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Related Experiment Video

Updated: Jul 11, 2026

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

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

Published on: July 24, 2015

Substrate-induced bandgap opening in epitaxial graphene.

S Y Zhou¹, G-H Gweon, A V Fedorov

¹Department of Physics, University of California, Berkeley, California 94720, USA.

Nature Materials

|September 11, 2007

Summary

Graphene grown on silicon carbide (SiC) substrates naturally forms an energy gap, crucial for electronic applications like transistors. This bandgap engineering approach offers a simpler alternative to complex graphene modifications.

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Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon

Published on: July 17, 2020

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Graphene is a promising material for advanced electronics due to its unique properties.
A major limitation for graphene in electronics is its lack of a natural energy bandgap.
Existing methods to create a bandgap in graphene are often complex and difficult to implement.

Purpose of the Study:

To investigate a method for opening an energy gap in graphene.
To explore the potential of substrate interaction for graphene bandgap engineering.
To assess the feasibility of using epitaxial growth for creating functional graphene electronics.

Main Methods:

Epitaxial growth of graphene on silicon carbide (SiC) substrates.
Characterization of the electronic properties of the grown graphene layers.
Analysis of the relationship between sample thickness and the observed energy gap.

Main Results:

Graphene epitaxially grown on SiC substrates exhibits an energy gap of approximately 0.26 eV.
The energy gap size decreases with increasing graphene layer thickness.
The bandgap diminishes to near zero for samples with more than four layers.
The observed gap is attributed to the breaking of sublattice symmetry caused by graphene-substrate interaction.

Conclusions:

Epitaxial growth of graphene on SiC is an effective method for creating a tunable energy bandgap.
This substrate-induced bandgap engineering offers a promising route for developing graphene-based electronic devices, such as transistors.
The findings suggest a simpler pathway for harnessing graphene's electronic potential without complex fabrication techniques.