Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 48: 2D Materials 1: Electronic Structure of Transition Metal Dichalcogenides

O 48.8: Vortrag

Mittwoch, 7. September 2022, 16:45–17:00, S052

Effect of gold substrate on the excitonic properties of MoS₂: a final state sum frequency spectroscopy study — •Tao Yang, Erik Pollmann, Stephan Sleziona, Marika Schleberger, Richard Kramer Campen, and Yujin Tong — Fakultät für Physik Universität Duisburg-Essen, 47057 Duisburg, Germany

Monolayer transition metal dichalcogenides(TMDCs) are promising candidates for applications in electronics, optoelectronics, and photocatalysts due to their good thermodynamic stability, ease of preparation, tunable bandgap in the visible region, and pronounced activity for photoelectrochemical water splitting. To take advantage of their excellent properties to build the devices and catalysts, a metallic surface is required to combine them. However, compared to the well-explored properties of monolayer TMDCs on dielectric substrates, less attention has been paid to these properties on metal substrates due to the challenges associated with linear spectroscopies probing, such as quenching. Here we use a final state sum frequency spectroscopy(FSSFG) to study the optical properties of MoS₂ exfoliated on a gold surface. Relative to the well-known six-fold symmetry of MoS₂ on SiO₂, the azimuthal dependent FSSFG show significantly different patterns at different polarization combinations. The current study provides important insights into the significant changes in electronic structure when MoS₂ comes into contact with gold, and the possibility to selectively switch resonance on and off through azimuthal tuning, as revealed by the robust FSSFG.