Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 55: Poster Wednesday: Organic Molecules at Surfaces 2
O 55.12: Poster
Mittwoch, 7. September 2022, 18:00–20:00, P4
Anchoring p-terphenyl-based thiols to top-layer sulphur defects on MoS2/Au(111) — J. Rika Simon1, Dmitrii Maksimov2, •Juan Pablo Guerrero Felipe1, Paul Wiechers1, Christian Lotze1, Ana M. Valencia3,4, Caterina Cocchi3,4, Björn Kobin4, Stefan Hecht4, Mariana Rossi2, and Katharina J. Franke1 — 1Freie Universität Berlin, Germany — 2MPI for the Structure and Dynamics of Matter, Hamburg, Germany — 3Carl von Ossietzky Universität Oldenburg, Germany — 4Humboldt-Universität zu Berlin, Germany
Systems consisting of transition metal dichalcogenides (TMDCs) and organic molecules is a field gathering much interest in recent years. By using a scanning tunneling microscope (STM), it is possible to explore these systems in detail, where the TMDC layer works as a decoupling layer between the adsorbate and metal substrate. In our experiments, we investigate a monolayer of MoS2 on Au(111) where interesting results occur once a sulphur defect on the top-layer is created. It gives rise to a localized resonance around the Fermi energy, not present in pristine MoS2. Here we show experimental and theoretical comparisons where the thiol-based molecule CF3-3P-SH (4”-(trifluoromethyl)-[1,1’:4’,1”-terphenyl]-4-thiol) is anchored to a sulphur top-layer defect, creating a chemical bond between the molecule and MoS2. We observe a characteristic Kondo resonance due to the interaction between molecule and substrate. Additionally, we have mapped out the spatial distribution of the electronic states as well as explored the vibronic states of the molecule.