Development of new CdZnTe detectors for room-temperature high-flux radiation measurements

Recently, CdZnTe (CZT) detectors have been widely proposed and developed for room-temperature X-ray spectroscopy even at high fluxes, and great efforts have been made on both the device and the crystal growth technologies. In this work, the performance of new travelling-heater-method (THM)-grown CZT detectors, recently developed at IMEM-CNR Parma, Italy, is presented. Thick planar detectors (3   mm thick) with gold electroless contacts were realised, with a planar cathode covering the detector surface (4.1   mm × 4.1   mm) and a central anode (2   mm × 2   mm) surrounded by a guard-ring electrode. The detectors, characterized by low leakage currents at room temperature (4.7   nA   cm − 2 at 1000   V   cm − 1), allow good room-temperature operation even at high bias voltages (>7000   V   cm − 1). At low rates (200   counts   s − 1), the detectors exhibit an energy resolution around 4% FWHM at 59.5   keV (241Am source) up to 2200   V, by using commercial front-end electronics (A250F/NF charge-sensitive preamplifier, Amptek, USA; nominal equivalent noise charge of 100   electrons RMS). At high rates (1   Mcounts   s − 1), the detectors, coupled to a custom-designed digital pulse processing electronics developed at DiFC of University of Palermo (Italy), show low spectroscopic degradations: energy resolution values of 8% and 9.7% FWHM at 59.5   keV (241Am source) were measured, with throughputs of 0.4% and 60% at 1   Mcounts   ...
Source: Journal of Synchrotron Radiation - Category: Physics Authors: Tags: X-ray and γ -ray detectors CdZnTe detectors travelling heater method gold electroless contact high flux digital pulse shape analysis energy-resolved photon-counting detectors research papers Source Type: research
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