Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 81: Poster Focus Session: Molecular Nanostructures on Surfaces - New Concepts towards Complex Architectures
O 81.3: Poster
Mittwoch, 14. März 2018, 18:15–20:30, Poster A
Bilayer Formation vs. Monolayer Replacement in Organic Heterostructures: Strong Impact of Subtle Changes in Molecular Structure — •Qi Wang1,2, Antoni Franco-Canellas2, Penghui Ji1, Haiming Zhang1, Alexander Gerlach2, Lifeng Chi1, Steffen Duhm1, and Frank Schreiber2 — 1Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, China — 2Institut für Angewandte Physik, Universität Tübingen, Tübingen, Germany
The electronic structure at the interfaces of copper-phthalocyanine (CuPc) on 6,13-pentacenequinone (P2O) or 5,7,12,14-pentaceneterone (P4O) pre-covered Ag(111) was investigated using ultraviolet photoelectron spectroscopy (UPS), X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM). Despite the similar chemical structure of P2O and P4O, their monolayers on Ag(111) are strikingly different: while P2O is physisorbed, P4O is strongly chemisorbed involving a net electron transfer from the substrate to the adsorbate.[1] Similarly, also CuPc interacts heavily with Ag(111)[2] leading to chemical core-level shifts. By combining our UPS, XPS and STM results for mono- and heterostructures we obtain a full picture of interface energetics and can disentangle competing intermolecular and adsorbatesubstrate interactions.
[1] G. Heimel, et.al. Nat. Chem. 2013, 5, 187.
[2] I. Kröger, et.al. New J. Phys. 2010, 12, 083038.