Investigation on Optical Properties of Silar-Grown Highly Oriented Lead Sulphide (PbS) Thin Films

Abstract

Using lead nitrate, thiourea, as well as sodium hydroxide as chemical precursors, the lead sulphide powder was formed at room temperatures and (PbS), at a given room temperature thin film were deposited on a glass substrate using the (SILAR) method at varying numbers of cycles. The optical studies for powder form and thin films were performed by UV-VI diffuse reflectance spectrophotometer-3600 SHIMADZU and UV-VIS-NIR Spectrophotometry. It was discovered that the PbS powder form as well as thin films produced under ideal deposition circumstances were polycrystalline with a face-centered cubic structure. Optical studies for powder form and thin films were carried out using a UV-VI spectrometer and it revealed the existence of direct bandgap for powder form is 1.69 eV and for thin films values in the ranges of (1.45-2.32) eV.