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Al0.2Ga0.8As X-ray photodiodes for X-ray spectroscopy

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posted on 2023-06-09, 03:37 authored by Michael WhitakerMichael Whitaker, Grammatiki LioliouGrammatiki Lioliou, Silvia Butera, Anna BarnettAnna Barnett
Three custom-made Al0.2Ga0.8As p-i-n mesa X-ray photodiodes (200 µm diameter, 3 µm i layer) were electrically characterised and investigated for their response to illumination with soft X-rays from an 55Fe radioisotope X-ray source (Mn Ka = 5.9 keV; Mn Kß = 6.49 keV). The AlGaAs photodiodes were shown to be suitable for photon counting X-ray spectroscopy at room temperature. When coupled to a custom-made low-noise charge-sensitive preamplifier, a mean energy resolution (as quantified by the full width at half maximum of the 5.9 keV photopeak) of 1.24 keV was measured at room temperature. Parameters such as the depletion width (1.92 µm at 10 V), charge trapping noise (61.7 e- rms ENC at 5 V, negligible at 10 V) and the electronic noise components (known dielectric noise (63.4 e- rms), series white noise (27.7 e- rms), parallel white noise (9.5 e- rms) and 1/f series noise (2.2 e- rms) at 10 V reverse bias) affecting the achieved energy resolution were computed. The estimated charge trapping noise and mean energy resolution were compared to similar materials (e.g. Al0.8Ga0.2As) previously reported, and discussed. These results are the first demonstration of photon counting X-ray spectroscopy with Al0.2Ga0.8As reported to date.

Funding

In situ X-ray Fluorescence Spectroscopy for Deep Sea Mining Applications; G1537; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/M004635/1

Royal Society; RS130515

High Efficiency Betavoltaic Cells; G1455; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/M002772/1

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

840

Page range

168-173

Department affiliated with

  • Engineering and Design Publications

Research groups affiliated with

  • Sensor Technology Research Centre Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2016-10-19

First Open Access (FOA) Date

2017-07-26

First Compliant Deposit (FCD) Date

2016-10-19

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