High-mobility semiconducting carbon nanotubes

Nanotube

T Durkop, B M Kim and M S Fuhrer reviewed experiments to determine the resistivity and charge-carrier mobility in semiconducting carbon nanotubes in Journal of Physics: Condens. Matter (vol. 16, 2004, R553-R580)
Electron transport experiments on long chemical-vapour-deposition-grown semiconducting carbon nanotubes are interpreted in terms of diffusive transport in a field-effect transistor. This allows for extraction of the field-effect and saturation mobilities for hole carriers, as well as an estimate of the intrinsic hole mobility of the nanotubes. The intrinsic mobility can exceed 100 000 cm2 V-1 s-1 at room temperature, which is greater than any other known semiconductor.

Scanned-probe experiments show a low degree of disorder in chemical-vapour-deposition-grown semiconducting carbon nanotubes compared with laser-ablation produced nanotubes, and show conductivity and mean-free-path consistent with the high mobility values seen in transport experiments.

The results indicate that semiconducting nanotubes should be an excellent material for a number of semiconductor applications, especially in high-speed transistors where mobility is crucial.

The application of high-mobility semiconducting nanotubes to charge detection and
memory is also reviewed; it is shown that single electronic charges may be
detected with a semiconducting nanotube field-effect transistor at operating
temperatures up to 200 K.

The results suggest that semiconducting nanotubes may find applications as exquisite sensors of e.g. chemical or biochemical species, in which a chemical signal is translated into charge. Single molecule detection appears feasible with such a device.


Explore further

Carbon nanotube transistors could lead to inexpensive, flexible electronics

Citation: High-mobility semiconducting carbon nanotubes (2004, April 29) retrieved 11 July 2020 from https://phys.org/news/2004-04-high-mobility-semiconducting-carbon-nanotubes.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
0 shares

Feedback to editors

User comments