Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 1: Tutorial: Thermoelectricity - The Quest for a High Figure of Merit

TT 1.2: Tutorium

Sonntag, 30. März 2014, 16:50–17:35, HSZ 304

Thermal Transport Measurements at the Nanoscale — •Saskia F. Fischer — AG Neue Materialien, Humboldt-Universität zu Berlin, 10099 Berlin

In this tutorial first an introduction to measurements of the electrical conductivity, the thermopower and the thermal conductance will be given. All three material parameters are required to determine the thermoelectric figure of merit. However, the measurement techniques which are successfully applied to bulk materials often cannot be transferred to nanoscale materials such as individual ultra-thin films, flakes or nanowires. On behalf of particular examples, I will discuss measurement techniques for such nanomaterials. In particular, the application of a micro-machined platform for the full ZT-characterization allowing as well for the investigation of the crystal structure and chemical composition of a single nanowire will be demonstrated. If time allows, an outlook to thermal transport in low-dimensional charge carrier systems and the determination of the charge carrier temperature via noise thermometry will be given.