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Sensors 2013, 13(2), 2447-2474; doi:10.3390/s130202447
Review

Progress in the Development of CdZnTe Unipolar Detectors for Different Anode Geometries and Data Corrections

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Received: 14 November 2012 / Revised: 25 January 2013 / Accepted: 5 February 2013 / Published: 18 February 2013
(This article belongs to the Section Physical Sensors)

Abstract

CdZnTe detectors have been under development for the past two decades, providing good stopping power for gamma rays, lightweight camera heads and improved energy resolution. However, the performance of this type of detector is limited primarily by incomplete charge collection problems resulting from charge carriers trapping. This paper is a review of the progress in the development of CdZnTe unipolar detectors with some data correction techniques for improving performance of the detectors. We will first briefly review the relevant theories. Thereafter, two aspects of the techniques for overcoming the hole trapping issue are summarized, including irradiation direction configuration and pulse shape correction methods. CdZnTe detectors of different geometries are discussed in detail, covering the principal of the electrode geometry design, the design and performance characteristics, some detector prototypes development and special correction techniques to improve the energy resolution. Finally, the state of art development of 3-D position sensing and Compton imaging technique are also discussed. Spectroscopic performance of CdZnTe semiconductor detector will be greatly improved even to approach the statistical limit on energy resolution with the combination of some of these techniques.
Keywords: hole trapping; weighting potential; Frisch grid; coplanar grid; strip electrode; 3-D position sensing; Compton imaging hole trapping; weighting potential; Frisch grid; coplanar grid; strip electrode; 3-D position sensing; Compton imaging
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Zhang, Q.; Zhang, C.; Lu, Y.; Yang, K.; Ren, Q. Progress in the Development of CdZnTe Unipolar Detectors for Different Anode Geometries and Data Corrections. Sensors 2013, 13, 2447-2474.

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