Short channel field-effect transistors from highly enriched semiconducting carbon nanotubes


Semiconducting single-walled carbon nanotubes (s-SWNTs) with a purity of ∼98% have been obtained by gel filtration of arc-discharge grown SWNTs with diameters in the range 1.2–1.6 nm. Multi-laser Raman spectroscopy confirmed the presence of less than 2% of metallic SWNTs (m-SWNTs) in the s-SWNT enriched sample. Measurement of ∼50 individual tubes in Pd-contacted devices with channel length 200 nm showed on/off ratios of >104, conductances of 1.38–5.8 μS, and mobilities in the range 40–150 cm2·V/s. Short channel multi-tube devices with ∼100 tubes showed lower on/off ratios due to residual m-SWNTs, although the on-current was greatly increased relative to the devices made from individual tubes.

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Correspondence to Hongjie Dai.

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Wu, J., Xie, L., Hong, G. et al. Short channel field-effect transistors from highly enriched semiconducting carbon nanotubes. Nano Res. 5, 388–394 (2012).

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  • Single-walled carbon nanotubes
  • separation
  • Raman spectroscopy
  • field-effect transistor