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Atomic Structure and Dynamics of Defects in 2D MoS2 Bilayers.

Si Zhou1, Shanshan Wang1, Huashan Li2

  • 1Department of Materials, University of Oxford, 16 Parks Road, Oxford OX1 3PH, U.K.

ACS Omega
|August 29, 2019
PubMed
Summary

Defects in bilayer molybdenum disulfide (MoS2) were studied at the atomic level. Sulfur vacancies migrate between layers and form larger structures, impacting stacking differently than in monolayer MoS2.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Bilayer molybdenum disulfide (MoS2) is a promising two-dimensional material with unique electronic and optical properties.
  • Understanding defects, such as sulfur vacancies, is crucial for optimizing MoS2-based devices.
  • Previous studies primarily focused on monolayer MoS2, leaving bilayer systems less explored.

Purpose of the Study:

  • To investigate the atomic structure and behavior of sulfur vacancies in bilayer MoS2.
  • To compare defect formation and migration in bilayer MoS2 with its monolayer counterpart.
  • To elucidate the impact of defects on the structural integrity and interlayer interactions in bilayer MoS2.

Main Methods:

  • Aberration-corrected transmission electron microscopy (TEM) at 80 kV accelerating voltage.
  • Atomic-resolution imaging to identify and characterize sulfur vacancies.
  • Analysis of defect distribution, migration pathways, and structural deformations.

Main Results:

  • Sulfur vacancies were observed in both top and bottom layers of 2H- and 3R-stacked MoS2 bilayers.
  • In 3R-stacked bilayers, vacancies preferentially occupied the (Mo-2S) column and exhibited inter-layer migration.
  • Defect aggregation occurred with increasing vacancy concentration, influencing interlayer stacking and causing less strain than in monolayer MoS2.

Conclusions:

  • Defect behavior in bilayer MoS2 is more complex than in monolayer systems, involving inter-layer migration and preferential site occupation.
  • The interplay between layer compression and van der Waals forces influences structural deformations in defective bilayer MoS2.
  • Atomic-level defect studies in multilayered 2D materials reveal distinct characteristics compared to their monolayer forms.