Room‐Temperature Solvent Evaporation Induced Crystallization: A General Strategy for Growth of Halide Perovskite Single Crystals by Applying the Le Chatelier's Principle
Lei Gao, Xiuting Luo, Jia‐Lin Sun, Qiang Li, Qingfeng Yan
Abstract
Abstract The growth of high‐quality halide perovskite single crystals is imperative to study their intrinsic physical properties and to realize high‐performance optoelectronic devices. Here, a room‐temperature solvent evaporation‐induced crystallization (RTSEIC) method is reported based on Le Chatelier's principle, which provides a general strategy to grow halide perovskite single crystals including 3D, 2D, 1D, and 0D, and either hybrid or all‐inorganic halide perovskites. Taking 2D n ‐BA 2 PbBr 4 ( n ‐BA = butylammonium) as an example, the room‐temperature crystallization kinetics is demonstrated. The centimeter‐sized n ‐BA 2 PbBr 4 single crystals exhibit an extremely small full width at half maximum (FWHM) of 0.024° in (0 0 2) plane rocking curve and a small trap density of 2.74 × 10 10 cm −3 . The superior crystalline quality endows the n ‐BA 2 PbBr 4 single crystal ultraviolet photodetectors with recorded performance among reported n ‐BA 2 PbBr 4 ultraviolet photodetectors, demonstrating a detectivity reaching 1.8 × 10 13 Jones, a fast response time of 55 µs and a high on‐off ratio of 10 4 . The low‐cost, simple, general, and efficient RTSEIC method is anticipated to promote the blossoming of halide perovskites single crystals.