Study of nature of lattice vibration variations depending on a spatial distribution of zinc over the depth of CdxHg1-xTe epitaxial layers grown on Cd1-yZnyTe substrates

A. I. Belogorokhov; I. A. Denisov; N. A. Smirnova; A. A. Florentsev; N. V. Pashkova

doi:10.1117/12.628707

7 June 2005 Study of nature of lattice vibration variations depending on a spatial distribution of zinc over the depth of Cd_xHg_1-xTe epitaxial layers grown on Cd_1-yZn_yTe substrates

A. I. Belogorokhov, I. A. Denisov, N. A. Smirnova, A. A. Florentsev, N. V. Pashkova

Author Affiliations +

Proceedings Volume 5834, 18th International Conference on Photoelectronics and Night Vision Devices; (2005) https://doi.org/10.1117/12.628707
Event: 18th International Conference on Photoelectronics and Night Vision Devices and Quantum Informatics 2004, 2004, Moscow, Russian Federation

Abstract

In this paper we report on the results of the study of optical properties of Cd_xHg_1-xTe epitaxial layers (EL) grown by the LPE method on Cd_1-xZn_yTe substrates. The values of the band gap of the solid solution forming EL have been obtained from the optical absorption spectra (FTIR) taken in the spectral region of the interband absorption at step-by-step decrease of EL thickness as a result of a chemical etching. In bridge with it the distribution and character of variations in the intensity of lattice vibrations over the layer depth of Cd_xHg_1-xTe / CdZnTe epitaxial structures was investigated. Longitudinal and transverse lattice vibration frequencies of Cd_xHg_1-x-yZn_yTe have been evaluated from the experimental spectra and compared with the theoretically calculated ones within a unit cell version of the random element isodisplacement model. From the comparing ofthe experimental and theoretical results it is possible to draw a conclusion that in immediate neighborhood of the Cd_xHg_1-xTe/Cd_1-yZn_yTe interface the Cd_xHg_1-x-yZn_yTe thin layer is formed under the certain conditions during the EL growth process i.e., zinc atoms in given EL area is necessary to consider not as an impurity atoms but as the components of the cationic sublattice.

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A. I. Belogorokhov, I. A. Denisov, N. A. Smirnova, A. A. Florentsev, and N. V. Pashkova "Study of nature of lattice vibration variations depending on a spatial distribution of zinc over the depth of Cd_xHg_1-xTe epitaxial layers grown on Cd_1-yZn_yTe substrates", Proc. SPIE 5834, 18th International Conference on Photoelectronics and Night Vision Devices, (7 June 2005); https://doi.org/10.1117/12.628707

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KEYWORDS

Zinc

Electroluminescence

Crystals

Solids

Chemical species

Phonons

Liquid phase epitaxy

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