Study of the optical properties of aluminum doped Zinc Oxide using Ultra Violet characterization technique

Abstract

In this work, zinc oxide nano particles were synthesized by sol-gel method, from Zinc Acetate dehydrates (ZnC4H6O4). 2H2O, then the aluminum oxide was also prepared by sol-gel method from Aluminum acetate C6H9AlO6. Then ZnO was mixed by Al2O3 with concentration ratio of (0, 25, 50) % to get four samples of AZO, these samples were characterized with UV-VIS spectrometer, and the optical properties of AZO were studied. It is clearly seen that the energy gap decrease with increasing of the Al doping ratio, and the absorption decrease with increase of the Aluminum concentration, the maximum transmission observed at Aluminum concentration of 25%. The attenuation coefficient has low value at low concentration, but it increases with the increasing of the concentration of Aluminum. These results show that the ratio of 50% of the Aluminum does not make any difference in the absorption, and the perfect doping or mixing takes place only at concentrations low than 25%.