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Related Experiment Video

Updated: Jan 18, 2026

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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Subnanometric Control of Coupling between WS2 Monolayers with a Molecular Spacer.

Sara A Elrafei1, Tom T C Sistermans2,3, Alberto G Curto1,2,3

  • 1Department of Applied Physics and Eindhoven Hendrik Casimir Institute, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands.

ACS Applied Materials & Interfaces
|September 11, 2025
PubMed
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Researchers used organic molecular spacers to tune interlayer coupling in tungsten disulfide (WS₂) monolayer stacks. Varying spacer thickness altered optical properties and valence-band splitting, showing potential for advanced atomically thin devices.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Monolayer semiconductor heterostructures offer tunable optical and electronic properties for advanced devices.
  • Controlling interlayer interactions is key to harnessing unique monolayer characteristics in stacked materials.
  • Existing spacer materials often present challenges with interface quality and thickness uniformity.

Purpose of the Study:

  • To investigate the use of organic molecular spacers for precise control over interlayer coupling in WS₂ monolayer stacks.
  • To explore how subnanometric control of spacer thickness influences the optical properties of organic-inorganic heterostructures.
  • To demonstrate the tunability of valence-band splitting and exciton energies via molecular spacer engineering.

Main Methods:

Keywords:
heterostructuresinterlayer interactionmolecular spacersmonolayer semiconductorsorganic−inorganic interfaces

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Last Updated: Jan 18, 2026

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  • Fabrication of WS₂ monolayer heterostructures with spin-cast organic molecular spacers of varying thicknesses.
  • Optical characterization to analyze changes in heterostructure properties as a function of spacer thickness.
  • Investigation of valence-band splitting and exciton energy shifts attributed to interlayer interactions and spin-orbit coupling.

Main Results:

  • Successfully tuned interlayer coupling and optical properties by varying molecular spacer thickness.
  • Observed significant alterations in optical properties of the organic-inorganic heterostructures.
  • Demonstrated a clear dependence of valence-band splitting on molecular spacer thickness, affecting A and B exciton energies.

Conclusions:

  • Organic molecular spacers provide an effective and accessible method for tailoring the properties of monolayer heterostructures.
  • This approach enables precise control over interlayer distances and coupling, crucial for advanced atomically thin devices.
  • The findings open new avenues for developing novel sensing technologies at the subnanometer scale.