Strain-induced rubidium incorporation into wide-bandgap perovskites reduces photovoltage loss

• 成果类型: Article
• 署名作者: Zheng, Likai; Wei, Mingyang; Eickemeyer, Felix T.; Gao, Jing; Huang, Bin; Gunes, Ummugulsum; Schouwink, Pascal; Bi, David Wenhua; Carnevali, Virginia; Mensi, Mounir; Biasoni, Francesco; Zhang, Yuxuan; Agosta, Lorenzo; Slama, Vladislav; Lempesis, Nikolaos; Hope, Michael A.; Zakeeruddin, Shaik M.; Emsley, Lyndon; Rothlisberger, Ursula; Pfeifer, Lukas; Xuan, Yimin; Graetzel, Michael
• 署名单位: Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne; National University of Singapore; Nanjing University of Aeronautics & Astronautics; Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne; Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne; Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne; Polytechnic University of Milan
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-9529
• DOI: 10.1126/science.adt3417
• 发表日期: 2025-04-04
• 页码: 88-95
• 关键词: suppressed phase segregation; solar-cells; gap perovskites; cations

摘要

A-site cation mixing can enhance the photovoltaic performance of a wide-bandgap (WBG) perovskite, but rubidium (Rb) cation mixing generally forms a nonperovskite phase. We report that lattice strain locks Rb ions into the alpha-phase of the lattice of a triple-halide WBG perovskite, preventing phase segregation into a nonperovskite Rb-cesium-rich phase. This process cooperates with chloride accommodation and promotes halide homogenization across the entire film volume. The resulting 1.67-electron volt WBG perovskite exhibits photoluminescence quantum yields exceeding 14% under 1-sun-equivalent irradiation, corresponding to a quasi-Fermi level splitting of similar to 1.34 electron volts. A WBG perovskite solar cell with an open-circuit voltage (V-OC) of 1.30 volts was prepared, corresponding to 93.5% of the radiative V-OC limit and representing the lowest photovoltage loss relative to the theoretical limit observed in WBG perovskites.