Effects of thermal annealing on the structural properties of CdZnTe crystals

G. Yang; A. E. Bolotnikov; P. M. Fochuk; Y. Cui; G. S. Camarda; A. Hossain; K. H. Kim; J. Horace; B. McCall; R. Gul; O. V. Kopach; S. U. Egarievwe; R. B. James

doi:10.1117/12.894961

27 September 2011 Effects of thermal annealing on the structural properties of CdZnTe crystals

G. Yang, A. E. Bolotnikov, P. M. Fochuk, Y. Cui, G. S. Camarda, A. Hossain, K. H. Kim, J. Horace, B. McCall, R. Gul, O. V. Kopach, S. U. Egarievwe, R. B. James

Author Affiliations +

Proceedings Volume 8142, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIII; 814217 (2011) https://doi.org/10.1117/12.894961
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

Abstract

Although cadmium zinc telluride (CZT) is one of leading materials for fabricating room-temperature nuclear-radiation- detectors, different defects in the crystals can degrade the performance of CZT detectors. Post-growth thermal annealing potentially offers a satisfactory way to eliminate the deleterious influence of these defects. Here, we report that the annealing of CZT in Cd vapor effectively lowers the density of Te inclusions. It takes a much longer annealing time to eliminate separate large Te inclusions than small ones; however, the annealing time is greatly reduced when the large Te inclusions are distributed along grain boundaries. We found that sub-grain boundaries still exist after the annealing at 500 °C, indicating that a higher annealing temperature might be needed.

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G. Yang, A. E. Bolotnikov, P. M. Fochuk, Y. Cui, G. S. Camarda, A. Hossain, K. H. Kim, J. Horace, B. McCall, R. Gul, O. V. Kopach, S. U. Egarievwe, and R. B. James "Effects of thermal annealing on the structural properties of CdZnTe crystals", Proc. SPIE 8142, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIII, 814217 (27 September 2011); https://doi.org/10.1117/12.894961

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