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O: Fachverband Oberflächenphysik

O 49: Poster Session - Organic Molecules on Inorganic Substrates: Electronic, Optical and Other

O 49.4: Poster

Dienstag, 17. März 2020, 18:15–20:00, P2/EG

Decoupled or not decoupled? Investigation of charged organic molecules on a 2D insulator — •Maximilian Schaal, Iliyan Karadzhov, Marco Gruenewald, Felix Otto, Roman Forker, and Torsten Fritz — Friedrich Schiller University Jena, Institute of Solid State Physics, Helmholtzweg 5, 07743 Jena

In the last years 2D materials have attracted much interest in fundamental research and practical applications because of their unique physical properties. One representative of the 2D materials is hexagonal boron nitride (h-BN), which is an insulator with a band gap of ≈ 6 eV [1]. h-BN is widely used as interlayer to decouple molecules from metallic surfaces [1]. This lead us to the question: Is one monolayer h-BN really efficient for decoupling PTCDA from the Ni(111) surface?
In this work we observed a charge transfer by differential reflectance spectroscopy (DRS) during the growth of PTCDA. The lateral structure was investigated in real as well as in reciprocal space by scanning tunnelling microscopy (STM) and low energy electron diffraction (LEED), respectively. Furthermore, the core states as well as the valence electron band structure was investigated by x-ray and angle resolved ultraviolet photoelectron spectroscopy (XPS and ARUPS), respectively. In the end we will discuss the origin of the charge transfer.

[ 1 ] W. Auwärter, Surf. Sci. Rep. 74, 1-95 (2018).