Direct growth of doping-density-controlled hexagonal graphene on SiO2 substrate by rapid-heating plasma CVD

Area of Science:

• Materials Science
• Nanotechnology
• Surface Science

Background:

• Graphene synthesis typically involves complex transfer processes.
• Controlling graphene's carrier density and electrical properties is crucial for device applications.
• Direct growth on insulating substrates like SiO(2) remains challenging.

Purpose of the Study:

• To develop a novel, transfer-free method for direct graphene growth on SiO(2) substrates.
• To achieve carrier-density-controlled graphene with tunable electrical properties.
• To demonstrate the fabrication of graphene-based field-effect transistors (FETs) using this method.

Main Methods:

• Utilizing rapid-heating plasma chemical vapor deposition (RH-PCVD).
• Growing single-layer graphene selectively between a Ni film and SiO(2) substrate.
• Controlling graphene's electrical transport type by adjusting NH(3) gas concentration.

Main Results:

• Successful realization of transfer-free graphene growth directly on SiO(2).
• High-quality single-layer graphene sheets with hexagonal domains were obtained.
• Demonstrated scalable fabrication of graphene-based FETs with tunable electrical properties.

Conclusions:

• RH-PCVD offers a unique and effective approach for direct graphene synthesis.
• The method allows precise control over graphene carrier density and FET performance.
• This technique simplifies graphene device fabrication and enhances its applicability.