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Temperature characterisation of spectroscopic InGaP X-ray photodiodes

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posted on 2023-06-09, 15:08 authored by Silvia Butera, Grammatiki LioliouGrammatiki Lioliou, A B Krysa, Anna BarnettAnna Barnett
In this paper for the first time, an InGaP photodiode was used in a high temperature tolerant X-ray spectrometer. The use of InGaP in X-ray spectrometers shows a significant advance within this field allowing operation up to 100 °C. Such results are particularly important since GaP and InP (the InGaP binary parent compounds) are not spectroscopic even at room temperature. The best energy resolution (smallest FWHM) at 5.9 keV for the InGaP spectrometer was 1.27 keV at 100 °C and 770 eV at 20 °C, when the detector was reverse biased at 5 V. The observed FWHM were higher than the expected statistically limited energy resolutions indicating that other sources of noise contributed to the FWHM broadening. The spectrometer’s Si preamplifier electronics was the limiting factor for the FWHM rather than the InGaP photodiode itself. The InGaP electron-hole pair creation energy (eInGaP) was experimentally measured across the temperature range 100 °C to 20 °C. eInGaP was 4.94 eV ± 0.06 eV at 20 °C.

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

  • Accepted version

Journal

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

ISSN

0168-9002

Publisher

Elsevier

Volume

908

Page range

277-284

Department affiliated with

  • Engineering and Design Publications

Research groups affiliated with

  • Space Research Group Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-09-19

First Open Access (FOA) Date

2019-08-22

First Compliant Deposit (FCD) Date

2018-09-19

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