Crystal Growth and Characterization of the X-ray and γ-ray Detector Material Cs2Hg6S7
| Autor: | John A. Peters, Zhifu Liu, Hao Li, Christos D. Malliakas, Maria Sebastian, John Androulakis, Sandy L. Nguyen, Mercouri G. Kanatzidis, Simon Johnsen, Li-Dong Zhao, Bruce W. Wessels, In Chung |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Band gap Analytical chemistry Crystal growth General Chemistry Condensed Matter Physics Cadmium telluride photovoltaics Cadmium zinc telluride Crystal Tetragonal crystal system chemistry.chemical_compound Crystallography Thermal conductivity chemistry Figure of merit General Materials Science |
| Zdroj: | Crystal Growth & Design. 12:3250-3256 |
| ISSN: | 1528-7505 1528-7483 |
| Popis: | Cs2Hg6S7 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 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 (106 ohm·cm). Crystals grown in this work exhibit figure of merit mobility lifetime (μτ) 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 P42nm) gives rise to a nonlinear optical second harmonic generation response. |
| Databáze: | OpenAIRE |
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