Synthesis and Electrical, Optical, Electrochemical Properties of Chemically Deposited PbS Thin Films

Lead Sulphide (PbS) thin film was deposit by chemical bath deposition (CBD) process on the glass substrate at room temperature for various time intervals. The precursors used for this deposition are lead acetate since as a supply of lead ions (Pb2+) and thiourea the same as the supply of sulfide ions (S2-) with 0.1M concentration. The pH of the mixed precursors solution was maintained at 9.5-10 by addition of drop by drop ammonia very slowly. The cause of deposition time for different hours studied. The influence of deposition time on properties of PbS film was investigated. The color of films appears black-gray after taking out of the bath. The thickness of the film is increased with increase in deposition time. The electrical resistance and resistivity were 500MΩ and 18.75 MΩ-cm and band gap measured as a function of temperature using D.C. four probe methods was 0.3742 eV. The Cyclic Voltammetry (CV), Linear Sweep Voltammetry (LSV), Chronoamperometry were studied by using potentiostat.