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O: Fachverband Oberflächenphysik
O 66: 2D Materials IV: Interfacial Interactions (joint session O/CPP/HL)
O 66.13: Vortrag
Mittwoch, 18. März 2020, 13:30–13:45, WIL B321
Substrate-dependent charge transfer mechanisms between monolayer MoS2 and molecular dopants — •Patrick Amsalem1, Soohyung Park1,2, Thorsten Schultz1,3, Xiaomin Xu1, Berthold Wegner1,3, Areej Aljarb4, Ali Han4, Lain-Jong Li4,5, Vincent C . Tung4,6, and Norbert Koch1,3 — 1Humboldt-Universität zu Berlin, Institut für Physik & IRIS Adlershof, Berlin, Germany — 2Korea Institute of Science and Technology (KIST), Seoul, South Korea — 3Helmholtz-Zentrum für Materialien und Energie GmbH, Berlin, Germany — 4King Abdullah University of Science and Technology, Thuwal, Saudi Arabia — 5The University of New South Wales, Sydney, Australia — 6Lawrence Berkeley National Lab, Berkeley, CA, USA
2D transition metal dichalcogenides monolayer films have recently gained enormous attention. Yet, to extend the range of applications of these emerging materials, tuning their Fermi level is of crucial importance. Here, we report on the adsorption of a strong p-type organic dopant, F6TCNNQ, as an efficient route for doping of MoS2 [1]. More specifically, we employ angle-resolved UV and X-ray photoelectron spectroscopy to reveal the charge transfer (CT) mechanisms taking place at a TMDC/organic interface as a function of the electrical properties of the employed supporting substrate, here sapphire, graphite and gold. The present findings can be exploited for the design of advanced hybrid heterostructures with tailored electronic properties. [1] S. Park et al., Communications Physics 2, 109 (2019).