Identifying and Visualizing the Edge Terminations of Single-Layer MoSe<sub>2</sub> Island Epitaxially Grown on Au(111).
basic_science · Level V
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- Record sourced from PubMed, PMID 28190333.
- Also identified by DOI 10.1021/acsnano.6b07512.
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Abstract
Recently, single-layer transition-metal dichalcogenides have drawn significant attention due to their remarkable physical properties in the monolayer as well as at the edges. Here, we constructed high-quality, single-layer MoSe<sub>2</sub> islands on the Au(111) surfaces in ultrahigh vacuum by molecular beam epitaxy. All of the islands have hexagonal or triangular shapes with two kinds of well-defined edges. Scanning tunneling spectroscopy (STS) curves show notable differences in positive sample bias for the two types of edges. Density functional theory calculations for several edge configurations of MoSe<sub>2</sub> confirm that the STS differences are attributed to the coupling between the p<sub>z</sub> orbital of Se atoms and the d<sub>xz</sub> orbital of Mo atoms, and the two types of observed edge terminations are the bare Se edge and selenium-saturated Mo edge.