We report thermoelectric and electrical transport properties of Bi_1.8Sb_0.2Te_3-ySe_y by tuning y. In contrast to the reported p-type conductivity of the end compounds with y = 0 and 3, a dominant n-type conduction mechanism is observed for y = 1.5 from the Hall measurement. Intriguingly, the magneto-Seebeck consequence is enhanced up to ∼ 20 times for y = 1.5 compared to the end members. The reasonable value of magnetoresistance with an anisotropic character with respect to the direction of the magnetic field is observed at low temperature, which decreases with increasing temperature. The density of state at the Fermi level near room temperature correlates high Seebeck coefficient as well as magneto-Seebeck effect. High magneto-Seebeck effect at room temperature is promising for the application.

中文翻译：

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Bi1.8Sb0.2Te3-ySeycrystal 室温下的高磁塞贝克效应

我们通过调整y 来报告 Bi _1.8 Sb _0.2 Te _{3- y} Se _y的热电和电传输特性。与报道的具有y  = 0 和 3的末端化合物的p型电导率相反，从霍尔测量中观察到y  = 1.5的主要n型传导机制。有趣的是，对于y  =   1.5 比较端成员。在低温下观察到相对于磁场方向具有各向异性特征的磁阻的合理值，随着温度的升高而减小。接近室温的费米能级的态密度与高塞贝克系数以及磁塞贝克效应相关。室温下的高磁-塞贝克效应具有应用前景。