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MM: Fachverband Metall- und Materialphysik

MM 38: Nanomaterials

MM 38.2: Vortrag

Mittwoch, 14. März 2018, 15:30–15:45, H 0106

Absolute Seebeck coefficient of individual silver nanowires — •Maximilian Kockert¹, Danny Kojda¹, Rüdiger Mitdank¹, Johannes Ruhhammer², Zhi Wang², Michael Kröner², Peter Woias², Toni Markurt³, and Saskia F. Fischer¹ — ¹Novel Materials Group, Humboldt-Universität zu Berlin, D-12489 Berlin — ²Laboratory for Design of Microsystems, University of Freiburg - IMTEK, D-79110 Freiburg — ³Leibniz-Institute for Crystal Growth, D-12489 Berlin

The Seebeck coefficient S consists of the diffusion part and the phonon drag part. The first part occurs due to thermal diffusion of charge carriers in the material caused by a temperature gradient. The second part is due to the interactions between electrons and phonons. Phonon drag is still today not fully understood. In order to investigate the influence of the phonon-phonon interaction and electron-phonon interaction on S, the absolute S of individual, highly pure and single crystalline silver nanowires is determined. In a comparison between the absolute S of bulk silver and silver nanowires, we demonstrate the influence of micro- and nanostructuring on the temperature-dependent profile of S. We show a reduction of the thermodiffusion part of S of the silver nanowires and a shift of the phonon drag peak towards higher temperatures compared to the bulk material, but without changing the maximum value of S. Here, we present a model for the absolute S, which demonstrates a reduction of the phonon-phonon interaction with respect to the electron-phonon interaction in the silver nanowires compared to bulk silver.