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Proceedings Paper

Effect of twin boundaries on the spectroscopic performance of CdZnTe detectors
Author(s): Bradford H. Parker; Carl Michael Stahle; Don J. Roth; R. Sachidananda Babu; Jack Tueller
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Paper Abstract

Most single grains in cadmium zinc telluride (CdZnTe) grown by the high-pressure Bridgman (HPB) technique contain multiple twin boundaries. As a consequence, twin boundaries are one of the most common macroscopic material defects found in large area (400 to 700 mm2) CdZnTe specimens obtained from HPB ingots. Due to the prevalence of twin boundaries, understanding their effect on detector performance is key to the material selection process. Twin boundaries in several 2 mm thick large area specimens were first documented using infrared transmission imaging. These specimens were then fabricated into either 2mm pixel or planar detectors in order to examine the effect of the twin boundaries on detector performance. Preliminary results show that twin boundaries, which are decorated with tellurium inclusions, produce a reduction in detector efficiency and a degradation in resolution. The extent of the degradation appears to be a function of the density of tellurium inclusions.

Paper Details

Date Published: 18 December 2001
PDF: 11 pages
Proc. SPIE 4507, Hard X-Ray and Gamma-Ray Detector Physics III, (18 December 2001); doi: 10.1117/12.450743
Show Author Affiliations
Bradford H. Parker, NASA Goddard Space Flight Ctr. (United States)
Carl Michael Stahle, NASA Goddard Space Flight Ctr. (United States)
Don J. Roth, NASA Glenn Research Ctr. (United States)
R. Sachidananda Babu, NASA Goddard Space Flight Ctr. (United States)
Jack Tueller, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 4507:
Hard X-Ray and Gamma-Ray Detector Physics III
Ralph B. James, Editor(s)

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