Regensburg 2022 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster 1
CPP 12.40: Poster
Montag, 5. September 2022, 18:00–20:00, P1
Investigation of the charge transport of ionic liquid post-treated PEDOT:PSS thin films with in-situ surface plane impedance spectroscopy, under the influence of varying temperature and humidity — •Tobias Schöner1, Anna Lena Oechsle1, and Peter Müller-Buschbaum1,2 — 1Lehrstuhl für Funktionelle Materialien, Physik- Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany — 2Heinz Maier-Leibnitz-Zentrum (MLZ), Technische Universität München, Lichtenbergstr. 1, 85748 Garching, Germany
Thermoelectric materials based on polymers are attractive due to their large-scale and low cost processability, high mechanical flexibility, low or no toxicity, lightness and intrinsically low thermal conductivity. One highly investigated polymer with promising thermoelectric properties is poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS). The post-treatment of PEDOT:PSS thin films with ionic liquids (ILs) enhances the thermoelectric properties for the practical application by simultaneously improving the inter-domain conductivity and optimizing the charge carrier concentration. Our recent investigation focuses on the influence of the environmental parameters temperature and humidity on the electronic and ionic charge transport properties in the thin films. For this, the thermoelectric films are contacted with a self-built setup in a planar way and inserted into a humidity chamber. By using a potentiostat surface-plane Galvanostatic Electrochemical Impedance Spectroscopy (GEIS) measurements under alternating humidity and temperature can be performed.