Colloidal synthesis of lead-free Cs2TiBr6−xIxperovskite nanocrystals

Abstract

Cesium titanium halide perovskites are novel lead-free optoelectronic materials that have attracted attention in the last two years for their application in solar cells with power conversion efficiencies reaching 3.3%. We report here the first colloidal synthesis of pure and mixed bromide-iodide cesium titanium perovskite nanocrystals with a bandgap tunable from 2.3 eV to 1.2 eV.