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SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 18: Poster: 2D Materials I

O 18.7: Poster

Montag, 27. März 2023, 18:00–20:00, P2/EG

Evolution of Band structure in 2D transition metal dichalcogenides alloy MoxW1−xSe2 — •Sarath Sasi1, Laurent Nicolaï1, Lucie Nedvědová1, Rostislav Medlín1, Michal Procházka1, Marie Netrvalová1, Sunil Wilfred Dsouza1, Christine Richter2,3, Karol Hricovini2,3, and Ján Minár11New Technologies Research Centre, University of West Bohemia, Pilsen, Czech Republic — 2LPMS, CY Cergy Paris Université, Neuville-sur-Oise, France — 3Université Paris-Saclay, CEA, CNRS, LIDYL, Gif-sur-Yvette, France

Among two-dimensional (2D) materials that emerged in the research scenario after the discovery of graphene, transition metal dichalcogenides (TMDCs) with the general formula MX2 (M=Mo, W; X=S, Se, Te) attract huge interest as a potential candidate for electronic and optoelectronic applications. There are many artificial methods to engineer the bandgap and spin-polarized bands, such as chemical doping, external electric field etc. Here we are studying the band structure of MoxW1−xSe2 single crystals alloy with various stoichiometric ratio x in comparison with WSe2. The structural characterisation of samples was analysed using Low energy electron diffraction, Raman Spectroscopy and Scanning Electron Microscopy with Energy Dispersive X-Ray Analysis, X-ray photoemission spectroscopy(XPS). Angle-Resolved Photoemission Spectroscopy (ARPES) was used to investigate the electronic band structure of the samples. We evaluated the band dispersion and observed the bands’ splitting at the K point. Thus we are evaluating a potential way for band engineering in TMDCs.

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