The exponential optical absorption band tail of Hg1-xCd xTe

E. Finkman; S. E. Schacham

doi:10.1063/1.333828

The exponential optical absorption band tail of Hg_1-xCd _xTe

E. Finkman, S. E. Schacham

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Abstract

The optical absorption edges of Hg_0.71Cd_0.29Te and CdTe were measured over the temperature range 80≤T≤300 K. The refractive indices of these materials are determined over a large energy range at T=300 K and their dispersion relation is given. The absorption band tail of Hg _1-xCd_xTe has an exponential shape. Its slope increases with decreasing temperature. It is suggested that this tail is not caused by permanent lattice disorder but is a material property. An empirical expression for the absorption coefficient as a function of temperature and composition is derived. Using this expression, the zero-intercept cut-on energy of the infrared transmission spectrum at room temperature is used to define the composition for any desired thickness of Hg_1-xCd_xTe sample.

Original language	English
Pages (from-to)	2896-2900
Number of pages	5
Journal	Journal of Applied Physics
Volume	56
Issue number	10
DOIs	https://doi.org/10.1063/1.333828
State	Published - 1984
Externally published	Yes

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abstract = "The optical absorption edges of Hg0.71Cd0.29Te and CdTe were measured over the temperature range 80≤T≤300 K. The refractive indices of these materials are determined over a large energy range at T=300 K and their dispersion relation is given. The absorption band tail of Hg 1-xCdxTe has an exponential shape. Its slope increases with decreasing temperature. It is suggested that this tail is not caused by permanent lattice disorder but is a material property. An empirical expression for the absorption coefficient as a function of temperature and composition is derived. Using this expression, the zero-intercept cut-on energy of the infrared transmission spectrum at room temperature is used to define the composition for any desired thickness of Hg1-xCdxTe sample.",

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AU - Finkman, E.

AU - Schacham, S. E.

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N2 - The optical absorption edges of Hg0.71Cd0.29Te and CdTe were measured over the temperature range 80≤T≤300 K. The refractive indices of these materials are determined over a large energy range at T=300 K and their dispersion relation is given. The absorption band tail of Hg 1-xCdxTe has an exponential shape. Its slope increases with decreasing temperature. It is suggested that this tail is not caused by permanent lattice disorder but is a material property. An empirical expression for the absorption coefficient as a function of temperature and composition is derived. Using this expression, the zero-intercept cut-on energy of the infrared transmission spectrum at room temperature is used to define the composition for any desired thickness of Hg1-xCdxTe sample.

AB - The optical absorption edges of Hg0.71Cd0.29Te and CdTe were measured over the temperature range 80≤T≤300 K. The refractive indices of these materials are determined over a large energy range at T=300 K and their dispersion relation is given. The absorption band tail of Hg 1-xCdxTe has an exponential shape. Its slope increases with decreasing temperature. It is suggested that this tail is not caused by permanent lattice disorder but is a material property. An empirical expression for the absorption coefficient as a function of temperature and composition is derived. Using this expression, the zero-intercept cut-on energy of the infrared transmission spectrum at room temperature is used to define the composition for any desired thickness of Hg1-xCdxTe sample.

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The exponential optical absorption band tail of Hg_1-xCd _xTe

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