Regensburg 2022 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 48: Electrical, Dielectrical and Optical Properties of Thin Films (joint session CPP/KFM)

CPP 48.3: Talk

Friday, September 9, 2022, 12:00–12:15, H38

Improvement of TE properties of PEDOT:PSS films via DMSO addition and DMSO/salt post-treatment resolved from a fundamental view — •Suo Tu¹, Ting Tian¹, Anna-Lena Oechsle¹, Shanshan Yin¹, Xinyu Jiang¹, Wei Cao¹, Nian Li¹, Manuel A. Reus¹, Lennart K. Reb¹, Shujin Hou², Aliaksandr S. Bandarenka², Matthias Schwartzkopf³, Stephan V. Roth³, and Peter Müller-Buschbaum^1,4 — ¹TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching — ²TU München, Physik-Department, Physik der Energiewandlung und -speicherung, 85748 Garching — ³DESY, 22607 Hamburg — ⁴MLZ, TU München, 85748 Garching

The combination of DMSO-solvent doping and physical-chemical DMSO/salt de-doping in a sequence has been used to improve the thermoelectric PEDOT:PSS films. 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.