Studies of deep trapping levels in undoped and Sn-doped Cd1-xZnxTe by thermoelectric effect spectroscopy and thermally stimulated current

Nemanja Krsmanovic; Alan W. Hunt; Kelvin G. Lynn; Patrick J. Flint; Howard L. Glass

doi:10.1117/12.407577

21 November 2000 Studies of deep trapping levels in undoped and Sn-doped Cd_1-xZn_xTe by thermoelectric effect spectroscopy and thermally stimulated current

Nemanja Krsmanovic, Alan W. Hunt, Kelvin G. Lynn, Patrick J. Flint, Howard L. Glass

Author Affiliations +

Proceedings Volume 4141, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics II; (2000) https://doi.org/10.1117/12.407577
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

Thermoelectric effect spectroscopy (TEES) and thermally stimulated current (TSC) were used to study the deep trapping levels in undoped and Sn doped Cd_1-xZn_xTe crystals. Temperature maximum, varying heating rate and initial rise methods were used to extract activation energies and trapping cross sections of the deep trapping levels in the samples. The concentration of deep levels was estimated from the resistivity data using Neumark model. The pure sample had deep trapping levels with ionization energies of E_V + 0.73 eV and E_V + 0.74 eV. The concentration of the deep levels was estimated at 500 ppb. These deep levels were associated with intrinsic defects due to Cd vacancies and Te antisites. In the Sn doped samples deep levels at E_V + 0.34 eV, E_V + 0.55 eV and E_V + 0.73 eV were observed. The level at E_V + 0.55 eV was associated with Sn, while the E_V + 0.34 eV and E_V + 0.73 eV levels were associated with Cd vacancies. The concentration of these levels was estimated a 10000 ppb. The pulse height measurements on these samples indicated that Sn doping did not improve the detector performance.

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Nemanja Krsmanovic, Alan W. Hunt, Kelvin G. Lynn, Patrick J. Flint, and Howard L. Glass "Studies of deep trapping levels in undoped and Sn-doped Cd_1-xZn_xTe by thermoelectric effect spectroscopy and thermally stimulated current", Proc. SPIE 4141, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics II, (21 November 2000); https://doi.org/10.1117/12.407577

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