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Ultrafast hole transfer mediated by polaron pairs in all-polymer photovoltaic blends

Author

Listed:
  • Rui Wang

    (Nanjing University)

  • Yao Yao

    (South China University of Technology)

  • Chunfeng Zhang

    (Nanjing University)

  • Yindong Zhang

    (Nanjing University)

  • Haijun Bin

    (CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences)

  • Lingwei Xue

    (CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences)

  • Zhi-Guo Zhang

    (CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences
    Beijing University of Chemical Technology)

  • Xiaoyu Xie

    (Nanjing University)

  • Haibo Ma

    (Nanjing University)

  • Xiaoyong Wang

    (Nanjing University)

  • Yongfang Li

    (CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences)

  • Min Xiao

    (Nanjing University
    University of Arkansas)

Abstract

The charge separation yield at a bulk heterojunction sets the upper efficiency limit of an organic solar cell. Ultrafast charge transfer processes in polymer/fullerene blends have been intensively studied but much less is known about these processes in all-polymer systems. Here, we show that interfacial charge separation can occur through a polaron pair-derived hole transfer process in all-polymer photovoltaic blends, which is a fundamentally different mechanism compared to the exciton-dominated pathway in the polymer/fullerene blends. By utilizing ultrafast optical measurements, we have clearly identified an ultrafast hole transfer process with a lifetime of about 3 ps mediated by photo-excited polaron pairs which has a markedly high quantum efficiency of about 97%. Spectroscopic data show that excitons act as spectators during the efficient hole transfer process. Our findings suggest an alternative route to improve the efficiency of all-polymer solar devices by manipulating polaron pairs.

Suggested Citation

  • Rui Wang & Yao Yao & Chunfeng Zhang & Yindong Zhang & Haijun Bin & Lingwei Xue & Zhi-Guo Zhang & Xiaoyu Xie & Haibo Ma & Xiaoyong Wang & Yongfang Li & Min Xiao, 2019. "Ultrafast hole transfer mediated by polaron pairs in all-polymer photovoltaic blends," Nature Communications, Nature, vol. 10(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-08361-4
    DOI: 10.1038/s41467-019-08361-4
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    Cited by:

    1. Yafei Wang & Zhong Zheng & Jianqiu Wang & Pengqing Bi & Zhihao Chen & Junzhen Ren & Cunbin An & Shaoqing Zhang & Jianhui Hou, 2023. "Organic laser power converter for efficient wireless micro power transfer," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    2. Michael B. Price & Paul A. Hume & Aleksandra Ilina & Isabella Wagner & Ronnie R. Tamming & Karen E. Thorn & Wanting Jiao & Alison Goldingay & Patrick J. Conaghan & Girish Lakhwani & Nathaniel J. L. K., 2022. "Free charge photogeneration in a single component high photovoltaic efficiency organic semiconductor," Nature Communications, Nature, vol. 13(1), pages 1-10, December.

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