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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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Mono- and bilayer WS2 light-emitting transistors.

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We created ambipolar field-effect transistors using tungsten disulfide (WS2) for efficient electron and hole transport. These devices emit light, enabling new studies of WS2 optoelectronics.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Tungsten disulfide (WS2) is a promising semiconducting transition metal dichalcogenide with unique electronic and optical properties.
  • Field-effect transistors (FETs) are crucial for electronic device applications, but achieving ambipolar behavior in WS2 requires advanced gating techniques.

Purpose of the Study:

  • To fabricate and characterize ambipolar ionic liquid gated FETs based on WS2 mono- and bilayers.
  • To investigate the opto-electronic response and light emission properties of these WS2 devices.
  • To quantitatively determine key electronic and excitonic properties.

Main Methods:

  • Fabrication of WS2 mono- and bilayer field-effect transistors.
  • Ionic liquid gating for efficient charge accumulation.
  • Electrical transport measurements to characterize carrier mobility and band gap.
  • Optical spectroscopy to analyze emitted light and estimate excitonic binding energies.

Main Results:

  • High-quality ambipolar transport was achieved in WS2 FETs, enabling both electron and hole accumulation.
  • Quantitative determination of band gaps: 2.14 eV for monolayers and 1.82 eV for bilayers.
  • Observation of light emission from the FET channel due to simultaneous electron and hole injection.
  • Estimation of excitonic binding energies based on optical and electrical measurements.

Conclusions:

  • Ionic liquid gating is a powerful technique for high-performance WS2 nanoelectronic devices compatible with optical measurements.
  • The demonstrated ambipolar behavior and light emission pave the way for broader investigations into WS2 optoelectronics.
  • These findings advance the understanding of excitonic properties in transition metal dichalcogenides across a wide carrier density range.