Tailored Crystallization and Defect Control via Acetamide Derivatives for Efficient Tin Perovskite Solar Cells

), regulates the crystallization of tin perovskites, and produces high-quality tin perovskite films with smooth morphology, compact structure, increased crystallinity, and low defect density. Thereby, the 2A2CA-modified tin PSCs achieve a champion efficiency of 14.98% and maintain 90% after storing for over 2200 h in a nitrogen atmosphere.