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Title: TlSn2I5, a Robust Halide Antiperovskite Semiconductor for γ-Ray Detection at Room Temperature

Journal Article · · ACS Photonics

The semiconductor TlSn2I5 with a two-dimensional crystal structure and an antiperovskite topology is a promising novel detection material. The compound crystallizes in the I4/mcm space group, has an indirect band gap of 2.14 eV, and melts congruently at 314 °C. Electronic band structure calculations reveal that the most facile electron transport is along the ab layered plane. Compared to CH3NH3PbX3 (X = Br, I), TlSn2I5 features higher long-term stability, higher photon stopping power (average atomic number of 55), higher resistivity (~1010 Ω·cm), and robust mechanical properties. Centimeter-size TlSn2I5 single crystals grown from the melt by the Bridgman method can be used to fabricate detector devices, which detect Ag Kα X-rays (22 keV), 57Co γ-rays (122 keV), and 241Am α-particles (5.5 MeV). The mobility-lifetime product and mobility for electrons were estimated to be 1.1 × 10-3 cm2·V-1 and 94 ± 16 cm2·V-1·s-1, respectively. Unlike other halide perovskites, TlSn2I5 shows no signs of ionic polarization under long-term, high-voltage bias.

Research Organization:
Northwestern Univ., Evanston, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
Grant/Contract Number:
NA0002522; 2014-DN-077-ARI086-01; AC02-05CH11231
OSTI ID:
1494820
Alternate ID(s):
OSTI ID: 1488927
Journal Information:
ACS Photonics, Vol. 4, Issue 7; ISSN 2330-4022
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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