Flexible perovskite/silicon monolithic tandem solar cells approaching 30% efficiency

Yinqing Sun, Faming Li, Hao Zhang, Wenzhu Liu, Zenghui Wang, Lin Mao, Qian Li, Youlin He, Tian Yang, Xianggang Sun, Yicheng Qian, Yinyi Ma, Liping Zhang, Junlin Du, Jianhua Shi, Guangyuan Wang, Anjun Han, Na Wang, Fanying Meng, Zhengxin Liu () and Mingzhen Liu ()
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Yinqing Sun: University of Electronic Science and Technology of China
Faming Li: University of Electronic Science and Technology of China
Hao Zhang: University of Electronic Science and Technology of China
Wenzhu Liu: Chinese Academy of Sciences
Zenghui Wang: University of Electronic Science and Technology of China
Lin Mao: University of Electronic Science and Technology of China
Qian Li: University of Electronic Science and Technology of China
Youlin He: University of Electronic Science and Technology of China
Tian Yang: University of Electronic Science and Technology of China
Xianggang Sun: University of Electronic Science and Technology of China
Yicheng Qian: University of Electronic Science and Technology of China
Yinyi Ma: University of Electronic Science and Technology of China
Liping Zhang: Chinese Academy of Sciences
Junlin Du: Chinese Academy of Sciences
Jianhua Shi: Chinese Academy of Sciences
Guangyuan Wang: Chinese Academy of Sciences
Anjun Han: Chinese Academy of Sciences
Na Wang: Chinese Academy of Sciences
Fanying Meng: Chinese Academy of Sciences
Zhengxin Liu: Chinese Academy of Sciences
Mingzhen Liu: University of Electronic Science and Technology of China

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract Thanks to their excellent properties of low cost, lightweight, portability, and conformity, flexible perovskite-based tandem solar cells show great potentials for energy harvesting applications, with flexible perovskite/c-silicon tandem solar cells particularly promising for achieving high efficiency. However, performance of flexible perovskite/c-silicon monolithic tandem solar cells still greatly lags, due to challenges in simultaneously achieving both efficient photocarrier transport and reliable mitigation of residual stress. Here, we reveal the critical role of perovskite phase homogeneity, for achieving highly-efficient and mechanical-stable flexible perovskite/c-silicon heterojunction monolithic tandem solar cells (PSTs) with textured surface. Through ensuring high phase homogeneity, which promotes charge transfer across all facets of the pyramid on the textured substrates and releases the residual stress at the perovskite/c-silicon interface, we demonstrate flexible PSTs with a bending curvature of 0.44 cm-1, and a certified power conversion efficiency of 29.88% (steady-state 29.2%, 1.04 cm2 aperture area), surpassing all other types of flexible perovskite-based photovoltaic devices. Our results can lead to broad applications and commercialization of flexible perovskite/c-silicon tandem photovoltaics.

Date: 2025
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DOI: 10.1038/s41467-025-61081-w

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