Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster: Organic Semiconductors
CPP 8.19: Poster
Montag, 14. März 2011, 17:30–19:30, P2
Structure and morphology of organic donor-acceptor photovoltaic cells based on DIP and C60 — •Monika Rawolle1, David Magerl1, Jan Perlich2, Stephan V. Roth2, Andreas Opitz3, Mark Gruber3, Julia Wagner3, Wolfgang Brütting3, and Peter Müller-Buschbaum1 — 1TU München, Physik Department, LS Funkt. Mat., James-Franck-Str. 1, 85748 Garching, Germany — 2HASYLAB at DESY, 22603 Hamburg, Germany — 3Institute of Physics, University of Augsburg, 86135 Augsburg, Germany
A promising candidate for energy conversion utilizing organic semiconductors in small-molecule photovoltaic cells is diindenoperylene (DIP) as a new donor material in combination with the fullerene C60 as an electron acceptor [1].
In this contribution we investigate the influence of substrate temperature on the domain size of thermally evaporated DIP and C60 molecules in planar as well as in bulk heterojunctions. With Grazing-Incidence Small-Angle X-ray Scattering (GISAXS) information on horizontal and vertical structures are obtained. The real space structure information is measured with atomic force microscopy and compared with the reciprocal space investigations. Higher substrate temperatures allow growing of DIP films with higher crystallinity and increasing lateral structure sizes up to several 100 nm which serves as template for crystalline growth of C60 in planar heterojunctions. Even in coevaporated films large lateral structure sizes are observed giving a large scale phase separation.
[1] J. Wagner et al. Adv. Func. Mater. (2010), early view.