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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 Flege¹ — ¹Applied 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.