Zinc oxide(ZnO)is a promising candidate for many applications due to its low toxicity,high chemical stability,high transparency in the visible wavelength range and low electric resistance.It is a wide band gap semiconductor material with a direct energy gap of about 3.37 eV.ZnO thin film may enable its effi- Zinc oxide (ZnO) is a promising candidate for many applications due to its low toxicity, high chemical stability, high transparency in the visible wavelength range and low electric resistance. It is a wide band gap semiconductor material with a direct energy gap of about 3.37 eV.ZnO thin film may enable its effi-