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Science 21 April 2000:
Vol. 288. no. 5465, pp. 494 - 497
DOI: 10.1126/science.288.5465.494
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Reports

Crossed Nanotube Junctions

M. S. Fuhrer, 1 J. Nygård, 1 L. Shih, 1 M. Forero, 1 Young-Gui Yoon, 1 M. S. C. Mazzoni, 1 Hyoung Joon Choi, 2 Jisoon Ihm, 2 Steven G. Louie, 1 A. Zettl, 1 Paul L. McEuen 1*

Junctions consisting of two crossed single-walled carbon nanotubes were fabricated with electrical contacts at each end of each nanotube. The individual nanotubes were identified as metallic (M) or semiconducting (S), based on their two-terminal conductances; MM, MS, and SS four-terminal devices were studied. The MM and SS junctions had high conductances, on the order of 0.1 e2/h (where e is the electron charge and h is Planck's constant). For an MS junction, the semiconducting nanotube was depleted at the junction by the metallic nanotube, forming a rectifying Schottky barrier. We used two- and three-terminal experiments to fully characterize this junction.

1 Department of Physics, University of California at Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
2 Department of Physics and Center for Theoretical Physics, Seoul National University, Seoul 151-742, Korea.
*   To whom correspondence should be addressed. E-mail: mceuen{at}socrates.berkeley.edu

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