Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 38: Organic Molecules on Inorganic Substrates II: Electronic Properties and Charge Transfer
O 38.5: Vortrag
Dienstag, 2. April 2019, 15:00–15:15, H24
Electronic decoupling of PTCDA by a single layer of hexagonal boron nitride on Cu(111) — •Christine Brülke1, Timo Heepenstrick1, Ina Krieger1, Beatrice Wolff1, Xiaosheng Yang2, Ali Shamsaddinlou2, Simon Weiß2, Francois C. Bocquet2, F. Stefan Tautz2, Serguei Soubatch2, and Moritz Sokolowski1 — 1Universität Bonn, Institut für Physikalische und Theoretische Chemie, 53115 Bonn, Germany — 2Forschungszentrum Jülich, Peter Grünberg Institut (PGI-3), 52425 Jülich, Germany
Hexagonal boron nitride (hBN) has previously been investigated regarding its function as a template for organic molecules as well as its ability to decouple them from an underlying metal substrate. We report on the ability of hBN to decouple the model molecule PTCDA from a Cu(111) substrate using structural and spectroscopic methods and present quantitative data that characterize the adsorption complex. SPA-LEED and STM investigations show that the lateral structure of the monolayer conforms to the (102) planes of the bulk configurations within less than 4%. NIXSW experiments reveal that the molecules are positioned at a large distance of 3.38 Å above the surface with a very small distortion out of the molecular plane by only 2.6%. Furthermore, photoelectron spectroscopy (XPS, UPS) shows that there is no hybridization of molecular and metal states. All of these features differ significantly from those found for PTCDA on metal surfaces. The electronic decoupling of the PTCDA molecule from the metal substrate is further proven by the non-vanishing fluorescence yield of the monolayer because otherwise mixing of electronic states leads to quenching.