Defect passivation can improve perovskite Solar cell Performance and stability are critical. However, this process will affect the surface work function (SWF) of perovskite, which may lead to energy level mismatch. Previous studies only relied on the electrostatic potential (ESP) analysis of the passivator dipole moment, which may not fully describe the changes of SWF at the passivator perovskite interface. The results show that when the same passivator is applied to n-type and p-type perovskite, the interaction between passivator and defect will lead to different SWF trends. In view of this, on May 28, 2024, Feng Xianping of City University of Hong Kong and Wu Chungui of National Central University of Taiwan Province of China published the research results of defect induced passivator dipole moment change to improve the photovoltaic performance of perovskite at AEL, designed a series of anions to repair iodine vacancy (VI), and realized that the charge transfer from passivator to Pb2+can cause significant dipole moment change at the interface, Thus, the surface work function of n-type perovskite (n-PSK) is enhanced. As a result, the traditional battery achieves the highest power conversion efficiency of 24.69%, and exhibits excellent stability under continuous lighting or environmental conditions.
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