Jpn. J. Appl. Phys. 44 (2005) pp. 1603-1605 |Previous Article| |Next Article| |Table of Contents|
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Selected Topics in Applied Physics
New Advances in Carbon Nanotube:
From New Growth Processes to Nanodevices
Electrical Heating Process for p-Type to n-Type Conversion of Carbon Nanotube Field Effect Transistors
1The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
2National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
3CREST, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan
(Received October 20, 2004; accepted December 9, 2004; published April 8, 2005)
A new electrical heating process was proposed which converts carbon nanotubes from p-type to n-type by desorption of oxygen molecules around the carbon nanotubes. By applying a large voltage of ∼40 V between the source and drain electrodes in vacuum, a large drain current of ∼20 µA flows the carbon nanotube channel and heats it, which cause oxygen molecules to desorb from the surface of the carbon nanotube. After applying electrical heating, the carbon nanotube field effect transistors clearly showed n-type properties. Moreover, they recovered p-type properties when exposed to ambient air.
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