Study of some photic properties of thin membranes of zinc oxide, which is affected by different percentages of aluminum

Abstract

The Objectives of this research to prepare Al doped ZnO  at ( 10% -20% - 30% - 40 % ) thin films have been prepared  by  (sol – gel) Technique And the study of some of its optical properties such as absorption , absorption coefficient , Extinction Coefficient and permeability by recording the absorption spectra of UV and visible spectroscopy And processed with Orginal 8.6 program. The study was conducted within the range of wavelengths (300 - 900) nm. Both absorbability, absorption coefficient, Extinction Coefficient and permeability spectrum were studied as a function of wavelength, the absorption values were reduced by increasing the wavelength ratios within the wavelength range of (550-400) nm. The absorbance values were a 0.338 AU for the sample with 10% of the Rates of aluminum doping, Then the absorption values decreased and the lowest value was obtained at 40% aluminum Doped and reached 0.019 AU. It was found that the absorption coefficient also decreases by increasing the doping rate within the same wavelength range The absorption coefficient values were the highest value at 10% aluminum Doped and was 7.7 × 105 cm -1 and decreased with the increase of the doping rate until the lowest value was obtained The aluminum was 40% and the was 3 × 104 cm-1. And the Extinction Coefficient That decreased by increasing the Rates of aluminum doping and obtained the highest value and the equivalent of 0,285 for the sample with a 10% aluminum and then decreased with the increase of the aluminum ratios and reached 0.017 for 40% aluminum , And showed that the permeability of the thin films of zinc oxide increased by increasing the percentage of doping by aluminum according to the ratios specified in the study and the lowest values at the rate of 10% dilution and amounted to 1,9987 and then increased until it reached 2,0023 in the sample with a 40% doping rate.