EVALUATION OF CDTE DETECTORS WITH SCHOTTKY CONTACTS FOR IMAGING APPLICATIONS

Citation
Kl. Giboni et E. Aprile, EVALUATION OF CDTE DETECTORS WITH SCHOTTKY CONTACTS FOR IMAGING APPLICATIONS, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 416(2-3), 1998, pp. 319-327
Citations number
8
Categorie Soggetti
Nuclear Sciences & Tecnology","Physics, Particles & Fields","Instument & Instrumentation",Spectroscopy
ISSN journal
01689002
Volume
416
Issue
2-3
Year of publication
1998
Pages
319 - 327
Database
ISI
SICI code
0168-9002(1998)416:2-3<319:EOCDWS>2.0.ZU;2-S
Abstract
A CdTe detector with Schottky contacts has been tested with special em phasis on the requirements for imaging arrays. The detector can withst and a much higher field strength than conventional CdTe detectors with two ohmic contacts. The higher field strength results in complete cha rge collection, including the holes which are a factor of 10 slower th an the electrons. With moderate cooling to - 20 degrees C and a field strength around 10 kV/cm, the detectors are homogeneous, i.e. the sign al response is independent of the interaction location of the gamma-ra ys. The measured spectra show symmetric full energy peaks with no tail ing to the low-energy side. Polarization effects at room temperature d isappear below 0 degrees C. The detectors are well suited for large im aging arrays in applications such as hard X-ray astrophysics and medic al imaging. (C) 1998 Elsevier Science B.V. All rights reserved.