Tuning electrical performance of dual-gate semiconducting graphene field-effect transistor using plasma parameters

Area of Science:

• Materials Science
• Electrical Engineering
• Semiconductor Physics

Background:

• Graphene field-effect transistors (GFETs) are promising for advanced electronics.
• Optimizing GFET fabrication processes is crucial for performance enhancement.
• Vertically aligned graphene synthesized via PECVD offers unique structural advantages.

Purpose of the Study:

• To investigate the impact of plasma parameters on dual-gate semiconducting GFET performance.
• To correlate electrical properties with specific plasma conditions and graphene thicknesses.
• To provide a theoretical framework for optimizing plasma-grown GFETs.

Main Methods:

• Simulation-based analysis using SILVACO TCAD software.
• Investigated varying electron and ion temperatures and densities in PECVD.
• Correlated simulated electrical properties with experimental observations.

Main Results:

• Electrical properties such as drain current, Ion/Ioff ratio, transconductance, and cutoff frequency increase with decreasing plasma parameters.
• A clear relationship was established between plasma processing parameters and GFET characteristics.
• Simulated results align with existing experimental findings.

Conclusions:

• Decreasing plasma parameters in PECVD fabrication optimizes dual-gate GFET performance.
• The developed relations enable modulation of GFET properties for industrial applications.
• Findings support future experimental validation and process optimization for high-frequency circuits, solar cells, supercapacitors, and biosensors.