X-ray spectroscopy with an AlInP photodiode

Lioliou, G, Butera, S, Krysa, A B and Barnett, A M (2019) X-ray spectroscopy with an AlInP photodiode. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 943. a162467. ISSN 0168-9002

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A custom-made Al0.52In0.48P p+-i-n+ circular mesa X-ray photodiode (200 μm diameter; 2 μm i layer thickness) has been investigated for its use in photon counting X-ray spectroscopy within the energy range 4.95 keV to 21.17 keV. This the widest energy range so far used to characterise an AlInP X-ray detector. High-purity X-ray fluorescence calibration samples were excited by a Mo target X-ray tube to give characteristic energy photons with which to illuminate the detector. X-ray fluorescence spectra were accumulated with the Al0.52In0.48P X-ray detector coupled to a custom-made charge sensitive preamplifier (both operated at a temperature of 30 °C ± 2 °C). The charge output linearly increased with X-ray photon energy. The energy resolution (Full Width at Half Maximum, FWHM) degraded from 0.99 keV ± 0.02 keV (80 erms) at 4.95 keV to 1.12 keV ± 0.02 keV (89 erms) at 21.17 keV. The increase of the FWHM with increased energy exceeded the increase expected as a consequence of Fano noise. Hence, the presence of energy dependent incomplete charge collection noise was suggested. The count rate linearly increased with increasing incident X-ray flux across the investigated flux range, up to ~ 3.8 × 105 photons s-1 cm-2.

Item Type: Article
Additional Information: A.M.B. acknowledges funding from the Leverhulme Trust, United Kingdom, in the form of a 2016 Philip Leverhulme Prize. The authors are grateful to R. J. Airey and S. Kumar at the University of Sheffield EPSRC National Epitaxy Facility for device fabrication
Keywords: Aluminium Indium Phosphide; AlInP; X-ray spectroscopy; photodiode
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Research Centres and Groups: Space Research Group
Depositing User: Lucy Arnold
Date Deposited: 16 Aug 2019 10:26
Last Modified: 06 Aug 2020 01:00
URI: http://sro.sussex.ac.uk/id/eprint/85494

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Project NameSussex Project NumberFunderFunder Ref
Photon counting X-ray and gamma-ray spectroscopy with Al0.52In0.48P detectorsG2140EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCILEP/P021271/1