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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

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Visualizing electrical breakdown and ON/OFF states in electrically switchable suspended graphene break junctions.

Hang Zhang¹, Wenzhong Bao, Zeng Zhao

¹Department of Physics and Astronomy, University of California, Riverside, California 92521, USA.

|March 21, 2012

Summary

Researchers programmed suspended graphene devices by applying voltage pulses, creating switchable all-carbon electronics. This breakthrough suggests atomic movement enables switching, paving the way for novel graphene-based devices.

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Area of Science:

Materials Science
Nanotechnology
Solid State Physics

Background:

Graphene's unique electronic properties make it a promising material for next-generation electronics.
Developing reliable switching mechanisms in graphene devices is crucial for their practical application.

Purpose of the Study:

To investigate the formation of narrow gaps in suspended graphene using pulsed electrical breakdown.
To explore the switching behavior and underlying mechanisms in these graphene devices.

Main Methods:

Fabrication of suspended single- to few-layer graphene devices.
Application of programmed voltage pulses (2.5–4.5 V for ON, ~8 V for OFF) to control device conductance.
Electron microscope imaging to analyze device structure and gap formation.
Temperature-dependent measurements to elucidate the switching mechanism.

Main Results:

Successfully created narrow gaps in suspended graphene via pulsed electrical breakdown.
Demonstrated programmable switching of device conductance with distinct ON and OFF states.
Observed that device conductance approaches zero with increasing gap size.
Found that switching rate is highly temperature-dependent, suggesting non-electromechanical switching.

Conclusions:

The switching behavior in suspended graphene devices is likely driven by atomic movement or chemical rearrangement.
These findings highlight the potential of all-carbon devices for seamless integration with existing graphene electronics.
Pulsed electrical breakdown offers a viable method for fabricating switchable graphene nanostructures.