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Related Concept Videos

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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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Improved carrier mobility in few-layer MoS2 field-effect transistors with ionic-liquid gating.

Meeghage Madusanka Perera1, Ming-Wei Lin, Hsun-Jen Chuang

  • 1Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, United States.

ACS Nano
|April 18, 2013
PubMed
Summary

Ionic liquid-gated field-effect transistors (FETs) using molybdenum disulfide (MoS2) show enhanced electron mobility. This ionic liquid (IL) gate design improves carrier mobility and device performance compared to traditional back-gated devices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Field-effect transistors (FETs) are crucial electronic components.
  • Molybdenum disulfide (MoS2) is a promising 2D material for next-generation electronics.
  • Improving carrier mobility and device performance in MoS2 FETs is an active research area.

Purpose of the Study:

  • To fabricate and characterize ionic liquid (IL)-gated field-effect transistors (FETs) using bilayer and few-layer MoS2.
  • To investigate the impact of IL gating on the electrical transport properties of MoS2 FETs.
  • To compare the performance of IL-gated MoS2 FETs with conventional back-gated devices.

Main Methods:

  • Fabrication of MoS2-based field-effect transistors.
  • Gating the devices using an ionic liquid (IL) dielectric layer.
  • Electrical transport measurements, including four-terminal measurements, to determine carrier mobility.
  • Analysis of device characteristics such as ON/OFF ratio and subthreshold swing.

Main Results:

  • Ionic liquid-gated MoS2 FETs exhibited significantly enhanced electron mobility (μ ≈ 60 cm(2) V(-1) s(-1) at 250 K) compared to back-gated devices.
  • Mobility increased from ≈ 100 cm(2) V(-1) s(-1) at 180 K to ≈ 220 cm(2) V(-1) s(-1) at 77 K, consistent with four-terminal measurements.
  • Devices showed ambipolar behavior with high ON/OFF ratios (>10(7) for electrons, >10(4) for holes) and a near-ideal subthreshold swing (≈ 50 mV/dec at 250 K).

Conclusions:

  • The use of ionic liquid gating effectively enhances carrier mobility in MoS2 FETs.
  • The performance improvement is attributed to the reduction of Schottky barriers at the source/drain electrodes due to band bending induced by the IL dielectric.
  • IL-gated MoS2 FETs represent a promising advancement for high-performance electronic applications.