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Title: Dielectric function of sol-gel prepared nano-granular zinc oxide by spectroscopic ellipsometry

ZnO thin films have been prepared by sol gel and deposited by spin coating. The dielectric function has been determined by spectroscopic ellipsometry. Ellipsometric spectra are inverted by a direct numerical method without using the standard fitting procedures. The obtained dielectric function presents a broad excitonic effect. The dielectric function is studied using Elliot excitonic theory including exciton plus band-to-band Coulomb interactions with standard Lorentzian broadening. A modification of this model dielectric function with independent bound and unbound exciton contributions is empirically proposed to improve modelling of the band gap excitonic peak.
Authors:
;  [1] ;  [2]
  1. LISM, Université de Reims Champagne-Ardenne, Reims (France)
  2. HORIBA Jobin Yvon S.A.S., Palaiseau (France)
Publication Date:
OSTI Identifier:
22257766
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 18; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DEPOSITS; DIELECTRIC MATERIALS; ELLIPSOMETRY; SIMULATION; SOL-GEL PROCESS; SPECTRA; SPIN-ON COATING; THIN FILMS; ZINC OXIDES