Abstract:

     The doping of sulfur can introduce Zn vacancies into ZnO material, which will enhance visible emission. We prepared Sdoped ZnO wurtzite structures with hydrothermal method. The size of ZnO crystals increases from 1.2 μm to 2.3 μm with the increase of resultant temperature. Crystal growth of ZnO changes from uniform growth at lower temperature to preferential growth of some crystals at higher temperature. Ultraviolet and visible emissions are all enhanced, but the enhancement of visible emission is significantly greater than that of ultraviolet emission. This demonstrates that the increase of growth temperature will improve the quality of crystals. The existence of sulfur will soon increase Zn vacancies. The result shows a potential application of ZnO material in a visible emission device.

Key words: ZnO, hydrothermal method, growth mechanism, optical property