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Proceedings Paper

Compensation in semi-intrinsic CdTe-based materials
Author(s): Vladimir N. Babentsov; Victoria Corregidor; Jose Luis Castano; Ernesto Dieguez; Michael Fiederle; Tobias Feltgen; Klaus-Werner Benz
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Paper Abstract

In this report a brief review of the semi-intrinsic conductivity phenomenon in doped CdTe:Cl, CdTe:Ga and Cd1- xZnxTe materials used for room temperature X and (gamma) -ray detectors is discussed. The upper limit of the resistivity is analyzed in a framework of a general three- levels Fermi-statistic model. The role of the residual impurities and impurity-defect interaction as well as segregation of impurity in Te inclusions are discussed. Dependence of the elementary native defects energy formation on the Fermi-level position in CdTe is shown and some reactions between them are taken into consideration for the Fermi-level stabilization near the middle of the band-gap. On the bases of the Fermi-level stabilization phenomenon it is shown that a self-compensation and a maximum doping level in CdTe:Cl, CdTe:Ga and Cd1-xZnxTe depend on the absolute energy of the C (V)-band position. Experimental results of EDAX compositional measurements, photoluminescence are used for illustration of these problems.

Paper Details

Date Published: 22 February 2001
PDF: 14 pages
Proc. SPIE 4355, Fifth International Conference on Material Science and Material Properties for Infrared Optoelectronics, (22 February 2001); doi: 10.1117/12.417791
Show Author Affiliations
Vladimir N. Babentsov, Univ. Autonoma de Madrid and Institute of Semiconductor Physics (Germany)
Victoria Corregidor, Univ. Autonoma de Madrid (Spain)
Jose Luis Castano, Univ. Autonoma de Madrid (Spain)
Ernesto Dieguez, Univ. Autonoma de Madrid (Spain)
Michael Fiederle, Univ. Freiburg (Germany)
Tobias Feltgen, Univ. Freiburg (Germany)
Klaus-Werner Benz, Univ. Freiburg (Germany)

Published in SPIE Proceedings Vol. 4355:
Fifth International Conference on Material Science and Material Properties for Infrared Optoelectronics
Fiodor F. Sizov, Editor(s)

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