Abstract

Lead iodide (PbI2) thin films were successfully prepared by the thermal evaporation method on a glass substrate at room temperature. The optical properties were investigated as a function of film thickness. The optical absorption data indicate an allowed direct transmission with optical energy gap varies continuously from (2.35–2.40 eV) .The absorption coefficient and band gap energy were determined at room temperature by UV–vis spectrum The low fluctuation in energy gap indicates that the grain size is quite small. This is finding in agreement with AFM results.