Passivation effect on large volume CdZnTe crystals

B. Park, Y. Kim, J. Seo, J. Byun, K. Kim

Research output: Contribution to journalArticlepeer-review

Abstract

Several cadmium zinc telluride (CZT) crystals were fabricated into radiation detectors using methods that included slicing, dicing, lapping, polishing, and chemical etching. A wet passivation with sodium hypochlorite (NaOCl) was then carried out on the Br-etched detectors. The Te-rich layer on the CZT surface was successfully compensated to the Te oxide layer, which was analyzed with X-ray photoelectron spectroscopy data of both a Br-etched crystal and a passivated CZT crystals. We confirmed that passivation with NaOCl improved the transport property by analyzing the mobility-lifetime product and surface recombination velocity. The electrical and spectroscopic properties of large volume detectors were compared before and after passivation, and then the detectors were observed for a month. Both bar and quasi-hemispherical detectors show an enhancement in performance after passivation. Thus, we could identify the effect of NaOCl passivation on large volume CZT detectors.

Original languageEnglish
Pages (from-to)4620-4624
Number of pages5
JournalNuclear Engineering and Technology
Volume54
Issue number12
DOIs
Publication statusPublished - 2022 Dec

Keywords

  • CdZnTe detector
  • Passivation
  • Sodium hypochlorite
  • Surface recombination velocity

ASJC Scopus subject areas

  • Nuclear Energy and Engineering

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