Universal in situ oxide-based ABX3-structured seeds for templating halide perovskite growth in All-perovskite tandems

Weiqing Chen, Shun Zhou, Hongsen Cui, Weiwei Meng, Hongling Guan, Guojun Zeng, Yansong Ge, Sengke Cheng, Zixi Yu, Dexin Pu, Lishuai Huang, Jin Zhou, Guoyi Chen, Guang Li, Hongyi Fang, Zhiqiu Yu, Hai Zhou, Guojia Fang and Weijun Ke ()
Additional contact information
Weiqing Chen: Wuhan University
Shun Zhou: Wuhan University
Hongsen Cui: Wuhan University
Weiwei Meng: South China Normal University
Hongling Guan: Wuhan University
Guojun Zeng: Wuhan University
Yansong Ge: Wuhan University
Sengke Cheng: Wuhan University
Zixi Yu: Wuhan University
Dexin Pu: Wuhan University
Lishuai Huang: Wuhan University
Jin Zhou: Wuhan University
Guoyi Chen: Wuhan University
Guang Li: Wuhan University
Hongyi Fang: Wuhan University
Zhiqiu Yu: Wuhan University
Hai Zhou: Dongguan
Guojia Fang: Wuhan University
Weijun Ke: Wuhan University

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

Abstract: Abstract Precise control over halide perovskite crystallization is pivotal for realizing efficient solar cells. Here, we introduce a strategy utilizing in-situ-formed oxide-based ABX3-structured seeds to regulate perovskite crystallization and growth. Introducing potassium stannate into perovskite precursors triggers a spontaneous reaction with lead iodide, producing potassium iodide and lead stannate. Potassium iodide effectively passivates defects, while PbSnO3 (ABX3-structured), exhibiting a 98% lattice match, acts as a template and seed. This approach facilitates pre-nucleation cluster formation, preferential grain orientation, and the elimination of intermediate-phase processes in perovskite films. Incorporating potassium stannate into both the perovskite precursors and the buried hole transport layers enables single-junction 1.25 eV-bandgap Sn-Pb perovskite solar cells to achieve a steady-state efficiency of 23.12% and enhanced stability. Furthermore, all-perovskite tandem devices yield efficiencies of 28.12% (two-terminal) and 28.81% (four-terminal). This versatile templating method also boosts the performance of 1.77 eV and 1.54 eV-bandgap cells, underscoring its broad applicability.

Date: 2025
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DOI: 10.1038/s41467-025-57195-w

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