Journal
PHYSICAL REVIEW B
Volume 87, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.081202
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Funding
- US Dept. of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- National Nuclear Security Administration Office of Nonproliferation and Verification Research and Development [NA-22]
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Thallium bromide (TlBr) is an ionic semiconductor that has shown great capacity for accurate radiation detection. Its application to this end, however, has been hampered by degradation of performance over time, in a process called polarization. This effect has been traditionally assigned to a build-up of ions at the electrodes, which would counteract an applied electrical bias field. Here, we estimate the ionic mobility in TlBr and its possible association with the polarization effect using parameter-free quantum simulations. Our results indicate that in samples with up to moderate levels of impurities, ions cannot traverse distances large enough to generate zones of accumulation and depletion in the crystal, suggesting different causes for the polarization effect. DOI: 10.1103/PhysRevB.87.081202
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