Internal electric field behavior of cadmium zinc telluride radiation detectors under high carrier injection

G. Yang, A. E. Bolotnikov, G. S. Camarda, Y. Cui, A. Hossain, K. H. Kim, R. Gul, R. B. James

Research output: Contribution to journalArticlepeer-review

Abstract

The behavior of the internal electric field of nuclear-radiation detectors substantially affects detector performance. We investigated the distribution of the internal field in cadmium zinc telluride (CZT) detectors under high carrier injection. We noted the build-up of a space-charge region near the cathode that produces a built-in field opposing the applied field. Its presence entails the collapse of the electric field in the rest of the detector, other than the portion near the cathode. Such a space-charge region originates from serious hole trapping in CZT. The device's operating temperature greatly affects the width of the space-charge region. With increasing temperature from 5°C to 35°C, its width expanded from about one-sixth to one-half of the total depth of the detector.

Original languageEnglish
Pages (from-to)1689-1692
Number of pages4
JournalJournal of Electronic Materials
Volume40
Issue number8
DOIs
Publication statusPublished - 2011 Aug
Externally publishedYes

Keywords

  • CZT
  • Pockels effect
  • electric field
  • hole trapping
  • polarization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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