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Updated: Sep 16, 2025

Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

Published on: July 11, 2025

CMOS-Compatible Pressure-Assisted Solid-Phase-Diffusion Technique for Large-Area Multilayer Graphene Synthesis.

Kunjesh Agashiwala¹, Ankit Kumar¹, Lin Xu¹

¹Department of Electrical and Computer Engineering, University of California Santa Barbara, Santa Barbara, CA, 93106, USA.

Small (Weinheim an Der Bergstrasse, Germany)

|July 7, 2025

Summary

This summary is machine-generated.

Researchers developed a new method for synthesizing multilayer graphene (MLG) interconnects that is compatible with semiconductor manufacturing. This breakthrough offers superior electrical conductivity and reliability compared to traditional metal interconnects.

Keywords:

CMOS‐compatible intercalation multilayer graphene pressure‐assisted solid‐phase diffusion transfer‐free

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Area of Science:

Materials Science
Semiconductor Physics
Nanotechnology

Background:

Conventional metal interconnects in advanced Complementary Metal-Oxide-Semiconductor (CMOS) technology nodes face challenges like increased resistance and electromigration.
Traditional multilayer graphene (MLG) synthesis requires high temperatures and transfer processes incompatible with CMOS fabrication.

Purpose of the Study:

To develop a CMOS-compatible, transfer-free synthesis method for high-quality MLG interconnects.
To achieve enhanced electrical conductivity and electromigration reliability in MLG interconnects.

Main Methods:

Pioneered a pressure-assisted solid-phase diffusion technique for direct MLG growth within CMOS back-end-of-line (BEOL) thermal budgets (<500 °C).
Utilized optimized intercalation doping to enhance MLG conductivity.
Investigated catalyst selection, carbon sources, and process parameters influencing MLG quality.

Main Results:

Achieved direct synthesis of high-quality MLG compatible with CMOS fabrication.
Demonstrated significantly enhanced electrical conductivity, surpassing sub-30 nm metal wires.
Exhibited excellent electromigration reliability for MLG interconnects.

Conclusions:

The developed transfer-free MLG synthesis and doping technique overcomes limitations of traditional methods.
This scalable technology has the potential to revolutionize interconnects in mainstream semiconductor manufacturing.
Lays the groundwork for graphene applications in optoelectronics, spintronics, and flexible electronics.