Authors: Xu Xiao, Zhiyuan Dai, Yuyao Yang, Li Yuan, Shuyuan Wan, Yang Yang, Tiankuo He, Zeyu Hu, Xinglin He, Fengyuan Li, Zhe Liu, Ruihao Chen, Hongqiang Wang
Published: 2025-03-11
Source: Full article
AbstractPerovskite films have long been plagued by defects, mainly located at grain boundaries, leading to device degradation, especially the effects of residual PbI2. As effective grain boundary passivators, organic ammonium salts are thus extensively investigated. Here, the study introduces a nitrogen heterocyclic molecule, 1,3‐diphenyl‐benzimidazole iodide (DBI), for the post‐treatment of the perovskite film to construct robust one‐dimensional (1D)/three‐dimensional (3D) perovskite structure. The 1D structure of DBPbI3 formed from the interaction between residual PbI2 and DBI enables the repair of local defects and enhancement of film stability. Concurrently, the double conjugated benzene and imidazole rings synergistically facilitate charge transfer and promote the optimization of energy levels, thereby boosting charge extraction. The corresponding 1D/3D perovskite solar cells (PSCs) yielded a high efficiency of 25.04% with excellent photo/thermal stabilities. The corresponding perovskite solar module exhibited an efficiency of 21.04% with a total area of 36 cm2 with robust long‐term stability.