INFLUENCE OF ALUMINUM CONCENTRATION ON THE ELECTRICAL AND OPTICAL PROPERTIES OF ZnO THIN FILMS

Abstract

Al:ZnO (AZO) thin films having with different Al concentrations were deposited on glass substrates by a sol-gel technique. The effects of Al doping on the structural, optical, and electrical properties of Al:ZnO were investigated using with XRD, optical transmittance, and sheet resistance measurements. The concentration of zinc acetate was 0.1 M. Al content in the starting solution was varied from 0 to 20% as the molarity range. Optical transmittance spectra of the films in the form of Film/Glass were used to determine the film thickness and optical band gaps. The optical transmissions of Al:ZnO thin films were higher than 80% in the visible and near infrared region. The optical band gaps of Al:ZnO films decrease with increase of Al content. In order to obtain the average sheet resistance of the films the current and voltage through the probes have been measured for five different position by four-point probe method. The results showed that the sheet resistances of Al:ZnO thin films increased with the Al concentration. Considering the film thickness and geometric factor, the electrical resistivity values were computed. It was observed that the sheet resistance of AZO films up to 10% molarity of Al in the starting solution increased.

Synthesis and Characterization of ZnO/Cellulose Acetate Composite and its Activity as Antibacterial Agent

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Investigating the effect of Aluminum dopping on the structural, optical, electrical, and sensing properties of ZnO films

“…With the increase of Al concentration at 3 wt.%, the peak further shifted towards lower diffraction angle with an additional decrease in peak intensity. The difference in ion sizes betweenZn (0.074 nm) and Al (0.054 nm) generated stress within the film, which led to a shift in peak position and changed the characteristics of the peak[27,28]. The average crystalline size of ZnO thin film was 54.8 nm and slightly decreased with the addition of 1 wt.% (45.09 nm) and 3 wt.% (42.19 nm) Al concentrations.…”