Berlin 2018 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 14: Interfaces and Thin Films I
CPP 14.3: Talk
Monday, March 12, 2018, 15:30–15:45, C 264
Monitoring the Swelling Behavior of PEDOT:PSS Electrodes under High Humidity Conditions — •Lorenz Bießmann1, Lucas Philipp Kreuzer1, Tobias Widmann1, Nuri Hohn1, Jean-François Moulin2, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching — 2HZG at MLZ, 85748 Garching
One main advantage of organic electronics is the enabling of building flexible electronic devices. The polymer mixture poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) offers good electrical conductivity, transparency and inherent flexibility, which makes it to a promising alternative to rigid and brittle transparent electrodes like indium tin oxide (ITO). By different treatment methods it is possible to adjust the conductivity and work function of PEDOT:PSS to its desired requirements. The hygroscopic behavior of the PSS component yields a high potential for water uptake of the PEDOT:PSS. This is known to have a negative influence on its electronic conductivity. Furthermore, an increasing film thickness due to water uptake may lead to mechanical stress on the other functional layers in the organic device. Hence, we investigate the PEDOT:PSS thin films regarding their swelling behavior under high humidity conditions, using in-situ time of flight neutron reflectivity (TOF-NR) measurements. Two commonly used PEDOT:PSS treatments are compared to pristine PEDOT:PSS. We observe a strong dependence of water uptake and thickness evolution on the type of PEDOT:PSS treatment.