Dresden 2009 – scientific programme
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O: Fachverband Oberflächenphysik
O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)
O 42.111: Poster
Wednesday, March 25, 2009, 17:45–20:30, P2
Reactive Sites for the Deposition of Calcium on Semiconducting Polymers — •Fabian Bebensee1, Jack Hess Baricuatro2, Junfa Zhu3, James Sharp2, Wanda Lew2, Hans-Peter Steinrück1, J. Michael Gottfried1, and Charles T. Campbell2 — 1Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstraße 3, D-91058 Erlangen, Germany — 2Department of Chemistry, University of Washington, Seattle, WA 98195, USA — 3National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, China
Systems composed of semiconducting polymers and low work function metals - used as the cathode - are of great interest in the field of organic electronics, e.g., organic solar cells and organic light emitting diodes. The key parameter in the performance of such devices is the interface between the active polymer and the electrode. We investigated the deposition of calcium on several semiconducting polymers, including CN-MEH-PPV and P3HT, using a set of complementary experimental techniques (ISS, HR-XPS, adsorption microcalorimetry). The focus of this study is on the different adsorption or reaction sites for Ca on the polymer surface and the energetics of the interface formation. The considerable differences in the behavior of the polymers are linked to the presence of different heteroatoms. Support by the DAAD, the NSF, and the Excellence Cluster "Engineering of Advanced Materials" at the University of Erlangen-Nürnberg is gratefully acknowledged.