Thermoelectric Characteristics of the p-type (Bi, Sb)_2Te_3 Nanocomposites Processed with Silicon Nanodispersion

摘要

The p-type (Bi_(0.2)Sb_(0.8))_2Te_3 powders were mechanically alloyed and hot pressed at 500℃ for 30 minutes with dispersion of Si nanopowders up to 3 vol%. The thermal conductivity of the (Bi_(0.2)Sb_(0.8))_2Te_3 nanocomposite was substantially reduced with dispersion of 0.3～3 vol% Si nanopowders due to the enhanced phonon scattering. The maximum dimensionless figure-of-merit of 1.32 at 75℃ was obtained for the (Bi_(0.2)Sb_(0.8))_2Te_3 nanocomposite dispersed with 1 vol% Si nanopowders, compared to 1.08 of the specimen without Si nanopowder dispersion.