Regensburg 2022 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 31: Electrical, Dielectrical and Optical Properties of Thin Films (joint session CPP/KFM)

KFM 31.2: Talk

Friday, September 9, 2022, 11:45–12:00, H38

In-situ investigations of morphology degradation and oxidation level changes in EMIM DCA post-treated PEDOT:PSS thin films upon external influence — •Anna Lena Oechsle¹, Julian E. Heger¹, Nian Li¹, Shanshan Yin¹, Sigrid Bernstorff², and Peter Müller-Buschbaum^1,3 — ¹TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching — ²ELETTRA, 34149 Basovizza TS, Italy — ³MLZ, TU München, 85748 Garching

Nowadays thermoelectric generators are considered a promising technique for heat waste recovery as they enable a direct conversion of a temperature gradient into electrical power. Especially, organic thermoelectric polymers are attractive, owning some advantages like low cost, lightness and high mechanical flexibility, low or no toxicity, as well as a usually low thermal conductivity. In our work we show the positive effect of ionic liquid (IL) treatment on the thermoelectric properties, Seebeck coefficient and electrical conductivity, of semi-conducting PEDOT:PSS thin films. Furthermore with different in-situ experiments like GISAXS (grazing incidence small angle x-ray scattering), UV-Vis, and conductivity measurements we examine the inner film morphology and oxidation level changes upon operation at different ambient conditions.