الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 173 |  |  |
| | | from | 173 | | |
Abstract
The present study employs vacuum evaporation with a view to depositing thin films of IIVI Semiconductor materials. The materials deposited include CdTe, ZnTe, ZnSe, ZnSeTe, and CdZnTe. The deposited films are annealed at different temperatures (100 oC, 150 oC) for different time periods (1. 2, and 5 hours). The optical properties are calculated for each sample. Spectroscopic measurements the absorbance and the transmittance with wavelength are measured for the samples by UV spectroscope in wavelength range 400-1000 nm for determining the optical properties of the samples such as electronic band gap energy, the refractive index, the dielectric constant, and the film thickness.
The results obtained by this study reveal that photovoltaic solar power is one of the most promising renewable energy sources in the world compared to other renewable energy sources. Interesting still, Egypt enjoys a remarkably abundant solar radiation almost allyear around, with very few cloudy days per year. Equally interesting, Egypt enjoys a total annual 2400-4000 hours of sunshine per year and receives a total annual direct solar radiation between 1,970 3,200 kWh/m2. The urbanization of areas remote from the Nile valley, the national electrical power grid and the establishment of new communities in Toushka, Uwainat, the Oases, the Western desert, the Eastern desert, the Red Sea coast, the North and South of Sinai, as well as the northwestern Mediterranean Sea coast gives an economic edge to the use of photovoltaics as a source of electrical energy. The economic advantage credited the photovoltaics sheds light on the high costs of the electrical power cables, towers, lines, and generation facilities required by the traditional fuels; photovoltaics are therefore economical while other traditional fuels are a hindrance, based on economic backgrounds. The annealing conditions have an effect on the sample properties. When the temperature and time of annealing increase, the strong and medium absorption regions increase in two heterojunctions. Baed on this tremendously important result, the optical properties will differ from one sample to another.