钙钛矿太阳能电池中阳离子不均匀性的调控策略

In recent years,the research advancements have high-lighted the critical role of the A-site cation in determining the optoelectronic and physicochemical properties of organic-inorganic lead halide perovskites.Mixed-cation perovskites(MCPs)have been extensively used as absorber thin films in perovskite solar cells(PSCs),achieving high power conver-sion efficiencies(PCE)over 26％[1,2].The incorporation of mixed cations has led to a more optimal tolerance factor for the crystal structure,enhancing structural stability and provid-ing additional functionalities to improve the chemical stabil-ity of the absorber thin films.However,mixed-cation per-ovskite absorbers often experience element and phase segre-gation,which can reduce device efficiency and operational lifespan.This segregation is a widespread phenomenon observed across various types of MCPs,whether in 2D or 3D structures.Therefore,understanding the fundamental causes of non-uniformity and phase segregation,as well as effective nanoscale regulatory strategies,is essential for enhancing the performance of PSCs.The development of high-quality MCPs with highly uniform cation distribution and stable phases is critical for addressing the stability challenges in PSCs.