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A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

Published on: August 28, 2018

Semiconducting two-dimensional graphene nanoconstriction arrays.

Nathaniel S Safron¹, Adam S Brewer, Michael S Arnold

¹Department of Materials Science and Engineering, University of Wisconsin-Madison, 1509 University Ave., Madison, WI 53706, USA.

Small (Weinheim an Der Bergstrasse, Germany)

|March 2, 2011

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Researchers created novel graphene nanoconstriction arrays for advanced electronics. These semiconductor materials exhibit tunable electronic properties, paving the way for next-generation flexible and transparent devices.

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Graphene's unique electronic properties offer potential for advanced semiconductor devices.
Developing scalable methods for fabricating nanoscale graphene structures is crucial for practical applications.

Purpose of the Study:

To fabricate and characterize two-dimensional (2D) nanoconstriction arrays of graphene.
To investigate the electronic properties of these arrays, focusing on field-effect modulation and quantum confinement effects.

Main Methods:

Utilized self-assembled polystyrene nanospheres for scalable top-down lithography.
Employed electron microscopy, Raman spectroscopy, and charge transport measurements for characterization.

Main Results:

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Fabricated sub-20-nm graphene nanoconstrictions and islands with high conductance modulation (up to 450 at room temperature, ~1000 at low temperatures).
Observed semiconductor behavior with field-effect modulation and charge mobilities of ~1 cm²/V·s.
Demonstrated that effective bandgap scales inversely with nanoconstriction width due to quantum confinement.
Observed single-electron charging events at low temperatures, indicating Coulomb island behavior.

Conclusions:

The developed scalable fabrication method yields graphene nanoconstriction arrays with significant electronic modulation.
These nanopatterned graphene materials show promise for applications in thin-film, flexible, and transparent semiconductor electronics.