Zhan,

    1. Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong (P.R. China)
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    • These authors contributed equally to this work.

  • Dr. Cheuk-Lam Ho,

    Corresponding author
    1. Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong (P.R. China)
    • Cheuk-Lam Ho, Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong (P.R. China)

      Zhiyuan Xie, State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (P.R. China)

      Feng Yan, Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong (P.R. China)

      Wai-Yeung Wong, Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong (P.R. China)

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  • Dr. Feng-Rong Dai,

    1. Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong (P.R. China)
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  • Yingying Fu,

    1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (P.R. China)
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  • Prof. Zhiyuan Xie,

    Corresponding author
    1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (P.R. China)
    • Cheuk-Lam Ho, Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong (P.R. China)

      Zhiyuan Xie, State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (P.R. China)

      Feng Yan, Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong (P.R. China)

      Wai-Yeung Wong, Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong (P.R. China)

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  • Prof. Lixiang Wang,

    1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (P.R. China)
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  • Jin-Hua Li,

    1. Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong (P.R. China)
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  • Prof. Feng Yan,

    Corresponding author
    1. Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong (P.R. China)
    • Cheuk-Lam Ho, Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong (P.R. China)

      Zhiyuan Xie, State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (P.R. China)

      Feng Yan, Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong (P.R. China)

      Wai-Yeung Wong, Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong (P.R. China)

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  • Dr. Shu-Ping Huang,

    1. Institute for Materials Chemistry and Engineering and International Research Center for Molecular Systems, Kyushu University, Fukuoka 819-0395 (Japan)
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  • Prof. Wai-Yeung Wong

    Corresponding author
    1. Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong (P.R. China)
    • Cheuk-Lam Ho, Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong (P.R. China)

      Zhiyuan Xie, State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (P.R. China)

      Feng Yan, Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong (P.R. China)

      Wai-Yeung Wong, Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong (P.R. China)

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Abstract

A new series of conjugated oligothiophene-bridged bis(arylene ethynylene) small molecules have been designed, synthesized, and characterized by photophysical, electrochemical and computational methods. These compounds were found to have optimal LUMO levels that ensure effective charge transfer from these compounds to [6,6]-phenyl-C71-butyric acid methyl ester (PC70BM). They were utilized as good electron-donor materials that can be blended with electron-acceptor PC70BM in the fabrication of solution-processed molecular bulk heterojunction (BHJ) solar cells. All of these BHJ devices showed very high open-circuit voltage (Voc) of 0.90–0.97 V, and the best power conversion efficiency achieved was 3.68 %. The high Voc is consistent with the deeper low-lying HOMO level and is relatively insensitive to the donor : acceptor blend ratio. The spin-coated thin films of these small molecules showed p-channel field-effect charge transport with the hole mobilities of up to 2.04×10−4 cm2 V−1 s−1. These compounds illuminate the potential of solution-processible small-molecular aryl acetylide compounds for efficient power generation in photovoltaic implementation.

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