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Composition and temperature dependence of optical energy gaps of TlGa1−xSbxS2 single crystals

Published online by Cambridge University Press:  31 January 2011

Moon-Seog Jin ,
Jae-Yeol Kim ,
Koung-Suk Kim ,
Sung-Hyu Choe  and
Ho-Jun Song
Moon-Seog Jin
Affiliation:
Department of Physics, Dongshin University, Naju 520–714, Republic of Korea
Jae-Yeol Kim
Affiliation:
Department of Mechanical Engineering, Chosun University, Kwangju 501–759, Republic of Korea
Koung-Suk Kim
Affiliation:
Department of Mechanical Engineering, Chosun University, Kwangju 501–759, Republic of Korea
Sung-Hyu Choe
Affiliation:
Department of Physics, Chosun University, Kwangju 501–759, Republic of Korea
Ho-Jun Song
Affiliation:
Kwangju Branch, Korea Basic Science Institute, Kwangju 500–757, Republic of Korea
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Abstract

TlGa1−xSbxS2 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) single crystals were grown using the Bridgman–Stockbarger method. The direct energy gaps of the single crystals were found to be 2.586, 2.459, 2.344, 2.228, 2.119, and 1.987 eV for the composition x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0, respectively, at 20 K. The indirect energy gaps were found to be 2.479, 2.357, 2.232, 2.118, 1.983, and 1.871 eV for the composition x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0, respectively, at 20 K. The optical energy gaps decreased linearly with increasing composition x. The temperature dependence of the optical energy gaps for each of the single crystals was well fitted with the Varshni equation.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 3 , March 2003 , pp. 620 - 623
Copyright
Copyright © Materials Research Society 2003

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References

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