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Fast charge separation in a non-fullerene organic solar cell with a small driving force

Author

Listed:
  • Jing Liu

    (The Hong Kong University of Science and Technology)

  • Shangshang Chen

    (The Hong Kong University of Science and Technology)

  • Deping Qian

    (Linköping University)

  • Bhoj Gautam

    (North Carolina State University)

  • Guofang Yang

    (The Hong Kong University of Science and Technology
    State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University)

  • Jingbo Zhao

    (The Hong Kong University of Science and Technology)

  • Jonas Bergqvist

    (Linköping University)

  • Fengling Zhang

    (Linköping University)

  • Wei Ma

    (State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University)

  • Harald Ade

    (North Carolina State University)

  • Olle Inganäs

    (Linköping University)

  • Kenan Gundogdu

    (North Carolina State University)

  • Feng Gao

    (Linköping University)

  • He Yan

    (The Hong Kong University of Science and Technology
    The Hong Kong University of Science and Technology-Shenzhen Research Institute No. 9, Yuexing 1st Road)

Abstract

Fast and efficient charge separation is essential to achieve high power conversion efficiency in organic solar cells (OSCs). In state-of-the-art OSCs, this is usually achieved by a significant driving force, defined as the offset between the bandgap (Egap) of the donor/acceptor materials and the energy of the charge transfer (CT) state (ECT), which is typically greater than 0.3 eV. The large driving force causes a relatively large voltage loss that hinders performance. Here, we report non-fullerene OSCs that exhibit ultrafast and efficient charge separation despite a negligible driving force, as ECT is nearly identical to Egap. Moreover, the small driving force is found to have minimal detrimental effects on charge transfer dynamics of the OSCs. We demonstrate a non-fullerene OSC with 9.5% efficiency and nearly 90% internal quantum efficiency despite a low voltage loss of 0.61 V. This creates a path towards highly efficient OSCs with a low voltage loss.

Suggested Citation

  • Jing Liu & Shangshang Chen & Deping Qian & Bhoj Gautam & Guofang Yang & Jingbo Zhao & Jonas Bergqvist & Fengling Zhang & Wei Ma & Harald Ade & Olle Inganäs & Kenan Gundogdu & Feng Gao & He Yan, 2016. "Fast charge separation in a non-fullerene organic solar cell with a small driving force," Nature Energy, Nature, vol. 1(7), pages 1-7, July.
    • Handle: RePEc:nat:natene:v:1:y:2016:i:7:d:10.1038_nenergy.2016.89
    DOI: 10.1038/nenergy.2016.89
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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. Marios Maimaris & Allan J. Pettipher & Mohammed Azzouzi & Daniel J. Walke & Xijia Zheng & Andrei Gorodetsky & Yifan Dong & Pabitra Shakya Tuladhar & Helder Crespo & Jenny Nelson & John W. G. Tisch & A, 2022. "Sub-10-fs observation of bound exciton formation in organic optoelectronic devices," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    3. Xian’e Li & Qilun Zhang & Jianwei Yu & Ye Xu & Rui Zhang & Chuanfei Wang & Huotian Zhang & Simone Fabiano & Xianjie Liu & Jianhui Hou & Feng Gao & Mats Fahlman, 2022. "Mapping the energy level alignment at donor/acceptor interfaces in non-fullerene organic solar cells," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    4. Jiehao Fu & Qianguang Yang & Peihao Huang & Sein Chung & Kilwon Cho & Zhipeng Kan & Heng Liu & Xinhui Lu & Yongwen Lang & Hanjian Lai & Feng He & Patrick W. K. Fong & Shirong Lu & Yang Yang & Zeyun Xi, 2024. "Rational molecular and device design enables organic solar cells approaching 20% efficiency," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    5. Jinfeng Huang & Tianyi Chen & Le Mei & Mengting Wang & Yuxuan Zhu & Jiting Cui & Yanni Ouyang & Youwen Pan & Zhaozhao Bi & Wei Ma & Zaifei Ma & Haiming Zhu & Chunfeng Zhang & Xian-Kai Chen & Hongzheng, 2024. "On the role of asymmetric molecular geometry in high-performance organic solar cells," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    6. Yuming Wang & Jianwei Yu & Rui Zhang & Jun Yuan & Sandra Hultmark & Catherine E. Johnson & Nathaniel P. Gallop & Bernhard Siegmund & Deping Qian & Huotian Zhang & Yingping Zou & Martijn Kemerink & Art, 2023. "Origins of the open-circuit voltage in ternary organic solar cells and design rules for minimized voltage losses," Nature Energy, Nature, vol. 8(9), pages 978-988, September.
    7. Baobing Fan & Wei Gao & Xuanhao Wu & Xinxin Xia & Yue Wu & Francis R. Lin & Qunping Fan & Xinhui Lu & Wen Jung Li & Wei Ma & Alex K.-Y. Jen, 2022. "Importance of structural hinderance in performance–stability equilibrium of organic photovoltaics," Nature Communications, Nature, vol. 13(1), pages 1-11, December.

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