Fabrication and Optical Tuning of PbS Thin Films Using SILAR Method: Towards Next-Generation Photonic and Infrared Devices"

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.