Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 15: Organic Molecules on Inorganic Substrates II: Electronic, Optical and other Properties

O 15.8: Vortrag

Montag, 18. März 2024, 16:45–17:00, MA 043

Energy level alignment at organic-transition metal dichalcogenide interfaces — •Hibiki Orio¹, Maximilian Ünzelmann¹, Kiana Baumgärtner¹, Christian Metzger¹, Markus Scholz², Kai Rossnagel^2,3, and Friedrich Reinert¹ — ¹Universität Würzburg, Experimentelle Physik VII and Würzburg-Dresden Cluster of Excellence, Würzburg, Germany — ²Deutsches Elektronen Synchrotron DESY, Hamburg, Germany — ³IEAP and KiNSIS, CAU Kiel, Kiel, Germany

The hybrid interface between organic molecules and transition metal dichalcogenides (TMDCs) is characterized by weakly binding van der Waals interactions. In such systems, the interfacial energy level alignment is not in equilibrium and can be modified by external perturbations [1]. Here, we investigate the electronic structure of copper phthalocyanine (CuPc) films grown on different layered materials (graphite, TiSe₂, and WSe₂). Using ultraviolet and x-ray photoelectron spectroscopy, we study in particular the influence of x-ray radiation on the electronic states. We find that the HOMO level is stable in the case of CuPc/graphite, but shifts by 140 meV and 70 meV for TiSe₂ and WSe₂ substrates, respectively. Changes in film morphology and beam damage are subtle and insufficient to explain these different energy shifts.
[1] D. A. Racke, and O. L. A. Monti, Surf. Sci. 630, 136 (2014).

Keywords: CuPc; ARPES; XPS; TMDC