SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 22: Poster Session: Organic Molecules on Inorganic Substrates I

O 22.9: Poster

Montag, 27. März 2023, 18:00–20:00, P2/EG

Charge Transfer on a 2D Insulator: Influence of the Molecular Functionalzation — •Maximilian Schaal, Jonas Brandhoff, Felix Otto, Roman Forker, and Torsten Fritz — Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany

2D materials like hexagonal boron nitride (h-BN) are widely used as interlayer to decouple organic molecules from metallic surfaces. Despite the large band gap of 2D h-BN of ≈ 6 eV, there are also indications for a possible charge transfer into organic molecules. This raises the question: What is the reason for the charge transfer on this 2D insulator?
To address this question, we systematically studied the influence of the molecular functionalization on the lateral structure as well as on the charge transfer on 2D h-BN grown by chemical vapor deposition on Ni(111). Therefore, we compare the structural and electronic properties of pentacene (Pen) monolayers with the oxo-derivatives 6,13-pentacenequinone (P2O) and 5,7,12,14-pentacenetetrone (P4O) by using low energy electron diffraction (LEED), differential reflectance spectroscopy (DRS), X-ray and ultraviolet photoelectron spectroscopy (XPS and UPS) as well as photoemission orbital tomography (POT). For P4O on h-BN/Ni(111) we observed a charge transfer while Pen and P2O remain neutral. This will be discussed in terms of energy-level alignment in these 2D organic/inorganic heterostructures.