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Atomic Electrostatic Maps of Point Defects in MoS2.

Sebastian Calderon V1, Rafael V Ferreira1,2, Deepyanti Taneja3

  • 1INL, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal.

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|November 30, 2021
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Summary

Defects like sulfur vacancies in molybdenum disulfide (MoS2) monolayers significantly alter atomic electric fields, reducing field strength and inverting charge distribution. These findings are crucial for understanding MoS2 material properties.

Keywords:
atomic resolution imagingdifferential phase contrastmonolayer molybdenum disulfidepoint defects

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Surface Science

Background:

  • Molybdenum disulfide (MoS2) is a key 2D material with unique electronic properties.
  • Understanding atomic-scale defects is crucial for tailoring MoS2 performance.
  • Sulfur vacancies are common defects affecting MoS2's electrical characteristics.

Purpose of the Study:

  • To map the atomic electrostatic fields in MoS2 monolayers.
  • To investigate the impact of sulfur monovacancies and divacancies on these fields.
  • To analyze the resulting charge distribution changes.

Main Methods:

  • Utilizing scanning transmission electron microscopy (STEM) with differential phase contrast imaging.
  • Employing computer simulations for detailed analysis.
  • Quantifying electric field strength and charge distribution around defects.

Main Results:

  • Observed significant redistribution of electric fields near sulfur vacancies.
  • Found a progressive decrease in electric field strength with increasing sulfur atom removal.
  • Electric field strength reduced by ~50% at monovacancies and ~15% at divacancies.
  • Identified an inversion in the polarity of total charge distribution at defect sites.

Conclusions:

  • Sulfur vacancies in MoS2 monolayers drastically modify local atomic electrostatic fields.
  • These defects exhibit a tendency to attract positively charged species.
  • The findings provide insights into defect engineering for MoS2-based devices.