Dresden 2017 – scientific programme
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DS: Fachverband Dünne Schichten
DS 36: Postersession I
DS 36.29: Poster
Wednesday, March 22, 2017, 17:00–19:00, P2-EG
Thermoelectric Characterization of Organic Thin Films — •Kiana Baumgaertner1, Alexander Steeger1, Florian Huewe1, and Jens Pflaum1,2 — 1Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg
Conducting organic thin films have recently been proposed as innovative thermoelectric materials to recover waste heat at low cost[1]. To characterize their thermoelectric figure of merit zT it is necessary to determine the materials’ electrical and thermal conductivity as well as their Seebeck coefficient. In this study, we developed an experimental setup to consistently measure this set of parameters on a single thin film sample for temperatures ranging from 4 K to 300 K. The thermal conductivity is characterized based on the 3ω-method by periodic Joule heating of a metal strip deposited atop the film. This metal strip acts as a heater creating a temperature gradient across the sample for measurement of the Seebeck voltage between two separate contacts. Optimizing the measurement geometry by performing finite-element simulations on thin films of thicknesses below d=1 µ m and thermal conductivities of κ≤1 W/(m K), the functionality of this setup has been verified on oxide as well as polymeric thin film samples. First results on the thermoelectric performance of functionalized organic layers will be presented that highlight the potential of this material class. [1] O. Bubnova et al., Nat. Mater. 2011, 10, 429.