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Performance comparison of small-pixel CdZnTe radiation detectors with gold contacts formed by sputter and electroless deposition

Bell, S, Baker, Mark, Duarte, D, Schneider, A, Seller, P, Sellin, Paul, Veale, M and Wilson, M (2017) Performance comparison of small-pixel CdZnTe radiation detectors with gold contacts formed by sputter and electroless deposition Journal of Instrumentation, 12, P06015.

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Abstract

Recent improvements in the growth of wide-bandgap semiconductors, such as cadmium zinc telluride (CdZnTe or CZT), has enabled spectroscopic X/γ-ray imaging detectors to be developed. These detectors have applications covering homeland security, industrial analysis, space science and medical imaging. At the Rutherford Appleton Laboratory (RAL) a promising range of spectroscopic, position sensitive, small-pixel Cd(Zn)Te detectors have been developed. The challenge now is to improve the quality of metal contacts on CdZnTe in order to meet the demanding energy and spatial resolution requirements of these applications. The choice of metal deposition method and fabrication process are of fundamental importance. Presented is a comparison of two CdZnTe detectors with contacts formed by sputter and electroless deposition. The detectors were fabricated with a 74 × 74 array of 200 μm pixels on a 250 μm pitch and bump-bonded to the HEXITEC ASIC. The X/γ-ray emissions from an 241Am source were measured to form energy spectra for comparison. It was found that the detector with contacts formed by electroless deposition produced the best uniformity and energy resolution; the best pixel produced a FWHM of 560 eV at 59.54 keV and 50% of pixels produced a FWHM better than 1.7 keV . This compared with a FWHM of 1.5 keV for the best pixel and 50% of pixels better than 4.4 keV for the detector with sputtered contacts.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Bell, S
Baker, MarkM.Baker@surrey.ac.uk
Duarte, D
Schneider, A
Seller, P
Sellin, PaulP.Sellin@surrey.ac.uk
Veale, M
Wilson, M
Date : 26 June 2017
Funders : EPSRC
Identification Number : 10.1088/1748-0221/12/06/P06015
Copyright Disclaimer : © 2017 The Author(s). Published by IOP Publishing Ltd on behalf of Sissa Medialab. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence . Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Uncontrolled Keywords : Gamma detectors (scintillators, CZT, HPG, HgI etc); Hybrid detectors; Materials for solid-state detectors; X-ray detectors
Depositing User : Melanie Hughes
Date Deposited : 28 Feb 2018 08:49
Last Modified : 30 May 2018 10:56
URI: http://epubs.surrey.ac.uk/id/eprint/845909

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