CUED Publications database

From Growth Surface to Device Interface: Preserving Metallic Fe under Monolayer Hexagonal Boron Nitride

Caneva, S and Martin, MB and D'Arsié, L and Aria, AI and Sezen, H and Amati, M and Gregoratti, L and Sugime, H and Esconjauregui, CS and Robertson, J and Hofmann, S and Weatherup, RS (2017) From Growth Surface to Device Interface: Preserving Metallic Fe under Monolayer Hexagonal Boron Nitride. ACS applied materials & interfaces, 9. pp. 29973-29981.

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Abstract

We investigate the interfacial chemistry between Fe catalyst foils and monolayer hexagonal boron nitride (h-BN) following chemical vapour deposition and during subsequent atmospheric exposure, using scanning electron microscopy, X-ray photoemission spectroscopy, and scanning photoelectron microscopy. We show that regions of the Fe surface covered by h-BN remain in a reduced state during exposure to moist air for ~40 hours at room temperature. This protection is attributed to the strong interfacial interaction between h-BN and Fe, which prevents the rapid intercalation of oxidizing species. Local Fe oxidation is observed on bare Fe regions and close to defects in the h-BN film (e.g. domain boundaries, wrinkles, and edges), which over the longer-term provide pathways for slow bulk oxidation of the Fe. We further confirm that the interface between h-BN and reduced Fe can be recovered by vacuum annealing at ~600 °C, although this is accompanied by the creation of defects within the h-BN film. We discuss the importance of these findings in the context of integrated manufacturing and transfer-free device integration of h-BN, particularly for technologically important applications where h-BN has potential as a tunnel barrier such as magnetic tunnel junctions.

Item Type: Article
Uncontrolled Keywords: hexagonal boron nitride (h-BN) iron (Fe) interfacial chemistry X-ray photoelectron spectroscopy (XPS) chemical vapor deposition (CVD)
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 07 Aug 2017 20:04
Last Modified: 15 Apr 2021 05:11
DOI: 10.1021/acsami.7b08717