Regensburg 2007 – scientific programme

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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices

SYOE 8: Poster Session SYOE

SYOE 8.37: Poster

Tuesday, March 27, 2007, 18:00–20:00, Poster B

Interface Morphology Snapshots of Vertically Segregated Thin Films of Semiconducting Polymer / Polystyrene Blends — •Jakob Heier¹, Fernando Castro², and Roland Hany¹ — ¹Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for Functional Polymers, Dübendorf, Switzerland — ²Departamento de Física e Matemática, Universidade de São Paulo, Ribeirão Preto, Brazil

Significant progress has been made in the photovoltaic energy conversion using organic semiconducting materials. One of the focuses of attention is the morphology of the donor-acceptor heterojunction at the nanometer scale, to ensure efficient charge generation and loss-free charge transport at the same time. Here, we present a method for the controlled, sequential design of a bilayer polymer cell architecture that consists of a large interface area. We used surface-directed demixing of a donor conjugated/guest polymer blend during spincoating to produce a nanostructured interface, which can, after removal of the guest polymer with a selective solvent, be covered with an acceptor layer. Our experimental results indicate that length-scales of interface topographical features can be adjusted from the nanometer to micrometer range.