All-Graphene Three-Terminal-Junction Field-Effect Devices as Rectifiers and Inverters

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanoelectronics

Background:

• Graphene's unique electronic properties enable novel device applications.
• Previous nanoscale graphene rectifiers operated ballistically with limited efficiency.
• Developing efficient, room-temperature rectifiers is crucial for electronic circuits.

Purpose of the Study:

• To demonstrate tunable and switchable room-temperature rectification using micrometer-scale graphene devices.
• To explore an alternative operational model beyond ballistic transport for graphene rectifiers.
• To advance the development of all-graphene thin-film devices for integrated circuits.

Main Methods:

• Fabrication of micrometer-scale, three-terminal junction field-effect devices using monolayer chemical vapor deposition (CVD) graphene.
• Utilizing graphene for both channel and gate electrodes to create an all-graphene thin-film structure.
• Characterization of rectification performance at 100 kHz AC input and analysis using an electric-field capacitive model.

Main Results:

• Achieved prominent tunable and switchable room-temperature rectification at 100 kHz.
• Explained rectification characteristics via an electric-field capacitive model based on self-gating, deviating from ballistic theory.
• Demonstrated efficient rectification in a diffusive operation regime, contrasting with lower efficiency in nanoscale ballistic devices.

Conclusions:

• Micrometer-scale, all-graphene devices enable efficient room-temperature rectification through diffusive operation.
• The electric-field capacitive model provides a viable explanation for rectification in the high source-drain bias regime.
• This work represents a significant advancement for integrated monolithic graphene circuits.