Electrical conduction of SnBi4Se7
Source abstract
Abstract
Polycrystalline samples of Bi2Se3 and stoichiometric ternary compounds in the quasi-binary system SnSe-Bi2Se3 were characterized by measurements of temperature and field dependence of electrical conductivity. The current density–electric field characteristics were found to be non-linear, especially when the applied electric field exceeds a certain value which is dependent on the temperature T. Furthermore, the electrical conductivity can be enhanced by the applied electric field. The characteristic length a(T) seemed to be enhanced with increasing temperature. Electrical conductivity measurements elucidated the semiconducting behaviour of both compounds, especially when the temperature of measurement exceeds a certain value for SnBi4Se7, and hopping and band type conduction are dominant at low and high ranges of temperature, respectively. Below 200 K, the electrical conductivity of SnBi4Se7 decreases with increasing temperature. Meanwhile, additional scattering and hopping seemed to characterize the behaviour of SnBi4Se7 due to the Sn doping of Bi2Se3 resulting in additional states at the Fermi level.
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Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Topological Materials and Phenomena · Phase-change materials and chalcogenides
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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