Influence of Magnetic Impurities on Thermoelectric Capabilities of Bi2Te3, Sb2Te3, and Bi2Se3

V.A. Kulbachinskii; V.G. Kytin; A.A. Kudryashov; P.M. Tarasov

doi:10.4028/www.scientific.net/SSP.190.558

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Influence of Magnetic Impurities on Thermoelectric Capabilities of Bi₂Te₃, Sb₂Te₃, and Bi₂Se₃

Abstract:

Temperature dependencies of the Seebeck coefficient, electrical conductivity, heat conductivity and the dimensionless thermoelectric figure of merit ZT of p-Bi₂Te₃, n-Bi₂Se₃ and Sb₂Te₃ doped by Fe or Cr have been investigated in the temperature interval 7 < T < 300 K. At T=4.2 K the Shubnikov-de Haas and Hall effects have been measured. By increasing the Fe content, the hole concentration decreases in p-Bi_2-xFe_xTe₃, while the electron concentration increases in n-Bi_2-xFe_xSe₃. The hole concentration decreases in Sb_2-xCr_xTe₃ with Cr doping. This demonstrates that Fe or Cr act as donors. The Seebeck coefficient increases in p-Bi_2-xFe_xTe₃ and Sb_2-xCr_xTe₃ with increasing Fe or Cr content, while it decreases in n-Bi_2-xFe_xSe₃.