Berlin 2012 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 18: Organic semiconductors I

CPP 18.1: Talk

Wednesday, March 28, 2012, 09:30–09:45, C 130

Solvent induced morphology in polymer-based systems for organic photovoltaics — Matthias A. Ruderer¹, Shuai Guo¹, Robert Meier¹, Hsin-Ying Chiang¹, Volker Körstgens¹, Jan Perlich², Stephan V. Roth², and •Peter Müller-Buschbaum¹ — ¹TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching, Germany — ²HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany

In this investigation we probe the influence of the used solvent on the morphology formation of polymer-based bulk heterojunction systems for photovoltaic applications. Films are spin coated from different solvents. We chose the bulk heterojunction system consisting of the conjugated polymer P3HT (poly(3-hexylthiophene-2,5-diyl)) and the methano fullerene PCBM. Both components fit very well concerning their electronic behaviors and this combination is probably the best investigated system in organic photovoltaics so far. Besides imaging methods such as atomic force microscopy (AFM), the advanced scattering techniques X-ray reflectivity and grazing incidence small and wide angle X-ray scattering (GISAXS and GIWAXS) reveal a full understanding of the inner film structure on molecular to mesoscopic length scales. In combination with topography imaging we are able to reconstruct schematic morphologies from the scattering experiments for the films made from the different solvents. Depending on the solvent, enrichment layers at the interfaces as well as varying structural length scales inside the active layer are found [Adv. Funct. Mater. 21, 3382-3391 (2011)].