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Title: Optical function spectra and bandgap energy of Cu{sub 2}SnSe{sub 3}

We present the optical function spectra of Cu{sub 2}SnSe{sub 3} determined from 0.30 to 6.45 eV by spectroscopic ellipsometry (SE) at room temperature. We analyze the SE data using the Tauc-Lorentz model and obtain the direct-bandgap energy of 0.49 ± 0.02 eV, which is much smaller than the previously known value of 0.84 eV for the monoclinic-phase Cu{sub 2}SnSe{sub 3}. We also perform density-functional theory calculations to obtain the complex dielectric function data, and the results show good agreement with the experimental spectrum. Finally, we discuss the electronic origin of the main optical structures.
Authors:
; ; ; ; ;  [1] ; ; ;  [2]
  1. National Renewable Energy Laboratory, Golden, Colorado 80401 (United States)
  2. Department of Physics and Astronomy and Wright Center for Photovoltaics Innovation and Commercialization, University of Toledo, Toledo, Ohio 43606 (United States)
Publication Date:
OSTI Identifier:
22415214
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 4; 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; COPPER COMPOUNDS; DENSITY FUNCTIONAL METHOD; DIELECTRIC MATERIALS; ELECTRONIC STRUCTURE; ELLIPSOMETRY; MONOCLINIC LATTICES; TEMPERATURE RANGE 0273-0400 K; TIN SELENIDES