Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 46: 2D Materials beyond Graphene: TMDCs, Slicene and Relatives

O 46.7: Poster

Dienstag, 8. März 2016, 18:15–20:30, Poster E

Structural Analysis of one monolayer hBN on Cu(111) via SPA-LEED and NIXSW — •Christine Brülke¹, Niklas Humberg¹, Timo Heepenstrick¹, Ina Krieger¹, Simon Weiß², Sergey Subach², and Moritz Sokolowski¹ — ¹Institut für Physikalische und Theoretische Chemie der Universität Bonn, Wegelerstraße 12, 53115 Bonn, Germany — ²Peter Grünberg Institut, Forschungszentrum Jülich, 52452 Jülich, Germany

Thin films of hexagonal boron nitride (hBN) are of high interest as an insulating material as well as a template for the formation of highly defined structures of organic molecules. Here, we report a detailed structural analysis of the hBN monolayer on the Cu(111) surface by spot profile analysis low energy electron diffraction (SPA-LEED) and normal incidence x-ray standing waves (NIXSW). hBN grows on the Cu(111) surface in an incommensurate structure with a lattice mismatch of 2.3 % corresponding to an unstrained hBN layer and a domain size of up to 170 Å. The films show rotational mosaicity, however, the majority of the hBN domains are in or close to alignment with the unit cell vectors of the Cu(111) surface. The highly resolved SPA-LEED patterns show detailed structures which can be explained entirely by multiple electron scattering. Both SPA-LEED and NIXSW experiments show that the hBN layer lies topologically flat on the copper surface. The average distance between adsorbate atoms and the first Cu layer is 3.24 ± 0.01 Å. We discuss our results in relation to previous studies.