Dresden 2017 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 50: Poster: Organic Electronics and Photovoltaics, Molecular Excitations
CPP 50.2: Poster
Mittwoch, 22. März 2017, 18:30–21:00, P3
Self-organization of liquid spread polymers for organic photovoltaics studied by 2d polarization microscopy — •Daniela Täuber1, Wanzhu Cai2, Olle Inganäs2, and Ivan Scheblykin1 — 1Chemical Physics, Lund University, Lund, Sweden — 2Biomolecular and Organic Electronics, Linköping University, Linköping, Sweden
Large-area self-assembly of functional conjugated polymers holds a great potential for practical applications of organic electronic devices. We obtain well aligned films of poly[2,3-bis(3-octyloxyphenyl)quinoxaline-5,8-diyl-alt-thiophene-2,5-diyl] (TQ1) by the floating film transfer method. Thereby, a droplet of a TQ1 solution is injected on top of the surface of a immiscible liquid substrate, at the meniscus formed at the edge of a Petri dish, from where the polymer solution and film then spreads in one direction. Characterization of the TQ1 film by the recently developed two-dimensional polarization imaging (2D POLIM) reveals large, mm sized domains of oriented polymer chains. The irregular shape of the contact line at the droplet source induced the appearance of disordered stripes perpendicular to the spreading direction. A correlation of polarization parameters measured by 2D POLIM revealed the microstructure of such stripes, providing valuable information for further improvement and possible upscaling of this promising method.