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Journal of Nanomaterials
Volume 2015, Article ID 627650, 5 pages
http://dx.doi.org/10.1155/2015/627650
Research Article

Mg Doping Effect on the Microstructural and Optical Properties of ZnO Nanocrystalline Films

1Department of Electronic Engineering, Hsiuping University of Science and Technology, Taichung 41280, Taiwan
2Department of Electrical Engineering, National Chung Hsing University, Taichung 40227, Taiwan

Received 16 October 2014; Accepted 17 November 2014

Academic Editor: Changhong Ke

Copyright © 2015 San-Lin Young et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Transparent (, 0.03, and 0.05) nanocrystalline films were prepared by sol-gel method followed by thermal annealing treatment of 700°C. Mg doping effect on the microstructural and optical properties of the films is investigated. From SEM images of all films, mean sizes of uniform spherical grains increase progressively. Pure wurtzite structure is obtained from the results of XRD. Grain sizes increase from 34.7 nm for and 37.9 nm for to 42.1 nm for deduced from the XRD patterns. The photoluminescence spectra of the films show a strong ultraviolet emission and a weak visible light emission peak. The enhancement of ultraviolet emission and reduction of visible emission are observed due to the increase of Mg doping concentration and the corresponding decrease of oxygen vacancy defects. Besides, the characteristics of the dark/photo currents with heterojunction are studied for photodetector application.