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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Published inNPJ 2D materials and applications Vol. 4; no. 1
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 Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 20.11.2020
Nature Publishing Group
Nature
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