Recent Advances in CsPbX_3 Perovskite Solar Cells: Focus on Crystallization Characteristics and Controlling Strategies

摘要

All-inorganic CsPbX_3 (X = I, Br, Cl or their mixtures) perovskites attract enormousattention in recent years due to their excellent optoelectronic properties,outstanding thermal/light stability, and wide range of applications inelectronic devices. Encouragingly, the reported power conversion efficiencyof CsPbX_3 perovskite solar cells (PSCs) rockets up from 2.9 in 2015 to thepresent 21.0. In order to further promote the performance of CsPbX_3 PSCstoward the Shockley–Queisser efficiency limit, it is important to optimize thequality of perovskite films by crystallization kinetics modulation and defectsuppression. In this review, first, some fundamental information aboutall-inorganic CsPbX_3 perovskites is briefly introduced, including the crystallizationmechanism, growth mode, crystal structure, and phase stability aswell as possible defects and their effects on device performance. Second, therecent exciting progress of the crystallization modulation strategies for highqualityCsPbX_3 films is summarized and discussed in detail. The advantagesof different strategies, including annealing engineering, solvent engineering,precursor engineering, composition engineering, and interface engineering,are highlighted. Finally, methods for improving the efficiency of inorganicPSCs are discussed, and the future development prospects of inorganic PSCsare also outlined.