Electroluminescence from Electrolyte-Gated Carbon Nanotube Field-Effect Transistors

Sep 08, 2009
Emission spots: A composite image of electroluminescence from an array of carbon nanotubes during a gate voltage scan.

Field-effect transistors (FETs) based on single-walled carbon nanotubes (SWNTs) exhibit a range of optoelectronic effects including near-infrared electroluminescence.

The effect results from the injection of holes and electrons from opposite into the nanotube, where they recombine and emit light.

Advances in the understanding of the charge transport and the factors that affect electroluminescence efficiency in SWNTs are necessary to develop nanoscale light sources.

Researchers at Argonne's Center for Nanoscale Materials, working with scientists at the University of Illinois at Urbana-Champaign, have demonstrated electroluminescence by using highly aligned arrays of SWNTs. Using electrolytes instead of traditional oxide dielectrics facilitates injection and accumulation of high densities of holes and at very low gate voltages.

Numerous emission spots corresponding to individual nanotubes were observed.

Additional tunability of the optoelectronic properties is achieved by introducing thin layers of HfO2 and TiO2 to the gate dielectric.

More information: J. Zaumseil, X. Ho, J. R. Guest, G. P. Wiederrecht, J. A. Rogers, ACS Nano, DOI: 10.1021/nn9005736

Provided by Argonne National Laboratory (news : web)

Explore further: Protons fuel graphene prospects

add to favorites email to friend print save as pdf

Related Stories

Stretching exercises shed new light on nanotubes

Apr 12, 2007

Stretching a carbon nanotube composite like taffy, researchers at the National Institute of Standards and Technology and the Rochester Institute of Technology have made some of the first measurements of how ...

Tiny carbon nanotubes show big germ-fighting potential

Sep 03, 2007

In nanoscience’s version of a David-and-Goliath story, scientists in Connecticut are reporting the first direct evidence that carbon nanotubes have powerful antimicrobial activity, a discovery that could help fight the ...

Carbon Nanotubes for State-of-the-art Packaging

Jul 12, 2004

Carbon Nanotechnologies, Inc (CNI) and Kostat, Inc. today announced a joint development agreement to develop and commercialise conductive polymers for electronics module trays, carrier tapes and other electronics related ...

New Flexible, Transparent Transistors made of Nanotubes

Nov 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 ...

Recommended for you

Protons fuel graphene prospects

2 hours ago

Graphene, impermeable to all gases and liquids, can easily allow protons to pass through it, University of Manchester researchers have found.

Cooling with the coldest matter in the world

Nov 24, 2014

Physicists at the University of Basel have developed a new cooling technique for mechanical quantum systems. Using an ultracold atomic gas, the vibrations of a membrane were cooled down to less than 1 degree ...

Magnetic fields and lasers elicit graphene secret

Nov 24, 2014

Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) have studied the dynamics of electrons from the "wonder material" graphene in a magnetic field for the first time. This led to the discovery of ...

User comments : 0

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.