University of Surrey

Test tubes in the lab Research in the ATI Dance Research

A multi-technique characterization of electroless gold contacts on single crystal CdZnTe radiation detectors

Bell, SJ, Schneider, A, Seller, P, Veale, MC, Wilson, MD, Baker, MA, Perumal, V, Sellin, PJ, Chen, H and Marthandam, P (2013) A multi-technique characterization of electroless gold contacts on single crystal CdZnTe radiation detectors Journal of Physics D: Applied Physics, 46 (45).

[img] Text
Bell paper.pdf - ["content_typename_UNSPECIFIED" not defined]
Available under License : See the attached licence file.

Download (1MB)
[img]
Preview
PDF (licence)
SRI_deposit_agreement.pdf
Available under License : See the attached licence file.

Download (33kB) | Preview

Abstract

Cadmium zinc telluride (CdZnTe) is now established as a popular choice of sensor for the detection of γ-rays and hard x-rays, leading to its adoption in security, medical and scientific applications. There are still many technical challenges involving the deposition of high-quality, uniform metal contacts on CdZnTe. A detailed understanding of the interface between the bulk CdZnTe and the metal contacts is required for improvements to be made. To understand these complex interfaces, a range of complementary materials characterization techniques have been employed, including x-ray photoelectron spectroscopy depth profiling, focused ion beam cross section imaging and energy dispersive x-ray spectroscopy. In this paper a number of Redlen CdZnTe detectors with asymmetric anode/cathode contacts have been investigated. The structures of the contacts were imaged and their compositions identified. It was found that the two stage electroless indium/electroless gold deposition process on 'polished only' surfaces formed a complex heterojunction on the cathode, incorporating compounds of gold, gold-tellurium, tellurium oxide (of varying stoichiometry) and cadmium chloride up to depths of several 100 nm. Trace amounts of indium were found, in the form of an indium-gold compound, or possibly indium oxide. At the surface of the CdZnTe bulk, a thin Cd depleted layer was observed. The anode heterojunction, formed by a single stage electroless gold deposition, was thinner and exhibited a simpler structure of gold and tellurium oxide. The differing (asymmetric) nature of the anode/cathode contacts gave rise to asymmetric current-voltage (I-V) behaviour and spectroscopy. © 2013 IOP Publishing Ltd.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
AuthorsEmailORCID
Bell, SJUNSPECIFIEDUNSPECIFIED
Schneider, AUNSPECIFIEDUNSPECIFIED
Seller, PUNSPECIFIEDUNSPECIFIED
Veale, MCUNSPECIFIEDUNSPECIFIED
Wilson, MDUNSPECIFIEDUNSPECIFIED
Baker, MAUNSPECIFIEDUNSPECIFIED
Perumal, VUNSPECIFIEDUNSPECIFIED
Sellin, PJUNSPECIFIEDUNSPECIFIED
Chen, HUNSPECIFIEDUNSPECIFIED
Marthandam, PUNSPECIFIEDUNSPECIFIED
Date : 13 November 2013
Identification Number : 10.1088/0022-3727/46/45/455502
Additional Information : 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.
Depositing User : Symplectic Elements
Date Deposited : 16 Jan 2015 17:59
Last Modified : 17 Jan 2015 02:33
URI: http://epubs.surrey.ac.uk/id/eprint/805224

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800