Authors: A. U. UBALE, A. R. JUNGHARE, N. A. WADIBHASME, A. S. DARYAPURKAR, R. B. MANKAR, V. S. SANGAWAR
Abstract: Nanostructured thin films have attracted the attention of an increasing number of researchers from several disciplines during the last ten years, due to their outstanding electronic and optical properties and extensively useful applications in various optoelectronic devices. PbS thin films were deposited onto glass substrate by the method of chemical bath deposition (CBD) at 330 K temperature. The structure and surface morphology of the films were characterized by X-ray diffraction and scanning electron microscopy. The optical investigation showed that, depending on thickness films have direct allowed transitions in the range 1.88-2.28 eV. The decrease in dc dark resistivity with increase in grain size was also studied. The thermo-emf measurements show that deposited films were p-type in nature.
Keywords: Thin film, PbS, CBD method, electrical and optical properties
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