Proceedings of MATSUS Fall 2026 Conference (MATSUSFall26)
Publication date: 22nd July 2026
Tin perovskite has emerged as a leading lead-free perovskite solar cell material, yet its performance is hindered by high defect density due to facile oxidation. In this work, we develop a high-entropy tin perovskite by incorporating five distinct organic A-site cations. The increased entropy benefits the decrease of reaction enthalpy change (ΔH), effectively suppressing oxidation. Solar cells based on this wide-bandgap high-entropy tin perovskite achieve a power conversion efficiency (PCE) of 8.45%, which is 15% higher than a conventional low-entropy structure. Furthermore, the enhanced stability of the perovskite film enables atomic layer deposition of SnO x on the top as an electron transport layer under humid conditions. It allows the fabrication of efficient semi-transparent wide- bandgap tin perovskite solar cells showing a PCE of 8.2%. Leveraging this efficient half-transparent device, we demonstrate the first successful fabrication of a tin perovskite/silicon tandem solar cell showing a PCE of 16.2%.
This work was supported by the National Key Research and Development Program of China (2024YFE0107200, 2021YFA0715502), the National Natural Science Foundation of China (22175118, U24A20510), the Science and Technology Commission of Shanghai Municipality (24DZ3001000), and the Young Scientists Fund-Type C of the National Natural Science Foundation of China (12404263). The authors acknowledge Dr. Rong Gao, Dr. Na Yu, Dr. Hua Liu, Dr. Peihong Cheng, and Dr. Xinyan Wang for their kind assistance. The authors acknowledge the Centre for High-resolution Electron Microscopy (ChEM), SPST, ShanghaiTech University for the support.
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