Single‐Crystal Perovskite Halide: Crystal Growth to Devices Applications

Over a decade, researchers have depicted remarkable optoelectronic properties of halide‐based organic–inorganic perovskites and demonstrated impressive power conversion efficiency in photovoltaic applications, starting from 3.9% to 26.1%. The optoelectronic properties of halide‐based perovskites are significantly influenced by the crystal form and crystallization process. There are two common forms of halide‐based perovskites: polycrystalline films and single‐crystal. In polycrystalline thin films, multiple grain boundaries lead to ion migration, surface flaws, and instability, making them unsuitable for device applications. In contrast, single‐crystal halide‐based perovskites are stable and exhibit exceptional features like long carrier diffusion lengths and low trap density. Although research on polycrystalline halide‐based perovskite thin films is currently intense, investigations on single crystals are still in their early stages. This review article discusses single‐crystal perovskite halide growth methods and their use in optoelectronic devices, as crystal growth affects solar cells, light‐emitting diodes, lasers, photodetectors, and other devices.