Controllable n-type doping on CVD-grown single- and double-layer graphene mixture.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Graphene's unique electronic properties make it promising for various applications.
• Controlling graphene's electronic characteristics, such as work function, is crucial for device integration.
• Chemical vapor deposition (CVD) is a key method for producing high-quality graphene.

Purpose of the Study:

• To investigate n-type doping of single- and double-layer graphene grown by CVD.
• To explore the relationship between dopant concentration and graphene's work function.
• To understand the impact of doping on graphene's electronic band structure.

Main Methods:

• Utilized decamethyl-cobaltocene as an n-type dopant for graphene.
• Employed chemical vapor deposition (CVD) for graphene synthesis.
• Analyzed the work function changes in response to varying dopant concentrations.

Main Results:

• A local-quasilinear relationship was observed between graphene's work function and the logarithm of the dopant concentration.
• The study deduced that bandgap opening contributes to this observed relationship.
• Comparisons were made between single-layer and double-layer graphene to understand doping effects.

Conclusions:

• Decamethyl-cobaltocene effectively achieves n-type doping in CVD-grown graphene.
• The findings provide a practical method for tuning graphene's work function.
• This research holds significant implications for the development of graphene-based electronic devices.