Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 63: 2D Materials beyond Graphene
O 63.3: Poster
Mittwoch, 18. März 2015, 18:15–21:00, Poster A
Structural Analysis of MoS2 on Au(111) by X-ray Standing Waves — •caio silva1, ferdinand farwick zum hagen1, wouter jolie1, christoph schlueter2, tien-lin lee2, and carsten busse1 — 1II. Physikalisches Institut, Universität zu Köln, Germany — 2Diamond Light Source, United Kingdom
The present work clarifies important aspects of the structure of MoS2 epitaxially grown on Au(111) by physical vapor deposition. The results are very significant to understand the interaction between transition-metal dichalcogenides (TMDCs) and metallic substrates. TMDCs present fascinating electronic, optical and catalytic properties. Remarkable differences are found in the single-layered TMDCs in contrast to the bulk material, e. g. transition from indirect to direct band gap and spin-orbit-induced spin splitting due to the symmetry loss. Determination of the structure down to the atomic level is crucial in understanding the correlation between these properties and the morphology.
X-ray standing waves (XSW) has been used to study the average distances between the single-layer S-Mo-S to substrate surface. Chemical analysis was performed by means of high-resolution x-ray photoelectron spectroscopy (XPS) and low-energy electron diffraction (LEED) was used to elucidate the sample quality and the in-plain structure of MoS2/Au(111).