Publication

Abstract : Undoped and different molar concentrations of Mg-doped ZnO thin films were deposited on glasssubstrates via . spray pyrolysis process. Doping concentration was varied from 0.002 to 0.01 M in steps of 0.002 M. Structural, morphological, optical, electrical and room temperature gas sensing characteristicsof undoped and Mg-doped ZnO thin films were investigated using X-Ray Diffractometer (XRD), FieldEmission Scanning Electron Microscope (FE-SEM), UV e Vis Spectrophotometer and an electrometerrespectively. Structural analysis revealed that all the films were polycrystalline in nature with hexagonalwurtzite crystal structure. Spherical shaped uniformly distributed grains were observed for all the filmswith slight change in size. The optical absorption edge shifted towards the lower wavelength with anincrease in Mg-dopant concentration confirmed the blue-shift. Films with lower Mg-dopant concen-tration showed maximum response towards ammonia at room temperature with quick response andrecovery times.