Nanocrystallization of lead‐free Cs ₃ Sb ₂ Br ₉ perovskites in chalcogenide glass

Abstract

Abstract Lead‐free halide perovskite nanocrystals (HPNCs) are an emergent alternative of lead‐based halide perovskites owing to their environmentally benign nature. In this work, lead‐free Cs 3 Sb 2 Br 9 HPNCs were precipitated firstly in chalcogenide glass through an elaborated composition design and appropriate crystallization process. The microstructural evolution and nanocrystallization behavior of the Cs 3 Sb 2 Br 9 crystallized glass‐ceramics were analyzed by employing advanced characterization techniques. It is revealed that the crystallization process is temperature‐dependent and can be described as two stages. At the first crystallization stage, the nucleation and crystal growth of Cs 3 Sb 2 Br 9 HPNCs occur due to the presence of structural similarity of [Sb 2 Br 9 ] 3− dioctahedral clusters in the precursor glass. And then the second crystalline phase of GeS 2 is successively separated from the residual glassy matrix under high‐temperature treatment. This work should be of great guiding significance for developing novel glass‐ceramic materials embedded with lead‐free HPNCs.