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 language||English (US)|
|Number of pages||7|
|Journal||Crystal Growth and Design|
|State||Published - Jun 6 2012|
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics