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Suppressing electron-phonon coupling in organic photovoltaics for high-efficiency power conversion

Author

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  • Yuanyuan Jiang

    (Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Yixin Li

    (Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences)

  • Feng Liu

    (Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences)

  • Wenxuan Wang

    (Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Wenli Su

    (Beijing Normal University)

  • Wuyue Liu

    (Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences)

  • Songjun Liu

    (Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Wenkai Zhang

    (Beijing Normal University)

  • Jianhui Hou

    (Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Shengjie Xu

    (Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences)

  • Yuanping Yi

    (Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences)

  • Xiaozhang Zhu

    (Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

Abstract

The nonradiative energy loss (∆Enr) is a critical factor to limit the efficiency of organic solar cells. Generally, strong electron-phonon coupling induced by molecular motion generates fast nonradiative decay and causes high ∆Enr. How to restrict molecular motion and achieve a low ∆Enr is a sticking point. Herein, the free volume ratio (FVR) is proposed as an indicator to evaluate molecular motion, providing new molecular design rationale to suppress nonradiative decay. Theoretical and experimental results indicate proper proliferation of alkyl side-chain can decrease FVR and restrict molecular motion, leading to reduced electron-phonon coupling while maintaining ideal nanomorphology. The reduced FVR and favorable morphology are simultaneously obtained in AQx-6 with pinpoint alkyl chain proliferation, achieving a high PCE of 18.6% with optimized VOC, JSC and FF. Our study discovered aggregation-state regulation is of great importance to the reduction of electron-phonon coupling, which paves the way to high-efficiency OSCs.

Suggested Citation

  • Yuanyuan Jiang & Yixin Li & Feng Liu & Wenxuan Wang & Wenli Su & Wuyue Liu & Songjun Liu & Wenkai Zhang & Jianhui Hou & Shengjie Xu & Yuanping Yi & Xiaozhang Zhu, 2023. "Suppressing electron-phonon coupling in organic photovoltaics for high-efficiency power conversion," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-40806-9
    DOI: 10.1038/s41467-023-40806-9
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