A5004469938- Surface and Thin Film Phenomena
- Molecular Junctions and Nanostructures
- Graphene research and applications
- Advanced Chemical Physics Studies
- Quantum and electron transport phenomena
- Nanowire Synthesis and Applications
- Force Microscopy Techniques and Applications
- 2D Materials and Applications
- Semiconductor materials and devices
University of Bonn
2017-2023
The hexagonal boron nitride (hBN) monolayer on the Cu(111) surface has recently been considered an example of extremely weak hBN/metal interaction, as indicated, e.g., from presence only electronic Moiré-like superstructure that was observed in scanning tunneling microscopy images. From these results, a large bonding distance hBN sheet to topmost Cu layer can be envisaged but not proven so far. We report structural analysis hBN/Cu(111) interface based high resolution low energy electron...
Electronic surface hardening induced by oxygen atoms deposited on Cu(100) results in a true electronic and physical decoupling of adsorbed organic molecules.
The adsorption geometry, namely the height and site, of 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) on Cu(100) surface was determined by normal incidence x-ray standing wave (NIXSW) technique including triangulation. two PTCDA molecules in superstructure unit cell, which have perpendicular azimuthal orientation, are both located at bridge sites, long molecular axis being parallel to bridge. Carboxylic oxygen atoms several carbon backbone close on-top positions. vertical distortion...
The adsorption geometry, the electronic properties, and energy of prototype organic molecule 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) on a monolayer hexagonal boron nitride (hBN) grown Cu(111) surface were determined experimentally. perylene core is at large height 3.37 $\AA{}$ only minute downward displacement functional anhydride groups (0.07 \AA{}) occurs, yielding heights that agree with sum involved van der Waals radii. Thus, already single hBN layer leads to decoupled...
We present an experimental and theoretical analysis of the core-level binding energy shifts in metal-supported ultrathin potassium chloride (KCl) films, i.e., a case from broader class few-atom-thick, wide-band gap insulating layers that is increasingly used nanosciences nanotechnologies. Using synchrotron-based high-resolution photoemission spectroscopy (HRPES) measurements, we identify different contributions to for Cl– anions K+ cations two three atomic layer-thick KCl films grown on...