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

Journal of Synchrotron Radiation
Leonardo AbbeneAndrea Zappettini

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.

References

Jul 3, 1995·Physical Review Letters·H H BarrettH B Barber
Nov 19, 2009·IEEE Transactions on Nuclear Science·Jan S IwanczykJan C Wessel
Jun 28, 2012·Journal of Instrumentation : an IOP and SISSA Journal·P SellerM C Veale
May 6, 2015·Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment·W C BarberJ S Iwanczyk
Aug 21, 2015·Journal of Synchrotron Radiation·Leonardo Abbene, Gaetano Gerardi
Jul 7, 2018·Journal of Synchrotron Radiation·Leonardo AbbeneAndrea Zappettini

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Citations

Sep 3, 2020·Journal of Synchrotron Radiation·Antonino ButtacavoliLeonardo Abbene
Nov 5, 2020·Journal of Synchrotron Radiation·Leonardo AbbeneEzio Caroli
May 1, 2021·Sensors·Stergios TsigaridasAndrea Zappettini

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