Decoupling photothermal-mechanical degradation through lattice-stabilizing networks in Sn–Pb perovskites and all-perovskite tandem solar cells

Haibin Pan, Yang Bai, Kexuan Sun, Ming Yang, Ruijia Tian, Yuanyuan Meng, Jiangwei Gao, Yaohua Wang, Jingnan Wang, Shujing Zhou, Zhenhua Song, Lu Xiaoyi, Chang Liu () and Ziyi Ge ()
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Haibin Pan: Chinese Academy of Sciences
Yang Bai: Chinese Academy of Sciences
Kexuan Sun: Chinese Academy of Sciences
Ming Yang: Chinese Academy of Sciences
Ruijia Tian: Chinese Academy of Sciences
Yuanyuan Meng: Chinese Academy of Sciences
Jiangwei Gao: Chinese Academy of Sciences
Yaohua Wang: Chinese Academy of Sciences
Jingnan Wang: Chinese Academy of Sciences
Shujing Zhou: Chinese Academy of Sciences
Zhenhua Song: Chinese Academy of Sciences
Lu Xiaoyi: Chinese Academy of Sciences
Chang Liu: Chinese Academy of Sciences
Ziyi Ge: Chinese Academy of Sciences

Nature Communications, 2025, vol. 16, issue 1, 1-12

Abstract: Abstract All-perovskite tandem solar cells (PTSCs) demonstrate exceptional potential to surpass the Shockley-Queisser (SQ) theoretical limit. However, practical implementation faces critical challenges due to a self-reinforcing photothermal-mechanical degradation mechanism originating from multiscale physical couplings. In this study, a multifunctional polyamine ligand triphenyltriamine thiophosphate (TPTA) was introduced into the tin-lead (Sn-Pb) perovskite solution system to establish an I-Sn-N coordination-mediated lattice stabilization framework, and the photothermal-mechanical coupling path was cut off from multiple aspects such as suppressing periodic oscillations and regulating stress. Consequently, single-junction Sn-Pb perovskite solar cells (PSCs) achieve a power conversion efficiency (PCE) of 23.4% and retaining 94.9% of initial performance after 950 hours of maximum power point (MPP) tracking. When the device is integrated into the 2-terminal (2 T) tandem architecture, its PCE reaches a significant level of 29.6 % (certified PCE of 28.9%), and 93.4% of the initial efficiency can be maintained after 900 hours continuous operation.

Date: 2025
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DOI: 10.1038/s41467-025-64274-5

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