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

Citation data:

Surface Science, ISSN: 0039-6028, Vol: 581, Issue: 2, Page: 241-245

Publication Year:
2005
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Citations 3
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Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/7117
DOI:
10.1016/j.susc.2005.03.001
Author(s):
H. Kim; J. Lee; S. Lee; Y. J. Song; B. Y. Choi; Y. Kuk; S. J. Kahng
Publisher(s):
Elsevier BV; ELSEVIER SCIENCE BV
Tags:
Physics and Astronomy; Materials Science; Carbon nanotube; Scanning tunneling microscope
article description
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.