钙钛矿电池光暗交替环境下光电转化效率提高

Core Insights - A research team led by Huang Wei and Qin Tianshi from Sun Yat-sen University has made significant advancements in perovskite solar cells, addressing key failure mechanisms during real-world day-night cycling operations and developing a lithium-free doping technology that enhances the commercialization potential of these cells [1][2]. Group 1: Research Findings - The performance of perovskite solar cells has seen remarkable improvements, with energy conversion efficiency surpassing 26% [1]. - A major challenge for commercialization is the long-term stability of these cells, particularly their durability in real outdoor environments, as existing tests often do not simulate actual day-night cycles [1]. - The research team discovered that lithium ions migrate from the hole transport layer to the perovskite layer during light-dark cycling, leading to a phase transition that causes rapid performance degradation [1]. Group 2: Innovative Solutions - The team introduced a novel lithium-free dopant, methylammonium bis(trifluoromethanesulfonyl)imide (MATFSI), which replaces the traditional lithium salt LiTFSI in the hole transport layer [2]. - Devices using MATFSI achieved a power conversion efficiency of 26.1% (certified efficiency of 25.6%), with significantly improved hole mobility and enhanced charge extraction capabilities [2]. - This innovation demonstrates substantial advantages in simulated real-world light-dark cycling and voltage switching, marking a breakthrough in stability for practical applications [2]. Group 3: Future Directions - The research has been jointly completed by teams from Nanjing Tech University and Sun Yat-sen University and has received patent protection [2]. - The next steps involve advancing the technology towards practical applications [2].