Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)
O 41.32: Poster
Dienstag, 23. März 2010, 18:30–21:00, Poster B1
Effects of Electron Irradiation on the Composition, Energetics and Structure of the Calcium/Poly(3-Hexylthiophene) (P3HT) Interface — •F. Bebensee1, J. F. Zhu2, J. H. Baricuatro3, J. A. Farmer3, H.-P. Steinrück1, C. T. Campbell3, and J. M. Gottfried1 — 1Universität Erlangen-Nürnberg, Lehrstuhl für Physikalische Chemie II — 2University of Science and Technology of China — 3University of Washington, Department of Chemistry
Energetics, composition and structure of Ca deposited on the π-conjugated polymer P3HT was studied with adsorption microcalorimetry, atomic beam/surface scattering, ion scattering spectroscopy and high-resolution XPS. Ca/P3HT is prototypical for interfaces between low work-function metals and semiconducting polymers, which are typically found in organic photovoltaic devices. The interface properties often play a crucial role with respect to the device performance, e.g. charge injection rates depend on the overlap of wave functions at the interface. Despite its outstanding importance, only little is known about the interface formation in these systems beyond their morphologies. Here, we extend our previous studies of Ca on pristine P3HT surfaces and present new results on the influence of electron irradiation (Ekin=100 eV) on the interface formation. While the adsorption energy of Ca remains unaltered, the sticking probability increases dramatically. This effect is related to changes in the C 1s XP spectra and, by comparison with results for pristine P3HT, provides a detailed mechanistic understanding of the impact of electron irradiation.