Sol - Gel Preparation Of Mg <sub> X </ Sub> Zn <sub> 1-x </ Sub> O Nano-film Structure And Optical Properties Study

Zinc oxide is a II-IV wide band-gap ( Eg=3.37eV ) compound semiconductor with wurtzite crystal structure. Due to the large exciton binding energy of 60meV, which ensures the high efficient excitonic emission at room temperature, it is regarded as one of the most promising materials for fabricating efficient ultraviolet (UV) and blue light emitting devices. Since the first observation of the stimulated ultraviolet emission at room temperature, ZnO has become another hotspot in the region of UV light emitting researching.MgxZn1-xO is a wide band-gap ternary alloy with similar structure to ZnO. When x<0.36, the alloy thin films keep the wurtzite structure. In this paper, the samples of x<0.15 were investigated, and the band gap could be varied from 3.79 eV to 4.47 eV. Thus, we can obtain various ultraviolet emission and absorption with various wavelengths.Sol-Gel method is used to synthesis inorganic compound and organic/inorganic multiphase system. It needs simple experiment facility and lower synthesis temperature and it is easy to dope. In this dissertation, MgxZn/1-xO alloy thin films were fabricated by the sol-gel method. X-ray diffraction (XRD), UV-Vis absorption spectroscopy and photoluminescence spectroscopy (PL) were employed to study the structural and optical properties of MgxZn1-xO alloy thin films.The experimental results show that the films were hexagonal wurtzite structure and the band-gap of MgxZn1-xO alloy thin films gradually increased with increasing Mg content. The quality of MgxZn1-xO alloy thin films can be greatly improved by means of annealing in oxygen ambient.