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O: Fachverband Oberflächenphysik
O 47: Poster Session - 2D Materials: Electronic Structure, Excitations, etc.
O 47.13: Poster
Dienstag, 17. März 2020, 18:15–20:00, P2/EG
Modulation of the excitonic behaviour of MoS2 on gold electrodes with external potential: a sum frequency spectroscopy study — •Tao Yang1, Erik Pollmann2, Marika Schleberger2, Yujin Tong1,2, and Richard Kramer Campen1,2 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany — 2University of Duisburg-Essen, Faculty of Physics,Lotharstr. 1, 47057 Duisburg, Germany
Two dimensional (2D) materials have recently attracted significant attention because of their unique electronic and optical properties. In particular MoS2, a transition metal dichalcogenide, has been intensively studied due to its dramatically layer-dependent properties and potential application in electrocatalysis, field-effect transistors and optoelectronics. While the fundamental physics of MoS2 are increasingly well understood, less attention has been devoted to, and virtually all of these applications require, charge transfer between some other material, often a metal electrode and the MoS2. Here we use final state resonant sum frequency spectroscopy to study the optical response of MoS2 deposited on a gold electrode in aqueous solution as a function of applied bias. The data show the evolution of the A and B exciton with electron doping. Together with Raman and electrochemical characterisation, the current study provides important insights into understanding the relationship between electronic structure, atomic configuration and electron transfer at an MoS2 electrochemical interface.