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DS: Fachverband Dünne Schichten

DS 36: Postersession I

DS 36.28: Poster

Mittwoch, 22. März 2017, 17:00–19:00, P2-EG

Thermal Conductivity of Thin Films Determined via IR thermography — •Natalie Galfe¹, Anton Greppmair¹, Benedikt Stoib¹, Nitin Saxena², Caroline Gerstberger¹, Peter Müller-Buschbaum², Martin Stutzmann¹, and Martin S. Brandt¹ — ¹Walter Schottky Institut and Physik-Department, Technische Universität München, Am Coulombwall 4, 85748 Garching — ²Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München, James-Franck-Strasse 1, 85748 Garching

In fields such as microelectronics and thermoelectrics, heat management becomes increasingly important. However, with the continuous miniaturization of the corresponding devices, established methods for the determination of the thermal conductance face severe challenges. Here, we demonstrate a simple and quick method for the measurement of the in-plane thermal conductance of thin films via steady-state infrared thermography. The films are suspended above a hole in an opaque substrate and homogeneously heated by a visible light source. The temperature distribution of the thin films is captured via IR microscopy and fitted to the analytical expression obtained for the specific hole geometry used in order to obtain the in-plane thermal conductivity. For thin films of PEDOT:PSS post-treated with ethylene glycol and of polyimide we find conductivities of 1.0 W/mK and 0.4 W/mK at room temperature, respectively. Furthermore, we are able to demonstrate the influence of varying the electrical conductance of the PEDOT:PSS films on the resulting thermal conductance. All results are in very good agreement with literature values.