Characterization of Ti-doped CdTe and Cd1-xHgxTe crystals

Yuriy P. Gnatenko; Ivan O. Faryna; Petro M. Bukivskij; Roman V. Gamernyk; Nickolai V. Kukhtarev; Tatiana V. Kukhtareva; Stepan Yu. Paranchych; Lidia D. Paranchych

doi:10.1117/12.545851

3 December 2003 Characterization of Ti-doped CdTe and Cd_1-xHg_xTe crystals

Yuriy P. Gnatenko, Ivan O. Faryna, Petro M. Bukivskij, Roman V. Gamernyk, Nickolai V. Kukhtarev, Tatiana V. Kukhtareva, Stepan Yu. Paranchych, Lidia D. Paranchych

Author Affiliations +

Proceedings Volume 5257, Ninth International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals; (2003) https://doi.org/10.1117/12.545851
Event: 2003 Chapter books, 2003, Bellingham, WA, United States

Abstract

Studies were carried out of the low-temperature optical and photoelectric properties of Ti-doped CdTe and Cd_1-xHg_xTe crystals. The absorption is due to intracentral transitions from the main ³A₂(³F)-state to excited ³T₁(³P)- (1.15 eV) and ³T₁(³F)-(0.65 eV) states. It was shown that the maximum of photogalvanic current band corresponds to the energy 1.12 eV. It indicates that the excited ³T₁(³P)-state of the Ti²⁺ions is in the resonance with the conduction band and is located near the bottom at a distance not more than 50 meV. The analogous structure of the absorption and photogalvanic current spectra appear also the Cd_1-xHg_xTe:Ti crystals. In this case the long-wave edge of absorption band is some what prolonged. Therefore the use of Cd_1-xHg_xTe:Ti crystals makes it possible to move the spectral region of their photosensitivity to the long-wave side. On the base of the results of photoluminescence and photogalvanic current spectra it was shown that main structural defects for the investigated crystals are V _Cd, and also acceptor complexes of type (V^2-_Cd + D⁺)^-. These defects participate in compensation of charge in the investigated crystals, which are semiinsulating and therefore suitable for carrying out the photorefractive measurements.

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Yuriy P. Gnatenko, Ivan O. Faryna, Petro M. Bukivskij, Roman V. Gamernyk, Nickolai V. Kukhtarev, Tatiana V. Kukhtareva, Stepan Yu. Paranchych, and Lidia D. Paranchych "Characterization of Ti-doped CdTe and Cd_1-xHg_xTe crystals", Proc. SPIE 5257, Ninth International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals, (3 December 2003); https://doi.org/10.1117/12.545851

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