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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 35: Focus: Polymer Crystallization - from Model Systems to New Materials I

CPP 35.5: Vortrag

Mittwoch, 22. März 2017, 11:15–11:30, ZEU 222

Structural in-operando investigations on PEDOT:PSS electrodes under high humidity conditions — •Lorenz Bießmann¹, Markus Trunk¹, Bo Su¹, Hong Xu¹, Sigrid Bernstorff², and Peter Müller-Buschbaum¹ — ¹TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching, Germany — ²Elettra-Sincrotrone Trieste, 34149 Basovizza, Italy

Towards flexible substrates for organic light emitting diodes and organic photovoltaics it is of significant interest to get rid of brittle, costly electrodes like ITO or FTO as well. PEDOT:PSS offers with its good conductivity, easy processibility, and inherent flexibility a suitable alternative to its rigid and transparent conducting oxide counterparts. The crystallinity as well as orientation of crystals in PEDOT:PSS films is known to have a significant influence on the film conductivity. In particular, the appearance of water in air can cause oxidation and thus decrease the device efficiency or cause device failures. Therefore, we investigate changes of the crystal structure of spray-deposited PEDOT:PSS films under high humidity conditions. We monitor changes in crystallinity and orientation of crystals with in-operando grazing incidence wide angle x-ray scattering (GIWAXS). The variation of conductivity of PEDOT:PSS is linked to the GIWAXS findings. Furthermore, reversibility is studied.