Incomplete Charge Collection at Inter-Pixel Gap in Low- and High-Flux Cadmium Zinc Telluride Pixel Detectors
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 cm /V and μhτh > 10 cm /...
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Published in | Sensors (Basel, Switzerland) Vol. 22; no. 4; p. 1441 |
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Abstract | 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
cm
/V and μhτh > 10
cm
/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
cm
/V and μeτe > 10
cm
/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. |
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AbstractList | 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. 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[sup.−2] cm[sup.2]/V and μhτh > 10[sup.−5] cm[sup.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[sup.−4] cm[sup.2]/V and μeτe > 10[sup.−3] cm[sup.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. 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 cm2/V and μhτh > 10−5 cm2/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 cm2/V and μeτe > 10−3 cm2/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. 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 cm /V and μhτh > 10 cm /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 cm /V and μeτe > 10 cm /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. |
Audience | Academic |
Author | Veale, Matthew C Abbene, Leonardo Seller, Paul Zappettini, Andrea Gerardi, Gaetano Principato, Fabio Buttacavoli, Antonino Bettelli, Manuele Cascio, Donato Raso, Giuseppe |
AuthorAffiliation | 2 IMEM/CNR, Parco Area delle Scienze 37/A, 43100 Parma, Italy; manuele.bettelli@imem.cnr.it (M.B.); andrea.zappettini@imem.cnr.it (A.Z.) 1 Department of Physics and Chemistry (DiFC)—Emilio Segrè, University of Palermo, Viale Delle Scienze, Edificio 18, 90128 Palermo, Italy; antonino.buttacavoli@unipa.it (A.B.); fabio.principato@unipa.it (F.P.); gaetano.gerardi@unipa.it (G.G.); donato.cascio@unipa.it (D.C.); giuseppe.raso@unipa.it (G.R.) 3 Rutherford Appleton Laboratory, UKRI Science & Technology Facilities Council, Oxon OX11 0QX, UK; paul.seller@stfc.ac.uk (P.S.); matthew.veale@stfc.ac.uk (M.C.V.) |
AuthorAffiliation_xml | – name: 2 IMEM/CNR, Parco Area delle Scienze 37/A, 43100 Parma, Italy; manuele.bettelli@imem.cnr.it (M.B.); andrea.zappettini@imem.cnr.it (A.Z.) – name: 3 Rutherford Appleton Laboratory, UKRI Science & Technology Facilities Council, Oxon OX11 0QX, UK; paul.seller@stfc.ac.uk (P.S.); matthew.veale@stfc.ac.uk (M.C.V.) – name: 1 Department of Physics and Chemistry (DiFC)—Emilio Segrè, University of Palermo, Viale Delle Scienze, Edificio 18, 90128 Palermo, Italy; antonino.buttacavoli@unipa.it (A.B.); fabio.principato@unipa.it (F.P.); gaetano.gerardi@unipa.it (G.G.); donato.cascio@unipa.it (D.C.); giuseppe.raso@unipa.it (G.R.) |
Author_xml | – sequence: 1 givenname: Antonino surname: Buttacavoli fullname: Buttacavoli, Antonino organization: Department of Physics and Chemistry (DiFC)-Emilio Segrè, University of Palermo, Viale Delle Scienze, Edificio 18, 90128 Palermo, Italy – sequence: 2 givenname: Fabio orcidid: 0000-0003-2787-0877 surname: Principato fullname: Principato, Fabio organization: Department of Physics and Chemistry (DiFC)-Emilio Segrè, University of Palermo, Viale Delle Scienze, Edificio 18, 90128 Palermo, Italy – sequence: 3 givenname: Gaetano surname: Gerardi fullname: Gerardi, Gaetano organization: Department of Physics and Chemistry (DiFC)-Emilio Segrè, University of Palermo, Viale Delle Scienze, Edificio 18, 90128 Palermo, Italy – sequence: 4 givenname: Donato orcidid: 0000-0001-6522-1259 surname: Cascio fullname: Cascio, Donato organization: Department of Physics and Chemistry (DiFC)-Emilio Segrè, University of Palermo, Viale Delle Scienze, Edificio 18, 90128 Palermo, Italy – sequence: 5 givenname: Giuseppe surname: Raso fullname: Raso, Giuseppe organization: Department of Physics and Chemistry (DiFC)-Emilio Segrè, University of Palermo, Viale Delle Scienze, Edificio 18, 90128 Palermo, Italy – sequence: 6 givenname: Manuele orcidid: 0000-0003-4062-3782 surname: Bettelli fullname: Bettelli, Manuele organization: IMEM/CNR, Parco Area delle Scienze 37/A, 43100 Parma, Italy – sequence: 7 givenname: Andrea orcidid: 0000-0002-6916-2716 surname: Zappettini fullname: Zappettini, Andrea organization: IMEM/CNR, Parco Area delle Scienze 37/A, 43100 Parma, Italy – sequence: 8 givenname: Paul surname: Seller fullname: Seller, Paul organization: Rutherford Appleton Laboratory, UKRI Science & Technology Facilities Council, Oxon OX11 0QX, UK – sequence: 9 givenname: Matthew C orcidid: 0000-0001-5457-4884 surname: Veale fullname: Veale, Matthew C organization: Rutherford Appleton Laboratory, UKRI Science & Technology Facilities Council, Oxon OX11 0QX, UK – sequence: 10 givenname: Leonardo surname: Abbene fullname: Abbene, Leonardo organization: Department of Physics and Chemistry (DiFC)-Emilio Segrè, University of Palermo, Viale Delle Scienze, Edificio 18, 90128 Palermo, Italy |
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Snippet | 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... |
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SubjectTerms | Arrays Cadmium Cadmium Compounds - chemistry Cadmium zinc tellurides charge sharing Charge transport charge-sharing correction Crystals CZT detectors Detectors Digital electronics Electrodes Energy Energy spectra Hole mobility incomplete charge collection Noise Nondestructive testing Photons Pixels Radiation Room temperature semiconductor pixel detectors Sensors Tellurium - chemistry Transport properties X ray imagery X-Rays Zinc - chemistry Zinc telluride Zinc tellurides |
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Title | Incomplete Charge Collection at Inter-Pixel Gap in Low- and High-Flux Cadmium Zinc Telluride Pixel Detectors |
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