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AlInP X-ray photodiodes without incomplete charge collection noise

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Version 2 2023-06-12, 09:23
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journal contribution
posted on 2023-06-12, 09:23 authored by Shifan Zhao, Grammatiki LioliouGrammatiki Lioliou, Silvia Butera, A B Krysa, Anna BarnettAnna Barnett
Previously, an Al0.52In0.48P p+-i-n+ spectroscopic photon counting X-ray photodiode with 2 µm thick i layer (200 µm diameter) was shown to suffer from energy-dependent incomplete charge collection noise [Lioliou et al., 2019, Nucl. Instr. and Meth. A Vol. 943, Art. No. 162467]. Subsequent measurements on a larger (400 µm diameter) Al0.52In0.48P p+ -i-n+ photodiode (reported here) revealed the presence of even greater incomplete charge collection noise. Given these findings, an expectation would have been that thicker Al0.52In0.48P structures (which would be required for efficient absorption of all but the softest X-rays) would have a greater incomplete charge collection noise contribution, thus suggesting that thick Al0.52In0.48P photodiodes may be of limited practicality as high performance detectors for photon counting X-ray spectroscopy. However, two new Al0.52In0.48P p+ -i-n+ photodiodes (with 6 µm i layers) were fabricated from material grown by the same technique (metalorganic vapour phase epitaxy) in the same reactor, and are now shown here to exhibit no signs of detectable incomplete charge collection noise under the illumination of X-ray photons of energy 4.95 keV to 21.17 keV. As such, now that greater experience has been built with Al0.52In0.48P, concerns about incomplete charge collection noise in X-ray detectors made from the material appear to have been unwarranted; the path towards thick Al0.52In0.48P X-ray detectors is now clear.

Funding

Novel X-ray/[gamma]-ray Detectors; G2260; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/R001804/1

Photon counting X-ray and gamma-ray spectroscopy with Al0.52In0.48P detectors; G2140; EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCIL; EP/P021271/1

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

960

Article number

a163606

Department affiliated with

  • Engineering and Design Publications

Research groups affiliated with

  • Space Research Group Publications

Notes

This work was supported by the Engineering and Physical Sciences Research Council, UK, via grant EP/P021271/1 (University of Sussex, A.M.B., PI) and in part by the Science and Technology Facilities Council, UK, via grants ST/P001815/1 and ST/R001804/1 (University of Sussex, A.M.B.,PI). A.M.B acknowledges funding received from The Leverhulme Trust, UK, in the form of a 2016 Philip Leverhulme Prize. The authors are grateful to R.J. Airey and S. Kumar at the EPSRC National Epitaxy Facility for device fabrication.

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2020-03-03

First Open Access (FOA) Date

2020-03-03

First Compliant Deposit (FCD) Date

2020-02-27

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