Room-temperature X-ray response of cadmium–zinc–telluride pixel detectors grown by the vertical Bridgman technique

DOI: 10.1107/S1600577519015996

Authors: Leonardo Abbene (University of Palermo) , Fabio Principato (University of Palermo) , Gaetano Gerardi (University of Palermo) , Antonino Buttacavoli (University of Palermo) , Donato Cascio (University of Palermo) , Manuele Bettelli (IMEM-CNR) , Nicola Sarzi Amade (IMEM-CNR) , Paul Seller (Rutherford Appleton Laboratory) , Matthew C. Veale (Rutherford Appleton Laboratory) , Oliver Fox (Diamond Light Source) , Kawal Sawhney (Diamond Light Source) , Silvia Zanettini (due2lab s.r.l.) , Elio Tomarchio (University of Palermo) , Andrea Zappettini (IMEM-CNR)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Synchrotron Radiation , VOL 27

State: Published (Approved)
Published: March 2020
Diamond Proposal Number(s): 20545

Abstract: In this work, the spectroscopic performances of new cadmium–zinc–telluride (CZT) pixel detectors recently developed at IMEM-CNR of Parma (Italy) are presented. Sub-millimetre arrays with pixel pitch less than 500 µm, based on boron oxide encapsulated vertical Bridgman grown CZT crystals, were fabricated. Excellent room-temperature performance characterizes the detectors even at high-bias-voltage operation (9000 V cm−1), with energy resolutions (FWHM) of 4% (0.9 keV), 1.7% (1 keV) and 1.3% (1.6 keV) at 22.1, 59.5 and 122.1 keV, respectively. Charge-sharing investigations were performed with both uncollimated and collimated synchrotron X-ray beams with particular attention to the mitigation of the charge losses at the inter-pixel gap region. High-rate measurements demonstrated the absence of high-flux radiation-induced polarization phenomena up to 2 × 106 photons mm−2 s−1. These activities are in the framework of an international collaboration on the development of energy-resolved photon-counting systems for high-flux energy-resolved X-ray imaging.

Journal Keywords: X-ray and gamma-ray detectors; CdZnTe pixel detectors; charge sharing; charge losses; spectroscopic X-ray imaging; vertical Bridgman technique

Subject Areas: Physics


Instruments: B16-Test Beamline

Added On: 04/02/2020 10:35

Discipline Tags:

Detectors Engineering & Technology

Technical Tags:

Imaging