1. bookVolume 33 (2015): Issue 3 (September 2015)
Journal Details
First Published
16 Apr 2011
Publication timeframe
4 times per year
access type Open Access

Preparation, structure and optical properties of transparent conducting gallium-doped zinc oxide thin films

Published Online: 30 Aug 2016
Volume & Issue: Volume 33 (2015) - Issue 3 (September 2015)
Page range: 470 - 481
Received: 27 Jun 2013
Accepted: 28 Mar 2015
Journal Details
First Published
16 Apr 2011
Publication timeframe
4 times per year

Highly conductive gallium-doped zinc oxide (GZO) transparent thin films were deposited on glass substrates by RF mag­netron sputtering. The deposited films were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), four-point probe and UV-Vis spectrophotometer, respectively. The effect of growth temperature on the structure and optoelectrical properties of the films was investigated. The results demonstrate that high quality GZO films oriented with their crystal­lographic c-axis perpendicular to the substrates are obtained. The structure and optoelectrical properties of the films are highly dependent on the growth temperature. It is found that with increasing growth temperature, the average visible transmittance of the deposited films is enhanced and the residual stress in the thin films is obviously relaxed. The GZO films deposited at the growth temperature of 400°C, which have the largest grain size (74.3 nm), the lowest electrical resistivity (1.31×10-3 Ω·cm) and the maximum figure of merit (1.46×1O-2Ω-1), exhibit the best optoelectrical properties. Furthermore, the optical proper­ties of the deposited films were determined by the optical characterization methods and the optical energy-gaps were evaluated by extrapolation method. A blue shift of the optical energy gap is observed with an increase in the growth temperature.


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