Dresden 2009 – wissenschaftliches Programm
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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices
SYOP 1: Organic Photovoltaics I
SYOP 1.3: Vortrag
Mittwoch, 25. März 2009, 14:30–14:45, ZEU 222
Molecular semiconductor blends: microstructure, charge carrier transport and application in photovoltaic cells — •Andreas Opitz1, Julia Wagner1, Bernhard Ecker1, Wolfgang Brütting1, Alexander Hinderhofer2, and Frank Schreiber2 — 1Institute of Physics, University of Augsburg, Germany — 2Institute of Applied Physics, University of Tübingen, Germany
Blends of organic donor and acceptor materials have the potential of an increase of solar cell efficiency. However, the balance between charge carrier transport in phase-separated structures and exciton dissociation at the donor-acceptor interface has to be optimized. To analyze this relation in more detail the following molecular material combinations were investigated: (i) Copper phthalocyanine (CuPc) combined with fullerene C60 and (ii) CuPc in combination with perfluorinated CuPc (F16CuPc).
Measurements by X-ray diffraction and scanning force microscopy indicate the formation of phase-separated nanocrystals for blends of CuPc/C60 and the formation of mixed crystals in the CuPc/F16CuPc system. The formation of mixed crystals is an interesting feature for organic blends which has not yet been explored in organic solar cells. We will discuss the implications of the different molecular arrangements on the optical and electrical properties as well as for the solar cell performance.