Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 46: 2D Materials beyond Graphene: TMDCs, Slicene and Relatives

O 46.5: Poster

Dienstag, 8. März 2016, 18:15–20:30, Poster E

Structure and Electronic Properties of MoS₂ on Au(111) — •Nils Krane, Christian Lotze, Julia Läger, Gaël Reecht, and Katharina J. Franke — Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany

Transition metal dichalcogenides (TMCD) are two-dimensional materials with a natural band gap, making them interesting as sensors, solar cells or LEDs. Single layer molybdenum disulfide is especially interesting, because it provides a direct band gap [1] and a strong spin-splitting of the valence and conduction band.

Here we grow MoS₂ epitaxially on a Au(111) surface as described in [2]. Using a combined STM/AFM at low temperatures, we observe different kinds of defects. Particularly prominent are defects, which appear in sizes of several nanometers. The AFM reveals an atomically intact surface layer, suggesting that the origin of the defect is located at the gold interface. At these sites the bandgap of MoS₂ is significantly modified.

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