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Proceedings Paper

Study on thermal annealing of cadmium zinc telluride (CZT) crystals
Author(s): G. Yang; A. E. Bolotnikov; P. M. Fochuk; G. S. Camarda; Y. Cui; A. Hossain; K. Kim; J. Horace; B. McCall; R. Gul; L. Xu; O. V. Kopach; R. B. James
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Paper Abstract

Cadmium Zinc Telluride (CZT) has attracted increasing interest with its promising potential as a room-temperature nuclear-radiation-detector material. However, different defects in CZT crystals, especially Te inclusions and dislocations, can degrade the performance of CZT detectors. Post-growth annealing is a good approach potentially to eliminate the deleterious influence of these defects. At Brookhaven National Laboratory (BNL), we built up different facilities for investigating post-growth annealing of CZT. Here, we report our latest experimental results. Cd-vapor annealing reduces the density of Te inclusions, while large temperature gradient promotes the migration of small-size Te inclusions. Simultaneously, the annealing lowers the density of dislocations. However, only-Cd-vapor annealing decreases the resistivity, possibly reflecting the introduction of extra Cd in the lattice. Subsequent Te-vapor annealing is needed to ensure the recovery of the resistivity after removing the Te inclusions.

Paper Details

Date Published: 27 August 2010
PDF: 8 pages
Proc. SPIE 7805, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII, 780507 (27 August 2010); doi: 10.1117/12.861372
Show Author Affiliations
G. Yang, Brookhaven National Lab. (United States)
A. E. Bolotnikov, Brookhaven National Lab. (United States)
P. M. Fochuk, Brookhaven National Lab. (United States)
Yuriy Fedkovych Chernivtsi National Univ. (Ukraine)
G. S. Camarda, Brookhaven National Lab. (United States)
Y. Cui, Brookhaven National Lab. (United States)
A. Hossain, Brookhaven National Lab. (United States)
K. Kim, Brookhaven National Lab. (United States)
J. Horace, Brookhaven National Lab. (United States)
Alabama A&M Univ. (United States)
B. McCall, Brookhaven National Lab. (United States)
Alabama A&M Univ. (United States)
R. Gul, Brookhaven National Lab. (United States)
L. Xu, Brookhaven National Lab. (United States)
Northwestern Polytechnical Univ. (China)
O. V. Kopach, Brookhaven National Lab. (United States)
Yuriy Fedkovych Chernivtsi National Univ. (Ukraine)
R. B. James, Brookhaven National Lab. (United States)


Published in SPIE Proceedings Vol. 7805:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII
Arnold Burger; Larry A. Franks; Ralph B. James, Editor(s)

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