Arrays of single-walled carbon nanotubes with full surface coverage for high-performance electronics

Qing Cao, Shu Jen Han, George S. Tulevski, Yu Zhu, Darsen D. Lu, Wilfried Haensch

Research output: Contribution to journalArticlepeer-review


Single-walled carbon nanotubes have exceptional electronic properties and have been proposed as a replacement for silicon in applications such as low-cost thin-film transistors and high-performance logic devices. However, practical devices will require dense, aligned arrays of electronically pure nanotubes to optimize performance, maximize device packing density and provide sufficient drive current (or power output) for each transistor. Here, we show that aligned arrays of semiconducting carbon nanotubes can be assembled using the Langmuir-Schaefer method. The arrays have a semiconducting nanotube purity of 99% and can fully cover a surface with a nanotube density of more than 500 tubes/μm. The nanotube pitch is self-limited by the diameter of the nanotube plus the van der Waals separation, and the intrinsic mobility of the nanotubes is preserved after array assembly. Transistors fabricated using this approach exhibit significant device performance characteristics with a drive current density of more than 120 μA μm-1, transconductance greater than 40 μS μm-1 and on/off ratios of ∼1 × 10 3.

Original languageEnglish (US)
Pages (from-to)180-186
Number of pages7
JournalNature Nanotechnology
Issue number3
StatePublished - Mar 2013
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering
  • General Materials Science
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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