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O: Fachverband Oberflächenphysik
O 79: 2D Materials V: Growth, Structure and Substrate Interaction
O 79.2: Vortrag
Donnerstag, 21. März 2024, 10:45–11:00, MA 005
Janus SeMoS monolayers grown by chemical vapor deposition on Au(111) — •Julian Picker1, Mahdi Ghorbani-Asl2, Maximilian Schaal3, Silvan Kretschmer2, Felix Otto3, Marco Gruenewald3, Christof Neumann1, Antony George1, Torsten Fritz3, Arkady Krasheninnikov2, and Andrey Turchanin1 — 1Institute of Physical Chemistry, Friedrich Schiller University Jena — 2Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf — 3Institute of Solid State Physics, Friedrich Schiller University Jena
Janus transition metal dichalcogenide monolayers (TMD MLs) are asymmetric two-dimensional (2D) crystals consisting of two different chalcogens on their opposite faces. Their unique structure results in the in-built electric dipole and leads to new physical phenomena compared to conventional TMD MLs such as MoS2 or MoSe2. Here we report an epitaxial growth of Janus SeMoS MLs on Au(111) by chemical vapor deposition. In the growth process, sulfur atoms intercalate between the MoSe2 ML and Au(111) resulting in the exchange of the bottom selenium layer with sulfur [1]. We studied the structure of the formed Janus SeMoS MLs by scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED). The electronic structure was characterized by angle-resolved photoelectron spectroscopy (ARPES). Density functional theory (DFT) calculations demonstrate a good agreement with the experimental findings.
[1] Z. Gan et al., Adv. Mater. 34, 2205226 (2022).
Keywords: TMDs; 2D materials; STM; ARPES; CVD