Defects Passivation Strategy for Efficient and Stable Perovskite Solar Cells

Abstract Large area, high efficiency, and long‐term device stability are integral performance requirements for the commercialization of perovskite solar cells (PSCs). However, the high defect states density formed during the process of device preparation plays a cardinal effect in the charge recombination and ion migration process. The existence of defect states will not only seriously impair the stability but also hinder the efficiency enhancement of PSCs. A large number of studies aiming to solve this problem show that the defects can be reduced to enhance the photovoltaic performance and stability of derived PSCs by tailoring the terminal groups on the perovskite surface and modifying the surface chemical environment. Herein, a systematic and comprehensive review on the development of interfaces passivation (including the anode buffer layer, electron transport layer, the perovskite grains, and hole transport layer) for PSCs is summarized. Based on the defect passivation engineering, various feasible strategies are proposed to break the bottleneck of the commercialization process PSCs.