Crystal Growth and Characterization of the X-ray and gamma-ray Detector Material Cs2Hg6S7

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Cs2Hg6S7 is a promising compound for X-ray and gamma-ray detection with a band gap of 1.63 eV. A new method is reported for the synthesis of Cs2Hg6S7, along with growth studies of large Cs2Hg6S7 crystals of dimensions up to several centimeters using the Bridgman method. Our growth technique gives reproducible crystals with high resistivity (10(6) ohm center dot cm). Crystals grown in this work exhibit figure of merit mobility lifetime (mu tau) products comparable to commercial cadmium zinc telluride (CZT). The Cs2Hg6S7 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 Cs2Hg6S7 crystals is discussed. The noncentrosymmetric character of the tetragonal crystal structure (space group P4(2)nm) gives rise to a nonlinear optical second harmonic generation response.
Publisher
AMER CHEMICAL SOC
Issue Date
2012-06
Language
English
Article Type
Article
Keywords

PBI2 SINGLE-CRYSTALS; DIMENSIONAL REDUCTION; THERMOELECTRIC PROPERTIES; ELECTRICAL-PROPERTIES; OPTICAL-PROPERTIES; ION-EXCHANGE; CDTE; RB; CS; SE

Citation

CRYSTAL GROWTH DESIGN, v.12, no.6, pp.3250 - 3256

ISSN
1528-7483
DOI
10.1021/cg300385s
URI
http://hdl.handle.net/10203/66147
Appears in Collection
NT-Journal Papers(저널논문)
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