Mechanochemical Synthesis of Zero-Dimensional Metal Halide Perovskites

In this work, we directly demonstrate solid-state synthesis of zero-dimensional metal halide perovskites by mechanochemical synthesis. Three representative zero-dimensional perovskites,
$\text{Cs}_{4}\text{PbBr}_{6}, \text{Cs}_{2}\text{SnBr}_{6}$
, and
$\text{Cs}_{3}\text{Cu}_{2}{\mathrm{I}_{5}}$
, were synthesized with high purity as confirmed by structural analysis and optical spectroscopy measurements. This work promotes mechanochemical synthesis as a tool for observing and understanding the structure-property relationships of low-dimensional perovskites, in addition to their potential as a facile synthesis method for large-scale synthesis of metal halide perovskites.