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Title: Ellipsometric characterization and density-functional theory analysis of anisotropic optical properties of single-crystal α-SnS

We report on the anisotropic optical properties of single-crystal tin monosulfide (SnS). The components ε{sub a}, ε{sub b}, and ε{sub c} of the pseudodielectric-function tensor (ε)=(ε₁)+i(ε₂) spectra are taken from 0.73 to 6.45 eV by spectroscopic ellipsometry. The measured (ε) spectra are in a good agreement with the results of the calculated dielectric response from hybrid density functional theory. The (ε) spectra show the direct band-gap onset and a total of eight above-band-gap optical structures that are associated with the interband-transition critical points (CPs). We obtain accurate CP energies by fitting analytic CP expressions to second-energy-derivatives of the (ε) data. Their probable electronic origins and implications for photovoltaic applications are discussed.
Authors:
;  [1] ; ;  [2] ; ;  [3] ; ; ;  [4]
  1. Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
  2. Centre for Sustainable Chemical Technologies and Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY (United Kingdom)
  3. National Renewable Energy Laboratory, Golden, Colorado 80401 (United States)
  4. Crystallography—Institute of Earth and Environmental Sciences, University of Freiburg, 79104 Freiburg (Germany)
Publication Date:
OSTI Identifier:
22306163
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; DENSITY FUNCTIONAL METHOD; DIELECTRIC MATERIALS; ELLIPSOMETRY; ENERGY-LEVEL TRANSITIONS; EV RANGE; MONOCRYSTALS; OPTICAL PROPERTIES; PHOTOVOLTAIC EFFECT; SPECTRA; TIN SULFIDES