Thermoelectric properties of Bi2Te3, Sb2Te3 and Bi2Se3 single crystals with magnetic impuritiesстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Temparature dependence of Seebeck coefficients S, electrical conductivity, heat conductivity k and dimensionless thermoelectric figure of merit ZT of p-Bi2Te3, Sb2Te3 and n-Bi2Se3-doped by Fe or Cr were carried out in the temperature interval 7<T<300 K. At T=4.2 K Shubnikov-de Haas and Hall effects have been measured. By increasing the Fe content, the hole concentration decreases in p-Bi2−xFexTe3, while the electron concentration increases in n-Bi2−xFexSe3. The decrease of the hole concentration was observed in p-Sb2−xCrxTe3 single crystals with Cr-doping. This demonstrates that Fe or Cr act as donors. The Seebeck coefficient increases in p-Bi2−xFexTe3 and Sb2−xCrxTe3 with increasing Fe or Cr content, while it decreases in n-Bi2−xFexSe3. Cr-doping increases dimensionless thermoelectric figure of merit ZT in Sb2Te3 at T>150 K