Site-Selective Synthesis of Bilayer Graphene on Cu Substrates Using Titanium as a Carbon Diffusion Barrier

Area of Science:

• Materials Science
• Nanotechnology
• Electronics Engineering

Background:

• Chemical vapor deposition (CVD) faces challenges in producing large-area uniform bilayer graphene (BLG).
• Existing methods struggle to meet the demands for large-scale integrated circuit applications requiring uniform BLG.
• Conventional reliance on uniform BLG over extensive areas limits scalability.

Purpose of the Study:

• To introduce a novel approach for direct growth of bilayer graphene arrays (BLGA).
• To address the need for scalable and uniform BLG synthesis for integrated circuits.
• To demonstrate a method for controlled BLG growth using patterned diffusion barriers.

Main Methods:

• Direct growth of BLGA on Cu foil substrates using patterned titanium (Ti) as a diffusion barrier.
• Utilizing the Ti layer to control carbon atom diffusion through the Cu foil without compromising graphene quality.
• Fabrication of a 10 × 10 BLG memristor array using the developed BLGA.

Main Results:

• Achieved 100% yield for a 10 × 10 BLGA.
• Fabricated a 10 × 10 BLG memristor array with a 96% yield.
• Demonstrated uniform device performance with set voltages around 4 V and a high resistance state (HRS) to low resistance state (LRS) ratio of approximately 10^7.

Conclusions:

• The patterned Ti diffusion barrier method enables controlled and uniform BLG growth.
• The developed BLGA is suitable for fabricating high-performance, uniform memristor arrays.
• This approach opens new possibilities for BLG-based electronics and integrated circuit applications.