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AlGaAs two by two pixel detector for electron spectroscopy in space environments
journal contribution
posted on 2023-06-09, 19:37 authored by Michael WhitakerMichael Whitaker, Shifan Zhao, Grammatiki LioliouGrammatiki Lioliou, Silvia Butera, Anna BarnettAnna BarnettA 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 (ß-particle) spectroscopy. Each photodiode was electrically characterised and its response to illumination from a 63Ni radioisotope ß 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 ß 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.
Funding
Radioisotope Microbatteries; G1951; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/P001815/1
In situ X-ray Fluorescence Spectroscopy for Deep Sea Mining Applications; G1537; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/M004635/1
Novel X-ray/[gamma]-ray Detectors; G2260; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/R001804/1
History
Publication status
- Published
File Version
- Accepted version
Journal
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated EquipmentISSN
0168-9002Publisher
ElsevierExternal DOI
Volume
951Article number
a163039Department affiliated with
- Engineering and Design Publications
Research groups affiliated with
- Space Research Group Publications
Notes
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.Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2019-11-12First Open Access (FOA) Date
2020-10-27First Compliant Deposit (FCD) Date
2019-11-11Usage metrics
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