The Effect of Substrate on Vibrational Properties of Single-Layer MoS2
K. Gołasaa, M.R. Molas b, K. Nogajewski b, M. Grzeszczyk a, M. Zinkiewicz a, M. Potemski b and A. Babiński a
aFaculty of Physics, University of Warsaw, L. Pasteura 5, 02-093 Warsaw, Poland
bLaboratoire National des Champs Magnétiques Intenses, CNRS-UGA-UPS-INSA-EMFL, 25 rue des Martyrs, 38042 Grenoble, France
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We report on the Raman scattering from single-layer molybdenum disulfide (MoS2) deposited on various substrates: Si/SiO2, hexagonal boron nitride (h-BN), sapphire, as well as suspended. Room temperature Raman scattering spectra are investigated under both resonant (632.8 nm) and non-resonant (514.5 nm) excitations. A rather weak influence of the substrate on the Raman scattering signal is observed. The most pronounced, although still small, is the effect of h-BN, which manifests itself in the change of energy positions of the E' and A'1 Raman modes of single-layer MoS2. We interpret this modification as originating from van der Waals interaction between the MoS2 and h-BN layers.

DOI: 10.12693/APhysPolA.130.1172
PACS numbers: 63.22.-m, 71.35.-y, 78.20.-e, 78.30.-j