Lateral IBIC characterization of single crystal synthetic diamond detectors

Giudice, A. Lo; Olivero, P.; Manfredotti, C.; Marinelli, M.; Picollo, F.; Prestopino, G.; Re, Alessandro; Rigato, V.; Verona, C.; Vittone, E.

doi:10.1002/pssr.201004488

Cited by 10 publications

(7 citation statements)

References 23 publications

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“…Therefore both drift and diffusion contribution to the current due to photogenerated carriers must be taken into account. Previous results 11,26 show that the diffusion length L is about 2.6 lm. This value is added to the depletion layer thickness calculated from the C-V curves to evaluate the effective thickness of the active diamond layer of XR-PDs.…”

Section: B Soft X-ray Characterizationmentioning

confidence: 88%

Influence of the metallic contact in extreme-ultraviolet and soft x-ray diamond based Schottky photodiodes

Ciancaglioni

Venanzio

Marinelli

et al. 2011

Journal of Applied Physics

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X-ray and UV photovoltaic Schottky photodiodes based on single crystal diamond were recently developed at Rome “Tor Vergata” University laboratories. In this work, different rectifying metallic contact materials were thermally evaporated on the oxidized surface of intrinsic single crystal diamond grown by chemical vapor deposition. Their impact on the detection performance in the extreme UV and soft x-ray spectral regions was studied. The electrical characterization of the metal/diamond Schottky junctions was performed at room temperature by measuring the capacitance–voltage characteristics. The diamond photodiodes were then tested both over the extreme UV spectral region from 10 to 60 eV by using He-Ne DC gas discharge as a radiation source and toroidal vacuum monochromator, and in the soft x-ray range from 6 to 20 keV at the Diamond Light Source synchrotron x-ray beam-line in Harwell (UK). In both experimental setups, time response and spectral responsivity were analyzed for all the investigated Schottky contact materials. A good agreement between the experimental data and theoretical results from Monte Carlo simulations is found

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Section: B Soft X-ray Characterizationmentioning

confidence: 88%

Influence of the metallic contact in extreme-ultraviolet and soft x-ray diamond based Schottky photodiodes

Ciancaglioni

Venanzio

Marinelli

et al. 2011

Journal of Applied Physics

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“…Both the width and the gap between the electrodes were 10 µm, in order to provide an equivalent sample for direct comparison with the performances of the 3D detector. In the following, this diamond planar detector In both devices, the metal contacts form a Schottky barrier with the CVD diamond surface [20,21], which has a typical effective acceptor concentration of the order of ~10 14 cm -3 , as reported in previous works [22,Ciancaglioni]. An I-V characteristic (not reported here) of the 3D detector showed a linear, symmetric behavior, reaching typical values of 1 pA at ±20 V. Due to the planar geometry of the Cr grooves, the observed trend was attributed to the reverse current associated with the presence of back-to-back Schottky contacts at the electrodes, preventing a direct polarization current flowing through the device.…”

Section: Methodsmentioning

confidence: 86%

A 3-dimensional interdigitated electrode geometry for the enhancement of charge collection efficiency in diamond detectors

Forneris¹,

Giudice²,

Olivero³

et al. 2014

EPL

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In this work, a single crystal CVD diamond film with a novel three-dimensional (3D) interdigitated electrode geometry has been fabricated with the Reactive Ion Etching (RIE) technique in order to increase the charge collection efficiency (CCE) with respect to that obtained by standard superficial electrodes. The geometrical arrangement of the electric field lines due to the 3D patterning of the electrodes results in a shorter travel path for the excess charge carriers, thus contributing to a more effici ent charge collection mechanism. The CCE of the device was mapped by means of the Ion Beam Induced Charge (IBIC) technique. A 1 MeV proton micro-beam was raster scanned over the active area of the diamond detector under different bias voltage conditions, enabling to probe mple surface. The experimental results, supported by the numerical simulations, show a significant improvement in the 3D-detector performance (i.e. CCE, energy resolution, extension of the active area) if compared with the results obtained by standard surface metallic electrodes.

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“…Figure 10A shows a schematic representation of the CVD diamond detector described. Characterisation by means of IBIC and lateral IBIC analysis showed a well defined SV and a 100% CCE in the sensitive region without any incomplete CCE regions and any charge collection outside of the SV, [99,100]. A variation of the fabrication technique has been recently studied by Verona et al [101].…”

Section: Diamond-based Microdosimetrymentioning

confidence: 99%

Microdosimetry for hadron therapy: A state of the art of detection technology

2022

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The interest in hadron therapy is growing fast thanks to the latest technological advances in accelerators and delivery technologies, to the development of more and more efficient and comprehensive treatment planning tools, and due to its increasing clinical adoption proving its efficacy. A precise and reliable beam quality assessment and an accurate and effective inclusion of the biological effectiveness of different radiation qualities are fundamental to exploit at best its advantages with respect to conventional radiotherapy. Currently, in clinical practice, the quality assurance (QA) is carried out by means of conventional dosimetry, while the biological effectiveness of the radiation is taken into account considering the Relative Biological Effectiveness (RBE). The RBE is considered a constant value for protons and it is estimated as a function of the absorbed dose in case of carbon ions. In this framework, microdosimetry could bring a significant improvement to both QA and RBE estimation. By measuring the energy deposited by the radiation into cellular or sub-cellular volumes, microdosimetry could provide a unique characterisation of the beam quality on one hand, and a direct link to radiobiology on the other. Different detectors have been developed for microdosimetry, from the more conventional tissue equivalent proportional counter (TEPC), silicon-based and diamond-based solid-state detectors, to ΔE-E telescope detectors, gas electrons multiplier (GEM), hybrid microdosimeters and a micro-bolometer based on Superconducting QUantum Interference Device (SQUID) technology. However, because of their different advantages and drawbacks, a standard device and an accredited experimental methodology have not been unequivocally identified yet. The establishment of accepted microdosimetry standard protocols and code of practice is needed before the technique could be employed in clinical practice. Hoping to help creating a solid ground on which future research, development and collaborations could be planned and inspired, a comprehensive state of the art of the detector technologies developed for microdosimetry is presented in this review, discussing their use in clinical hadron therapy conditions and considering their advantages and drawbacks.

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Lateral IBIC characterization of single crystal synthetic diamond detectors

Cited by 10 publications

References 23 publications

Influence of the metallic contact in extreme-ultraviolet and soft x-ray diamond based Schottky photodiodes

Influence of the metallic contact in extreme-ultraviolet and soft x-ray diamond based Schottky photodiodes

A 3-dimensional interdigitated electrode geometry for the enhancement of charge collection efficiency in diamond detectors

Microdosimetry for hadron therapy: A state of the art of detection technology

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