Preparation of the ZnO Thin Films by Sol-Gel Method

The ZnO thin films are prepared on glass sheets by sol-gel technology, which are characterized by X-ray diffraction, atomic force microscopy and ultra-violet spectrum. The results indicate that the thin films are c-orientation, highly visible transmittance, homogeneous and dense surface with the crystalline structure of hexagonal wurtizite, the crystalline dimension of 40～90 nm. The crystal size increases with the increasing sol concentration, and the films are highly oriented in (002) direction as the growing of the film layers. The transmittance has a sharp fundamental absorption edge in UV region, the optical band gap is evaluate to be around 3.34 eV.