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Al0.2Ga0.8As 2 × 2 square pixel X-ray photodiode array
Version 2 2023-06-12, 07:22
Version 1 2023-06-09, 13:25
journal contribution
posted on 2023-06-12, 07:22 authored by Michael WhitakerMichael Whitaker, Grammatiki LioliouGrammatiki Lioliou, Anna BarnettAnna BarnettA monolithic 2 × 2 square pixel Al0.2Ga0.8As p+-i-n+ mesa X-ray photodiode array (each photodiode area 200 µm by 200 µm, 3 µm i layer) has been fabricated from material grown by MOVPE. The array was electrically characterised across the temperature range 100 °C to -20 °C. Each pixel’s response to illumination with soft X rays from an 55Fe radioisotope X-ray source (Mn Ka = 5.9 keV; Mn Kß = 6.49 keV) was investigated across the temperature range 30 °C to -20 °C. The best energy resolution (FWHM at 5.9 keV) achieved at 20 °C was 0.76 keV ± 0.06 keV (with 30 V reverse bias applied to the detector). The measured energy resolution is the best so far reported for AlGaAs X-ray photodiodes at 20 °C. It is also the first time a small AlGaAs X-ray photodiode array has been demonstrated. Due to the temperature tolerance and the radiation hardness of AlGaAs, such detectors are expected to find utility in future space science missions exposed to intense radiation environments, for example missions to study the Jovian or Saturnian aurorae and high temperature planetary surfaces.
Funding
In situ X-ray Fluorescence Spectroscopy for Deep Sea Mining Applications; G1537; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/M004635/1
Radioisotope Microbatteries; G1951; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/P001815/1
History
Publication status
- Published
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- Published version
Journal
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated EquipmentISSN
0168-9002Publisher
ElsevierExternal DOI
Volume
899Page range
106-114Department affiliated with
- Engineering and Design Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2018-05-22First Open Access (FOA) Date
2018-05-22First Compliant Deposit (FCD) Date
2018-05-22Usage metrics
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