Scanning tunneling spectroscopy of a semiconducting heterojunction nanotube on the Au(1 1 1) surface

H. Kim, J. Lee, S. Lee, Y. J. Song, B. Y. Choi, Y. Kuk, S. J. Kahng

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The atomic and electronic structures of a single-wall carbon nanotube prepared on the Au(1 1 1) surface was studied. We performed scanning tunneling spectroscopy measurement in a semiconducting nanotube heterojunction, obtaining the local electronic density of states. An interface state was observed within the energy gaps of the semiconducting nanotubes. The interface state is spatially localized within a few nm scales and decays into the two semiconducting CNTs with unequal screening lengths. The interface state is donor-like, possibly originating from a heptagonal atomic structure. The interface state is well-understood, in analogy with that of a conventional semiconductor heterojunction.

Original languageEnglish
Pages (from-to)241-245
Number of pages5
JournalSurface Science
Volume581
Issue number2-3
DOIs
Publication statusPublished - 2005 May 1

Keywords

  • Carbon nanotube
  • Scanning tunneling microscope

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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