Lian Xinxin, Jin Mingjing, Dai Weideren, Lv Yuanjiang, Luo Ming, Hu Ying, Wang Zhijie, Li Haiyun, Xu Chunyu, Jiang Dongrui, Min Hao, Chen Yifan, Chang Jin, Su Tzu-Sen, Ma Fei, Bai Yang, Zhang Hong, Mo Xiaoliang, Chu Junhao
State Key Laboratory of Photovoltaic Science and Technology, Institute of Optoelectronics, College of Future Information Technology, Fudan University, Shanghai, China.
Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception, Fudan University, Shanghai, China.
Nat Commun. 2025 Aug 4;16(1):7173. doi: 10.1038/s41467-025-62391-9.
Wide-bandgap perovskite is pivotal as a photoactive layer in the top cell of prevailing tandem solar cells. However, the intrinsic instability of wide-bandgap perovskite solar cells is predominantly attributed to the vacancy defects caused by multiple ion migration. Here, we incorporate an ether ring super-molecule into perovskite. This supramolecular approach effectively manipulates the crystallization kinetics and suppresses the halide segregation under illumination by tuning the coordination of halides toward monovalent cations and lead ions. As a result, the supramolecular engineered 1.77 eV perovskite solar cells achieve a champion power conversion efficiency of 21.01% with an outstanding operational stability, retaining 95% of initial efficiency after 1000 h σof maximum-power-point tracking test. Meanwhile, the two-terminal all-perovskite tandem solar cells achieve the champion efficiency of 28.44% (certified 27.92%). This work paves an avenue to improve the film quality and illumination stability of mixed halide wide-bandgap perovskites with a supramolecular approach.
宽带隙钙钛矿作为主流串联太阳能电池顶部电池的光活性层至关重要。然而，宽带隙钙钛矿太阳能电池的固有不稳定性主要归因于多种离子迁移导致的空位缺陷。在此，我们将醚环超分子引入钙钛矿中。这种超分子方法通过调节卤化物与单价阳离子和铅离子的配位，有效地控制了结晶动力学并抑制了光照下的卤化物偏析。结果，超分子工程化的1.77 eV钙钛矿太阳能电池实现了21.01%的最佳功率转换效率，并具有出色的运行稳定性，在最大功率点跟踪测试1000小时后仍保持初始效率的95%。同时，两端全钙钛矿串联太阳能电池实现了28.44%的最佳效率（认证效率为27.92%）。这项工作为通过超分子方法提高混合卤化物宽带隙钙钛矿的薄膜质量和光照稳定性开辟了一条途径。
