Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 29: [CPP] Organic Electronics and Photovoltaics I (Joint Session DS/CPP/HL/O)
O 29.12: Vortrag
Dienstag, 23. März 2010, 12:30–12:45, H37
Fully functionalized block copolymers for organic electronic applications — •Sven Hüttner1,2, Michael Sommer2, Justin Hodgkiss1, Peter Kohn3, Thomas Thurn-Albrecht3, Richard Friend1, Ullrich Steiner1, and Mukundan Thelakkat2 — 1Cavendish Laboratory, University of Cambridge — 2Angewandte Funktionspolymere, Makromolekulare Chemie I, Universität Bayreuth — 3Experimentelle Polymerphysik, Universität Halle-Wittenberg
Block copolymers are well known to phase separate in highly ordered nanostructures on length scales commensurate with the exciton diffusion length. We use fully functionalized block copolymers for photovoltaic devices, where a donor and an acceptor polymer are covalently linked. The acceptor block consists of a polyacrylate backbone with pendant perylene bisimide moieties and the donor block consists of poly(3-hexylthiophene) (P3HT). We combine temperature dependent small angle and wide-angle X-ray scattering measurements to investigate the block copolymer phase separation as well as the influence of the crystallisation kinetics of the two blocks. Intermolecular and intramolecular interactions drive the self-assembly of structures from molecular lengthscales to larger mesostructures of some nanometers to microphase separation of some tens of nanometers. The investigation of the morphology is accompanied by steady state spectroscopy and transient absorption spectroscopy. Furthermore organic thin film transistors are used to characterize the transport properties in these novel materials which are found to exhibit unique properties such as the tunability between n-type, p-type or ambipolar transport.