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Proceedings Paper

Crystal growth and characterization of Hg-based chalcogenide compounds (Conference Presentation)
Author(s): Yihui He; Wenwen Lin; Jonathan C. Syrigos; Peng Li Wang; Saiful M. Islam; Kyle M. McCall; Svetlana S. Kostina; Zhifu Liu; Bruce W. Wessels; Mercouri G. Kanatzidis
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Paper Abstract

In this work, two Hg-based chalcogenides were investigated in detail to reveal their potential capability of radiation detection at room temperature (RT). Cs2Hg6S7, with a bandgap of 1.63 eV, which is designed by the dimensional reduction theory proposed by our group, were prepared and characterized. α-HgS, with a bandgap of ~2.10 eV, as a precursor used for the ternary compound synthesis, was also proposed and further investigated. For Cs2Hg6S7, the crystals tended to crystallize into needle form with small grains. Here, the conditions of Bridgman melt growth were optimized to obtain relatively large single crystals. The slight excess of Cs2S as a fluxing agent during growth was found to facilitate better crystallization and large grains. Interestingly, no inclusion or secondary phase was found in the as-grown single crystals. The improvement of bulk resistivity from ~10^6 Ωcm to 10^8 Ωcm was also achieved through the control of stoichiometry during crystal growth. For α-HgS crystals, both physical vapor transport and chemical vapor transport methods have been applied. By modifying the transport temperature and transport agent, single crystal with size about 3x1.5 mm^2 was grown with resistivity higher than 10^11 Ωcm. Photoluminescence (PL) revealed that multiple peaks observed in the 1.6-2.3 eV range and excitonic peak from for α-HgS single crystals were observed indicating good crystalline quality. Finally, the planar detectors for both crystals were tested under Co57 gamma ray source. Both of the crystals showed reasonable gamma ray response, while α-HgS crystals could respond at a relatively higher counting rate.

Paper Details

Date Published: 2 November 2016
PDF: 1 pages
Proc. SPIE 9968, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVIII, 99680B (2 November 2016); doi: 10.1117/12.2237827
Show Author Affiliations
Yihui He, Northwestern Univ. (United States)
Wenwen Lin, Northwestern Univ. (United States)
Jonathan C. Syrigos, Northwestern Univ. (United States)
Peng Li Wang, Northwestern Univ. (United States)
Saiful M. Islam, Northwestern Univ. (United States)
Kyle M. McCall, Northwestern University (United States)
Svetlana S. Kostina, Northwestern Univ. (United States)
Zhifu Liu, Northwestern Univ. (United States)
Bruce W. Wessels, Northwestern Univ. (United States)
Mercouri G. Kanatzidis, Northwestern Univ. (United States)

Published in SPIE Proceedings Vol. 9968:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVIII
Ralph B. James; Michael Fiederle; Arnold Burger; Larry Franks, Editor(s)

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