De-polarization of a CdZnTe radiation detector by pulsed infrared light

Journal Article · Mon Jul 20 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4927382· OSTI ID:22486339

Franc, J.; Rejhon, M.; Grill, R.; Zázvorka, J. ^[1]; Sellin, P. J. ^[2]

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1. Institute of Physics, Charles University, Ke Karlovu 5, Prague 121 16 (Czech Republic)
2. Department of Physics, University of Surrey, Guildford GU2 7XH (United Kingdom)

This work is focused on a detailed study of pulsed mode infrared light induced depolarization of CdZnTe detectors operating at high photon fluxes. This depolarizing effect is a result of the decrease of positive space charge that is caused by the trapping of photogenerated holes at a deep level. The reduction in positive space charge is due to the optical transition of electrons from a valence band to the deep level due to additional infrared illumination. In this paper, we present the results of pulse mode infrared depolarization, by which it is possible to keep the detector in the depolarized state during its operation. The demonstrated mechanism represents a promising way to increase the charge collection efficiency of CdZnTe X-ray detectors operating at high photon fluxes.

• OSTI ID: 22486339
• Journal Information: Applied Physics Letters, Vol. 107, Issue 3; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHARGE COLLECTION
DEPOLARIZATION
EFFICIENCY
ELECTRONS
HOLES
ILLUMINANCE
PHOTONS
POLARIZATION
PULSES
RADIATION DETECTORS
SPACE CHARGE
TRAPPING
VALENCE
X RADIATION