Wafer-Scale Oxygen-Doped MoS₂ Monolayer

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Monolayer molybdenum disulfide (MoS₂) is a key 2D semiconductor for advanced electronics.
• Uniform doping of wafer-scale MoS₂ is crucial for tailoring properties and enabling applications.
• Existing methods struggle with uniform doping of large-scale MoS₂.

Purpose of the Study:

• To achieve uniform oxygen doping in wafer-scale monolayer MoS₂ (MoS_2-xO_x).
• To investigate the effect of oxygen doping on the electronic band structure.
• To demonstrate the performance of doped MoS₂ in electronic devices.

Main Methods:

• In situ chemical vapor deposition for uniform oxygen doping of MoS₂.
• Ultrafast infrared spectroscopy to probe electronic properties.
• First-principles calculations to understand doping mechanisms.
• Fabrication of field-effect transistors and logic devices.

Main Results:

• Achieved uniform oxygen doping in wafer-scale monolayer MoS₂ with tunable levels (MoS_2-xO_x).
• Observed a reduction in bandgap with increasing oxygen doping.
• Demonstrated excellent electronic performance in fabricated transistors and logic devices.

Conclusions:

• Uniform oxygen doping is a viable method for tailoring MoS₂ properties.
• Doped MoS_2-xO_x shows promise for next-generation miniaturized and flexible electronics.
• This work paves the way for large-scale applications of doped 2D semiconductors.