Abstract
Zinc oxide (ZnO) thin films were prepared through thermal oxidation of metallic zinc samples under various oxygen partial pressures at 330 and 380 °C. The surface morphologies of the oxide films formed were characterised with high-resolution scanning electron microscopy (HR-SEM). These oxide films consist of nano-sized whisker and cluster-like grains. The photoluminescence (PL) properties of ZnO films were also analysed. Near-band edge ultra-violet (UV) emission was observed, as well as green emission. It was found that the UV to green emission ratio had clear relation with the oxygen partial pressure during oxidation.
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