Defect Antiperovskite Compounds Hg3 Q2 I2 (Q = S, Se, and Te) for Room-Temperature Hard Radiation Detection

Journal of the American Chemical Society
Yihui HeMercouri G Kanatzidis

Abstract

The high Z chalcohalides Hg3Q2I2 (Q = S, Se, and Te) can be regarded as of antiperovskite structure with ordered vacancies and are demonstrated to be very promising candidates for X- and γ-ray semiconductor detectors. Depending on Q, the ordering of the Hg vacancies in these defect antiperovskites varies and yields a rich family of distinct crystal structures ranging from zero-dimensional to three-dimensional, with a dramatic effect on the properties of each compound. All three Hg3Q2I2 compounds show very suitable optical, electrical, and good mechanical properties required for radiation detection at room temperature. These compounds possess a high density (>7 g/cm3) and wide bandgaps (>1.9 eV), showing great stopping power for hard radiation and high intrinsic electrical resistivity, over 1011 Ω cm. Large single crystals are grown using the vapor transport method, and each material shows excellent photo sensitivity under energetic photons. Detectors made from thin Hg3Q2I2 crystals show reasonable response under a series of radiation sources, including 241Am and 57Co radiation. The dimensionality of Hg-Q motifs (in terms of ordering patterns of Hg vacancies) has a strong influence on the conduction band structure, which gives t...Continue Reading

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Citations

Dec 10, 2019·Advanced Materials·Yonggang WangYusheng Zhao
Apr 25, 2018·Nature Communications·Yihui HeMercouri G Kanatzidis
Jan 26, 2021·Journal of the American Chemical Society·Yihui HeMercouri G Kanatzidis
Apr 20, 2021·Chemistry of Materials : a Publication of the American Chemical Society·Bogdan M BeninMaksym V Kovalenko
Jun 19, 2018·Journal of the American Chemical Society·Zhenhong WeiRen-Gen Xiong
Oct 8, 2019·Journal of the American Chemical Society·Haijie ChenMercouri G Kanatzidis
May 9, 2019·Journal of the American Chemical Society·Yaxing WangShuao Wang
Aug 8, 2018·Journal of the American Chemical Society·Jiangwei LiMercouri G Kanatzidis

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