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Al0.2Ga0.8As 2 × 2 square pixel X-ray photodiode array

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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 Barnett
A 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

File Version

  • Published version

Journal

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment

ISSN

0168-9002

Publisher

Elsevier

Volume

899

Page range

106-114

Department affiliated with

  • Engineering and Design Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-05-22

First Open Access (FOA) Date

2018-05-22

First Compliant Deposit (FCD) Date

2018-05-22

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