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CeNS Colloquium

Place: Kleiner Physik-Hörsaal, Geschwister-Scholl-Platz
Date: 22.10.10, Time: 15:30 h

Polymer- and hybrid-nanostructures for applications in organic photovoltaics

Prof. Peter Müller-Buschbaum
Technische Universitaet Muenchen, Lehrstuhl für Funktionelle Materialien

 

Conducting photoactive polymers offer fascinating new possibilities with respect to energy research applications such as photovoltaics (PV). In the organic photovoltaics (OPV) approach hybrid systems as well as full polymer systems are studied. In a hybridsystem typically the p-type conducting polymer is in contact with a metal oxide as for example titania. In full polymer systems both parts of the thin film, the n- and p-type material, are made from such conjugated polymers. For both types of PV systems, the tailoring of the interface morphology between n- and p-type materials is essential. The small exciton diffusion length in conducting polymers causes a need for domain sizes on that scale. Grazing incidence small and wide angle scattering (GISAXS and GIWAXS) allow for a determination of this inner (bulk film) structure, which is the essential key for tailoring morphologies. In OPV model systems the tailoring of titania morphology [1], the influence of blend ration [2] and post production treatments [3] on both, device performance and morphology, are discussed.

[1] Kaune, Müller-Buschbaum et al.; ACS Appl. Mater. Interfaces 1, 2862-2869 (2009)
[2] Ruderer, Müller-Buschbaum et al.;Chem. Phys. Chem. 10, 664-671 (2009)
[3] McNeill, Müller-Buschbaum, et al.; Adv. Funct. Mat. 19, 3103-3111 (2009)