Wide Bandgap Semiconductor Radiation Detectors for Medical Applications
A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D1: Semiconductor Devices".
Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 378
Special Issue Editor
Interests: wide bandgap semiconductors; radiation detectors; dosimetry and microdosimetry; FLASH therapy; harsh environments
Special Issues, Collections and Topics in MDPI journals
Special Issue Information
Dear Colleagues,
Wide bandgap semiconductors such as SiC offer reduced leakage current when compared to silicon, which maintains low noise levels even at high temperatures and after irradiation at high fluences. Recent technological improvements, driven mainly by the power devices industry, in the production of the SiC materials offer the possibility of using thick substrates and fabricating structures with small pitch electrodes on large active detection surfaces. This allows the fabrication of innovative radiation detectors in SiC that will be the only detectors capable of withstanding harsh environmental conditions (e.g., high temperature and high radiation doses).
The wide SiC bandgap significantly reduces the rate of thermally generated charge carriers, reducing the leakage current and the noise level. This also makes SiC essentially insensitive to visible light and temperature variations. SiC also has a higher displacement energy threshold, and thus a higher radiation hardness than silicon, and also has a higher thermal conductivity which makes it more resistant to thermal shocks.
Another advantage of SiC is its lower sensitivity for mm3 sensing volume and deposited mGy when compared to silicon; this makes it an interesting choice for applications where a signal which is too large might saturate the semiconductor, as in FLASH dosimetry.
At present, the large use of SiC in power devices for electric vehicles has pushed the quality of this material to levels similar to silicon, and 150 mm wafers are a standard in the semiconductor industry.
Dr. Giulio Pellegrini
Guest Editor
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Keywords
- medical engineering
- physics
- FLASH therapy
- dosimetry
- radiation detectors
