Interfacial ferroelectricity unlocks stable formamidinium-based perovskites

Yong Wang (), Wenbin Han, Xingtao Wang, Biao Li, Yehui Wen, Tianchi Zhang, Miao Kan, Dongming Zhao, Yu Wang, Weihua Ning, Xuegong Yu () and Deren Yang ()
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Yong Wang: Zhejiang University
Wenbin Han: Zhejiang University
Xingtao Wang: Huaneng Clean Energy Research Institute
Biao Li: Zhejiang University
Yehui Wen: Zhejiang University
Tianchi Zhang: Zhejiang University
Miao Kan: East China University of Science and Technology
Dongming Zhao: Huaneng Clean Energy Research Institute
Yu Wang: Linköping University
Weihua Ning: Soochow University
Xuegong Yu: Zhejiang University
Deren Yang: Zhejiang University

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

Abstract: Abstract Pure iodide formamidinium (FA) based-perovskite has emerged as highly promising candidates for perovskite photovoltaics, but it remains challenging to achieve long-term phase-stabilized FA-based perovskites. Herein, we present a physics-driven strategy of interfacial ferroelectricity, achieved by the integration of ferroelectric CsMnBr3 nanocrystals (NCs) into FA-based perovskites. The ferroelectric field generated by these NCs promotes FA+ cation ordering, modulates Pb–I framework, and enhances the structural regulation of the perovskite lattice. This synergistically increases the kinetic barrier for the undesired Pb-I octahedral transformation and raises the energy barrier for ion migration. The resulting perovskite materials exhibit high structure stability, enabling perovskite solar cell (PSC) minimodule to retain 99% of its initial efficiency after 1000 hours’ stability testing under 85% relative humidity at 85 °C. Owing to the improvement at the interface, the PSCs yield an efficiency of 26.62% (certified 26.40%), and the minimodules reach 24.67% (certified 23.23%). This work presents an effective approach to achieving high-performance, long-term stable perovskite optoelectronic devices through interfacial ferroelectric engineering.

Date: 2025
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DOI: 10.1038/s41467-025-64545-1

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