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Journal of Nanomaterials
Volume 2012 (2012), Article ID 963485, 7 pages
http://dx.doi.org/10.1155/2012/963485
Research Article

Optical Properties of ZnO-Alloyed Nanocrystalline Films

1Department of Physics, University of Idaho, Moscow, ID 83844-0903, USA
2Department of Physics and Materials Science, Washington State University, Pullman, WA 99164-2814, USA

Received 27 November 2011; Revised 28 February 2012; Accepted 8 March 2012

Academic Editor: J. C. Sczancoski

Copyright © 2012 Hui Che 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

ZnO is emerging as one of the materials of choice for UV applications. It has a deep excitonic energy level and a direct bandgap of ~3.4 eV. Alloying ZnO with certain atomic constituents adds new optical and electronic functionalities to ZnO. This paper presents research on MgxZn1xO and ZnS1xOx nanocrystalline flexible films, which enable tunable optical properties in the deep-UV and in the visible range. The ZnO and Mg0.3Zn0.7O films were found to have bandgaps at 3.35 and 4.02 eV, respectively. The photoluminescence of the Mg0.3Zn0.7O exhibited a bandedge emission at 3.95 eV, and at lower energy 3.38 eV due to the limited solubility inherent to these alloys. ZnS0.76O0.24 and ZnS0.16O0.84 were found to have bandgaps at 3.21 and 2.65 eV, respectively. The effect of nitrogen doping on ZnS0.16O0.84 is discussed in terms of the highly lattice mismatched nature of these alloys and the resulting valence-band modification.