Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 40: Organic Molecules at Surfaces 4: Chemistry on Surfaces
O 40.9: Vortrag
Mittwoch, 7. September 2022, 12:30–12:45, S051
Interface-driven Assembly of Pentacene/MoS2 Lateral Heterostructures: A Combined STM and DFT Study — •Sergio Tosoni1, Francesco Tumino2, Andi Rabia2, Andrea Li Bassi2, and Carlo Casari2 — 1Dipartimento di Scienza dei materiali, Università di Milano-Bicocca, via Roberto Cozzi 55, I-20125 Milano, Italy — 2Dipartimento di Energia, Politecnico di Milano, via G. Ponzio 34/3, Milano, I-20133, Italy
Mixed-dimensional van der Waals heterostructures formed by molecular assemblies and 2D materials provide a novel platform for fundamental nanoscience and future nanoelectronics applications. Here we investigate a hybrid heterostructure between pentacene molecules and 2D MoS2 nanocrystals deposited on Au(111) by means of Scanning Tunneling Microscopy and Density Functional Theory calculations.
In the MoS2/Au interface, the lattice mismatch leads to the growth of extended monolayer films displaying a non-commensurate lattice with the metal substrate and typical features of point defects, identified as single sulfur vacancies.
The formation of atomically thin pentacene/MoS2 lateral heterostructures is observed on the Au substrate. Interestingly, the inner regions of the MoS2 layer are not covered by pentacene. The density of states changes sharply across the pentacene/MoS2 interface indicating a weak interfacial coupling, which leaves unaltered the electronic signature of MoS2 edge states. This work unveils the growth of abrupt lateral heterostructures toward hybrid devices based on organic/inorganic one-dimensional junctions.