Study on thermal annealing of cadmium zinc telluride (CZT) crystals

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

doi:10.1117/12.861372

Study on thermal annealing of cadmium zinc telluride (CZT) crystals

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

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Citations (Scopus)

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.

Original language	English
Title of host publication	Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII
DOIs	https://doi.org/10.1117/12.861372
Publication status	Published - 2010
Externally published	Yes
Event	Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII - San Diego, CA, United States Duration: 2010 Aug 2 → 2010 Aug 4

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	7805
ISSN (Print)	0277-786X

Other

Other	Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII
Country	United States
City	San Diego, CA
Period	10/8/2 → 10/8/4

Keywords

CZT
Te inclusions
annealing
dislocations
radiation detection

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

Access to Document

10.1117/12.861372

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Cite this

Yang, G., Bolotnikov, A. E., Fochuk, P. M., Camarda, G. S., Cui, Y., Hossain, A., Kim, K., Horace, J., McCall, B., Gul, R., Xu, L., Kopach, O. V., & James, R. B. (2010). Study on thermal annealing of cadmium zinc telluride (CZT) crystals. In Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII [780507] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7805). https://doi.org/10.1117/12.861372

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

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII. 2010. 780507 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7805).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Yang, G, Bolotnikov, AE, Fochuk, PM, Camarda, GS, Cui, Y, Hossain, A, Kim, K, Horace, J, McCall, B, Gul, R, Xu, L, Kopach, OV & James, RB 2010, Study on thermal annealing of cadmium zinc telluride (CZT) crystals. in Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII., 780507, Proceedings of SPIE - The International Society for Optical Engineering, vol. 7805, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII, San Diego, CA, United States, 10/8/2. https://doi.org/10.1117/12.861372

Yang, G. ; Bolotnikov, A. E. ; Fochuk, P. M. ; Camarda, G. S. ; Cui, Y. ; Hossain, A. ; Kim, K. ; Horace, J. ; McCall, B. ; Gul, R. ; Xu, L. ; Kopach, O. V. ; James, R. B. / Study on thermal annealing of cadmium zinc telluride (CZT) crystals. Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII. 2010. (Proceedings of SPIE - The International Society for Optical Engineering).

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AU - Cui, Y.

AU - Hossain, A.

AU - Kim, K.

AU - Horace, J.

AU - McCall, B.

AU - Gul, R.

AU - Xu, L.

AU - Kopach, O. V.

AU - James, R. B.

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AB - 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.

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