南开大学刘永胜最新AM：26.16%！通过原位产生的2D钙钛矿相实现无MA钙钛矿的受控成核和定向结晶

Enhancing stability while maintaining high efficiency is one of the primary challenges in the commercialization of perovskite solar cells. In light of this, on June 21, 2024, Liu Yongsheng, Nankai University A research achievement on the controlled nucleation and oriented crystallization of MA-free perovskites via an in-situ-generated 2D perovskite phase has been published in AM. A crystal-growth technique assisted by the in-situ-formed 2D perovskite phase has been developed to fabricate high-quality 2D/3D perovskite films. The in-situ-generated 2D perovskite serves as a template for regulating nucleation and oriented crystal growth in α-FAPBI3-rich films, resulting in superior film quality characterized by a significantly reduced trap density and exceptionally long carrier lifetimes. Under extreme environmental conditions (T = 200°C, RH = 75 ± 5%), the fabricated perovskite films exhibit outstanding stability. The corresponding perovskite solar cells achieve an efficiency of 26.16% (certified at 25.84%) along with excellent operational stability (T93 > 1300 hours at T ≈ 50°C) and remarkable thermal-cycling stability.