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- W2040607475 abstract "Thallium bromide (TlBr) is attractive for high energy radiation detection, given its large molecular weight and wide energy bandgap. However, TlBr exhibits levels of ionic conductivity that can lead to an undesirable leakage, or dark current, thereby reducing sensor performance. To investigate the role of dopants in controlling the ionic conductivity, single crystals of TlBr were grown using zone refining and/or vertical Bridgman methods with controlled levels of donor (Pb) dopants. Their electrical properties were examined as a function of temperature (20-300°C) with frequency dependent impedance spectroscopy. A Schottky-based defect equilibria model was fitted to the resulting conductivity data, and enthalpies of Schottky defect formation (0.91 ± 0.03 eV), cation migration (0.51 ± 0.03 eV), and anion migration (0.28 ± 0.05 eV) were extracted. Br vacancies were found to posses about 5 orders of magnitude higher mobility than that of T1 vacancies at 20°C." @default.
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- W2040607475 date "2011-01-01" @default.
- W2040607475 modified "2023-10-16" @default.
- W2040607475 title "The Defect and Transport Properties of Donor Doped Single Crystal TlBr" @default.
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- W2040607475 doi "https://doi.org/10.1149/1.3525243" @default.
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