CUED Publications database

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

Caneva, S and Martin, M-B and D'Arsié, L and Aria, AI and Sezen, H and Amati, M and Gregoratti, L and Sugime, H and Esconjauregui, S 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 Appl Mater Interfaces, 9. pp. 29973-29981.

Full text not available from this repository.

Abstract

We investigate the interfacial chemistry between Fe catalyst foils and monolayer hexagonal boron nitride (h-BN) following chemical vapor 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 metallic state during exposure to moist air for ∼40 h 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 Fe. We further confirm that the interface between h-BN and metallic 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: X-ray photoelectron spectroscopy (XPS) chemical vapor deposition (CVD) hexagonal boron nitride (h-BN) interfacial chemistry iron (Fe)
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 07 Aug 2017 20:04
Last Modified: 19 Sep 2017 01:33
DOI: