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

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


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
Pages (from-to)3250-3256
Number of pages7
JournalCrystal Growth and Design
Issue number6
Publication statusPublished - Jun 6 2012

ASJC Scopus subject areas

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

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