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RESEARCH PRODUCT

Spectroscopic response and charge transport properties of CdZnTe detectors grown by the vertical Bridgman technique

Natalia AuricchioNicola ZambelliA.a. TurturiciGiuseppe RasoGaetano GerardiA. ZappettiniEzio CaroliFabio PrincipatoG. BenassiLeonardo AbbeneS. Del Sordo

subject

Zinc tellurideRadiology Nuclear Medicine and ImagingMaterials sciencebusiness.industryInstrumentationDetectorSettore FIS/01 - Fisica SperimentaleElectrical engineeringTemperature measurementCathodePhoton countingSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)law.inventionAnodelawElectrodeCadmium alloysOptoelectronicsCadmium telluridePhotonicsbusinessInstrumentationNuclear and High Energy Physic

description

In this work, we present the results of spectroscopic investigations on CdZnTe (CZT) detectors grown by the boron oxide encapsulated vertical Bridgman technique (1MEM-CNR, Parma, Italy). The detectors, with different thicknesses (1 and 2.5 mm), are characterized by the same electrode layout (gold electroless contacts): the anode is a central electrode (2 x 2 mm(2)) surrounded by a guard-ring electrode, while the cathode is a planar electrode covering the detector surface (4.1 x 4.1 mm(2)). The results of electrical investigations point out the low leakage currents of these detectors even at high bias voltages: 38 nA/cm(2) (T = 25 degrees C) at 10000 V/cm. The time stability and the spectroscopic response of the detectors, at different temperatures and fluxes, were investigated. Am-241 spectra were measured up to 1 Mcps. The detectors were compared with the traveling heater method (THM) CZT grown detectors (Redlen), fabricated with the same electrode layout. These activities are in the framework of an Italian research project on the development of energy resolved photon counting (ERPC) systems for high flux energy resolved X-ray imaging.

yearjournalcountryeditionlanguage
2015-01-01
10.1109/nssmic.2015.7582269https://hdl.handle.net/10447/210756