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Redox mediator-stabilized wide-bandgap perovskites for monolithic perovskite-organic tandem solar cells

Author

Listed:
  • Shengfan Wu

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

  • Yichao Yan

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

  • Jun Yin

    (The Hong Kong Polytechnic University)

  • Kui Jiang

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

  • Fengzhu Li

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

  • Zixin Zeng

    (City University of Hong Kong)

  • Sai-Wing Tsang

    (City University of Hong Kong)

  • Alex K.-Y. Jen

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

Abstract

Halide segregation critically limits the stability of mixed-halide perovskite solar cells under device operational conditions. There is a strong indication that halide oxidation is the primary driving force behind halide de-mixing. To alleviate this problem, we develop a series of multifunctional redox mediators based on anthraquinone that selectively reduce iodine and oxidize metallic Pb0, while simultaneously passivating defects through tailored cationic substitution. These effects enable wide-bandgap perovskite solar cells to achieve a power conversion efficiency of 19.58% and a high open-circuit voltage of 1.35 V for 1.81-eV PSCs. The device retains 95% of its initial efficiency after operating at its maximum power point for 500 h. Most notably, by integrating the perovskite device into the monolithic perovskite-organic tandem solar cell as a wide-bandgap subcell, we report an efficiency of 25.22% (certified 24.27%) with impressive long-term operational stability (T90 > 500 h).

Suggested Citation

  • Shengfan Wu & Yichao Yan & Jun Yin & Kui Jiang & Fengzhu Li & Zixin Zeng & Sai-Wing Tsang & Alex K.-Y. Jen, 2024. "Redox mediator-stabilized wide-bandgap perovskites for monolithic perovskite-organic tandem solar cells," Nature Energy, Nature, vol. 9(4), pages 411-421, April.
    • Handle: RePEc:nat:natene:v:9:y:2024:i:4:d:10.1038_s41560-024-01451-8
    DOI: 10.1038/s41560-024-01451-8
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