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Effect of substrate temperature on the structural and electrical properties of spray deposited lead sulfide thin films
(Elsevier Ltd, 2016) Veena, E.; Bangera, K.V.; Shivakumar, G.K.
Lead sulfide (PbS) thin films were prepared by chemical spray pyrolysis method using lead acetate and thiourea as precursors of Pb+2 and S-2 ions. X-ray diffraction (XRD) technique, scanning electron microscope (SEM) and EDAX analysis were used for structural, morphological and compositional characterization. XRD analysis shows that the films are cubic in nature with a preferred orientation along (2 0 0). EDAX analysis shows that films deposited at 150Â°C are sulfur rich. An increase in the substrate temperature results in a decrease in the sulfur content of the prepared film. It has been observed that thin films deposited at or above 225Â°C are smooth & uniform morphologically. Beyond a substrate temperature of 275Â°C, the films become discontinuous and non-uniform. However, the films are sulfur rich, even at 275Â°C. Electrical conductivity of prepared thin films have been measured using silver contacts in coplanar geometry. Films are n - type as confirmed by hot probe technique. The electrical conductivity at room temperature (25Â°C) was in the order of 10-4 Î©-1cm-1 and was found to increase with increase in temperature showing the semiconducting nature of the films with the band gap of 0.39 eV. Â© 2016 Elsevier Ltd.