Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 14: 2D Materials and their Heterostructures II (joint session DS/HL)
HL 14.7: Vortrag
Dienstag, 18. März 2025, 11:30–11:45, H3
Unveiling the mechanism of monolayer selective large-area exfoliation of 2D materials — •Jakob Ziewer1, Abyay Ghosh1, Michaela Hanušová2, Luka Pirker2, Otakar Frank2, Matěj Velický2, Myrta Grüning1, and Fumin Huang1 — 1Queen’s University Belfast, Belfast, U.K. — 2J. Heyrovský Institute of Physical Chemistry
Metal assisted exfoliation has made it possible to selectively isolate single crystal monolayers of 2D materials at sizes up to a centimetre [1][2]. This represents a million fold increase compared to standard tape exfoliation.
In this presentation the mechanism of enhanced yield is discussed. Through spectroscopic measurements and observation of macroscopic bubbles it is discovered that the Au substrate decouples attached MoS2 monolayers from the remaining crystal. The interfacial weakening is dependant on the thickness of the crystal and is maximised for thick crystals.
These findings are used to explain the mechanism behind metal assisted exfoliation and are expected to extend to other Au-2D heterostructures.
[1] Velický, M.; et. al. Mechanism of Gold-Assisted Exfoliation of Centimeter-Sized Transition-Metal Dichalcogenide Monolayers. ACS Nano 2018, 12, 10463*10472. [2] Huang, Y.; et. al. Universal Mechanical Exfoliation of Large-Area 2D Crystals. Nat. Commun. 2020, 11:2453.
Keywords: 2D; Au; Exfoliation; Monolayer-selective; TMD