Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 66: Poster: Nanostructures at Surfaces
O 66.11: Poster
Wednesday, March 20, 2024, 18:00–20:00, Poster C
Defect formation in 2D materials by irradiation with highly charged ions — •Lucia Skopinski, Yossarian Liebsch, Stephan Sleziona, Leon Daniel, Lars Breuer, and Marika Schleberger — Fakultät für Physik and CENIDE, Universität Duisburg-Essen, Duisburg, Germany
Two-dimensional (2D) materials, in particular transition metal dichalcogenides, are known for their unique properties. Under bombardment with highly charged ions (HCIs), these materials are modified by targeted defects, allowing tuning of desired properties. Our study addresses the fundamental mechanisms governing the interaction between HCIs and 2D-MoS2 on different substrates. Each HCI possesses both kinetic and potential energy due to its velocity and charge state, leading to changes such as sputtering of particles upon impact with the material surface. However, a full understanding of the underlying mechanisms is still under discussion.
An in-depth analysis of the emission of secondary ions and atoms aims to unravel the importance of potential and kinetic energy for the underlying nuanced processes. The measured distributions allow a distinction between sputtering driven by the potential and the kinetic energy of the primary ion. The low velocities of the emitted particles suggest an interaction mechanism related to electron-phonon coupling. Furthermore, a comparative study of STEM measurements for pores in 2D-MoS2 irradiated on a substrate and free-standing provides insight into the influence of the substrate on the modification of the 2D material.
Keywords: highly charged ions; ion surface interaction; 2D-MoS2