Morphological Changes and Enhancement of Ultraviolet Emission by Subsequent Thermal Treatment of Ga-Doped ZnO Nanostructures

ZnO nanostructures doped with a high concentration of Gallium (Ga) were synthesized on a Si substrate by thermal evaporation.Subsequent heat treatments of selected nanostructures was done at 600 • C, 700 • C, 800 • C and 900 • C. Scanning electron microscope (SEM), X-Ray diraction (XRD) and photoluminance (PL) studies was performed after every heat treatment.Systematic scanning electron microscope (SEM) studies suggest signicant sublimation at 800 • C. XRD results show that crystal quality was improved by annealing and phase separation may occur after high temperatures annealing.Ultraviolet (UV) and visible emission depends strongly on the annealing temperatures and luminescent eciency of UV emission is enhanced signicantly with heat treatment.