Inhibiting defect passivation failure in perovskite for perovskite/Cu(In,Ga)Se2 monolithic tandem solar cells with certified efficiency 27.35%

Fengtao Pei, Shuping Lin, Zhongyang Zhang, Shiju Lin, Xingye Huang, Ming Zhao, Jian Xu, Xinmeng Zhuang, Ying Zhang, Jiahong Tang, Yanrun Chen, Kailin Li, Lan Wang, Guilin Liu, Dongmin Qian, Huifeng Liu, Wentao Zhou, Yihua Chen, Jianpu Wang, Huanping Zhou, Boyan Li, Dalong Zhong, Yan Jiang () and Qi Chen ()
Additional contact information
Fengtao Pei: Beijing Institute of Technology
Shuping Lin: National Institute of Clean and Low Carbon Energy
Zhongyang Zhang: Beijing Institute of Technology
Shiju Lin: Beijing Institute of Technology
Xingye Huang: National Institute of Clean and Low Carbon Energy
Ming Zhao: National Institute of Clean and Low Carbon Energy
Jian Xu: Beijing Institute of Technology
Xinmeng Zhuang: Peking University
Ying Zhang: Beijing Institute of Technology
Jiahong Tang: Beijing Institute of Technology
Yanrun Chen: Peking University
Kailin Li: Peking University
Lan Wang: Jiangnan University
Guilin Liu: Jiangnan University
Dongmin Qian: Nanjing Tech University
Huifeng Liu: Peking University
Wentao Zhou: Peking University
Yihua Chen: Beijing Institute of Technology
Jianpu Wang: Nanjing Tech University
Huanping Zhou: Peking University
Boyan Li: National Institute of Clean and Low Carbon Energy
Dalong Zhong: National Institute of Clean and Low Carbon Energy
Yan Jiang: Beijing Institute of Technology
Qi Chen: Beijing Institute of Technology

Nature Energy, 2025, vol. 10, issue 7, 824-835

Abstract: Abstract Thin-film tandem solar cells with wide-bandgap perovskites and Cu(In,Ga)Se2 hold promise for cost-effective lightweight photovoltaics. However, the power conversion efficiency and stability of perovskite/Cu(In,Ga)Se2 tandem solar cells are not yet comparable to single-junction counterparts due to recombination losses and photothermal-induced degradation in wide-bandgap perovskites. In this study, we show that common strategies for perovskite passivation often fail under combined thermal and illumination stresses due to the passivator desorption. We demonstrate a robust passivator with deliberately designed functional groups that inhibits passivator desorption regardless of perovskite surface termination, enhances resistance to photothermal stresses and substantially suppresses phase segregation. The wide-bandgap perovskite solar cells achieved a champion power conversion efficiency of 23.5% with negligible degradation after 1,000 hours of continuous operation under 1-sun illumination at approximately 50 °C. When integrated into perovskite/Cu(In,Ga)Se2 tandem cells, they achieved the steady state power conversion efficiency of 27.93% (certified 27.35%), with stable operation for over 420 hours at ~38 °C in ambient air.

Date: 2025
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DOI: 10.1038/s41560-025-01761-5

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