In this work, we studied with a Matlab program, some of optical properties of zinc oxide (ZnO) deposited on glass (SiO2). The parameters studied include the refraction index, extinction coefficient, optical band gap, and complex dielectric constant versus incident photon energy, and transmittance, absorbance and reflectance spectrum of ZnO thin film deposited on glass (SiO2) for different thickness. The films were found to exhibit high transmittance (75-95%), low absorbance and low reflectance in the visible / near infrared region up to 1000 nm. However, the absorbance of the films was found to be high in the ultra violet region with peak around 380 nm.

ZnO is an important II-VI semiconductor material for devices with possible applications such as piezoelectric transducers, gas sensors, transparent electronic in solar cell, saw devices. Based on known research, ZnO is the most promising in optoelectronic and optical applications, especially in UV region. An understanding of the optical properties of ZnO thin film on different substrates is also needed to obtain the optimal configuration for the best performance. In this work, we start our simulation by made a Matlab code to study the Sellmeier equation. The behavior of light transmission of ZnO/BK7 glass and ZnO/Sapphire is studied. Both the variation of thickness of ZnO film and different parameters of Sellmeier model are studied. This approach helps us to determine the best configuration (thin film / substrate) to made advices for optoelectronic applications.

In this work studied the optical properties of ZnO thin films prepared by sol gel spin coating process. A sol has been prepared by reacting Zinc acetate dihydrate and ethylene glycol and dissolving the resultant transparent brittle solid in dry n-propanol. Our thin films with different thickness were prepared by sol-gel method on glass substrates. Optical properties of these films were studied by UV-visible spectrophotometer at 200-800 nm wavelength. The extinction coefficient and band gap were calculated from the transmission spectrum. The analyses show that with the increase of film thickness, both the ultraviolet emission intensity is improved. However, the transmittance in the visible range is hardly influenced by the film thickness, and the averages are all above 80%.