SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 30: 2D Materials I: Electronic Structure

O 30.10: Vortrag

Dienstag, 28. März 2023, 12:45–13:00, GER 37

Hot electron driven charge carrier dynamics at the MoS₂/gold interface: a sum frequency generation study — •Tao Yang, Erik Pollmann, Stephan Sleziona, Peter Kratzer, Marika Schleberger, Richard Kramer Campen, and Yujin Tong — Fakultät für Physik, Universität Duisburg-Essen, 47057 Duisburg, Germany

Monolayer transition metal dichalcogenides (TMDCs) have potential applications as optoelectronics and (photo)electrocatalysts due to their fascinating electronic and optical properties. Applying these extraordinary properties to build devices and catalysts, it is often necessary to bring TMDCs into contact with a metallic surface. However, the charge transfer process across the semiconductor-metal interface is still not clear. While the quench of photoluminescence spectra has been reported for monolayer TMDCs on gold, which was understood to be a charge transfer of excited electrons from TMDC monolayer into the metal, it’s interesting to ask what happens when the charge carrier is excited from the metal side. Here we use an azimuthal-dependent sum frequency generation combined with a pump-probe scheme to study the effect of the selectively excited hot electrons by 800 nm pump laser on the behavior of excitons of monolayer MoS₂. Our results show that the hot electrons from the gold substrate can significantly suppress the formation of excitons.