Thermal Conductivity and Thermoelectric Figure of Merit of Bi 1−x Sb x Films With 0 < x ≦ 0.3

The thermal conductivity λ and thermoelectric figure of merit z of Bi 1−x Sb x films with 0 < x ≦ 0.3 and thicknesses from 30 to 400 nm are measured in the temperature range 80 to 400 K. The lattice thermal conductivity λϱ is determined from the measured total thermal conductivity λ and the calculated charge carrier contribution λ e . The results are discussed in the framework of earlier proposed models for the charge carrier and phonon heat transport in polycrystalline films. The Sb‐concentrations for maximum z ‐values of the films are established.