Berlin 2012 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 24: Poster: Organic Semiconductors
CPP 24.6: Poster
Wednesday, March 28, 2012, 11:00–13:00, Poster A
Structural, morphological and electrical characterization of organic donor-acceptor photovoltaic cells based on diindenoperylene (DIP) and C60 — •Mark Gruber1, Monika Rawolle2, Julia Wagner1, Alexander Hinderhofer3, Andreas Opitz4, David Magerl2, Jan Perlich5, Stephan V. Roth5, Frank Schreiber3, Peter Müller-Buschbaum2, and Wolfgang Brütting1 — 1Institute of Physics, University of Augsburg — 2TU München, Physik Department, Garching — 3Fakultät für Physik, Universität Tübingen — 4Institute of Physics, Humboldt University, Berlin — 5HASYLAB at DESY, Hamburg
Due to a variation of the substrate temperature during film deposition, the structure and morphology of DIP and C60 layers are changed perceptibly. Atomic force microscopy (AFM) images reveal larger lateral grains of both materials for elevated substrate temperatures. With grazing incidence small angle X-ray scattering (GISAXS) measurements we can show that the mean lateral domain distance within the volume of the DIP film increases in the same way as the surface grain size. The vertical domain size of DIP is determined by X-ray diffraction (XRD) measurements, pointing towards coherently ordered domains with a height corresponding to the whole DIP layer thickness. C60 on top of DIP forms domains which are twice as large for an increase of substrate temperature during evaporation from room temperature to 100 ∘C. To demonstrate the effect of enhanced crystallization on planar and planar-mixed organic solar cells, we characterized comparable devices utilizing DIP as donor and C60 as acceptor.