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Progress in the Development of CdZnTe Unipolar Detectors for Different Anode Geometries and Data Corrections
Department of Biomedicine and Engineering, Peking University, No. 5, Yiheyuan Road, Beijing 100871, China
Department of Control Technology and Instrument, Hebei University, No. 180, Wusi East Road, Baoding 071000, China
* Authors to whom correspondence should be addressed.
Received: 14 November 2012; in revised form: 25 January 2013 / Accepted: 5 February 2013 / Published: 18 February 2013
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
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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.
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(2):2447-2474.
Zhang, Qiushi; Zhang, Congzhe; Lu, Yanye; Yang, Kun; Ren, Qiushi. 2013. "Progress in the Development of CdZnTe Unipolar Detectors for Different Anode Geometries and Data Corrections." Sensors 13, no. 2: 2447-2474.