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Charge Sharing and Charge Loss in High-Flux Capable Pixelated CdZnTe Detectors
- Source :
- Sensors, Volume 21, Issue 9, Sensors, Vol 21, Iss 3260, p 3260 (2021), Sensors (Basel, Switzerland)
- Publication Year :
- 2021
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2021.
-
Abstract
- Cadmium zinc telluride (CdZnTe) detectors are known to suffer from polarization effects under high photon flux due to poor hole transport in the crystal material. This has led to the development of a high-flux capable CdZnTe material (HF-CdZnTe). Detectors with the HF-CdZnTe material have shown promising results at mitigating the onset of the polarization phenomenon, likely linked to improved crystal quality and hole carrier transport. Better hole transport will have an impact on charge collection, particularly in pixelated detector designs and thick sensors (&gt<br />1 mm). In this paper, the presence of charge sharing and the magnitude of charge loss were calculated for a 2 mm thick pixelated HF-CdZnTe detector with 250 μm pixel pitch and 25 μm pixel gaps, bonded to the STFC HEXITEC ASIC. Results are compared with a CdTe detector as a reference point and supported with simulations from a Monte-Carlo detector model. Charge sharing events showed minimal charge loss in the HF-CdZnTe, resulting in a spectral resolution of 1.63 ± 0.08 keV Full Width at Half Maximum (FWHM) for bipixel charge sharing events at 59.5 keV. Depth of interaction effects were shown to influence charge loss in shared events. The performance is discussed in relation to the improved hole transport of HF-CdZnTe and comparison with simulated results provided evidence of a uniform electric field.
- Subjects :
- X-ray detector
Materials science
Physics::Instrumentation and Detectors
charge loss
Physics::Medical Physics
TP1-1185
01 natural sciences
Biochemistry
Dot pitch
Article
Analytical Chemistry
Charge sharing
chemistry.chemical_compound
Electric field
0103 physical sciences
Electrical and Electronic Engineering
010306 general physics
Instrumentation
charge sharing
010308 nuclear & particles physics
business.industry
Chemical technology
Detector
Charge (physics)
Atomic and Molecular Physics, and Optics
Cadmium zinc telluride
Full width at half maximum
chemistry
pixel detector
Optoelectronics
CdZnTe
business
Subjects
Details
- Language :
- English
- ISSN :
- 14248220
- Database :
- OpenAIRE
- Journal :
- Sensors
- Accession number :
- edsair.doi.dedup.....860524bfd18c5bebc4e20784a55598fb
- Full Text :
- https://doi.org/10.3390/s21093260