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- Title
Use of Sub-bandgap Illumination to Improve Radiation Detector Resolution of CdZnTe.
- Authors
Duff, Martine; Washington, Aaron; Teague, Lucile; Wright, Jonathan; Burger, Arnold; Groza, Michael; Buliga, Vladimir
- Abstract
The performance of CdZnTe (CZT) materials for room-temperature gamma/x-ray radiation detection continues to improve in terms of material quality and detector design. In our prior publications, we investigated the use of multiple wavelengths of light (in the visible and infrared) to target charge carriers at various trap energies and physical positions throughout crystals. Light exposure significantly alters the charge mobility and improves carrier collection at the anode contact. This study presents an investigation of material performance as a radiation detector during such illumination. The decrease in charge trapping and increase in charge collection due to a higher probability of free electron release from traps contributed to an increase in the resolution-based performance of the detector through controlled illumination. We investigated the performance improvement of CZT crystals with previously known levels of intrinsic defects and secondary phases, at various voltages, light-emitting diode (LED) light wavelengths, and shaping times. Although our setup was clearly not optimized for radiation detector performance, it demonstrated substantial resolution improvements (based on full-width at half-maximum using 662-keV gamma rays from Cs upon illumination with 950-nm light) of 16% to 38% in comparison with unilluminated CZT under similar conditions. This manuscript includes discussion of the electrooptic behavior and its effect on performance. Additional testing and fabrication of a detector that incorporates such LED light optimization could lead to improved performance with existing detector-grade materials.
- Subjects
LIGHTING; BAND gaps; NUCLEAR counters; CADMIUM zinc telluride detectors; DETECTORS; MACHINE design; WAVELENGTHS; ANODES; CRYSTAL defects
- Publication
Journal of Electronic Materials, 2015, Vol 44, Issue 9, p3207
- ISSN
0361-5235
- Publication type
Article
- DOI
10.1007/s11664-015-3926-y