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    We report that the chalcohalide compound Tl(6)SeI(4) is a promising material for efficient X-ray and γ-ray detection. This material has a higher figure of merit than the current state-of-the-art material for room-temperature operation, Cd(0.9)Zn(0.1)Te (CZT). We have synthesized high-quality single-crystalline wafers of Tl(6)SeI(4) with detector-grade resistivities and good carrier transport of both electrons and holes. We demonstrate that pulse height spectra recorded using Co-57 radiation show an energy resolution matching that of a commercial CZT detector material.


    Simon Johnsen, Zhifu Liu, John A Peters, Jung-Hwan Song, Sandy Nguyen, Christos D Malliakas, Hosub Jin, Arthur J Freeman, Bruce W Wessels, Mercouri G Kanatzidis. Thallium chalcohalides for X-ray and γ-ray detection. Journal of the American Chemical Society. 2011 Jul 6;133(26):10030-3

    PMID: 21671681

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