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Title: Tunable zinc interstitial related defects in ZnMgO and ZnCdO films

We report tunable band gap of ZnO thin films grown on quartz substrates by radio frequency magnetron sputtering. The zinc interstitial (Zn{sub i}) defects in ZnO films were investigated by X-ray diffraction, Raman scattering, Auger spectra, first-principle calculations, and Hall measurement. Undoped ZnO film exhibits an anomalous Raman mode at 275 cm{sup −1}. We first report that 275 cm{sup −1} mode also can be observed in ZnO films alloyed with Mg and Cd, whose Raman intensities, interestingly, decrease and increase with increasing Mg and Cd alloying content, respectively. Combined with the previous investigations, it is deduced that 275 cm{sup −1} mode is attributed to Zn{sub i} related defects, which is demonstrated by our further experiment and theoretical calculation. Consequently, the concentration of Zn{sub i} related defects in ZnO can be tuned by alloying Mg and Cd impurity, which gives rise to different conductivity in ZnO films. These investigations help to further understand the controversial origin of the additional Raman mode at 275 cm{sup −1} and also the natural n-type conductivity in ZnO.
Authors:
;  [1] ;  [2] ; ; ;  [1] ;  [3] ; ; ;  [4]
  1. State Key Laboratory of Mechanical Transmission, College of Physics, Chongqing University, Chongqing 401331 (China)
  2. (China)
  3. Research Center for Materials Interdisciplinary Sciences, Chongqing University of Arts and Sciences, Chongqing 402160 (China)
  4. Key Laboratory of Optoelectronic Functional Materials of Chongqing, College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing, Chongqing 401331 (China)
Publication Date:
OSTI Identifier:
22402848
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 14; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; AUGER ELECTRON SPECTROSCOPY; CADMIUM OXIDES; CONCENTRATION RATIO; ELECTRIC CONDUCTIVITY; ENERGY GAP; HALL EFFECT; INTERSTITIALS; MAGNESIUM OXIDES; MAGNETRONS; QUARTZ; RADIOWAVE RADIATION; RAMAN EFFECT; RAMAN SPECTRA; SPUTTERING; SUBSTRATES; THIN FILMS; X-RAY DIFFRACTION; ZINC; ZINC OXIDES