Performance of pixelated CZT detectors as a function of pixel and steering grid layout

CdZnTe (CZT) is a wide band-gap IIaVI semiconductor and can be used as detector for hard X-rays in astronomical instrumentation and for medical applications. Angular and energy resolutions, as well as detection efficiencies are crucial parameters to characterize the performance of CZT detectors. We...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2013-04, Vol.708, p.88-100
Main Authors: Beilicke, M., De Geronimo, G., Dowkontt, P., Garson, A., Guo, Q., Lee, K., Martin, J., Krawczynski, H.
Format: Article
Language:English
Subjects:
Accelerators
Cadmium zinc tellurides
CZT
Detectors
Energy resolution
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Pixels
Semiconductors
Steering
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Summary:CdZnTe (CZT) is a wide band-gap IIaVI semiconductor and can be used as detector for hard X-rays in astronomical instrumentation and for medical applications. Angular and energy resolutions, as well as detection efficiencies are crucial parameters to characterize the performance of CZT detectors. We studied the detector performance as a function of the geometrical layout of the anode pixel matrix for two 2A2cm2 CZT detectors with thicknesses of 2 mm and 5 mm, respectively. We varied the pixel sizes as well as their relative distances and quantified the energy resolutions and detection efficiencies. We also studied how a steering grid located between pixels affects the energy resolution and detection rate. The results of the study are presented and suggest that a steering grid substantially improves the high-energy performance of thin detectorsawhereas thick detectors mainly benefit from larger pixel widths.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2013.01.016