Dec 7 – 8, 2021 Online only
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Improvement of the thermoelectric properties of PEDOT:PSS films via DMSO addition and DMSO/salt post-treatment resolved from a fundamental view

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Dec 8, 2021, 10:30 AM
1h 30m
Board: P-41
Poster Material Science Poster Session II

Speaker

Suo Tu (Institute of Functional Materials)

Description

The combination of dimethyl sulfoxide (DMSO)-solvent doping and physical-chemical DMSO/salt de-doping in a sequence has been used to improve the thermoelectric (TE) properties of poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) films. A high power factor of ca.105.2 µW m-1 K-2 has been achieved for the PEDOT:PSS film after post-treatment with 10 % sodium sulfite (Na2SO3) in the DMSO/salt mixture (v/v), outperforming sodium bicarbonate (NaHCO3). The initial DMSO-doping treatment induces a distinct phase separation by facilitating the aggregation of the PEDOT molecules. At the same time, the subsequent DMSO/salt de-doping post-treatment strengthens the selective removal of the surplus non-conductive PSS chains. Substantial alterations in the oxidation level, chain conformations, PEDOT crystallites and their preferential orientation are observed upon treatment on the molecular level. At the mesoscale level, the purification and densification of PEDOT-rich domains enable the realization of inter-grain coupling by the formation of the electronically well-percolated network. Thereby, both electrical conductivity and Seebeck coefficient are optimized.

Primary authors

Suo Tu (Institute of Functional Materials) Ting Tian Anna-Lena Oechsle ShanShan Yin (Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany) Xinyu Jiang (Technische Universität München Fakultät für Physik) Wei Cao (TU München) Nian Li (Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany) Manuel Scheel (TUM E13) Lennart Reb (TUM E13) Mr Shujin Hou (Physics of Energy Conversion and Storage, Physik-Department, Technische Universität München) Prof. Aliaksandr Bandarenka (Physics of Energy Conversion and Storage, Physik-Department, Technische Universität München) Matthias Schwartzkopf (DESY) Stephan Roth (DESY / KTH) Peter Müller-Buschbaum (1 Technische Universität München, Fakultät für Physik, Lehrstuhl für Funktionelle Materialien, James-Franck-Str.1, 85748 Garching, Germany 2 Heinz Maier-Leibnitz-Zentrum (MLZ), Technische Universität München, Lichtenbergstr. 1, 85748 Garching, Germany)

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