Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 27: Plasmonics and nanooptics: Light-matter interaction, spectroscopy – Poster

O 27.3: Poster

Montag, 9. März 2026, 18:00–20:00, P2

Plasma-assisted defect modification in hBN studied with cathodoluminescence spectroscopy — •Bharti Garg, Masoud Taleb, and Nahid Talebi — Institute of Experimental and Applied Physics, Kiel University, Germany

In this work, we study exfoliated hexagonal boron nitride (hBN) flakes treated with argon plasma for different durations and compare their optical response using cathodoluminescence (CL) spectroscopy. Emission spectra collected before and after plasma exposure allow us to isolate the effects of the treatment. hBN is known for defect-dependent optical emission, and plasma processing is a commonly used method to introduce or modify the density and the atomic structure of defects. We observe that longer plasma exposure leads to stronger defect-related emission and broader CL features, indicating an increase in defect density. The emission though occurs at the same wavelength before and after the plasma treatment, allowing us to conclude that the atomic structure of the defects remains similar even after the plasma interaction with the surface of hBN. These results clarify the influence of plasma treatment on defect formation in hBN and highlight the role of exposure time in tuning its optical properties.

Keywords: hexagonal boron nitride (hBN); cathodoluminescence; defect emission; plasma treatment