SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 74: 2D Materials IV: Heterostructures (joint session O/CPP)

O 74.1: Talk

Thursday, March 30, 2023, 10:30–10:45, GER 37

In-situ growth characterization of 2D heterostructures: MoSe2 on intercalated graphene/Ru(0001) — •Lars Buß1, Nicolas Braud2, Moritz Ewert1, Matteo Jugovac3, Tevfik Onur Mentes3, Andrea Locatelli3, Jens Falta2, and Jan Ingo Flege11Applied Physics and Semiconductor Spectroscopy, BTU Cottbus-Senftenberg, Cottbus, Germany — 2Institute for Solid State Physics, University of Bremen, Bremen, Germany — 3Elettra-Sincrotrone Trieste S.C.p.A, Bazovizza, Trieste, Italy

Despite the great fundamental interest in 2D heterostructures, most of the investigated 2D heterostructures were realized by mechanical exfoliation or chemical vapor deposition in the millibar range, preventing true in-situ characterization of the growth process. Here, we have investigated the growth of MoSe2 on single-layer graphene on Ru(0001) via real-time in-situ low-energy electron microscopy and micro-diffraction. After preparation of the graphene by standard procedures from an ethylene precursor, MoSe2 has been prepared via co-deposition of Mo and Se. Prior Se intercalation of the graphene appears to enhance the subsequent growth of MoSe2 on the graphene. At elevated temperatures, rotational ordering of the MoSe2 is facilitated by the strongly enhanced mobility of single-domain MoSe2 islands that align with the high symmetry orientations of the underlying graphene, indicating a non-negligible interaction between the two van-der-Waals materials. Micro-spot angle-resolved photoemission proves the monolayer nature of the as-grown MoSe2 as well as the free-standing character of the Se-intercalated graphene underneath.

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