The band structure of CuInTe2 studied by optical reflectivity

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

doi:10.1063/1.5079971

The band structure of CuInTe₂ studied by optical reflectivity

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

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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 E_gA = 1.060 eV and E_gB = 1.078 eV were determined for the A and B valence sub-bands, respectively. The splitting due to crystal-field Δ_CF and spin-orbit effects Δ_SO were calculated as −26.3 meV and 610 meV, respectively, using the determined E_gA and E_gB and a literature value of E_gC.

Original language	English
Article number	062103
Number of pages	4
Journal	Applied Physics Letters
Volume	114
Issue number	6
DOIs	https://doi.org/10.1063/1.5079971
Publication status	Published - 13 Feb 2019

Keywords

optical reflectivity
CuInTe2
semiconductors
electronic band structures
chalcopyrites

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10.1063/1.5079971

Yakushev-etal-apl-2019-The-band-structure-of-CuInTe2-studied-by-optical-reflectivityAccepted author manuscript, 779 KB

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title = "The band structure of CuInTe2 studied by optical reflectivity",

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.",

keywords = "optical reflectivity, CuInTe2, semiconductors, electronic band structures, chalcopyrites",

author = "Yakushev, {M. V.} and Mudryi, {A. V.} and E. K{\"a}rber and Edwards, {P. R.} and Martin, {R. W.}",

year = "2019",

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doi = "10.1063/1.5079971",

language = "English",

volume = "114",

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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

Y1 - 2019/2/13

N2 - 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.

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

U2 - 10.1063/1.5079971

DO - 10.1063/1.5079971

M3 - Article

SN - 0003-6951

VL - 114

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 6

M1 - 062103

ER -

The band structure of CuInTe2 studied by optical reflectivity

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The band structure of CuInTe₂ studied by optical reflectivity