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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Poster Session I

CPP 24.30: Poster

Montag, 16. März 2020, 17:30–19:30, P3

A surface treatment recipe for significantly enhancing thermoelectric PEDOT: PSS films — •Suo Tu and Peter Müller-buschbaum — Physik-Department, Lehrstuhl für Funktionelle Materialien, Physik Department, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany

Organic semiconductors have attracted intense attention because of their potential use in mechanically flexible, lightweight, and inexpensive electronic devices. Especially, PEDOT:PSS is the most studied conducting polymer system due to their intrinsically high electrical conductivity, low thermal conductivity, and high mechanical flexibility in thermoelectric devices. The energy conversion efficiency of a TE material is evaluated by a dimensionless figure of merit ZT. However, it is generally considered that it is difficult to obtain a high ZT value of TE materials, due to the fact that the parameters are interdependence as a function of carrier concentration and hard to be optimized simultaneously. Mostly methods employing film treatment or both film treatment and additives in the solution show better conductivity than the mere additives in the PEDOT:PSS aqueous solution. Herein, a facile multi-step surface treatment was applied to enhance TE properties of pristine PEDOT:PSS thin films. Subsequently, the surface morphology and the inner morphology were probed using atomic force microscopy and grazing-incidence wide/small-angle X-ray scattering, respectively. Additionally, UV-Vis spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy were employed to investigate the mechanism behind for TE performance improvement.