Optical Properties of ZnO-Alloyed Nanocrystalline Films

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 MgxZn1−xO and ZnS1−xOx na...

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Bibliographic Details
Published in:Journal of nanomaterials 2012-01, Vol.2012 (2012), p.1-7
Main Authors: Bergman, Leah, McCluskey, M. D., Yeh, Wei Jiang, Huso, Michelle, Thapa, Dinesh, Morrison, John L., Huso, Jesse, Che, Hui, Tarun, M. C.
Format: Article
Language:English
Subjects:
Alloying
Alloying additive
Alloys
Experiments
Materials science
Metallurgy
Nanocrystals
Nanomaterials
Nitrogen
Optical properties
Residual stress
Solubility
Spectrum analysis
Zinc oxide
Zinc oxides
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Summary: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 MgxZn1−xO and ZnS1−xOx 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.
ISSN:1687-4110
1687-4129
DOI:10.1155/2012/963485