Berlin 2015 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 22: Functional Materials IV: Thermoelectric and Multiferroic Materials
MM 22.2: Vortrag
Dienstag, 17. März 2015, 10:30–10:45, TC 010
Thermoelectric properties of individual Ag nanowires under the terms of quasiballistic transport — •Rüdiger Mitdank1, Danny Kojda1, Zhi Wang2, Johannes Ruhhammer2, Peter Woias2, and Saskia F. Fischer1 — 1AG Neue Materialien, Humboldt Universität zu Berlin, D-12489 Berlin, Newtonstr. 15 — 2Laboratory of Design of Microsystems, University of Freiburg, IMTEK, D-79110 Freiburg
The thermoelectric properties of Ag nanowires (NW) are discussed as a function of temperature T. Especially the electrical conductivity and the thermal conductivity showed reduced values with respect to the bulk. The latter are both notably dominated by surface scattering due to an increased surface-to-volume ratio. By lowering T, the electron mean free path strongly exceeds the NW's diameter of 150nm so that the transition from diffusive transport to quasi ballistic transport is observed. Whereas the conductivities are influenced by the NW's diameter the Lorenz number L(T) turns out to be independent of surface scattering. Instead of that, the characteristic of L(T) is determined by the material's purity. Moreover, the temperature dependence of the electrical conductivity and L(T) can be described by the bulk Debye temperature of silver.