Loughborough University
Browse
- No file added yet -

Charge sharing and charge loss in high-flux capable pixelated CdZnTe detectors

Download (1.48 MB)
journal contribution
posted on 2021-06-01, 12:42 authored by Kjell Koch-Mehrin, Sarah BugbySarah Bugby, John Lees, Matthew Veale, Matthew Wilson
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 (> 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 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.

Funding

Kjell A.L. Koch-Mehrin is supported by a University of Leicester LISEO studentship.

History

School

  • Science

Department

  • Physics

Published in

Sensors

Volume

21

Issue

9

Publisher

MDPI AG

Version

  • VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by MDPI under the Creative Commons Attribution 4.0 International Licence (CC BY 4.0). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Acceptance date

2021-05-06

Publication date

2021-05-08

Copyright date

2021

eISSN

1424-8220

Language

  • en

Depositor

Dr Sarah Bugby. Deposit date: 6 May 2021

Article number

3260

Usage metrics

    Loughborough Publications

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC