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The X-ray detection performance of polycrystalline CVD diamond with pulsed laser deposited carbon electrodes

Abdel-Rahman, MAE, Lohstroh, A, Jayawardena, I and Henley, SJ (2012) The X-ray detection performance of polycrystalline CVD diamond with pulsed laser deposited carbon electrodes Diamond and Related Materials, 22. 70 - 76. ISSN 0925-9635

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Abstract

The deposition of amorphous carbon electrical contacts on a diamond radiation detector by Pulsed Laser Deposition (PLD) is introduced as a novel technique for producing tissue equivalent X-ray dosimeters. Three devices were fabricated with the following electrical contacts: pure amorphous carbon (labelled Poly-C), amorphous carbon mixed with Nickel (PLD) (labelled Poly-C/Ni) and conventional sputtered Pt (labelled Poly-Pt). To examine the performance of PLD carbon as a contact, a set of X-ray detection characteristics was studied and compared to those of Poly-Pt. This investigation includes current–voltage characteristics, linearity and dose rate dependence, sensitivity and specific sensitivity, photoconductive gain, stability, reproducibility and time response (rise and fall-off times). The experimental results suggest that Poly-C/Ni is suitable for an X-ray dosimeter. It shows a high signal to noise ratio (SNR) of ~ 3300, approximately linear relationship between the photocurrent and the dose rate and a sensitivity of 65 nC/Gy. In addition the current signal is stable and reproducible (within 0.26%) and the rise and fall-off times are less than 1.1 and 0.4 s, respectively.

Item Type: Article
Additional Information: NOTICE: This is the author’s version of a work that was accepted for publication in Diamond and Related Materials. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Diamond and Related Materials, 22, February 2012, DOI 10.1016/j.diamond.2011.12.017
Divisions: Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Nano-Electronics Centre
Depositing User: Symplectic Elements
Date Deposited: 26 Jul 2012 12:59
Last Modified: 23 Sep 2013 19:33
URI: http://epubs.surrey.ac.uk/id/eprint/712266

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