Controllable Growth of High‐Quality Inorganic Perovskite Microplate Arrays for Functional Optoelectronics

Abstract Inorganic perovskite single crystals have emerged as promising vapor‐phase processable structures for optoelectronic devices. However, because of material lattice mismatch and uncontrolled nucleation, vapor‐phase methods have been restricted to random distribution of single crystals that are difficult to perform for integrated device arrays. Herein, an effective strategy to control the vapor‐phase growth of high‐quality cesium lead bromide perovskite (CsPbBr₃) microplate arrays with uniform morphology as well as controlled location and size is reported. By introducing perovskite seeds on substrates, intractable lattice mismatches and random nucleation barriers are surpassed, and the epitaxial growth of perovskite crystals is accurately controlled. It is further demonstrated that CsPbBr₃ microplate arrays can be monolithically integrated on substrates for the fabrication of high‐performance lasers and photodetectors. This strategy provides a facile approach to fabricate high‐quality CsPbBr₃ microplates with controllable size and location, which offers new opportunities for the scalable production of integrated optoelectronic devices.