Study of the Influence of Pb Substitution by Zn²⁺ Ions on the Properties of CsPbBr₃₋ₓIₓ Thin Films

In this work is reported results of a study on optical and structural properties of thin films of cesium lead bromide iodide mixed perovskite (CsPbBr₃₋ₓIₓ), synthesized by sequential evaporation of precursors (CsBr, PbBr₂, PbI₂). Thin films of CsPbBr₃₋ₓIₓ with a high degree of reproducibility of both the molar composition and the photovoltaic properties were achieved, using an electronic system with facilities to control the growth of the samples with the help of PID and PWM algorithms. Special emphasis was put in evaluating the effect that the substitution of the Pb cation by Zn²⁺ ions onto its optical, morphological and structural properties through transmittance, photoluminescence, Scanning Electron Microscopy (SEM) and Urbach Energy measurements.