Berlin 2015 – scientific programme
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DS: Fachverband Dünne Schichten
DS 10: Thermoelectric materials
DS 10.1: Talk
Tuesday, March 17, 2015, 09:30–09:45, H 0111
Complete thermoelectric material characterization at high temperatures — •Hendrik Kolb1, Titas Dasgupta2, Johannes de Boor1, Knud Zabrocki1, and Eckhard Müller1,3 — 1Institute of Materials Research, German Aerospace Center — 2Dept. of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay — 3Institute of Inorganic and Analytical Chemistry, Justus-Liebig-Universität Gießen
Thermoelectricity is the direct conversion of thermal energy into electrical energy and can be used for the recovery of waste heat into electrical power. For an efficient research process a quick characterization is crucial to see the effects of the material manufacturing process on the thermoelectric properties. The three thermoelectric key quantities can strongly be temperature dependent, which makes a complete characterization over a wide temperature range necessary. The special feature of our system is the additional direct zT measurement by the Harman method independently from the single measurements to verify the results. The better comparability of the measured properties is one main advantage in a simultaneous measurement, because all quantities are measured at one temperature step. Additionally the measurement uncertainty which can easily reach more than 20% in the zT measurement due to methodical or geometrical differences in different setups is reduced. We show results for a complete high temperature characterization of thermoelectric materials up to 650 K and show good agreement with reference data. Also, we demonstrate the influence of radiation losses on thermal conductivity measurement.