Single-crystal halide perovskites: Opportunities and challenges

Summary Single-crystal halide perovskites have demonstrated excellent optoelectronic properties and promising device application potentials, thanks to their remarkable carrier dynamics, solution processing procedures, and outstanding stabilities. The latest progress and future perspectives of single-crystal halide perovskites are reviewed herein. The basic properties and fundamental studies of single-crystal halide perovskites are first discussed. We then introduce the growth methods for these materials and summarize their recent developments. We further present the single-crystal halide perovskite devices among their major application fields. Finally, we discuss current challenges and provide some suggestions for their further development. We hope this paper can help readers understand the status and future challenges for single-crystal halide perovskites.