Epitaxial CsPbBr 3 Perovskite – Cs 3 Cu 2 Br 5 Ternary Metal Halide Nanoheterostructures

作者：Kunnathodi Vighnesh, Md. Samim Hassan, Zhuo Li, Anastasiia V. Sokolova, Arsenii S. Portniagin, Haochen Liu, Xin Zhao, Ye Wu, Xiaoyan Zhong, Andrey L. Rogach · 发表于：Nano Letters · 年份：2025 · DOI：10.1021/acs.nanolett.5c03235 · 被引用次数：5 · 研究领域：Perovskite Materials and Applications、Solid-state spectroscopy and crystallography、Optical properties and cooling technologies in crystalline materials

Designing epitaxial nanoheterostructures of metal halide perovskites with other semiconductor materials offers a way to tune their optical properties and charge carrier dynamics. However, achieving an epitaxial interface between them presents a significant challenge due to the differences in their bonding nature, growth kinetics, and lattice mismatch. We synthesized a colloidal epitaxial nanoheterostructure with a pseudo type-II band alignment comprising CsPbBr 3 perovskite and Cs 3 Cu 2 Br 5 ternary metal halide. A hot-injection synthesis route was developed that offers a common reaction pathway for the formation of both kinds of nanocrystals, facilitating the heteronucleation of Cs 3 Cu 2 Br 5 on CsPbBr 3 nanocubes through shared Cs + and Br – sublattices. The crystallographic planes that align across the interface, having minimum lattice mismatch, establish the epitaxial relationship between the constituting counterparts of the nanoheterostructure. This study presents a method for utilizing the Cs and Br sublattices to create an epitaxial interface, enabling development of various combinations of perovskite-semiconductor nanoheterostructures.