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Understanding and Controlling Vanadium Doping and Sulfur Vacancy Behavior in Two-Dimensional Semiconductors: Toward

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Doping tungsten disulfide (WS2) monolayers with vanadium (V) enhances optical properties at low concentrations. At higher concentrations, vanadium-sulfur vacancy complexes form, creating tunable midgap states, crucial for optoelectronics.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Transition-metal dichalcogenide (TMD) monolayers are crucial for optoelectronics, catalysis, and quantum technologies.
  • Doping TMDs allows precise tuning of their properties, but dopant-defect interactions complicate outcomes.
  • Sulfur vacancies are common intrinsic defects in TMDs that interact with dopants.

Purpose of the Study:

  • To investigate the effect of varying p-type vanadium (V) doping concentrations in tungsten disulfide (WS2) monolayers.
  • To understand the interplay between V dopants and sulfur vacancies in WS2.
  • To elucidate the mechanisms governing doping behavior and property modulation in WS2.

Main Methods:

  • Systematic variation of vanadium doping density in WS2 monolayers.
  • Photoluminescence (PL) microscopy (excitation- and temperature-dependent).
  • Atomic-resolution scanning transmission electron microscopy (STEM).
  • First-principles calculations.

Main Results:

  • Low V concentrations enhanced WS2 optical properties (increased photoluminescence) without new electronic states.
  • High V concentrations promoted vanadium-sulfur vacancy complexes, generating tunable midgap states.
  • Attractive interactions between p-type V dopants and n-type monosulfur vacancies were identified.

Conclusions:

  • Dopant-defect interactions, specifically V and sulfur vacancies, significantly influence WS2 properties.
  • The balance between enthalpic and entropic effects governs doping outcomes in TMDs.
  • This work provides a pathway for rational design of doping strategies for advanced TMD applications.