Imbedded Perovskite Nanocrystals in Metal Halide Microcrystal: Synthesis and Heterostructure

Abstract Lead halide perovskite nanocrystals and other metal halides have received considerable attention due to their unique optoelectronic properties. A combined perovskite nanocrystal‐metal halide heterostructure can achieve desirable properties for enriched applications. However, the construction of such a heterostructure is challenging. In this study, a CsPbBr 3 /Cs 2 ZnBr 4 heterostructured microcrystal with perovskite nanocrystals embedded in a metal halide matrix is successfully synthesized using a facile ultrasound‐assisted post‐processing method. The heterostructure of the perovskite‐metal halide composite materials is fully deciphered through ab initio calculations and multiscale characterizations. The heterostructure‐induced variation in optical properties is elucidated based on micro‐nano spectral and luminescence kinetic behaviors. This study provides new insights into the design of perovskite nanocrystal‐based heterostructured materials, improving the understanding of metal halides and extending their applications.