Mapping domain junctions using 4D-STEM: toward controlled properties of epitaxially grown transition metal dichalcogenide monolayers - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue 2D Materials Année : 2023

Mapping domain junctions using 4D-STEM: toward controlled properties of epitaxially grown transition metal dichalcogenide monolayers

Sergej Pasko
Simonas Krotkus
Michael Heuken
Martien den Hertog
Matthieu Jamet
Alain Marty

Résumé

Abstract Epitaxial growth has become a promising route to achieve highly crystalline continuous two-dimensional layers. However, high-quality layer production with expected electrical properties is still challenging due to the defects induced by the coalescence between imperfectly aligned domains. In order to control their intrinsic properties at the device scale, the synthesized materials should be described as a patchwork of coalesced domains. Here, we report multi-scale and multi-structural analysis on highly oriented epitaxial WS 2 and WSe 2 monolayers using scanning transmission electron microscopy (STEM) techniques. Characteristic domain junctions are first identified and classified based on the detailed atomic structure analysis using aberration corrected STEM imaging. Mapping orientation, polar direction and phase at the micrometer scale using four-dimensional STEM enabled to access the density and the distribution of the specific domain junctions. Our results validate a readily applicable process for the study of highly oriented epitaxial transition metal dichalcogenides, providing an overview of synthesized materials from large scale down to atomic scale with multiple structural information.
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Dates et versions

hal-04291553 , version 1 (17-11-2023)

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Djordje Dosenovic, Samuel Dechamps, Celine Vergnaud, Sergej Pasko, Simonas Krotkus, et al.. Mapping domain junctions using 4D-STEM: toward controlled properties of epitaxially grown transition metal dichalcogenide monolayers. 2D Materials, 2023, 10 (4), pp.045024. ⟨10.1088/2053-1583/acf3f9⟩. ⟨hal-04291553⟩
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