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O: Fachverband Oberflächenphysik
O 77: Poster Session - 2D Materials: Stacking and Heterostructures
O 77.3: Poster
Mittwoch, 18. März 2020, 18:15–20:00, P2/EG
Air tightness of hBN encapsulation and its impact on Raman spectroscopy of sensitive van der Waals materials — •Lorenz Bauriedl1, Johannes Holler1, Tobias Korn2, Andrea Seitz1, Furkan Özyigit1, Michaela Eichinger1, Christian Schüller1, Kenjii Watanabe3, Takashi Taniguchi3, Christoph Strunk1, and Nicola Paradiso1 — 1University of Regensburg — 2University of Rostock — 3National Institute for Materials Science, Tsukuba
In this work, we study the air-tightness of hBN encapsulation of devices based on sensitive 2D materials, as e.g. NbSe2. hBN encapsulation is the most common passivation method for a wide range of 2D material-based devices. We use Raman spectroscopy to monitor the photo-oxidation induced by intense illumination as a function of time for several encapsulation layouts. We demonstrated that full encapsulation in hBN effectively provides a long term protection against oxidation for samples kept in ambient conditions. The same does not hold for half encapsulated devices, i.e. with hBN applied only on the top. In this latter case, we observe a slow but relentless diffusion of oxygen in between the hBN layer and the SiO2 substrate.