Chemical vapor deposition diamond based multilayered radiation detector: Physical analysis of detection properties

Almaviva, S.; Marinelli, M.; Milani, E.; Prestopino, G.; Tucciarone, A.; Verona, C.; Verona-Rinati, G.; Angelone, M.; Pillon, M.; Dolbnya, Igor P.; Sawhney, Kawal; Tartoni, N.

doi:10.1063/1.3275501

Cited by 83 publications

(87 citation statements)

References 16 publications

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“…The highly conductive boron doped diamond film acts as backing contact. The sensing volume of the detector is the depletion region that from the Schottky metal-diamond interface extends into the intrinsic diamond layer [1]. Such a sandwich geometry has been adopted to avoid any contribution to the response of the high quality, detector grade intrinsic CVD sensing layer coming from the HPHT diamond substrate, with no need to mechanically remove it.…”

Section: Methodsmentioning

confidence: 99%

“…Such detectors have been successfully utilized for the fabrication of high performance Schottky barrier (SB) particle detectors (alpha particles, neutrons) [6], photon detectors (vacuum UV, soft X rays) [1] and radiation therapy dosimeters [7].…”

Section: Diamond Based Multilayered Detectorsmentioning

confidence: 99%

“…Heavy boron incorporation induces metallic conduction in diamond. Boron-doped (Bdoped) diamond has attracted considerable attention for its application in the fabrication process of novel diamond based multilayered Schottky diode detectors for X-ray and ultraviolet radiation [1], alpha particles, thermal and fast neutrons [6] and radiation therapy dosimetry [7]. In this paper, a series of B-doped homoepitaxial diamond films have been analyzed by Raman spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

“…Diamond is an ideal material for the fabrication of compact solid-state ionizing radiation detectors [1]. Visibleblindness, chemical inertness, large heat conductance, high charge mobility and low dark current are the properties that make diamond particularly interesting for the realization of photodetectors [2,3].…”

Section: Introductionmentioning

confidence: 99%

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Raman scattering in boron-doped single-crystal diamond used to fabricate Schottky diode detectors

Faggio

Messina

Santangelo

et al. 2012

Journal of Quantitative Spectroscopy and Radiative Transfer

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a b s t r a c tThanks to its exceptional physical and electronic properties, diamond is an attractive material for electronic devices working at high temperature and in harsh chemical environment. Its use as a semiconducting material for electronics is related to the possibility of doping it in order to control its conductivity. Semiconducting p-type diamond films can be grown when boron is introduced into the film. In this work, boron-doped (B-doped) homoepitaxial diamond films are grown by Microwave Plasma Enhanced Chemical Vapor Deposition. Raman and electrical characterizations are carried out on the films as a function of boron doping level. As the boron content increases, we observe systematic modifications in the Raman spectra of single-crystal diamonds. A significant change in the lineshape of the first-order Raman peak, as well as a wide and structured signal at lower wavenumbers, appears simultaneously in samples grown with higher boron content. A single crystal diamond Schottky diode based on a metal/intrinsic/p-type diamond junction is analysed.

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Section: Methodsmentioning

confidence: 99%

Section: Diamond Based Multilayered Detectorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Raman scattering in boron-doped single-crystal diamond used to fabricate Schottky diode detectors

Faggio

Messina

Santangelo

et al. 2012

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…Details on device technology, detection mechanism, encapsulation technique and geometrical specifications can be found elsewhere [20,26]. Briefly, the device acts as a Schottky barrier photodiode and was operated in photovoltaic mode, i.e.…”

Section: Detectors and Measurement Setupmentioning

confidence: 99%

Dosimetric characterization of a synthetic single crystal diamond detector in a clinical 62 MeV ocular therapy proton beam

Marinelli¹,

Pompili²,

Prestopino³

et al. 2014

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tA synthetic single crystal diamond based Schottky photodiode was tested at INFN-LNS on the proton beam line (62 MeV) dedicated to the radiation treatment of ocular disease. The diamond detector response was studied in terms of pre-irradiation dose, linearity with dose and dose rate, and angular dependence. Depth dose curves were measured for the 62 MeV pristine proton beam and for three unmodulated range-shifted proton beams; furthermore, the spread-out Bragg peak was measured for a modulated therapeutic proton beam. Beam parameters, recommended by the ICRU report 78, were evaluated to analyze depth-dose curves from diamond detector. Measured dose distributions were compared with the corresponding dose distributions acquired with reference plane-parallel ionization chambers. Field size dependence of the output factor (dose per monitor unit) in a therapeutic modulated proton beam was measured with the diamond detector over the range of ocular proton therapy collimator diameters (5-30 mm). Output factors measured with the diamond detector were compared to the ones by a Markus ionization chamber, a Scanditronix Hi-p Si stereotactic diode and a radiochromic EBT2 film. Signal stability within 0.5% was demonstrated for the diamond detector with no need of any pre-irradiation dose. Dose and dose rate dependence of the diamond response was measured: deviations from linearity resulted to be within 70.5% over the investigated ranges of 0.5-40.0 Gy and 0.3-30.0 Gy/min respectively. Output factors from diamond detector measured with the smallest collimator (5 mm in diameter) showed a maximum deviation of about 3% with respect to the high resolution radiochromic EBT2 film. Depth-dose curves measured by diamond for unmodulated and modulated beams were in good agreement with those from the reference plane-parallel Markus chamber, with relative differences lower than 7 1% in peak-to-plateau ratios, well within experimental uncertainties. A 2.5% variation in diamond detector response was observed in angular dependence measurements carried-out by varying the proton beam incidence angle in the polar direction. The dosimetric characterization of the tested synthetic single crystal diamond detector clearly indicates its suitability for relative dosimetry in ocular therapy proton beams, with no need of any correction factors accounting for dose rate and linear energy transfer dependence.

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Evaluation of the PTW microDiamond in edge‐on orientation for dosimetry in small fields

Brace

Alhujaili

Paino

et al. 2020

J Applied Clin Med Phys

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Purpose: The PTW microDiamond has an enhanced spatial resolution when operated in an edge-on orientation but is not typically utilized in this orientation due to the specifications of the IAEA TRS-483 code of practice for small field dosimetry. In this work the suitability of an edge-on orientation and advantages over the recommended face-on orientation will be presented. Methods: The PTW microDiamond in both orientations was compared on a Varian TrueBeam linac for: machine output factor (OF), percentage depth dose (PDD), and beam profile measurements from 10 × 10 cm 2 to a 0.5 × 0.5 cm 2 field size for 6X and 6FFF beam energies in a water tank. A quantification of the stem effect was performed in edge-on orientation along with tissue to phantom ratio (TPR) measurements. An extensive angular dependence study for the two orientations was also undertaken within two custom PMMA plastic cylindrical phantoms. Results: The OF of the PTW microDiamond in both orientations agrees within 1% down to the 2 × 2 cm 2 field size. The edge-on orientation overresponds in the build-up region but provides improved penumbra and has a maximum observed stem effect of 1%. In the edge-on orientation there is an angular independent response with a maximum of 2% variation down to a 2 × 2 cm 2 field. The PTW microDiamond in edge-on orientation for TPR measurements agreed to the CC01 ionization chamber within 1% for all field sizes. Conclusions: The microDiamond was shown to be suitable for small field dosimetry when operated in edge-on orientation. When edge-on, a significantly reduced angular dependence is observed with no significant stem effect, making it a more versatile QA instrument for rotational delivery techniques.

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Chemical vapor deposition diamond based multilayered radiation detector: Physical analysis of detection properties

Cited by 83 publications

References 16 publications

Raman scattering in boron-doped single-crystal diamond used to fabricate Schottky diode detectors

Raman scattering in boron-doped single-crystal diamond used to fabricate Schottky diode detectors

Dosimetric characterization of a synthetic single crystal diamond detector in a clinical 62 MeV ocular therapy proton beam

Evaluation of the PTW microDiamond in edge‐on orientation for dosimetry in small fields

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