Simulation of the Optical Properties of Zn1−xCoxO Thin Films Grown Onto Glass Substrate by Ultrasonic Spray Pyrolysis
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Date
2023-07-14
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International journal of science and research
Abstract
Zn1-xCoxO thin films (x=0-22 at.%) were prepared using the ultrasonic pyrolysis sputtering technique. The films have a
hexagonal wurtzite structure, confirmed by X-ray difraction, with an estimated average crystallite size in the range of 18-30 nm.
Concerning the optical properties, by applying the Levenberg-Marquardt least squares method, the experimental transmittance data
were perfectly fitted with the transmittance data calculated via a combination of the Wemple-DiDomenico model, the absorption
coefficient of an electronic transition and the Tauc-Urbach model. Decreases in bandgap energy due to the presence of high
concentrations of localized states in thin films were calculated from the Smakula formula
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