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Title: Electronic structure and optical properties of CdS{sub x}Se{sub 1−x} solid solution nanostructures from X-ray absorption near edge structure, X-ray excited optical luminescence, and density functional theory investigations

The electronic structure and optical properties of a series of iso-electronic and iso-structural CdS{sub x}Se{sub 1−x} solid solution nanostructures have been investigated using X-ray absorption near edge structure, extended X-ray absorption fine structure, and X-ray excited optical luminescence at various absorption edges of Cd, S, and Se. It is found that the system exhibits compositions, with variable local structure in-between that of CdS and CdSe accompanied by tunable optical band gap between that of CdS and CdSe. Theoretical calculation using density functional theory has been carried out to elucidate the observations. It is also found that luminescence induced by X-ray excitation shows new optical channels not observed previously with laser excitation. The implications of these observations are discussed.
Authors:
 [1] ; ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7]
  1. DESY (Deutsches Elektronen-Synchrotron), FS-PEX, Notkestrasse 85, 22607 Hamburg (Germany)
  2. Department of Chemistry, University of Western Ontario, London, ON N6A5B7 (Canada)
  3. Cornell High Energy Synchrotron Source (CHESS), Cornell University, Ithaca, NY 14853 (United States)
  4. Institute of Functional Nano and Soft Materials (FUNSOM) and Soochow University-Western University Center for Synchrotron Radiation Research, Soochow University, Suzhou, Jiangsu, 215123 (China)
  5. Canadian Light Source, University of Saskatchewan, Saskatoon, SK S7N2V3 (Canada)
  6. Center Of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR (China)
  7. Institute of Physics and Electronic Information, Yunnan Normal University, Kunming, Yunnan, 650500 (China)
Publication Date:
OSTI Identifier:
22402668
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 19; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; CADMIUM SELENIDES; CADMIUM SULFIDES; DENSITY FUNCTIONAL METHOD; ELECTRONIC STRUCTURE; EXCITATION; FINE STRUCTURE; LASERS; LUMINESCENCE; NANOSTRUCTURES; OPTICAL PROPERTIES; SOLID SOLUTIONS; X RADIATION