Electrical contacts to carbon nanotubes down to 1 nm in diameter

Woong Kim, Ali Javey, Ryan Tu, Jien Cao, Qian Wang, Hongjie Dai

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227 Citations (Scopus)


Rhodium (Rh) is found similar to Palladium (Pd) in making near-Ohmic electrical contacts to single-walled carbon nanotubes (SWNTs) with diameters d>∼1.6 nm. Non-negligible positive Schottky barriers (SBs) exist between Rh or Pd and semiconducting SWNTs (S -SWNTs) with d<∼1.6 nm. With Rh and Pd contacts, the characteristics of SWNT field-effect transistors and SB heights at the contacts are largely predictable based on the SWNT diameters, without random variations among devices. Surprisingly, electrical contacts to metallic SWNTs (M-SWNTs) also appear to be diameter dependent especially for small SWNTs. Ohmic contacts are difficult for M-SWNTs with diameters ≤∼1.0 nm possibly due to tunnel barriers resulted from large perturbation of contacting metal to very small diameter SWNTs due to high chemical reactivity of the latter.

Original languageEnglish
Article number173101
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Issue number17
Publication statusPublished - 2005 Oct 24
Externally publishedYes

Bibliographical note

Funding Information:
The authors acknowledge insightful discussions with K. J. Cho. This work was supported by MARCO MSD Focus Center.

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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