Heterojunction formed via 3D-to-2D perovskite conversion for photostable wide-bandgap perovskite solar cells

Jin Wen, Yicheng Zhao, Pu Wu, Yuxuan Liu, Xuntian Zheng, Renxing Lin, Sushu Wan, Ke Li, Haowen Luo, Yuxi Tian, Ludong Li and Hairen Tan ()
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Jin Wen: Nanjing University
Yicheng Zhao: University of Electronic Science and Technology of China
Pu Wu: Nanjing University
Yuxuan Liu: Nanjing University
Xuntian Zheng: Nanjing University
Renxing Lin: Nanjing University
Sushu Wan: Nanjing University
Ke Li: Nanjing University
Haowen Luo: Nanjing University
Yuxi Tian: Nanjing University
Ludong Li: Nanjing University
Hairen Tan: Nanjing University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Light-induced halide segregation constrains the photovoltaic performance and stability of wide-bandgap perovskite solar cells and tandem cells. The implementation of an intermixed two-dimensional/three-dimensional heterostructure via solution post-treatment is a typical strategy to improve the efficiency and stability of perovskite solar cells. However, owing to the composition-dependent sensitivity of surface reconstruction, the conventional solution post-treatment is suboptimal for methylammonium-free and cesium/bromide-enriched wide-bandgap PSCs. To address this, we develop a generic three-dimensional to two-dimensional perovskite conversion approach to realize a preferential growth of wider dimensionality (n ≥ 2) atop wide-bandgap perovskite layers (1.78 eV). This technique involves depositing a well-defined MAPbI3 thin layer through a vapor-assisted two-step process, followed by its conversion into a two-dimensional structure. Such a two-dimensional/three-dimensional heterostructure enables suppressed light-induced halide segregation, reduced non-radiative interfacial recombination, and facilitated charge extraction. The wide-bandgap perovskite solar cells demonstrate a champion power conversion efficiency of 19.6% and an open-circuit voltage of 1.32 V. By integrating with the thermal-stable FAPb0.5Sn0.5I3 narrow-bandgap perovskites, our all-perovskite tandem solar cells exhibit a stabilized PCE of 28.1% and retain 90% of the initial performance after 855 hours of continuous 1-sun illumination.

Date: 2023
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DOI: 10.1038/s41467-023-43016-5

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