Atomic defect states in monolayers of MoS$_2$ and WS$_2$

Saboura Salehi; Alireza Saffarzadeh

doi:10.1016/j.susc.2016.05.003

paper

Atomic defect states in monolayers of MoS $_{2}$ and WS $_{2}$

arXiv:1605.08756 · doi:10.1016/j.susc.2016.05.003

Abstract

The influence of atomic vacancy defects at different concentrations on electronic properties of MoS $_{2}$ and WS $_{2}$ monolayers is studied by means of Slater-Koster tight-binding model with non-orthogonal $s p^{3} d^{5}$ orbitals and including the spin-orbit coupling. The presence of vacancy defects induces localized states in the bandgap of pristine MoS $_{2}$ and WS $_{2}$ , which have potential to modify the electronic structure of the systems, depending on the type and concentration of the defects. It is shown that although the contribution of metal (Mo or W) $d$ orbitals is dominant in the formation of midgap states, the sulphur $p$ and $d$ orbitals have also considerable contribution in the localized states, when metal defects are introduced. Our results suggest that Mo and W defects can turn the monolayers into p-type semiconductors, while the sulphur defects make the system a n-type semiconductor, in agreement with ab initio results and experimental observations.

16 pages, 7 figures

Atomic defect states in monolayers of MoS $_{2}$ and WS $_{2}$

Abstract

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Cited by in corpus (7)

Atomic defect states in monolayers of MoS2​ and WS2​

Abstract

References in corpus (15)

Cited by in corpus (7)

Atomic defect states in monolayers of MoS $_{2}$ and WS $_{2}$