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Studies on Preparation and Properties of ZnO Nanocrystalline Thin Films Obtained via Electrodeposition

Author: YueLan
Tutor: ZhengZuoFeng
School: Xinjiang University
Course: Materials Physics and Chemistry
Keywords: ZnO films cathodic elect rodeposition Optical properties electrical properties XRD
CLC: TB383.2
Type: Master's thesis
Year: 2007
Downloads: 389
Quote: 1
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Abstract


ZnO, which has a wurtzite crystal structure, is a wide bandgap, low dielectric constant and high chemical stability semiconductor. Because of its electrical, optical, and piezoelectric properties, Epitaxial ZnO thin film has many potential applications, especially in the optoelectronic fields. In recent years, the researches and developments of ZnO films have attracted great attention and interest from researchers and the industry.In this paper ZnO nanocrystalline films have been grown by cathodic e1ectrodeposition from dimethylsulfoxide solutions containing ZnCl2 on transparent conducting glass substrates. The effects of the electrodepositional parameters on the microstructure and properties were studied. The structural, electrical and optical properties of the as-grown ZnO films are characterized by X-ray diffractometry(XRD), scanning electronic microscopy(SEM), optical absorption spectra and the Hall measurements. The X-ray diffraction analysis shows that the ZnO nanocrystalline thin films has wurtzite structure,the preferential orientation of the film was changed with the increasing of the deposition current value and the texturation of the films along C direction is enhanced with the increase of deposition temperature. Optical characterizations show that the maximum value of optical transmittance of the film up to 84%,the optical bandgap energy value was about to 3.3eV .A lower sheet resistivity of about 7.57×104?/sq can be obtained for the ZnO films prepared under optimum deposition conditions.Using the same method, the pure CdO films have been grown by cathodic e1ectrodeposition. And films have a highly (200) oriented growth characteristics.Studies of ZnO thin films in the paper are basis for the application and development of ZnO nanocrystalline films in the optoelectronic fields.The preparation method can be applied to prepare other metal oxides.

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