GaN as a radiation hard particle detector

Grant, J. , Bates, R., Cunningham, W. , Blue, A. , Melone, J., McEwan, F., Vaitkus, J., Gaubas, E. and O'Shea, V. (2007) GaN as a radiation hard particle detector. Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, 576(1), pp. 60-65. (doi:10.1016/j.nima.2007.01.121)

Full text not currently available from Enlighten.

Abstract

Semiconductor tracking detectors at experiments such as ATLAS and LHCb at the CERN Large Hadron Collider (LHC) will be subjected to intense levels of radiation. The proposed machine upgrade, the Super-LHC (SLHC), to 10 times the initial luminosity of the LHC will require detectors that are ultra-radiation hard. Much of the current research into finding a detector that will meet the requirements of the SLHC has focused on using silicon substrates with enhanced levels of oxygen, for example Czochralski silicon and diffusion oxygenated float zone silicon, and into novel detector structures such as 3D devices. Another avenue currently being investigated is the use of wide band gap semiconductors such as silicon carbide (SiC) and gallium nitride (GaN). Both SiC and GaN should be intrinsically more radiation hard than silicon. Pad and guard ring structures were fabricated on three epitaxial GaN wafers. The epitaxial GaN thickness was either 2.5 or View the MathML source and the fabricated detectors were irradiated to various fluences with View the MathML source protons and 1 MeV neutrons. Detectors were characterised pre- and post-irradiation by performing current–voltage (I–V) and charge collection efficiency (CCE) measurements. Devices fabricated on View the MathML source epitaxial GaN irradiated to fluences of View the MathML source and View the MathML source show maximum CCE values of 26% and 20%, respectively, compared to a maximum CCE of 53% of the unirradiated device.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:O'Shea, Professor Val and Melone, Mr John and Grant, Dr James and Vaitkus, Prof Juozas and Blue, Dr Andrew and Cunningham, Dr Liam and Grant, Mrs Fiona and Bates, Dr Richard
Authors: Grant, J., Bates, R., Cunningham, W., Blue, A., Melone, J., McEwan, F., Vaitkus, J., Gaubas, E., and O'Shea, V.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
ISSN:0168-9002
ISSN (Online):1872-9576
Published Online:04 February 2007

University Staff: Request a correction | Enlighten Editors: Update this record