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Proceedings Paper

Effects of the networks of subgrain boundaries on spectral responses of thick CdZnTe detectors
Author(s): A. E. Bolotnikov; J. Butcher; G. S. Camarda; Y. Cui; S. U. Egarievwe; P. M. Fochuk; R. Gul; M. Hamade; A. Hossain; K. Kim; O. V. Kopach; M. Petryk; B. Raghothamachar; G. Yang; R. B. James
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Paper Abstract

CdZnTe (CZT) crystals used for nuclear-radiation detectors often contain high concentrations of subgrain boundaries and networks of poligonized dislocations that can significantly degrade the performance of semiconductor devices. These defects exist in all commercial CZT materials, regardless of their growth techniques and their vendor. We describe our new results from examining such detectors using IR transmission microscopy and white X-ray beam diffraction topography. We emphasize the roles on the devices' performances of networks of subgrain boundaries with low dislocation densities, such as poligonized dislocations and mosaic structures. Specifically, we evaluated their effects on the gamma-ray responses of thick, >10 mm, CZT detectors. Our findings set the lower limit on the energy resolution of CZT detectors containing dense networks of subgrain boundaries and walls of dislocations.

Paper Details

Date Published: 22 September 2011
PDF: 6 pages
Proc. SPIE 8142, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIII, 814206 (22 September 2011); doi: 10.1117/12.896223
Show Author Affiliations
A. E. Bolotnikov, Brookhaven National Lab. (United States)
J. Butcher, Brookhaven National Lab. (United States)
G. S. Camarda, Brookhaven National Lab. (United States)
Y. Cui, Brookhaven National Lab. (United States)
S. U. Egarievwe, Alabama A&M Univ. (United States)
P. M. Fochuk, Yuriy Fedkovych Chernivtsi National Univ. (Ukraine)
R. Gul, Brookhaven National Lab. (United States)
M. Hamade, Brookhaven National Lab. (United States)
A. Hossain, Brookhaven National Lab. (United States)
K. Kim, Brookhaven National Lab. (United States)
O. V. Kopach, Yuriy Fedkovych Chernivtsi National Univ. (Ukraine)
M. Petryk, Brookhaven National Lab. (United States)
B. Raghothamachar, Stony Brook Univ. (United States)
G. Yang, Brookhaven National Lab. (United States)
R. B. James, Brookhaven National Lab. (United States)

Published in SPIE Proceedings Vol. 8142:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIII
Larry A. Franks; Ralph B. James; Arnold Burger, Editor(s)

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