Electronic work function modulation of phosphorene by thermal oxidation
Open Access
- 12 October 2021
- journal article
- research article
- Published by IOP Publishing in 2D Materials
- Vol. 9 (1), 015003
- https://doi.org/10.1088/2053-1583/ac2f21
Abstract
In this study, we evaluate the variation of the work function of phosphorene during thermal oxidation at different temperatures. The ultraviolet photoelectron spectroscopy results show an N-shaped behavior that is explained by the oxidation process and the dangling-to-interstitial conversion at elevated temperatures. The exfoliation degree and X-ray photoelectron spectroscopy confirm the formation of native oxides in the top-most layer that passivates the material. Ex-situ XPS reveals the full oxidation of monolayers at temperatures higher than 140 °C, but few-layer phosphorene withstands the thermal oxidation even up to 200 °C with slight modifications of the A2g/A1g and A2g/B2g vibrational mode ratios and a weak fluorescence in the Raman spectra of the heat-treated samples.Keywords
Funding Information
- Hungarian National Research, Development, and Innovation (Project K120115)
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