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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 42: Poster Tuesday: Organic Molecules on Inorganic Surfaces

O 42.10: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Orbital Imaging of Pentacene Bilayers on Ag(110) — •Kiana Baumgärtner1, Manuel Grimm1, Christian Metzger1, Martin Graus1, Matteo Jugovac2, Giovanni Zamborlini2, Vitaliy Feyer2, Achim Schöll1, and Friedrich Reinert11Julius-Maximilians-Universität Würzburg, Experimental Physics VII, 97074 Würzburg, Germany — 2Forschungszentrum Jülich GmbH, Peter Grünberg Institut (PGI-6), 52425 Jülich, Germany

Pentacene, a planar organic molecule being widely used in organic electronic devices, is known to form well-ordered single layers when evaporated atop Ag(110). Due to substrate-molecule interactions, the molecules of the first layer will align themselves flat-lying and commensurately along the [001] direction of the substrate. When adding a second layer of molecules, the orientation of growth is increasingly determined by intermolecular forces resulting in a tilt angle of the first layer away from the substrate surface and an even larger tilt angle in the second layer. To evaluate the exact angles of the individual layers, photoelectron momentum maps were recorded with a photoemission electron microscope in k-space imaging mode (kPEEM) at a synchrotron radiation source. The obtained momentum maps contain information on the orientation of the investigated orbital and thus, a comparison of the experimental data with simulated intensity distributions for different sample geometries allowed for a verification of the tilt angle with an accuracy of about 1°.

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