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Updated: Apr 5, 2026

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
Published on: April 12, 2018
High-Performance Monolayer WS2 Field-Effect Transistors on High-κ Dielectrics
Yang Cui1, Run Xin1, Zhihao Yu1
1National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China.
High-quality aluminum oxide dielectric and thiol chemistry passivation significantly boost charge transport in monolayer tungsten disulfide (WS2). This breakthrough achieves record mobilities, transitioning conductivity from insulating to metallic regimes.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Interface traps and impurities hinder charge transport in 2D materials.
- Achieving high mobility in monolayer transition metal dichalcogenides (TMDs) is crucial for next-generation electronics.
Purpose of the Study:
- To improve charge transport properties of monolayer tungsten disulfide (WS2).
- To investigate the effects of aluminum oxide dielectric and thiol passivation on WS2.
Main Methods:
- Fabrication of monolayer WS2 devices with high-quality Al2O3 dielectric.
- Application of thiol chemistry for interface passivation.
- Electrical characterization to measure charge carrier mobility.
Main Results:
- Reduced density of interface traps and Coulomb impurities.
- Significantly enhanced charge carrier mobility in monolayer WS2.
- Achieved record mobilities of 83 cm²/Vs at room temperature and 337 cm²/Vs at low temperature.
- Observed a transition from insulating to metallic charge transport regimes.
Conclusions:
- The combination of Al2O3 dielectric and thiol passivation is highly effective for improving WS2 performance.
- Demonstrated a viable strategy for high-performance 2D electronic devices.
- Developed a theoretical model for electron transport in passivated monolayer WS2.
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