Infrared LED Enhanced Spectroscopic CdZnTe Detector Working under High Fluxes of X-rays
This paper describes an application of infrared light-induced de-polarization applied on a polarized CdZnTe detector working under high radiation fluxes. We newly demonstrate the influence of a high flux of X-rays and simultaneous 1200-nm LED illumination on the spectroscopic properties of a CdZnTe...
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MDPI AG
2016-09-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/16/10/1591 |
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| author | Jakub Pekárek Václav Dědič Jan Franc Eduard Belas Martin Rejhon Pavel Moravec Jan Touš Josef Voltr |
| author_facet | Jakub Pekárek Václav Dědič Jan Franc Eduard Belas Martin Rejhon Pavel Moravec Jan Touš Josef Voltr |
| author_sort | Jakub Pekárek |
| collection | DOAJ |
| description | This paper describes an application of infrared light-induced de-polarization applied on a polarized CdZnTe detector working under high radiation fluxes. We newly demonstrate the influence of a high flux of X-rays and simultaneous 1200-nm LED illumination on the spectroscopic properties of a CdZnTe detector. CdZnTe detectors operating under high radiation fluxes usually suffer from the polarization effect, which occurs due to a screening of the internal electric field by a positive space charge caused by photogenerated holes trapped at a deep level. Polarization results in the degradation of detector charge collection efficiency. We studied the spectroscopic behavior of CdZnTe under various X-ray fluxes ranging between 5 × 10 5 and 8 × 10 6 photons per mm 2 per second. It was observed that polarization occurs at an X-ray flux higher than 3 × 10 6 mm − 2 ·s − 1 . Using simultaneous illumination of the detector by a de-polarizing LED at 1200 nm, it was possible to recover X-ray spectra originally deformed by the polarization effect. |
| first_indexed | 2024-04-12T19:40:45Z |
| format | Article |
| id | doaj.art-4e2161689c4e4e49b3fed055cc7d7cbd |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-12T19:40:45Z |
| publishDate | 2016-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-4e2161689c4e4e49b3fed055cc7d7cbd2022-12-22T03:19:06ZengMDPI AGSensors1424-82202016-09-011610159110.3390/s16101591s16101591Infrared LED Enhanced Spectroscopic CdZnTe Detector Working under High Fluxes of X-raysJakub Pekárek0Václav Dědič1Jan Franc2Eduard Belas3Martin Rejhon4Pavel Moravec5Jan Touš6Josef Voltr7Institute of Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, Prague 12116, Czech RepublicInstitute of Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, Prague 12116, Czech RepublicInstitute of Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, Prague 12116, Czech RepublicInstitute of Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, Prague 12116, Czech RepublicInstitute of Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, Prague 12116, Czech RepublicInstitute of Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, Prague 12116, Czech RepublicCrytur Ltd., Palackého 175, Turnov 51101, Czech RepublicNational Radiation Protection Institute, Bartoškova 28, Prague 14000, Czech RepublicThis paper describes an application of infrared light-induced de-polarization applied on a polarized CdZnTe detector working under high radiation fluxes. We newly demonstrate the influence of a high flux of X-rays and simultaneous 1200-nm LED illumination on the spectroscopic properties of a CdZnTe detector. CdZnTe detectors operating under high radiation fluxes usually suffer from the polarization effect, which occurs due to a screening of the internal electric field by a positive space charge caused by photogenerated holes trapped at a deep level. Polarization results in the degradation of detector charge collection efficiency. We studied the spectroscopic behavior of CdZnTe under various X-ray fluxes ranging between 5 × 10 5 and 8 × 10 6 photons per mm 2 per second. It was observed that polarization occurs at an X-ray flux higher than 3 × 10 6 mm − 2 ·s − 1 . Using simultaneous illumination of the detector by a de-polarizing LED at 1200 nm, it was possible to recover X-ray spectra originally deformed by the polarization effect.http://www.mdpi.com/1424-8220/16/10/1591CdZnTeX-ray detectorhigh fluxpolarizationde-polarizationPockels effect |
| spellingShingle | Jakub Pekárek Václav Dědič Jan Franc Eduard Belas Martin Rejhon Pavel Moravec Jan Touš Josef Voltr Infrared LED Enhanced Spectroscopic CdZnTe Detector Working under High Fluxes of X-rays Sensors CdZnTe X-ray detector high flux polarization de-polarization Pockels effect |
| title | Infrared LED Enhanced Spectroscopic CdZnTe Detector Working under High Fluxes of X-rays |
| title_full | Infrared LED Enhanced Spectroscopic CdZnTe Detector Working under High Fluxes of X-rays |
| title_fullStr | Infrared LED Enhanced Spectroscopic CdZnTe Detector Working under High Fluxes of X-rays |
| title_full_unstemmed | Infrared LED Enhanced Spectroscopic CdZnTe Detector Working under High Fluxes of X-rays |
| title_short | Infrared LED Enhanced Spectroscopic CdZnTe Detector Working under High Fluxes of X-rays |
| title_sort | infrared led enhanced spectroscopic cdznte detector working under high fluxes of x rays |
| topic | CdZnTe X-ray detector high flux polarization de-polarization Pockels effect |
| url | http://www.mdpi.com/1424-8220/16/10/1591 |
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