علوم - دكتوراة
Permanent URI for this collectionhttps://repository.neelain.edu.sd/handle/123456789/511
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Item Optical Properties of Zinc Oxide Thin Films(Al Neelain University, 2008) Hashim Mohammed Mosleh Alsana .The aim of this study to investigate the influence of annealing of temperatures and the effect of laser radiation on the optical transmittance and absorbance of ZnO thin films. In this study evaporation, casting and coating methods were used for preparation and deposition of ZnO on glass substrate . The materials ZnCL 2 , NaOH and NH 3 as completing agents were used for preparation of ZnO thin films at room temperature. The weighting and micro office picture manager methods are used for thickness measured. The UV spectrophotometer in range 190 nm are to 1100 nm to investigate samples ZnO thin film before and after treatment. The transmittance of ZnO thin films samples is found before annealing to approximately between zero and 2.34 % at 296 nm≤ λ≤ 302 nm at throughout UV – VIS regions . Also the film show that the optical absorbance high in UV region then decay exponentially with increasing the wavelength . After annealing temperature, it was noticed that the optical transmittance increased linearly with increasing temperature . The film high transmittance value 69% in wavelength 400 nm at 550 ̊C with lower thickness (0.009 μm) . And the film is lower transmittance value approximately 0% in wavelength 301 nm at lower temperature 450 ̊C. Also the film show increase of the optical absorbance with decrease of temperature where the beak value in UV region at wavelength 301nm at 450 ̊C with higher thickness , then decreasing with increasing wavelength to reach lower value approximately at wavelength 316nm at higher temperature 550 ̊C . Other samples at constant temperatures in 500 ̊C show the film high transmittance approximately (1.97%) in UV region at wavelength 292 nm at 500 ̊C, and the film show peak absorbance in UV region at wavelength 301 nm then decreasing with 2 increasing wavelength throughout UV-VIS-NIR regions at 500 ̊C . Finally some samples annealed with laser radiation at 20 minutes . These samples show the increasing of transmittance and decreasing of absorbance after annealing with laser radiation throughout UV-VIS- NIR regions . Also we notice increasing of transmittance and decreasing of absorbance with laser radiation at 20 minutes exposured