Non-uniformity effects in CdZnTe coplanar-grid detectors

We discuss the findings from our studies of the performance of commercial coplanar‐grid CdZnTe detectors. The devices were investigated using a highly collimated X‐ray beam available at Brookhaven's National Synchrotron Light Source, and by applying pulse‐shape analysis to measure correlations...

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Bibliographic Details
Published in:Physica Status Solidi (b) 2007-05, Vol.244 (5), p.1589-1601
Main Authors: Carini, G. A., Bolotnikov, A. E., Camarda, G. C., Wright, G. W., James, R. B.
Format: Article
Language:English
Subjects:
29.40.Wk
73.61.Ga
Exact sciences and technology
General equipment and techniques
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Physics
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Summary:We discuss the findings from our studies of the performance of commercial coplanar‐grid CdZnTe detectors. The devices were investigated using a highly collimated X‐ray beam available at Brookhaven's National Synchrotron Light Source, and by applying pulse‐shape analysis to measure correlations between the signals read out from the devices. Although the operational principle of coplanar‐grid (CPG) detectors is well known, we found some important new details that help to better clarify the performance limitations of this type of device. The correlation plots we present can also be used as diagnostic tools to characterize the behavior of the CPG devices and to help to improve the designs of electrodes. This work illustrates the typical limitations related to the geometry of the contacts in CPG devices and how material non‐uniformities can amplify these problems. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
ISSN:0370-1972
1521-3951
DOI:10.1002/pssb.200675103