Regensburg 2019 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 10: Thermoelectric and Phase Change Materials

DS 10.5: Vortrag

Montag, 1. April 2019, 17:45–18:00, H39

Absolute Seebeck coefficient of thin platinum films and individual silver nanowires — •Maximilian Kockert¹, Danny Kojda¹, Rüdiger Mitdank¹, Anton Zykov², Stefan Kowarik^2,3, Johannes Ruhhammer⁴, Zhi Wang⁴, Michael Kröner⁴, Peter Woias⁴, Toni Markurt⁵, and Saskia F. Fischer¹ — ¹Novel Materials Group, Humboldt-Universität zu Berlin, D-10099 Berlin — ²Nanoscale processes and growth, Humboldt-Universität zu Berlin, D-10099 Berlin — ³Bundesamt für Materialforschung und -prüfung (BAM), D-12203 Berlin — ⁴Laboratory for Design of Microsystems (IMTEK), University of Freiburg, D-79110 Freiburg — ⁵Leibniz-Institute for Crystal Growth (IKZ), D-12489 Berlin

Thermoelectric properties of as sputtered and tempered thin platinum films and single crystalline silver nanowires were investigated and compared to bulk. Structural properties like film thickness, grain size and nanowire diameter were correlated with the thermoelectric properties. Furthermore, we present a model to describe the temperature dependence of the absolute Seebeck coefficient S of thin films, nanowires and bulk, which consists of a thermodiffusion and phonon drag part. S of thin platinum films is reduced compared to the bulk and we find that the film thickness and grain size by means of the electron mean free path influence S. Silver nanowires exhibit a reduction of the thermodiffusion part and a shift of the phonon drag peak towards higher bath temperatures compared to the bulk, but without changing the maximum value of S. In addition, a discussion of the influence of the electron-phonon and phonon-phonon interaction on S is given.