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Title: Optical properties of single wurtzite/zinc-blende ZnSe nanowires grown at low temperature

ZnSe nanowires with a dominant wurtzite structure have been grown at low temperature (300 °C) by molecular beam epitaxy assisted by solid Au nanoparticles. The nanowires emission is polarized perpendicularly to their axis in agreement with the wurtzite selection rules. Alternations of wurtzite and zinc-blende regions have been observed by transmission electron microscopy, and their impact on the nanowires optical properties has been studied by microphotoluminescence. The nanowires show a dominant intense near-band-edge emission as well as the ZnSe wurtzite free exciton line. A type II band alignment between zinc-blende and wurtzite ZnSe is evidenced by time-resolved photoluminescence. From this measurement, we deduce values for the conduction and valence band offsets of 98 and 50 meV, respectively.
Authors:
 [1] ;  [2] ; ;  [3] ;  [4] ; ;  [3] ;  [4] ;  [5] ;  [2] ;  [1]
  1. IOM-CNR Laboratorio TASC, S. S. 14, Km. 163.5, I-34149 Trieste (Italy)
  2. (Italy)
  3. Univ. Grenoble Alpes, F-38000 Grenoble (France)
  4. (France)
  5. IMEM-CNR, Parco Area delle Scienze 37/A, I-43010 Parma (Italy)
Publication Date:
OSTI Identifier:
22494842
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; GOLD; MEV RANGE; MOLECULAR BEAM EPITAXY; NANOPARTICLES; NANOWIRES; OPTICAL PROPERTIES; PHOTOLUMINESCENCE; SELECTION RULES; TEMPERATURE RANGE 0400-1000 K; TIME RESOLUTION; TRANSMISSION ELECTRON MICROSCOPY; ZINC SELENIDES; ZINC SULFIDES