Solution-Phase Synthesis of Vanadium Intercalated 1T'-WS₂ with Tunable Electronic Properties

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Controlling carrier transport in transition metal dichalcogenides (TMDs) is crucial for advanced electronics.
• Metal ion intercalation is a key strategy for tuning TMD properties.

Purpose of the Study:

• To develop a low-temperature, solution-phase method for intercalating vanadium into WS₂.
• To investigate the impact of vanadium intercalation on the structural and electronic properties of WS₂.

Main Methods:

• Solution-phase synthesis of vanadium-intercalated WS₂.
• Kelvin-probe force microscopy (KPFM) for Fermi level measurements.
• Characterization of structural changes and carrier transport properties.

Main Results:

• Vanadium intercalation expanded WS₂ interlayer spacing to 14.2 Å and stabilized the 1T' phase.
• Fermi level increased by 80 meV due to V 3d orbital hybridization.
• Carrier type switched from p-type to n-type with an order of magnitude increase in mobility.

Conclusions:

• Vanadium intercalation offers a viable route to engineer the electronic properties of WS₂.
• Tunable conductivity and carrier transport barriers were achieved by controlling vanadium concentration.
• This approach provides a pathway for developing novel n-type 2D materials.