6533b852fe1ef96bd12aaf19

RESEARCH PRODUCT

Improved electroless platinum contacts on CdZnTe X- and γ-rays detectors

Maura PavesiManuele BettelliMarco VillaniAndrea SantiAndrea ZappettiniSilvia ZanettiniLeonardo AbbeneLucia NasiFabio PrincipatoNicola Sarzi Amadè

subject

0301 basic medicineMaterials for devicesMaterials sciencechemistry.chemical_elementlcsh:MedicineElectronCZT detectorELECTRIC-FIELD PROFILE;TRANSIENT-CURRENT;TRANSPORT-PROPERTIESPULSE-SHAPE;CDTE;PERFORMANCE;RESISTIVITY;DEPOSITION;BULKParticle detectorArticle03 medical and health sciences0302 clinical medicinePlanarlcsh:ScienceMultidisciplinarybusiness.industrySettore FIS/01 - Fisica SperimentaleDetectorlcsh:RCarrier lifetimeX-ray and gamma ray detectorSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)Electrical contactsMaterials scienceFull width at half maximum030104 developmental biologychemistrysemiconductor detectorOptoelectronicslcsh:QbusinessPlatinum030217 neurology & neurosurgery

description

AbstractPlatinum is a promising candidate for the realization of blocking electrical contacts on cadmium-zinc-telluride (CdZnTe or CZT) radiation detectors. However, the poor mechanical adhesion of this metal often shortens the lifetime of the final device. In this work, a simple and effective procedure to obtain robust platinum contacts by electroless deposition is presented. Microscopical analysis revealed the final thickness and composition of the contact layer and its adhesion to the bulk crystal. The blocking nature of the Pt-CdZnTe junction, essential to obtain low noise devices, was confirmed by current–voltage measurements. The planar Pt-CdZnTe-Pt detectors showed good room temperature spectroscopic performance with energy resolution of 4% (2.4 keV) and 3% (3.7 keV) FWHM at 59.5 and 122.1 keV, respectively. Finally, we showed, for the first time, that platinum contacts allow the estimation of the carrier lifetime and mobility of both holes and electrons by using current transient measurements. This demonstrated the optimal hole extraction capability of such contacts.

yearjournalcountryeditionlanguage
2020-08-13Scientific Reports
10.1038/s41598-020-70801-9http://link.springer.com/article/10.1038/s41598-020-70801-9