The band structure of CuInTe2 studied by optical reflectivity

M. V. Yakushev, A. V. Mudryi, E. Kärber, P. R. Edwards, R. W. Martin

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

CuInTe2 is a semiconductor with high potential for use as a thermoelectric material and as the absorber in thin film solar cells. Studying the optical reflectivity spectra of CuInTe2 single crystals resolves resonances at 1.054 eV and 1.072 eV, which are assigned to the A and B free excitons. Photoluminescence spectra exhibited a peak due to the A free exciton at 1.046 eV. Varshni coefficients were found for both excitons. Zero temperature bandgaps EgA = 1.060 eV and EgB = 1.078 eV were determined for the A and B valence sub-bands, respectively. The splitting due to crystal-field ΔCF and spin-orbit effects ΔSO were calculated as −26.3 meV and 610 meV, respectively, using the determined EgA and EgB and a literature value of EgC.
LanguageEnglish
Article number062103
Number of pages4
JournalApplied Physics Letters
Volume114
Issue number6
DOIs
Publication statusPublished - 13 Feb 2019

Fingerprint

excitons
reflectance
thermoelectric materials
crystal field theory
absorbers
solar cells
valence
orbits
photoluminescence
single crystals
coefficients
thin films
temperature

Keywords

  • optical reflectivity
  • CuInTe2
  • semiconductors
  • electronic band structures
  • chalcopyrites

Cite this

Yakushev, M. V. ; Mudryi, A. V. ; Kärber, E. ; Edwards, P. R. ; Martin, R. W. / The band structure of CuInTe2 studied by optical reflectivity. In: Applied Physics Letters. 2019 ; Vol. 114, No. 6.
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The band structure of CuInTe2 studied by optical reflectivity. / Yakushev, M. V.; Mudryi, A. V.; Kärber, E.; Edwards, P. R.; Martin, R. W.

In: Applied Physics Letters, Vol. 114, No. 6, 062103, 13.02.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The band structure of CuInTe2 studied by optical reflectivity

AU - Yakushev, M. V.

AU - Mudryi, A. V.

AU - Kärber, E.

AU - Edwards, P. R.

AU - Martin, R. W.

PY - 2019/2/13

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AB - CuInTe2 is a semiconductor with high potential for use as a thermoelectric material and as the absorber in thin film solar cells. Studying the optical reflectivity spectra of CuInTe2 single crystals resolves resonances at 1.054 eV and 1.072 eV, which are assigned to the A and B free excitons. Photoluminescence spectra exhibited a peak due to the A free exciton at 1.046 eV. Varshni coefficients were found for both excitons. Zero temperature bandgaps EgA = 1.060 eV and EgB = 1.078 eV were determined for the A and B valence sub-bands, respectively. The splitting due to crystal-field ΔCF and spin-orbit effects ΔSO were calculated as −26.3 meV and 610 meV, respectively, using the determined EgA and EgB and a literature value of EgC.

KW - optical reflectivity

KW - CuInTe2

KW - semiconductors

KW - electronic band structures

KW - chalcopyrites

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