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Suppressed recombination loss in organic photovoltaics adopting a planar–mixed heterojunction architecture

Author

Listed:
  • Kui Jiang

    (City University of Hong Kong
    City University of Hong Kong
    City University of Hong Kong)

  • Jie Zhang

    (Chinese Academy of Sciences)

  • Cheng Zhong

    (Wuhan University)

  • Francis R. Lin

    (City University of Hong Kong
    City University of Hong Kong
    City University of Hong Kong)

  • Feng Qi

    (City University of Hong Kong
    City University of Hong Kong)

  • Qian Li

    (Nanjing University)

  • Zhengxing Peng

    (North Carolina State University)

  • Werner Kaminsky

    (University of Washington)

  • Sei-Hum Jang

    (University of Washington)

  • Jianwei Yu

    (Linköping University)

  • Xiang Deng

    (City University of Hong Kong
    City University of Hong Kong)

  • Huawei Hu

    (Donghua University)

  • Dong Shen

    (City University of Hong Kong)

  • Feng Gao

    (Linköping University)

  • Harald Ade

    (North Carolina State University)

  • Min Xiao

    (Nanjing University)

  • Chunfeng Zhang

    (Nanjing University
    Nanjing University)

  • Alex K.-Y. Jen

    (City University of Hong Kong
    City University of Hong Kong
    City University of Hong Kong
    University of Washington)

Abstract

At present, high-performance organic photovoltaics mostly adopt a bulk-heterojunction architecture, in which exciton dissociation is facilitated by charge-transfer states formed at numerous donor–acceptor (D-A) heterojunctions. However, the spin character of charge-transfer states originated from recombination of photocarriers allows relaxation to the lowest-energy triplet exciton (T1) at these heterojunctions, causing photocurrent loss. Here we find that this loss pathway can be alleviated in sequentially processed planar–mixed heterojunction (PMHJ) devices, employing donor and acceptor with intrinsically weaker exciton binding strengths. The reduced D-A intermixing in PMHJ alleviates non-geminate recombination at D-A contacts, limiting the chance of relaxation, thus suppressing T1 formation without sacrificing exciton dissociation efficiency. This resulted in devices with high power conversion efficiencies of >19%. We elucidate the working mechanisms for PMHJs and discuss the implications for material design, device engineering and photophysics, thus providing a comprehensive grounding for future organic photovoltaics to reach their full promise.

Suggested Citation

  • Kui Jiang & Jie Zhang & Cheng Zhong & Francis R. Lin & Feng Qi & Qian Li & Zhengxing Peng & Werner Kaminsky & Sei-Hum Jang & Jianwei Yu & Xiang Deng & Huawei Hu & Dong Shen & Feng Gao & Harald Ade & M, 2022. "Suppressed recombination loss in organic photovoltaics adopting a planar–mixed heterojunction architecture," Nature Energy, Nature, vol. 7(11), pages 1076-1086, November.
    • Handle: RePEc:nat:natene:v:7:y:2022:i:11:d:10.1038_s41560-022-01138-y
    DOI: 10.1038/s41560-022-01138-y
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    Citations

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    Cited by:

    1. 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.
    2. Xinjun He & Feng Qi & Xinhui Zou & Yanxun Li & Heng Liu & Xinhui Lu & Kam Sing Wong & Alex K.-Y. Jen & Wallace C. H. Choy, 2024. "Selenium substitution for dielectric constant improvement and hole-transfer acceleration in non-fullerene organic solar cells," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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