Oxygen defects in phosphorene

Abstract

Oxygen, invariably present in a normal working environment, is a fundamental cause of the degradation of phosphorene. Using first-principles calculations, we show that for each oxygen atom adsorbed onto phosphorene there is an energy release of about 2 eV. Although the most stable forms of oxygen are electrically inactive and lead only to minor distortions of the lattice, there are a number of low energy metastable forms which introduce deep donor and/or acceptor levels in the gap. We also propose a possible mechanism for phosphorene oxidation and we suggest that dangling oxygen atoms increase the hydrophilicity of phosphorene due to their ability to establish hydrogen bonds.

5 pages, 5 figures

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