Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 65: 2D Materials 2: Growth, Structure and Substrate Interaction
O 65.4: Vortrag
Donnerstag, 8. September 2022, 11:15–11:30, S052
Structural and electronic investigations of CVD-grown TMDs on Au(111) — •Julian Picker1, Maximilian Schaal2, Ziyang Gan1, Marco Gruenewald2, Christof Neumann1, Antony George1, Felix Otto2, Torsten Fritz2, and Andrey Turchanin1 — 1Institute of Physical Chemistry, Friedrich Schiller University Jena, Lessingstraße 10, 07743 Jena, Germany — 2Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany
Transition metal dichalcogenides (TMDs) are layered two-dimensional (2D) materials which have come into the focus of research in recent years. Especially, the exciting change of properties when going from bulk to monolayer make them interesting for novel electronic applications. Here, we demonstrate the ex-situ growth of MoS2 and MoSe2 monolayers on Au(111) by chemical vapor deposition (CVD) in a two-zone furnace. Afterwards, the samples were analyzed in ultra-high vacuum (UHV) with the help of surface sensitive methods, including (low-temperature) scanning tunneling microscopy and spectroscopy (STM/STS), low-energy electron diffraction (LEED) as well as X-ray and angle-resolved ultra-violet photoelectron spectroscopy (XPS/ARPES). While we could confirm the growth of high-quality single crystalline TMDs, we also accessed the structural and electronic properties of these samples down to the atomic scale. Finally, the impact of annealing on the structure and properties of the TMDs was studied.