Optical Properties and Morphology of Al Doped Zinc Oxide Thin Film Exposed on Wet and Dry Conditions

Abstract

The optical properties and morphology of Aluminum (Al) doped Zinc Oxide (ZnO) thin films prepared by sol-gel method have been investigated. The thin films were prepared at annealing temperature of 550 OC and have been exposed under wet and dry conditions. UV-Vissmeasurements have been carried out to investigate the optical properties while Scanning Electron Microscope (SEM) to investigate morphology. The grain size of films was increased with increased annealing temperature. The average optical transmittance became about 80% in the visible and had sharp ultraviolet absorption edges at 380 nm. The absorption edge analysis revealed that the optical band gap energy for the films was ~ 3.26 eV. The surface morphology in increasing annealing temperature has a big size and less porosity between particles.