Investigation of degradation of electrical and photoelectrical properties in TlBr crystals

Influence of electronic and ionic processes on electrical properties of TlBr crystals

“…1). Under the same conditions, a monotonic process similar to a capacitance charging was observed previously for samples with aquadag electrodes [3]. When the sample was biased at +30 V on the Tl contact the current increased, with oscillations.…”

“…At low frequencies dielectric losses increase with increasing temperature and cause an increase of the real part of the dielectric permittivity. Such an effect can be caused by ionic conductivity, as shown previously [3]. At low frequencies, conduction phenomena dominate in the dielectric spectra.…”

“…The mechanism of electrical conductivity at room temperature is complicated by an ionic component [2]. A previous work [3] investigated a TlBr detector with aquadag electrodes. In this paper, the role of extrinsic ions was analysed.…”

Temperature dependence in the long-term stability of the TlBr detector

“…In this case, it is observed that the counting rate increases, randomly, due to the incidence of aleatory pulse formation. Vaitkus et al [9] had already described this phenomenon as discharge of polarization and Donmez et al [10] as a breakdown. This phenomenon is not remarkably observed in the pulse height measurement, since it does not affect the energy spectra significantly, due to its random amplitude spectrum characteristics.…”

The sensitivity of pure and doped TlBr crystals

“…TlBr is one of the prospective materials used for these detectors manufacturing [2]. Among the advantages of TlBr detectors of gamma radiation are, first of all, a high value of the band-gap energy of 2.68 eV and a high atomic number of the component elements (Tl-81, Br -35) [3].…”