0000000000084206

AUTHOR

Davide Calestani

showing 4 related works from this author

Mechanically stable metal layers for ohmic and blocking contacts on CdZnTe detectors by electroless deposition

2015

CdZnTe detectors are commonly exploited for the detection of gamma rays. However, obtaining mechanical stable, low noise contacts on CdZnTe is still an issue. In particular, ohmic contacts would be preferable for high flux applications. In this work, we show that it is possible to obtain mechanical stable gold contacts by electroless deposition in methanol solution. Moreover, we show that electroless deposited nickel contacts are also mechanical stable and are good candidates for the realization of ohmic contacts on high resistivity CdZnTe crystals.

Radiology Nuclear Medicine and ImagingMaterials scienceContactschemistry.chemical_elementElectroless depositionCrystalsMetalNickelOhmic contactAnodesInstrumentationNuclear and High Energy Physicbusiness.industryBlocking (radio)MethanolMetallurgyDetectorSettore FIS/01 - Fisica SperimentaleDetectorsSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)AnodeLow noiseNickelchemistryvisual_artvisual_art.visual_art_mediumOptoelectronicsGoldbusiness
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Electrical properties of Au/CdZnTe/Au detectors grown by the boron oxide encapsulated Vertical Bridgman technique

2016

Abstract In this work we report on the results of electrical characterization of new CdZnTe detectors grown by the Boron oxide encapsulated Vertical Bridgman technique (B-VB), currently produced at IMEM-CNR (Parma, Italy). The detectors, with gold electroless contacts, have different thicknesses (1 and 2.5 mm) and the same electrode layout, characterized by a central anode surrounded by a guard-ring electrode. Investigations on the charge transport mechanisms and the electrical contact properties, through the modeling of the measured current–voltage ( I – V ) curves, were performed. Generally, the detectors are characterized by low leakage currents at high bias voltages even at room tempera…

Nuclear and High Energy PhysicsTraveling heater method electrical propertie02 engineering and technology01 natural sciencesBoron oxide encapsulated Vertical Bridgman techniqueTraveling heater methodElectrical resistivity and conductivity0103 physical sciencesInstrumentationDeposition (law)010302 applied physicsPhysicsInterfacial layer-thermionic-diffusionbusiness.industryCdZnTe detectorsCdZnTe detectorSettore FIS/01 - Fisica SperimentaleBiasing021001 nanoscience & nanotechnologySettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)Electrical contactsAnodeBoron oxideelectrical propertiesElectrodeOptoelectronics0210 nano-technologybusinessVoltageNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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Optimization of quasi-hemispherical CdZnTe detectors by means of first principles simulation

2023

AbstractIn this paper we present the development of quasi-hemispherical gamma-ray detectors based on CdZnTe. Among the possible single-polarity electrode configurations, such as coplanar, pixelated, or virtual Frisch-grid geometries, quasi-hemispherical detectors are the most cost-effective alternative with comparable raw energy resolution in the high and low energy range. The optimal configuration of the sensor in terms of dimension of the crystals and electrode specifications has been first determined by simulations, and successively validated with experimental measures. Spectra from different sources have been acquired to evaluate the detectors performances. Three types of detectors with…

MultidisciplinaryCdZnTe detectorSettore FIS/01 - Fisica SperimentaleX-ray spectroscopyGamma ray spectroscopysemiconductor detectorSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)
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Charge carrier transport mechanisms in CdZnTe detectors grown by the vertical Bridgman technique

2016

In this work, we report on the results of electrical characterization of CdZnTe (CZT) detectors, with gold electroless contacts, grown by the boron oxide encapsulated vertical Bridgman technique (B-VB), currently produced at IMEM-CNR (Parma, Italy). The detectors, with different thicknesses (1 and 2.5 mm), have the same electrode layout: the anode is a central electrode (2 x 2 mm(2)) surrounded by a guard ring electrode. The cathode is a planar electrode covering the detector surface (4.1 x 4.1 mm(2)). Current-voltage (I-V) characteristics were measured at different temperatures in order to study the charge transport and the electrical properties. These detectors were compared with the trav…

Radiology Nuclear Medicine and ImagingMaterials sciencebusiness.industryDetectorSettore FIS/01 - Fisica SperimentaleBiasingCathodePhoton countingSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)Anodelaw.inventionDetectors; Crystals; Conductivity; Temperature measurement; Leakage currents; Surface treatment; TemperaturelawElectrodeOptoelectronicsCharge carrierbusinessInstrumentationVoltageNuclear and High Energy Physic
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