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Paper Details

Effect of solution molarity on the structural and opto-electric properties of ZnO thin films deposited by spray pyrolysis

E. U. Masumdar1 and M. A. Barote2*

Journal Title:Journal of Chemical, Biological and physical sciences

The present work deals with the preparation of zinc oxide thin films (ZnO) by the spray pyrolysis method. The starting solution was zinc acetate. Effect of solution molarity on film properties was investigated. All films deposited were characterized by various techniques such as X-ray diffraction for structural characterizations, weight difference density method for thickness measurement, UVVIS transmission spectrophotometer for optical properties and the two probe conductivity measurements for electrical characterization. The X- ray diffraction (XRD) patterns showed that the films deposited are polycrystalline with preferential orientation along (002) plane. The optical study showed that films are highly transparent in the visible region with an average transmission of about ~85%. The optical band gap decreased from 3.25 eV to 3.02 eV, on increase in molar concentration from 0.1 M to 0.75 M. As the solution molarity increases, the electrical conductivity increases, reaches to a maximum value of 3.2210?1 ( -cm)-1, for as-grown films at 0.5 M.