Incomplete Charge Collection at Inter-Pixel Gap in Low- and High-Flux Cadmium Zinc Telluride Pixel Detectors.

Autor: Buttacavoli A; Department of Physics and Chemistry (DiFC)-Emilio Segrè, University of Palermo, Viale Delle Scienze, Edificio 18, 90128 Palermo, Italy., Principato F; Department of Physics and Chemistry (DiFC)-Emilio Segrè, University of Palermo, Viale Delle Scienze, Edificio 18, 90128 Palermo, Italy., Gerardi G; Department of Physics and Chemistry (DiFC)-Emilio Segrè, University of Palermo, Viale Delle Scienze, Edificio 18, 90128 Palermo, Italy., Cascio D; Department of Physics and Chemistry (DiFC)-Emilio Segrè, University of Palermo, Viale Delle Scienze, Edificio 18, 90128 Palermo, Italy., Raso G; Department of Physics and Chemistry (DiFC)-Emilio Segrè, University of Palermo, Viale Delle Scienze, Edificio 18, 90128 Palermo, Italy., Bettelli M; IMEM/CNR, Parco Area delle Scienze 37/A, 43100 Parma, Italy., Zappettini A; IMEM/CNR, Parco Area delle Scienze 37/A, 43100 Parma, Italy., Seller P; Rutherford Appleton Laboratory, UKRI Science & Technology Facilities Council, Oxon OX11 0QX, UK., Veale MC; Rutherford Appleton Laboratory, UKRI Science & Technology Facilities Council, Oxon OX11 0QX, UK., Abbene L; Department of Physics and Chemistry (DiFC)-Emilio Segrè, University of Palermo, Viale Delle Scienze, Edificio 18, 90128 Palermo, Italy.
Jazyk: angličtina
Zdroj: Sensors (Basel, Switzerland) [Sensors (Basel)] 2022 Feb 13; Vol. 22 (4). Date of Electronic Publication: 2022 Feb 13.
DOI: 10.3390/s22041441
Abstrakt: The success of cadmium zinc telluride (CZT) detectors in room-temperature spectroscopic X-ray imaging is now widely accepted. The most common CZT detectors are characterized by enhanced-charge transport properties of electrons, with mobility-lifetime products μeτe > 10 -2 cm 2 /V and μhτh > 10 -5 cm 2 /V. These materials, typically termed low-flux LF-CZT, are successfully used for thick electron-sensing detectors and in low-flux conditions. Recently, new CZT materials with hole mobility-lifetime product enhancements (μhτh > 10 -4 cm 2 /V and μeτe > 10 -3 cm 2 /V) have been fabricated for high-flux measurements (high-flux HF-CZT detectors). In this work, we will present the performance and charge-sharing properties of sub-millimeter CZT pixel detectors based on LF-CZT and HF-CZT crystals. Experimental results from the measurement of energy spectra after charge-sharing addition (CSA) and from 2D X-ray mapping highlight the better charge-collection properties of HF-CZT detectors near the inter-pixel gaps. The successful mitigation of the effects of incomplete charge collection after CSA was also performed through original charge-sharing correction techniques. These activities exist in the framework of international collaboration on the development of energy-resolved X-ray scanners for medical applications and non-destructive testing in the food industry.
Databáze: MEDLINE
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