High-mobility semiconducting carbon nanotubes

April 29, 2004
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

Related Stories

Carbon nanotubes self-assemble into tiny transistors

April 5, 2017

Carbon nanotubes can be used to make very small electronic devices, but they are difficult to handle. University of Groningen scientists, together with colleagues from the University of Wuppertal and IBM Zurich, have developed ...

Excitons play peek-a-boo on carbon nanotubes

June 7, 2007

In the quantum world, photons and electrons dance, bump and carry out transactions that govern everything we see in the world around us. In this week's issue of Science, French and U.S. scientists describe a new technique ...

New Flexible, Transparent Transistors made of Nanotubes

November 27, 2007

The ability to create flexible, transparent electronics could lead to a host of novel applications, such as e-paper and electronic car windshields. Now, scientists have constructed a transistor made of a network of nanotubes ...

Recommended for you

Looking to the sun to create hydrogen fuel

January 18, 2018

When Lawrence Livermore scientist Tadashi Ogitsu leased a hydrogen fuel-cell car in 2017, he knew that his daily commute would change forever. There are no greenhouse gases that come out of the tailpipe, just a bit of water ...

A new, dynamic view of chromatin movements

January 18, 2018

In cells, proteins tightly package the long thread of DNA into pearl necklace-like complexes known as chromatin. Scientists at EPFL show for the first time how chromatin moves, answering longstanding questions about how its ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.