Crystal growth and characterization of the X-ray and γ-ray detector material Cs 2Hg 6S 7

Hao Li, John A. Peters, Zhifu Liu, Maria Sebastian, Christos D. Malliakas, John Androulakis, Lidong Zhao, In Chung, Sandy L. Nguyen, Simon Johnsen, Bruce W. Wessels, Mercouri G. Kanatzidis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Cs 2Hg 6S 7 is a promising compound for X-ray and γ-ray detection with a band gap of 1.63 eV. A new method is reported for the synthesis of Cs 2Hg 6S 7, along with growth studies of large Cs 2Hg 6S 7 crystals of dimensions up to several centimeters using the Bridgman method. Our growth technique gives reproducible crystals with high resistivity (10 6 ohm•cm). Crystals grown in this work exhibit figure of merit mobility lifetime (μτ) products comparable to commercial cadmium zinc telluride (CZT). The Cs 2Hg 6S 7 crystals exhibit a strong photoluminescence signal at low temperature in the range 1.50-1.75 eV. The thermal properties of the crystal, including the thermal expansion coefficient and the thermal conductivity, have been characterized. The nature of defects affecting the charge transport properties in the as-grown Cs 2Hg 6S 7 crystals is discussed. The noncentrosymmetric character of the tetragonal crystal structure (space group P4 2nm) gives rise to a nonlinear optical second harmonic generation response.

Original languageEnglish (US)
Pages (from-to)3250-3256
Number of pages7
JournalCrystal Growth and Design
Volume12
Issue number6
DOIs
StatePublished - Jun 6 2012

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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