AlGaAs two by two pixel detector for electron spectroscopy in space environments

Whitaker, M D C, Zhao, S, Lioliou, G, Butera, S and Barnett, A M (2019) AlGaAs two by two pixel detector for electron spectroscopy in space environments. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. a163039. ISSN 0168-9002

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Abstract

A prototype monolithic 2 × 2 square pixel Al0.2Ga0.8As p+
-i-n+mesa photodiode array (each photodiode of area 200 µm by 200 µm, with a 3 µm i layer) has been investigated for its utility as a detector for direct detection electron (β-particle) spectroscopy. Each photodiode was electrically characterised and its response to illumination from a 63Ni radioisotope β particle source was investigated at 20 °C. The percentage of electron energy absorbed in the active layer (i layer), Eabs, of the photodiode and the spectrum expected to be detected, were calculated via Monte Carlo simulations. Comparisons between the simulated and detected 63Ni β particle spectra are presented and demonstrate uniformity in response across the two by two pixel array. The percentage of electron energy absorbed in the active layer of the detector was at a maximum of 0.53 ± 0.04 for electrons with an energy of 38 keV; the percentage of electron energy absorbed in the active layer of the detector reduced to 0.29 ± 0.02 at 66 keV.

Item Type: Article
Additional Information: M.D.C.W. acknowledges funding received in the form of a PhD scholarship from University of Sussex, UK. A.M.B. acknowledges funding from the Leverhulme Trust, UK, in the form of a 2016 Philip Leverhulme Prize. The authors are grateful to B. Harrison, R. J. Airey, and S. Kumar at the EPSRC National Centre for III-V Technologies for material growth and fabrication.
Keywords: AlGaAs; Electron detector; Spectroscopy; Photodiode; Array; Semiconductor
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Research Centres and Groups: Space Research Group
Depositing User: Lucy Arnold
Date Deposited: 12 Nov 2019 09:45
Last Modified: 27 Nov 2019 12:15
URI: http://sro.sussex.ac.uk/id/eprint/87980

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