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O: Fachverband Oberflächenphysik

O 5: Organic-Inorganic Hybrid Systems and Organic Films I

O 5.3: Vortrag

Montag, 20. März 2017, 11:00–11:15, WIL A317

Photoemission Tomography of NiTPP on Cu(100) — •Daniel Lüftner¹, Giovanni Zamborlini², Zhijing Feng³, Carlo Dri³, Vitaly Feyer², and Peter Puschnig¹ — ¹Institut für Physik, Universität Graz, 8010, Graz, Austria — ²Peter Grünberg Institut (PGI-6), Forschnungszentrum Jülich GmbH, 52425, Jülich, Germany — ³CNR-IOM Laboratorio Nazionale TASC, 34012 Trieste, Italy

In this work we present a comprehensive characterization of the geometrical and electronic structure of self assembled Nickel-tetraphenylporphyrin (NiTPP) films on Cu(100) utilizing various experimental techniques, supported by theoretical calculations using density functional theory (DFT). In particular we make use of scanning tunneling microscopy (STM), low energy electron diffraction (LEED) and photoemission tomography (PT), where the results of angle resolved photoemission spectroscopy (ARPES) measurements are systematically compared to the Fourier Transform of molecular orbitals, obtained in DFT. On the basis of STM and LEED measurements, we find, that NiTPP can arrange in two different geometrical configurations. In terms of electronic structure, PT allows for a direct assignment of peaks in the angle integrated ARPES spectrum to individual molecular orbitals and as such we observe a strong interaction of NiTPP with the metallic substrate resulting in occupation of LUMO/LUMO+1 and the LUMO+3 of the gas phase molecule. Our work emphasizes that a multi technique approach is essential in order to have a complete picture of the adsorption behavior and electronic properties of the metal/molecule interface.