Solid-solution-induced lattice hardening reinforces perovskite stiffness for stable solar cell

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ID: 326374
2026
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Abstract
Abstract The operational instability of perovskite photovoltaics is mainly attributed to the soft, ionic nature of its lattice. However, the quantification and intrinsic tuning strategy of perovskite lattice stiffness, and its correlation with device performance and stability has not been well explored. Here, we propose a solid-solution-induced lattice hardening (SSILH) strategy to enhance the stiffness of perovskite through partial substitution of lead ions with lanthanum ions. The reinforcement mechanism stems from the beneficial lattice contraction and bond-strengthening induced by lanthanum dopant with smaller ionic radius and stronger chemical interaction, which collectively yield a denser and more rigid framework. Consequently, the strategy obviously enhances the perovskite stiffness with Young’s modulus increasing from 27.96 to 35.71 GPa. The enhanced lattice stiffness reduces the thermal expansion coefficient, suppresses defect formation and ion migration, thereby mitigating non-radiative recombination and structural degradation under external stress. By employing 4-Isopropyl-4’-methyldiphenyliodonium tetrakis(pentafluorophenyl) borate as a stable p-dopant for the hole transport layer, the resulting device achieves a champion power conversion efficiency (PCE) of 26.54% and a certified steady-state efficiency of 26.03%. The optimized devices retain >95% and >90% of their initial efficiencies after 1000 hours of continuous 1-sun illumination at 65°C and under damp-heat conditions, respectively.
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Authors Jiahao Liang, Hailin Li, Tian Chen, Shengcai Zhu, Hepeng Wang, Zhouti Wang, Yuecheng Hu, Huahui Chen, Wenchang Huo, Ming Fang, Wenjun Liu, Hao Lin, Jiancan Yu, Jiangsheng Xie, Pingqi Gao
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Journal national science review
Year 2026
DOI
10.1093/nsr/nwag484
URL
https://doi.org/10.1093/nsr/nwag484
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