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

Shengfan Wu, Yichao Yan, Jun Yin, Kui Jiang, Fengzhu Li, Zixin Zeng, Sai-Wing Tsang and Alex K.-Y. Jen ()
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Shengfan Wu: City University of Hong Kong
Yichao Yan: City University of Hong Kong
Jun Yin: The Hong Kong Polytechnic University
Kui Jiang: City University of Hong Kong
Fengzhu Li: 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

Nature Energy, 2024, vol. 9, issue 4, 411-421

Abstract: 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).

Date: 2024
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DOI: 10.1038/s41560-024-01451-8

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