Synthesis of epitaxial monolayer Janus SPtSe

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 Janus compound, SPtSe, which is predicted to exhibi...

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Bibliographic Details
Published in:NPJ 2D materials and applications 2020-11, Vol.4 (1), Article 41
Main Authors: Sant, Roberto, Gay, Maxime, Marty, Alain, Lisi, Simone, Harrabi, Rania, Vergnaud, Céline, Dau, Minh Tuan, Weng, Xiaorong, Coraux, Johann, Gauthier, Nicolas, Renault, Olivier, Renaud, Gilles, Jamet, Matthieu
Format: Article
Language:English
Subjects:
639/301/119/544
639/301/357/1018
639/301/357/537
Chemical composition
Chemical Sciences
Chemistry and Materials Science
Coupling (molecular)
Heterostructures
Hydrogen sulfide
Intermetallic compounds
Long range order
Material chemistry
Materials Science
Monolayers
Nanotechnology
Photoelectrons
Recrystallization
Spin-orbit interactions
Structural analysis
Sulfurization
Surfaces and Interfaces
Synchrotron radiation
Synchrotrons
Thin Films
Transition metal compounds
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Summary: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 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 sulfurization 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 sulfur yields a highly ordered SPtSe alloy, which is isostructural 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.
ISSN:2397-7132
2397-7132
DOI:10.1038/s41699-020-00175-z