The exponential optical absorption band tail of Hg1-xCd xTe

E. Finkman, S. E. Schacham

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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.

Original languageEnglish
Pages (from-to)2896-2900
Number of pages5
JournalJournal of Applied Physics
Issue number10
StatePublished - 1984
Externally publishedYes


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