Document Type

Article

Publication Date

April 2015

Publication Title

Journal of Applied Physics

Volume

117

Issue Number

13

DOI

10.1063/1.4916536

ISSN

0021-8979

Disciplines

Materials Science and Engineering

Abstract

In this work, surface oxidation of monolayer MoS2 (one of the representative semiconductors in transition-metal dichalcogenides) has been investigated using density functional theory method. Oxygen interaction with MoS2 shows that, thermodynamically, the surface tends to be oxidized. However, the dissociative absorption of molecular oxygen on the MoS2 surface is kinetically limited due to the large energy barrier at low temperature. This finding elucidates the air stability of MoS2 surface in the atmosphere. Furthermore, the presence of defects significantly alters the surface stability and adsorption mechanisms. The electronic properties of the oxidized surface have been examined as a function of oxygen adsorption and coverage as well as substitutional impurities. Our results on energetics and kinetics of oxygen interaction with the MoS2 monolayer are useful for the understanding of surface oxidation, air stability, and electronic properties of transition-metal dichalcogenides at the atomic scale.

Comments

SJSU users: Use the following link to login and access the article via SJSU databases.This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Journal of Applied Physics, volume 117, issue 13, 2015, and may be found at https://doi.org/10.1063/1.4916536© 2015 AIP Publishing LLC

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