SKM 2021 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 5: Poster Session I

CPP 5.2: Poster

Tuesday, September 28, 2021, 17:30–19:30, P

Uncovering the enhancement mechanisms of thermoelectric performance of PEDOT: PSS films after physical-chemical dedoping — •Suo Tu, Ting Tian, Anna-Lena Oechsle, 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 (TE) devices. It is generally acknowledged that it is difficult to achieve a high ZT value of TE materials, due to the fact that the interdependence of parameters as a function of charge carrier concentration. In this work, we adopt a combination of DMSO addition and subsequent DMSO/salt mixture post-treatment to improve the TE performance of PEDOT: PSS thin films. Results show that the as-obtained PEDOT: PSS film presents a maximum PF of 105.2 *W(m-1K-2), which is ~1750-fold leap larger than that of pristine film. The origin and mechanism of the underlying improvement are systematically investigated by various characterizations to gain a more profound understanding of the fundamental nature of the modified PEDOT: PSS films.