Recent Progress of All‐Bromide Inorganic Perovskite Solar Cells

Inorganic perovskite solar cells (PSCs) have attracted enormous attention during the past 5 years. Many advanced strategies and techniques have been developed for fabricating inorganic PSCs with improved efficiency and stability to realize commercial applications. CsPbBr 3 is one of the representative materials of inorganic perovskites and has demonstrated excellent stability against thermal and high humidity environmental conditions. The power conversion efficiency of CsPbBr 3 ‐based PSCs has increased significantly from 5.95% in 2015 to 10.91%, and the storage stability under moisture (≈80% relative humidity) and heat (≈80 °C) is more than 2000 h. The outstanding performance of CsPbBr 3 PSCs shows great potential in light‐to‐electricity conversion applications. In this review, recent developments of CsPbBr 3 ‐based PSCs including the physico‐chemical as well as optoelectronic properties, processing techniques for fabricating CsPbBr 3 films, derivative phase structures, efficiency, and stability of devices are reviewed and discussed. Finally, the challenges and outlook of CsPbBr 3 PSCs for future research directions are outlined.