Optical Function Spectra and Bandgap Energy of Cu2SnSe3

S. G. Choi; J. Kang; J. Li; H. Haneef; N. J. Podraza; C. Beall; S. H. Wei; S. T. Christensen; I. L. Repins

doi:10.1063/1.4907202

Optical Function Spectra and Bandgap Energy of Cu2SnSe3

S. G. Choi, J. Kang, J. Li, H. Haneef, N. J. Podraza, C. Beall, S. H. Wei, S. T. Christensen, I. L. Repins

Materials, Chemical, and Computational Science

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Abstract

We present the optical function spectra of Cu₂SnSe₃ 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 Cu₂SnSe₃. 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.

Original language	American English
Article number	Article No. 043902
Number of pages	5
Journal	Applied Physics Letters
Volume	106
Issue number	4
DOIs	https://doi.org/10.1063/1.4907202 https://doi.org/10.1063/1.4907202
State	Published - 26 Jan 2015

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© 2015 AIP Publishing LLC.

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NREL/JA-5J00-63192

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title = "Optical Function Spectra and Bandgap Energy of Cu2SnSe3",

abstract = "We present the optical function spectra of Cu2SnSe3 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 Cu2SnSe3. 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.",

author = "Choi, {S. G.} and J. Kang and J. Li and H. Haneef and Podraza, {N. J.} and C. Beall and Wei, {S. H.} and Christensen, {S. T.} and Repins, {I. L.}",

note = "Publisher Copyright: {\textcopyright} 2015 AIP Publishing LLC.",

year = "2015",

month = jan,

day = "26",

doi = "10.1063/1.4907202",

language = "American English",

volume = "106",

journal = "Applied Physics Letters",

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TY - JOUR

T1 - Optical Function Spectra and Bandgap Energy of Cu2SnSe3

AU - Choi, S. G.

AU - Kang, J.

AU - Li, J.

AU - Haneef, H.

AU - Podraza, N. J.

AU - Beall, C.

AU - Wei, S. H.

AU - Christensen, S. T.

AU - Repins, I. L.

PY - 2015/1/26

Y1 - 2015/1/26

N2 - We present the optical function spectra of Cu2SnSe3 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 Cu2SnSe3. 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.

AB - We present the optical function spectra of Cu2SnSe3 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 Cu2SnSe3. 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.

UR - http://www.scopus.com/inward/record.url?scp=84923899890&partnerID=8YFLogxK

U2 - 10.1063/1.4907202

DO - 10.1063/1.4907202

M3 - Article

AN - SCOPUS:84923899890

SN - 0003-6951

VL - 106

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 4

M1 - Article No. 043902

ER -

Optical Function Spectra and Bandgap Energy of Cu2SnSe3

Abstract

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