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Related Experiment Video

Updated: May 11, 2026

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

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Published on: July 24, 2015

Optimizing electronic structure and quantum transport at the graphene-Si(111) interface: an ab initio

Ceren Tayran¹, Zhen Zhu, Matteo Baldoni

¹Physics and Astronomy Department, Michigan State University, East Lansing, Michigan 48824, USA.

Physical Review Letters

|May 18, 2013

Summary

Graphene forms a wavy structure on silicon surfaces, creating conductive ridges for high mobility and efficient carrier injection. This novel structure enhances graphene

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Area of Science:

Materials Science
Condensed Matter Physics
Surface Science

Background:

Graphene's unique electronic properties make it a promising material for next-generation electronics.
Understanding graphene's interaction with semiconductor substrates is crucial for device integration.
The Si(111) surface is a common substrate for epitaxial growth and surface studies.

Purpose of the Study:

To investigate the structural and electronic properties of a graphene monolayer on a Si(111) surface.
To determine the nature of the interaction and bonding between graphene and the Si substrate.
To explore the impact of the resulting structure on graphene's charge transport characteristics.

Main Methods:

Ab initio density-functional theory calculations were employed to model the graphene-Si(111) interface.
Quantum transport calculations were performed for various interface geometries.
Analysis of bonding configurations, lattice mismatch accommodation, and electronic band structure.

Main Results:

Graphene forms strong covalent bonds with the Si(111) surface.
A wavy graphene structure emerges to accommodate the 12% lattice mismatch.
This structure features free-standing conductive graphene ridges connected by ribbon-like regions bonded to the substrate.
Quantum transport calculations reveal high charge carrier mobility along the ridges and efficient carrier injection at the contact regions.

Conclusions:

The wavy graphene structure on Si(111) offers a unique combination of properties for electronic applications.
High carrier mobility in the free-standing ridges and efficient injection into Si are key advantages.
This study provides insights into designing graphene-based heterostructures with tailored electronic functionalities.