Surface effects on thermoelectric properties of metallic and semiconducting nanowires
D. Kojda1, R. Mitdank1, S. Weidemann1, A. Mogilatenko2, Z. Wang3, J. Ruhhammer3, M. Kroener3, W. Töllner4, P. Woias3, K. Nielsch4, and S.F. Fischer1
Published in:
phys. stat. sol. (a), vol. 213, no. 3, pp. 557-570 (2016).
Abstract:
Metallic and semiconducting nanowires (NWs) are of interest in the field of thermoelectrics, because they act as model system to investigate the influence of surfaces on the thermoelectric transport properties. In single crystalline NWs, the grain boundary scattering is negligible and the surface-to-volume-ratio is high. We present state-of-the-art of the combination of the structural, chemical, and temperature-dependent full thermoelectric characterization for individual single crystalline NWs, which is essential to conclude on surface effects. Temperature-dependent measurements allow further conclusions on the scattering mechanisms. Simulations by the finite element method are performed on indented NWs to interpret the measurement results.
1 AG Neue Materialien, Humboldt-Universität zu Berlin, 12489 Berlin, Germany
2 Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, 12489 Berlin, Germany
3 Laboratory for Design of Microsystems, University of Freiburg IMTEK, 79110 Freiburg, Germany
4 Institut für Angewandte Physik, Universität Hamburg, 20355 Hamburg, Germany
Keywords:
surface effecs, thermoelectrics, nanowires, Lorenz number, finite element method.
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