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Investigation optimal contact geometry for CdZnTe pixel detectors

Bolotnikov, Aleksey E. and Boggs, Steven E. and Chen, C. M. Hubert and Cook, Walter R. and Harrison, Fiona A. and Schindler, Steven M. (2000) Investigation optimal contact geometry for CdZnTe pixel detectors. In: Hard X-Ray, Gamma-Ray, and Neutron Detector Physics II. Proceedings of SPIE. No.4141. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 243-252. ISBN 0-8194-3786-7.

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We are developing CdZnTe pixel detectors for use as focal plane sensors in astronomical hard X-ray telescopes. To optimize the spectral response and imaging performance, we are investigating the effect of contact geometry on charge collection. Specifically, we have studied contact designs with orthogonal thin strips placed between pixel contacts. We apply a negative bias on the grid with respect to the pixel potential to force charge to drift toward the contacts. The grid bias is selected to be just sufficient to avoid charge collection on the grid, while increasing the transverse electric field on the surface between contacts. In contrast to focusing electrodes designed to force field lines to terminate on the pixel contact, our approach allows us to overcome the effects of charge loss between the pixels without significant increase of the leakage current, improving the overall energy resolution of the detector. In this paper we describe the performance of a CdZnTe pixel detector containing a grid electrode, bonded to a custom low-noise VLSI readout. We discuss the advantages of this type of detector for high spectral resolution applications.

Item Type:Book Section
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URLURL TypeDescription
Boggs, Steven E.0000-0001-9567-4224
Harrison, Fiona A.0000-0003-2992-8024
Alternate Title:Optimal contact geometry for CdZnTe pixel detectors
Additional Information:© 2000 Society of Photo-Optical Instrumentation Engineers (SPIE). The authors wish to thank B. Kecman, J.A. Burnham and B. Matthews from CIT, and M. Fitzsimmons from JPL for helping to fabricate CZT detectors.
Group:Space Radiation Laboratory
Subject Keywords:X-ray astrophysics —CdZnTe pixel detectors
Series Name:Proceedings of SPIE
Issue or Number:4141
Record Number:CaltechAUTHORS:20180111-110139675
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Official Citation:Aleksey E. Bolotnikov, Steven E. Boggs, C. M. Hubert Chen, Walter R. Cook, Fiona A. Harrison, Steven M. Schindler, "Optimal contact geometry for CdZnTe pixel detectors", Proc. SPIE 4141, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics II, (21 November 2000); doi: 10.1117/12.407587
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84253
Deposited By: Ruth Sustaita
Deposited On:11 Jan 2018 21:06
Last Modified:15 Nov 2021 20:18

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