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Title: Role of compositional fluctuations and their suppression on the strain and luminescence of InGaN alloys

Advanced electron microscopy techniques are combined for the first time to measure the composition, strain, and optical luminescence, of InGaN/GaN multi-layered structures down to the nanometer scale. Compositional fluctuations observed in InGaN epilayers are suppressed in these multi-layered structures up to a thickness of 100 nm and for an indium composition of 16%. The multi-layered structures remain pseudomorphically accommodated on the GaN substrate and exhibit single-peak, homogeneous luminescence so long as the composition is homogeneous.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5] ; ;  [6] ;  [7] ; ;  [8] ;  [9] ;  [1] ;  [2]
  1. Georgia Institute of Technology, GT-Lorraine, 2 Rue Marconi, 57070 Metz (France)
  2. (France)
  3. CNRS-LPN, Route de Nozay, F-91460 Marcoussis (France)
  4. CNRS, Institut d'Électronique, de Microélectronique and de Nanotechnologie, UMR 8520, F-59652 Villeneuve D'Ascq (France)
  5. Laboratoire de Physique des Solides, Bâtiment 510, CNRS UMR 8502, Université Paris-Sud XI, F-91405 Orsay (France)
  6. CEMES-CNRS and Université de Toulouse, 29 rue J. Marvig, 31055 Toulouse (France)
  7. Groupe d'Étude de la Matière Condensée, Université de Versailles Saint-Quentin–CNRS, 45 Avenue des États-Unis, Versailles 78035 (France)
  8. Orange Labs, 40 rue du Général Leclerc, 92794 Issy-les-Moulineaux Cedex 9 (France)
  9. UMI 2958, Georgia Tech-CNRS, 2 Rue Marconi, 57070 Metz (France)
Publication Date:
OSTI Identifier:
22413071
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 5; 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; ELECTRON MICROSCOPY; EMISSION SPECTRA; FLUCTUATIONS; GALLIUM NITRIDES; HETEROJUNCTIONS; INDIUM COMPOUNDS; LUMINESCENCE; STRAINS; SUBSTRATES