Search Menu
Photonics Media Photonics Marketplace Photonics Spectra BioPhotonics Vision Spectra Photonics Showcase Photonics ProdSpec Photonics Handbook

Stress Activates Light-Emitting Nanowires

Facebook Twitter LinkedIn Email
Stretching and compressing gallium arsenide nanowires switches their light emission on and off, respectively. 

Enabled by the material’s hexagonal wurtzite structure, this discovery could enable novel devices that function as LEDs or light detectors, depending on whether they are compressed or stretched, according to investigators at IBM Research in Zurich. Current technologies use different materials to realize these two distinct functions: silicon or germanium for light detection and III-V semiconductors for light emission.

“We have now discovered that when you pull the nanowire along its length … the material has a direct bandgap and it can emit light very efficiently,” said Dr. Giorgio Signorello of IBM. “When instead you compress the length of the wire, its electronic properties change and the material stops emitting light. … We call this state pseudo-direct: The III-V material behaves similarly to silicon or germanium and becomes a good light detector.”

A team at the Norwegian University of Science and Technology supplied the nanowire material. Led by Dr. Helge Weman, researchers there have been developing ways to grow nanowires from semiconductors and studying their properties since 2010. Over the last two years, they have been growing GaAs nanowires on graphene using molecular beam epitaxy. 

“We are showing how to use graphene to make much more effective and flexible electronic products, initially solar cells and white [LEDs]. The future holds much more advanced applications,” Weman said. Those applications include pressure sensors or electricity harvesting. 

The research is published in Nature Communications (doi:10.1038/ncomms4655).

Photonics Spectra
Jul 2014
ConsumerenergyEuropegallium arsenidegrapheneIBMindustriallight sourcesmaterialsmolecular beam epitaxynanonanowiresNorwegian University of Science and TechnologyopticsResearch & Technologysolar powerTech PulseTrondheimHelge WemanwurtziteLEDs

back to top
Facebook Twitter Instagram LinkedIn YouTube RSS
©2023 Photonics Media, 100 West St., Pittsfield, MA, 01201 USA, [email protected]

Photonics Media, Laurin Publishing
x Subscribe to Photonics Spectra magazine - FREE!
We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.