A 3D diamond dosimeter with graphitic surface connections

Porter, A.; Kanxheri, K.; Paz, I. López; Oh, A.; Servoli, L.; Talamonti, C.

doi:10.1016/j.diamond.2023.109692

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…Depositing low resistive nitrogen incorporated ultrananocrystalline diamond (N-UNCD) layers on diamond can be used to provide ohmic contacts [65]. Parts of the diamond may be converted into ohmically conducting graphite by using a laser beam [66,67]. This phenomenon can be used in lieu of metallization to form conductive graphitic electrodes on diamond.…”

Section: Contact Formationmentioning

confidence: 99%

Thin film charged particle detectors

et al. 2023

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Silicon tracking detectors have grown to cover larger surface areas up to hundreds of square meters, and are even taking over other sub-detectors, such as calorimeters. However, further improvements in tracking detector performance are more likely to arise from the ability to make a low mass detector comprised of a high ratio of active sensor to inactive materials, where dead materials include electrical services, cooling, mechanical supports, etc. In addition, the cost and time to build these detectors is currently large. Therefore, advancements in the fundamental technology of tracking detectors may need to look at a more transformative approach that enables extremely large area coverage with minimal dead material and is easier and faster to build. The advancement of thin film fabrication techniques has the potential to revolutionize the next-to-next generation of particle detector experiments. Some thin film deposition techniques have already been developed and widely used in the industry to make LED screens for TVs and monitors. If large area thin film detectors on the order of several square meters can be fabricated with similar performance as current silicon technologies, they could be used in future particle physics experiments. This paper aims to review the key fundamental performance criteria of existing silicon detectors and past research to use thin films and other semi-conductor materials as particle detectors in order to explore the important considerations and challenges to pursue thin film detectors.

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Section: Contact Formationmentioning

confidence: 99%

Thin film charged particle detectors

et al. 2023

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“…Similarly, graphene layer implementation in Silicon Carbide by means of epitaxial growth has been studied 11 , which opens the possibility of fabricating metal-less radiation detection. Other approaches are being studied in parallel using carbon-based contacts to achieve metal-less dosimeters, in which diamond is used as the semiconductor material and graphite (typically introduced by laser graphitisation 12 ) as the conductive contact for medical dosimetry 13 . However, albeit diamond outperforms SiC in the thermal conductivity and radiation hardness in addition to being tissue-equivalent, SiC is more cost effective and available in larger areas.…”

Section: Introductionmentioning

confidence: 99%

First use of silicon carbide detectors with graphene-enhanced contacts for medical dosimetry

Lopez Paz,

Fleta,

Gomez

et al. 2024

Sci Rep

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Silicon Carbide (SiC) is a radiation hard wide bandgap semiconductor, which makes it an interesting alternative for radiation detector fabrication, with potential applications such as High Energy Physics, synchrotron and radiotherapy instrumentation. In addition, by reducing the amount of metal over the active area of said detectors (typically used for electrical connectivity with the implant of the pn-junction) unwanted effects from secondary interactions which can affect the accuracy of the measurement can be diminished, essential to meet the medical standards of precision. In this article, the use of epitaxially-grown graphene is explored as an alternative to metallic contacts with these prototypes. To this end, the first prototypes of SiC diodes with epitaxial graphene contacts were produced at IMB-CNM for radiation detection,along with reference devices. In order to characterise the feasibility of the technology in the medical application, the dose rate linearity of the SiC device with graphene was measured in a radiotherapy Linac in the dose rate range of 1–6 Gy/min. The response of the device was compared to that observed on devices with similar geometries reported elsewhere. To fully characterise the devices, the same exercise was repeated in a laboratory X-ray tube. Under the later set-up, the prototype is compared against a device with a fully metallised active region.

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