Abstract

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Zinc sulphide (ZnS) thin films were deposited from inorganic reagents (solution electrolytes) using a two electrodes electrochemical cell. The film’s thickness and particle distribution were determined by Surface profiler. The film’s particles are continuous but not uniformly distributed across the substrate and the thickness was determined to be 70 nm. X-ray diffraction (XRD) study indicated that the film possesses Zinc blend cubic structure. Crystal size and inter-planar spacing were estimated as 0.36 nm and 0.29 nm respectively. Optical characterization showed that the film has poor absorbance in the visible light region while transmittance is enhanced as wavelength increases. Energy band gap of 3.49 eV was estimated for the film. I-V characteristic of ITO/ZnS/Ag is linear indicating possibility of an ohmic contact between ITO substrate and ZnS film and also between ZnS and Ag. Thus, this study demonstrates that ZnS thin film can be a good recipe for window layer of tin film solar cells.

Keywords: Electrodeposition, Characterization, Zinc Sulphide, thin films, Photovoltaic