Enhancement of field emission transport by molecular tilt configuration in metal-molecule-metal junctions

Gunuk Wang, Tae Wook Kim, Gunho Jo, Takhee Lee

Research output: Contribution to journalArticle

65 Citations (Scopus)


We studied the molecular configuration-dependent charge transport of alkyl metal-molecule-metal junctions using conducting atomic force microscopy (CAFM). The inflection point (or transition voltage V T) on the plot of In(1/V 2) versus 1/V shifted to a lower voltage with increasing CAFM tip-loading force and decreasing molecular length. Our results indicate that the reduction of gap distance by molecular tilt configuration enhances the transition of the electronic transport mechanism from direct tunneling to field emission transport through molecules. The obtained results are consistent with a barrier height decrease, as affected by the enhancement of the intermolecular chain-to-chain tunneling as molecular tilt, predicted by a multibarrier tunneling model.

Original languageEnglish
Pages (from-to)5980-5985
Number of pages6
JournalJournal of the American Chemical Society
Issue number16
Publication statusPublished - 2009 Apr 29
Externally publishedYes


ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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