The exponential optical absorption band tail of Hg1 - xCdxTe
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 Hg1-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.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- November 1984
- DOI:
- 10.1063/1.333828
- Bibcode:
- 1984JAP....56.2896F
- Keywords:
-
- Band Structure Of Solids;
- Energy Gaps (Solid State);
- Mercury Cadmium Tellurides;
- Photoabsorption;
- Absorptivity;
- Electromagnetic Absorption;
- Photonics;
- Refractivity;
- Solid-State Physics