On constructing a dielectric function for cesium lead halide perovskites

The potential applications of cesium lead halide perovskites are widespread and are based on their unique dielectric response properties. It follows that for modeling the dielectric response of these materials, construction of a dielectric response function that is formulated for quantitative representation of underlying physical processes is required for the simulation of their performance as detectors, emitters or photocathodes. The present study examines physical characteristics of the dielectric response of cesium lead halide perovskites that provide a foundation for formulating quantitative dielectric response functions.