The n-type Bi2Te3-Bi2Se3 alloy is less straightforward.


The n-type Bi2Te3-Bi2Se3 alloy is less straightforward. Mass contrast alloy scattering modeling does not match thermal conductivity values reported in the literature, and there is wide variability in qualitative trends reported. The electronic band structure of Bi2Te3 comprises conduction and valence band extrema with high valley degeneracy. In contrast, the structure of Bi2Se3 is far simpler, with a direct gap between singly degenerate extrema at the Γ point. This dramatic difference in Fermi surface complexity and a peak in the optical band gap near the intermediate composition Bi2Te2Se suggests that complex band dynamics are in play. There has recently been a great deal of interest in the electronic structure of Bi2Te3−xSex alloys, as these materials are also topological insulators. Accordingly, these studies have primarily focused on the surface states and the variation in the composition of the energy level of the Dirac point relative to band edges. While the bulk structures of the end members Bi2Te3 and Bi2Se3 have been extensively studied, a comprehensive description of the dynamics in the alloy has not been reported. This report aims to explain long-standing unresolved issues in the Bi2Te3−xSex alloy system. Combining experimental results from the literature and new electronic structure calculations, we describe how the electronic structure changes with composition. Electronic structure calculations for this system are highly sensitive to the magnitude of the spin-orbit interaction, which has complicated resolving these issues. This is then used to parameterize the electronic transport in n-type Bi2Te3−xSex in an effective mass model. If you are looking for high quality, high purity, and cost-effective Bismuth Telluride, or if you require the latest price of Bismuth Telluride, please feel free to email contact mis-asia.

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