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Article Dans Une Revue npj 2D Materials and Applications Année : 2020

Synthesis of epitaxial monolayer Janus SPtSe

A. Marty
C. Vergnaud

Résumé

Janus single-layer transition metal dichalcogenides, in which the two chalcogen layers have a different chemical nature, push chemical composition control beyond what is usually achievable with van der Waals heterostructures. Here we report such a novel Janus compound, SPtSe, which is predicted to exhibit strong Rashba spin-orbit coupling. We synthetized it by conversion of a single-layer of PtSe$_2$ on Pt(111) via sulphurization under H$_2$S atmosphere. Our in situ and operando structural analysis with grazing incidence synchrotron X-ray diffraction reveals the process by which the Janus alloy forms. The crystalline long-range order of the as-grown PtSe$_2$ monolayer is first lost due to thermal annealing. A subsequent recrystallization in presence of a source of sulphur yields a highly ordered SPtSe alloy, which is iso-structural to the pristine PtSe$_2$. The chemical composition is resolved, layer-by-layer, using angle-resolved X-ray photoelectron spectroscopy, demonstrating that Se-by-S substitution occurs selectively in the topmost chalcogen layer.

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Matériaux
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Dates et versions

hal-03020687 , version 1 (24-11-2020)

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R. Sant, M. Gay, A. Marty, S. Lisi, R. Harrabi, et al.. Synthesis of epitaxial monolayer Janus SPtSe. npj 2D Materials and Applications, 2020, 4, pp.41. ⟨10.1038/s41699-020-00175-z⟩. ⟨hal-03020687⟩
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