Effect of twin boundaries on the spectroscopic performance of CdZnTe detectors

Bradford H. Parker; Carl Michael Stahle; Don J. Roth; R. Sachidananda Babu; Jack Tueller

doi:10.1117/12.450743

18 December 2001 Effect of twin boundaries on the spectroscopic performance of CdZnTe detectors

Bradford H. Parker, Carl Michael Stahle, Don J. Roth, R. Sachidananda Babu, Jack Tueller

Proceedings Volume 4507, Hard X-Ray and Gamma-Ray Detector Physics III; (2001) https://doi.org/10.1117/12.450743
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

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.

Citation Download Citation

Bradford H. Parker, Carl Michael Stahle, Don J. Roth, R. Sachidananda Babu, and Jack Tueller "Effect of twin boundaries on the spectroscopic performance of CdZnTe detectors", Proc. SPIE 4507, Hard X-Ray and Gamma-Ray Detector Physics III, (18 December 2001); https://doi.org/10.1117/12.450743

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