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Mo/4H-SiC Schottky diodes for room temperature X-ray and γ-ray spectroscopy
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Lioliou, G., Renz, A. B., Shah, V. A., Gammon, P. M. and Barnett, A. M. (2022) Mo/4H-SiC Schottky diodes for room temperature X-ray and γ-ray spectroscopy. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1027 . 166330. doi:10.1016/j.nima.2022.166330 ISSN 0168-9002.
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Official URL: http://dx.doi.org/10.1016/j.nima.2022.166330
Abstract
Mo/4H-SiC Schottky diodes were investigated as detectors for their suitability in photon counting X-ray and -ray spectroscopy. The Schottky diodes, with a thick n epitaxial layer, were treated with a phosphorus pentoxide surface passivation, which had been previously shown to improve the homogeneity of the metal–semiconductor interface and suppress leakage current. One device was coupled to a low-noise charge sensitive preamplifier and standard onwards readout electronics; the resultant spectrometer was used to accumulated X-ray and -ray spectra. The spectrometer had an energy resolution of 1.67 keV 0.08 keV (97 e rms 5 e rms) at 5.9 keV and 1.6 keV 0.1 keV (93 e rms 6 e rms) at 59.54 keV. Despite the moderate energy resolution achieved, the results suggested that the leakage current of the Mo/4H-SiC Schottky diode detector was not the dominant source of noise limiting the energy resolution of the spectrometer at the optimum operating conditions at room temperature; lossy dielectrics in close proximity to the input of the preamplifier (including stray dielectrics) and the relatively large average electron–hole pair creation energy of 4H-SiC (an inherent property) were the main contributors to the achieved energy resolution in energy terms.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||
Journal or Publication Title: | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | ||||||||
Publisher: | Elsevier BV | ||||||||
ISSN: | 0168-9002 | ||||||||
Official Date: | 11 March 2022 | ||||||||
Dates: |
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Volume: | 1027 | ||||||||
Article Number: | 166330 | ||||||||
DOI: | 10.1016/j.nima.2022.166330 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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