Journal
CRYSTALS
Volume 11, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/cryst11010010
Keywords
silicon carbide; radiation detector; radiation response; alpha particles; gamma radiation
Funding
- NATO SPS Program [G5674]
- National Collaborative Research Infrastructure Strategy (NCRIS) by the Australian Government
- European Regional Development Fund for the Center of Excellence for Advanced Materials and Sensing Devices, European Union's Horizon 2020 Research and Innovation Programme [KK.01.1.1.01.0001, 669014]
- European Union through the European Regional Development Fund-The Competitiveness and Cohesion Operational Programme [KK.01.1.06]
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The study showed that the newly designed 4H-SiC Schottky barrier diode detectors exhibit excellent response to alpha and gamma radiation, with a linear response to different alpha emitters and gamma sources within specific dose rates. It also demonstrated the radiation hardness of these detectors with negligible changes to their electrical properties and no creation of deep levels during testing.
We report the response of newly designed 4H-SiC Schottky barrier diode (SBD) detector prototype to alpha and gamma radiation. We studied detectors of three different active area sizes (1 x 1, 2 x 2 and 3 x 3 mm(2)), while all detectors had the same 4H-SiC epi-layer thickness of approximately mu m, sufficient to stop alpha particles up to 6.8 MeV, which have been used in this study. The detector response to the various alpha emitters in the 3.27 MeV to 8.79 MeV energy range clearly demonstrates the excellent linear response to alpha emissions of the detectors with the increasing active area. The detector response in gamma radiation field of Co-60 and Cs-137 sources showed a linear response to air kerma and to different air kerma rates as well, up to 4.49 Gy/h. The detector response is not in saturation for the dose rates lower than 15.3 mGy/min and that its measuring range for gamma radiation with energies of 662 keV, 1.17 MeV and 1.33 MeV is from 0.5 mGy/h-917 mGy/h. No changes to electrical properties of pristine and tested 4H-SiC SBD detectors, supported by a negligible change in carbon vacancy defect density and no creation of other deep levels, demonstrates the radiation hardness of these 4H-SiC detectors.
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