Berlin 2024 – scientific programme
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DS: Fachverband Dünne Schichten
DS 20: Poster II
DS 20.33: Poster
Thursday, March 21, 2024, 18:00–20:30, Poster D
Mapping the lateral homogeneity of semiconducting monolayer 2D polar Ag using spectroscopic imaging ellipsometry — •Ulrich Limberg1, Jakob Henz1, Siavash Rajabpour2, Alexander Vera2, Joshua Robinson2, and Ursula Wurstbauer1 — 1Institute of Physics, University of Muenster, Germany — 2MatSE; Center for 2DLM; Atomic; 2D Crystal Consort, PennState University, USA
2D polar metals are a novel family of atomically thin plasmonic quantum materials, which are synthesized by confinement heteroepitaxial growth (CHet)1. Hereby, metal atoms such as silver or gallium are intercalated between bilayer graphene and a silicon carbide substrate. In the case of 2D polar silver, a stable monolayer structure forms which has been shown to be an indirect bandgap semiconductor2. However, Raman imaging seems to indicate the existence of a second, possibly metallic, phase3.
We investigated 2D polar silver samples of varying growth conditions via spectroscopic imaging ellipsometry, in order to access lateral inhomogeneities by modifications in the dielectric functions sensitive to different phases.
1 N. Briggs, et al. Nature materials 19.6 (2020): 637-643.
2 W. Lee, et al., Nano letters, 22(19) (2022): 7841-7847.
3 M. Wetherington et al., 2D Materials, 8.4 (2021): 041003.