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Title: Impact of Mg content on native point defects in Mg{sub x}Zn{sub 1−x}O (0 ≤ x ≤ 0.56)

We used depth-resolved cathodoluminescence spectroscopy and surface photovoltage spectroscopy to measure the densities, energy levels, and spatial distributions of zinc/magnesium cation and oxygen vacancies in isostructural, single-phase, non-polar Mg{sub x}Zn{sub 1−x}O alloys over a wide (0 ≤ x ≤ 0.56) range. Within this wide range, both defect types exhibit strong Mg content-dependent surface segregation and pronounced bulk density minima corresponding to unit cell volume minima, which can inhibit defect formation due to electrostatic repulsion. Mg in ZnO significantly reduces native defect densities and their non-polar surface segregation, both major factors in carrier transport and doping of these oxide semiconductors.
Authors:
;  [1] ; ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [1] ;  [8] ;  [8]
  1. Department of Physics, The Ohio State University, 191 West Woodruff Ave., Columbus, Ohio 43210 (United States)
  2. Columbus School for Girls, 56 S. Columbia Ave., Columbus, Ohio 43209 (United States)
  3. Centre de Recherche sur l’Hetero-Epitaxie et ses Applications, Centre National de la Recherche Scientifique (CRHEA-CNRS), Rue B. Gregory, F-06560 Valbonne Sophia Antipolis (France)
  4. (France)
  5. Dpto. Ingeniería Electrónica and ISOM, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid (Spain)
  6. Dpto. Física Aplicada y Centro de Micro-Análisis de Materiales, Universidad Autónoma de Madrid, 28049 Madrid (Spain)
  7. Department of Materials Science and Engineering, The Ohio State University, 2041 College Road N., Columbus, Ohio 43210 (United States)
  8. (United States)
Publication Date:
OSTI Identifier:
22415300
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL materials; Journal Volume: 3; Journal Issue: 6; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BULK DENSITY; CATHODOLUMINESCENCE; CATIONS; CONCENTRATION RATIO; EMISSION SPECTROSCOPY; ENERGY-LEVEL DENSITY; MAGNESIUM COMPOUNDS; OXYGEN; SEGREGATION; SEMICONDUCTOR MATERIALS; SURFACES; VACANCIES; ZINC; ZINC OXIDES