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Related Experiment Video

Updated: Jun 7, 2026

Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films

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Published on: December 4, 2014

Subsurface Interface Structure Controlling Local Electronic Properties of Epitaxial Graphene on SiC(0001).

Umamahesh Thupakula¹, Shen Chen¹, Yong Han¹

¹Ames National Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States.

The Journal of Physical Chemistry Letters

|October 2, 2025

Summary

Researchers discovered silicon vacancies at the epitaxial graphene-silicon carbide interface. These vacancies, stable under electric fields, create localized states that enhance charge transfer, crucial for post-silicon electronics.

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Last Updated: Jun 7, 2026

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

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Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics

Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics

Published on: September 28, 2016

Area of Science:

Materials Science
Condensed Matter Physics
Surface Science

Background:

High-mobility semiconducting epitaxial graphene on silicon carbide (SiC) is key for post-silicon electronics.
The atomic structure and bonding of the graphene buffer layer (C_buffer) at the SiC interface remain unclear.
Previous work revealed electric field-dependent switching of C_buffer-SiC bonds.

Purpose of the Study:

To investigate the atomic-scale structure of the C_buffer-SiC interface.
To identify and characterize defects at the interface.
To understand the electronic impact of these defects on charge transfer.

Main Methods:

Scanning tunneling microscopy (STM) for atomic imaging.
Scanning tunneling spectroscopy (STS) for electronic properties.
Characterization across varying bias voltages and epitaxial graphene thicknesses.

Main Results:

Direct evidence of silicon (Si) vacancies at the C_buffer-SiC interface was found.
Si vacancies beneath the C_buffer layer are stable under STM electric fields.
Vacancies introduce localized electronic states below the Fermi level, enhancing charge transfer.

Conclusions:

Si vacancies are a key structural feature of the C_buffer-SiC interface.
These vacancies play a significant role in the electronic properties and charge transfer across the interface.
Understanding these vacancies is crucial for optimizing graphene-SiC heterostructures for electronic applications.