One-stone-for-two-birds strategy to attain beyond 25% perovskite solar cells

Perovskite solar cells, while exhibiting high power conversion efficiency, face challenges in long-term stability, large-area fabrication, and module efficiency. This study introduces a novel strategy using a single amidino-based ligand (3-amidinopyridine) to simultaneously achieve anion-fixation and undercoordinated-Pb passivation during crystallization. This approach resulted in devices with a power conversion efficiency of 25.3% (certified at 24.8%), and significantly improved stability, retaining 92% of initial efficiency after 5000 hours in ambient conditions (unencapsulated) and 95% after >500 hours under continuous light irradiation (encapsulated). This simple strategy holds promise for large-area fabrication.

Tinghuan Yang, Lili Gao, Jing Lu, Chuang Ma, Yachao Du, Peijun Wang, Zicheng Ding, Shiqiang Wang, Peng Xu, Dongle Liu, Haojin Li, Xiaoming Chang, Junjie Fang, Wenming Tian, Yingguo Yang, Shengzhong (Frank) Liu, Kui Zhao