Berlin 2015 – scientific programme
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DS: Fachverband Dünne Schichten
DS 18: Interfaces and Thin Films II (joint session with CPP)
DS 18.6: Talk
Tuesday, March 17, 2015, 15:30–15:45, C 243
Conjugated diblock copolymer/fullerene bulk heterojunction system in organic photovoltaic application — •Rui Wang1, Zhenyu Di1, Henrich Frielinghaus1, Peter Müller-Buschbaum2, and Dieter Richter1 — 1Jülich Center for Neutron Science, outstation at FRM II, Lichtenbergstr. 1, 85747 Garching — 2TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching
In order to achieve an optimum energy conversion efficiency for polymer based organic solar cells an interpenetrating bulk heterojunction (BHJ) network is needed, which has a nanoscale morphology on the order of the exciton diffusion length. The interpenetrating network provides larger interface area for exciton dissociation as well. Diblock copolymers are very promising for achieving well controlled nanoscale morphologies. In the present work, we blend the conjugated diblock copolymer P3HT-b-PS with the fullerene derivative PCBM. By applying grazing incidence small angle neutron scattering (GISANS) we investigate the active layer, GISANS had proven to give good contrast conditions for polymer:PCBM films in previous investigations. We present the determined structures in terms of phase information, size of structural length scales and molecular miscibility between the components.