Photo-thermoelectric effect at a graphene interface junction

Xiaodong Xu, Nathaniel M. Gabor, Jonathan S. Alden, Arend M. Van Der Zande, Paul L. McEuen

Research output: Contribution to journalArticle

Abstract

We investigate the optoelectronic response of a graphene single-bilayer interface junction using photocurrent (PC) microscopy. We measure the polarity and amplitude of the PC while varying the Fermi level by tuning a gate voltage. These measurements show that the generation of PC is by a photothermoelectric effect. The PC displays a factor of ∼10 increase at the cryogenic temperature as compared to room temperature. Assuming the thermoelectric power has a linear dependence on the temperature, the inferred graphene thermal conductivity from temperature dependent measurements has a T1.5 dependence below ∼100 K, which agrees with recent theoretical predictions.

Original languageEnglish (US)
Pages (from-to)562-566
Number of pages5
JournalNano letters
Volume10
Issue number2
DOIs
StatePublished - Feb 10 2010
Externally publishedYes

Keywords

  • Graphene
  • Photo-thermoelectric effect
  • Photocurrent

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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