Synthesis of graphene on silicon dioxide by a solid carbon source

Area of Science:

• Materials Science
• Nanotechnology
• Solid-State Physics

Background:

• Graphene synthesis is crucial for advanced electronics.
• Current methods often involve complex transfer steps, limiting scalability.
• Developing direct fabrication methods on insulating substrates is highly desirable.

Purpose of the Study:

• To develop a novel, scalable method for graphene fabrication on silicon dioxide.
• To characterize the morphology and electrical properties of the synthesized graphene.
• To demonstrate the feasibility of using CMOS-compatible processes.

Main Methods:

• Fabrication via solid-state dissolution of silicon carbide and nickel thin films.
• Rapid thermal annealing for carbon dissolution and segregation.
• Wet etching of nickel to transfer graphene to silicon dioxide.
• Characterization using Scanning Tunneling Microscopy (STM) and Raman spectroscopy.
• Raman mapping for morphological analysis.
• Fabrication of devices for electrical measurements.

Main Results:

• Successful fabrication of polycrystalline graphene over the entire nickel surface.
• Micrometer-size graphene grains observed via Raman mapping.
• Electrical characterization showed modulation of transfer current by backgate electric fields.
• Demonstrated a transfer-free graphene fabrication process.

Conclusions:

• The presented method enables mass fabrication of polycrystalline graphene on silicon dioxide.
• The process is compatible with Complementary Metal-Oxide-Semiconductor (CMOS) manufacturing.
• This approach offers a scalable route for graphene integration in electronic devices.