University of Illinois Urbana-Champaign

Properties of graphene nanoribbons obtained by chemical vapor deposition

Lyons, Austin

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Lyons_Austin.pdf

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https://hdl.handle.net/2142/29653

Description

Title
Properties of graphene nanoribbons obtained by chemical vapor deposition
Author(s)
Lyons, Austin
Issue Date
2012-02-06T20:08:58Z
Director of Research (if dissertation) or Advisor (if thesis)
Pop, Eric
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Date of Ingest
2012-02-06T20:08:58Z
Keyword(s)
  • graphene
  • nanoribbons
  • chemical vapor deposition (CVD)
  • current density
  • interconnects
  • breakdown
  • mobility
  • transistors
  • chemical vapor deposition
Abstract
We use chemical vapor deposition (CVD) to synthesize graphene films on copper foil. After transferring the graphene to SiO2/Si substrates, we pattern the film into graphene nanoribbons (GNRs) of width < ~50 nm and length < ~ 700 nm with Ti/Au contacts. We perform low-bias, high-bias, and temperature-dependent electrical measurements. CVD-grown GNRs have mobility values from 100 to 500 cm2V-1s-1 and current densities up to ~3 mA/μm, suggesting that polycrystalline graphene grain boundaries play a limited role in the CVD-GNR electrical properties. CVD-GNR Raman spectra are comparable to lithographically patterned GNRs from exfoliated graphene. We fit our experimental data using a self-consistent model that includes GNR fringing capacitance and observe a weak temperature dependence of CVD-GNR mobility. We find a square root dependence of maximum current density on GNR resistance, implying that breakdown is primarily due to Joule heating. The electrical characteristics of CVD-GNRs illustrate the promise of wafer-scale graphene integration while revealing variability, contacts, and impurities as future challenges for improving performance.
Graduation Semester
2011-12
Permalink
http://hdl.handle.net/2142/29653
Copyright and License Information
Copyright 2011 Austin Lyons

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