Temperature-dependent optical properties of epitaxial CdO thin films determined by spectroscopic ellipsometry and Raman scattering

S. G. Choi; L. M. Gedvilas; S. Y. Hwang; T. J. Kim; Y. D. Kim; J. Zúñiga-Pérez; V. Muñoz Sanjosé

doi:10.1063/1.4803876

Temperature-dependent optical properties of epitaxial CdO thin films determined by spectroscopic ellipsometry and Raman scattering

S. G. Choi
, L. M. Gedvilas
, S. Y. Hwang
, T. J. Kim
, Y. D. Kim
, J. Zúñiga-Pérez
, V. Muñoz Sanjosé

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

We report temperature-dependent optical properties of epitaxial CdO thin films grown by metal-organic vapor phase epitaxy on sapphire substrates. Dielectric function ₁ i₂ spectra for CdO were extracted from the multilayer modeling of ellipsometric data, using a set of Tauc-Lorentz oscillators from 0.74 to 6.43 eV in the temperature range between 24 and 650 K. Temperature dependence of the energy for the major optical structures in the spectra was analyzed by using Varshnis approximation. Raman scattering (RS) spectroscopy was used to characterize the vibrational properties of CdO from 77 to 500 K. Several RS peaks were observed in the wavenumber range from 100 to 1000 cm^-1. Peak positions, accurately determined by a series of Gaussian-Lorentzian mixed line profiles, exhibit a weak linear dependence on temperature.

Original language	English
Article number	183515
Journal	Journal of Applied Physics
Volume	113
Issue number	18
DOIs	https://doi.org/10.1063/1.4803876
Publication status	Published - 14 May 2013

Bibliographical note

Funding Information:
This work was supported by the U.S. Department of Energy under Contract No. DE-AC36-08-GO28308. The work done at Kyung Hee University was supported by WCU program (Grant No. R33-2012-000-10118-0) and NRF program (Grant No. 2012-0004085) funded by the MEST. The work done at the Universitat de València was supported by the Spanish Government under the Project Nos. MAT2007-66129, and TEC2011-28076-C02-02, and Generalitat Valenciana under the projects Prometeo/2011-035 and ISIC/2012/008, Institute of Nanotechnologies for Clean Energies.

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@article{407696d7b730401ab87ed0d1ca9202d1,

title = "Temperature-dependent optical properties of epitaxial CdO thin films determined by spectroscopic ellipsometry and Raman scattering",

abstract = "We report temperature-dependent optical properties of epitaxial CdO thin films grown by metal-organic vapor phase epitaxy on sapphire substrates. Dielectric function 1 i2 spectra for CdO were extracted from the multilayer modeling of ellipsometric data, using a set of Tauc-Lorentz oscillators from 0.74 to 6.43 eV in the temperature range between 24 and 650 K. Temperature dependence of the energy for the major optical structures in the spectra was analyzed by using Varshnis approximation. Raman scattering (RS) spectroscopy was used to characterize the vibrational properties of CdO from 77 to 500 K. Several RS peaks were observed in the wavenumber range from 100 to 1000 cm-1. Peak positions, accurately determined by a series of Gaussian-Lorentzian mixed line profiles, exhibit a weak linear dependence on temperature.",

author = "Choi, \{S. G.\} and Gedvilas, \{L. M.\} and Hwang, \{S. Y.\} and Kim, \{T. J.\} and Kim, \{Y. D.\} and J. Z{\'u}{\~n}iga-P{\'e}rez and \{Mu{\~n}oz Sanjos{\'e}\}, V.",

note = "Funding Information: This work was supported by the U.S. Department of Energy under Contract No. DE-AC36-08-GO28308. The work done at Kyung Hee University was supported by WCU program (Grant No. R33-2012-000-10118-0) and NRF program (Grant No. 2012-0004085) funded by the MEST. The work done at the Universitat de Val{\`e}ncia was supported by the Spanish Government under the Project Nos. MAT2007-66129, and TEC2011-28076-C02-02, and Generalitat Valenciana under the projects Prometeo/2011-035 and ISIC/2012/008, Institute of Nanotechnologies for Clean Energies.",

year = "2013",

month = may,

day = "14",

doi = "10.1063/1.4803876",

language = "English",

volume = "113",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics",

number = "18",

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T1 - Temperature-dependent optical properties of epitaxial CdO thin films determined by spectroscopic ellipsometry and Raman scattering

AU - Choi, S. G.

AU - Gedvilas, L. M.

AU - Hwang, S. Y.

AU - Kim, T. J.

AU - Kim, Y. D.

AU - Zúñiga-Pérez, J.

AU - Muñoz Sanjosé, V.

N1 - Funding Information: This work was supported by the U.S. Department of Energy under Contract No. DE-AC36-08-GO28308. The work done at Kyung Hee University was supported by WCU program (Grant No. R33-2012-000-10118-0) and NRF program (Grant No. 2012-0004085) funded by the MEST. The work done at the Universitat de València was supported by the Spanish Government under the Project Nos. MAT2007-66129, and TEC2011-28076-C02-02, and Generalitat Valenciana under the projects Prometeo/2011-035 and ISIC/2012/008, Institute of Nanotechnologies for Clean Energies.

PY - 2013/5/14

Y1 - 2013/5/14

N2 - We report temperature-dependent optical properties of epitaxial CdO thin films grown by metal-organic vapor phase epitaxy on sapphire substrates. Dielectric function 1 i2 spectra for CdO were extracted from the multilayer modeling of ellipsometric data, using a set of Tauc-Lorentz oscillators from 0.74 to 6.43 eV in the temperature range between 24 and 650 K. Temperature dependence of the energy for the major optical structures in the spectra was analyzed by using Varshnis approximation. Raman scattering (RS) spectroscopy was used to characterize the vibrational properties of CdO from 77 to 500 K. Several RS peaks were observed in the wavenumber range from 100 to 1000 cm-1. Peak positions, accurately determined by a series of Gaussian-Lorentzian mixed line profiles, exhibit a weak linear dependence on temperature.

AB - We report temperature-dependent optical properties of epitaxial CdO thin films grown by metal-organic vapor phase epitaxy on sapphire substrates. Dielectric function 1 i2 spectra for CdO were extracted from the multilayer modeling of ellipsometric data, using a set of Tauc-Lorentz oscillators from 0.74 to 6.43 eV in the temperature range between 24 and 650 K. Temperature dependence of the energy for the major optical structures in the spectra was analyzed by using Varshnis approximation. Raman scattering (RS) spectroscopy was used to characterize the vibrational properties of CdO from 77 to 500 K. Several RS peaks were observed in the wavenumber range from 100 to 1000 cm-1. Peak positions, accurately determined by a series of Gaussian-Lorentzian mixed line profiles, exhibit a weak linear dependence on temperature.

UR - https://www.scopus.com/pages/publications/84878072116

U2 - 10.1063/1.4803876

DO - 10.1063/1.4803876

M3 - Article

AN - SCOPUS:84878072116

SN - 0021-8979

VL - 113

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 18

M1 - 183515

ER -

Temperature-dependent optical properties of epitaxial CdO thin films determined by spectroscopic ellipsometry and Raman scattering

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