Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 42: Poster Tuesday: Organic Molecules on Inorganic Surfaces

O 42.6: Poster

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

Electronic Structure of decoupled molecules: 1,2;8,9-dibenzopentacene on h-BN on Pt(111) — •Maximilian Schaal, Felix Otto, Bernd Schröter, Roman Forker, and Torsten Fritz — Friedrich Schiller University Jena, Institute of Solid State Physics, Helmholtzweg 5, 07743 Jena

The strong hybridisation of molecules on metal single crystals causes a strong change of the structural and electronic proporties. Insulating interlayers like 2D hexagonal boron nitride (h-BN) can be used to study the undisturbed properties of decoupled molecular layers. For this purpose we studied the change of the electronic structure of 1,2;8,9-dibenzopentacene (trans-DBPen) molecules upon adsorption on h-BN/Pt(111). The h-BN monolayer was grown by thermal dehydrogenation of borazine on Pt(111). The layer quality was determined by x-ray photoelectron diffraction (XPD) and low energy electron diffraction (LEED). The thickness of the trans-DBPen layer was controlled by in-situ differential reflectance spectroscopy (DRS). The electronic structure of this organic-inorganic heterostructure was observed with ultraviolet and x-ray photoelectron spectroscopy (UPS and XPS) and compared to the electronic structure of bare h-BN on Pt(111) and trans-DBPen directly on Pt(111). By measuring the band structure it was possible to identify several molecular states. Furthermore, the highest occupied molecular orbital (HOMO) was investigated by measuring the photoelectron momentum maps (PMMs). Finally the results show the desired effect of decoupled trans-DBPen molecules on h-BN/Pt(111).