Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 19: Poster Monday: Organic Molecules on Inorganic Surfaces
O 19.8: Poster
Montag, 1. April 2019, 17:45–20:00, Poster F
Quantitative Determination of a Model Organic/Insulator/Metal Interface Structure — Martin Schwarz1, David A. Duncan2, Manuela Garnica1, Jacob Ducke1, Aleksandr Baklanov1, Peter S. Deimel1, Johannes Küchle1, Pardeep K. Thakur2, Tien-LIn Lee2, Francesco Allegretti1, and •Willi Auwärter1 — 1Technical University of Munich, Germany — 2Diamond Light Source, U.K.
Two-dimensional epitaxial materials including hexagonal boron nitride (hBN) are frequently employed as templates for self-assembled molecular films and nanostructures [1]. A quantitative structural characterization of the respective interfaces and adsorbate geometries however is largely missing. Here, we report on the geometric and electronic structure of a prototypical organic/insulator/metal interface, namely metallo-porphines (Co-P, Zn-P) on monolayer hBN on Cu(111), investigated by combining X-ray photoelectron spectroscopy, X-ray standing waves and scanning tunneling microscopy [2]. Specifically, we determine the adsorption height of the organic molecules and show that the original planar molecular conformation is preserved in contrast to the adsorption of Co-P on Cu(111) [3]. In addition, we highlight the electronic decoupling provided by the hBN spacer layer and find that the hBN-metal separation is not significantly modified by the molecular adsorption.
[1] W. Auwärter, Surf. Sci. Rep., doi:10.1016/j.surfrep.2018.10.001
[2] M. Schwarz, et al., Nanoscale 10, 21971 (2018)
[3] M. Schwarz, et al., J. Phys. Chem. C 122, 5452 (2018)