Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 32: Poster Session - Organic Molecules on Inorganic Substrates: Adsorption and Growth

O 32.2: Poster

Monday, March 16, 2020, 18:15–20:00, P1C

Comparison of Donor-Acceptor Coupling Strength with Chemisorption on Different Metal Substrates — •Qi Wang, Antoni Franco-Cañellas, Alexander Gerlach, and Frank Schreiber — Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany

As crucial element in opto-electronic devices heterostructures are of pivotal importance. Here, we present a comprehensive study on the properties of a donor-acceptor (D-A) bilayer structure using X-ray photoelectron spectroscopy (XPS) and normal-incidence X-ray standing wave (NIXSW) measurements. Accordingly, an acceptor material-pentacene (PEN) and a donor material-perfluoropentacene (PFP) are chosen to build bilayer structures. PFP/PEN bilayers have been grown on Au(111) and Cu(111) substrates, i.e., coinage metal surfaces with different reactivity. By comparing the adsorption behavior of pentacene and its perfluorinated partner, we found that: i) on Au(111), the first layer (PEN) is physisorbed, whereas on Cu(111) the molecule-substrate interaction is much stronger, ii) the D-A bonding distances indicate that within the bilayer van-der-Waals interactions dominate.