Berlin 2008 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 35: Nanostructured block copolymer films (SYSA 8)
DS 35.2: Vortrag
Donnerstag, 28. Februar 2008, 17:30–17:45, H 2032
Morphological control in organic electronic devices using semiconductor block copolymers — •Sven Hüttner1, 2, Michael Sommer2, Ullrich Steiner1, and Mukundan Thelakkat2 — 1Cavendish Laboratory, University of Cambridge, UK — 2Angewandte Funktionspolymere, Universität Bayreuth, Germany
Morphology plays a key role in organic electronic devices. In organic solar cells, for example, one important parameter is the creation of a large donor-acceptor interface for efficient charge separation while providing charge transport pathways to the respective electrodes at the same time. We address this issue by combining the concept of block copolymer self-assembly with functional polymers providing light absorption, hole transport and electron transport.
The presented block copolymer consists of an electron conducting block which is featured by a perylene bisimide derivative and a second block which is either featured by polystyrene or a hole conducting block such as polymerized triphenylamine derivatives. By applying different annealing methods, like the controlled exposure to solvent vapour, we can achieve highly ordered, self-assembled nanostructures of the two components with some tens of nanometers in scale. This is decisive for polymer photovoltaic devices.
Furthermore we have investigated these novel perylene bisimide based block copolymers and homopolymers in organic field effect transistors. The material shows excellent n-type properties with electron mobilities in the order of 103cm2/Vs and threshold voltages as low as 5V could be achieved.