Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 14: 2D Materials Beyond Graphene: Growth, Structure and Substrate Interaction (joint session O/HL)
O 14.8: Vortrag
Montag, 17. März 2025, 16:45–17:00, H11
Characterization of a large-scale single-domain MoS2 monolayer — •Fabian Schöttke1, Luka Pirker2, Martin Vondráček3, Michaela Hanušová2, Václav Valeš3, Jan Honolka3, Otakar Frank2, Matěj Velický2, and Markus Donath1 — 1Physikalisches Institut, Universität Münster, Münster, Germany — 2J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences, Prague, Czech Republic — 3Institute of Physics, Czech Academy of Sciences, Prague, Czech Republic
To fully utilize the outstanding optical and electronic properties of single-layer transition metal dichalcogenide (TMDC) in devices, a perfect single-domain film is needed. From the wealth of available preparation methods, exfoliation seems to provide the highest film quality. This method, however, commonly results in small flakes within the micrometer regime only. Exfoliation onto, or assisted by, a Au(111) surface is able to result in large-scale single-domain samples of several millimeters in diameter. We experimentally confirm the high quality of a MoS2 monolayer on Au(111) by characterizing several sample properties: optical appearance, long-range structural order, work function changes, and the occupied & unoccupied electronic structure. Optical inspection and diffraction patterns easily identify millimeter-sized single domains. The electronic structure of MoS2 is clearly distinguished from Au(111) states, especially measured by inverse photoemission in the L gap of Au(111). In summary, our experimental data of a MoS2 monolayer exfoliated onto Au(111) demonstrate the capability of this procedure to produce large-scale single-domain TMDC samples.
Keywords: MoS2; Transition Metal Dichalcogenide; Electronic Structure; Inverse Photoemission; ARPES