Solution triggered facile ion-exchange and phase transformation of ternary cesium-copper halide pseudo-perovskites†

Abstract

Ternary cesium-copper halide pseudo-perovskites are an emerging class of semiconductors in the field of optoelectronics. Similarly to metal-halide perovskites, by controlling the halide-composition, their emission properties can be fine-tuned. Here, a post-synthetic halide exchange method was employed to alter the halide-composition and thus the emission properties of polycrystalline Cs₃Cu₂Br₅ layers.