Solar panels at Tivoli Gardens in Copenhagen. (Credit: Flickr @ David Gilford http://www.flickr.com/photos/complexify/)Researchers at Umeå University in Sweden have discovered that a controlled placement of carbon nanotubes into nanotube networks produces a huge boost in electronic performance.
Carbon nanotubes, CNTs, are one dimensional nanoscale cylinders made of carbon atoms that possess very unique properties. For example, they have very high tensile strength and exceptional electron mobility, which make them very attractive for the next generation of organic and carbon-based electronic devices.
There is an increasing trend of using carbon based nanostructured materials as components in solar cells. Due to their exceptional properties, carbon nanotubes are expected to enhance the performance of current solar cells through efficient charge transport inside the device. However, in order to obtain the highest performance for electronic applications, the carbon nanotubes must be assembled into a well-ordered interconnected nanotube network. Unfortunately, conventional methods used today are far from optimal which results in low device performance.
In a new study, a team of physicists and chemists at Umeå University have joined forces to produce nano-engineered carbon nanotube networks with novel properties.
For the first time, the researchers show that carbon nanotubes can be engineered into complex network architectures, and with controlled nano-scale dimensions inside a polymer matrix.
“We have found that the resulting nano networks possess exceptional ability to transport charges, up to 100 million times higher than previously measured carbon nanotube random networks produced by conventional methods,” says Dr David Barbero, leader of the project and assistant professor at the Department of Physics at Umeå University.
The high degree of control of the method enables production of highly efficient nanotube networks with a very small amount of nanotubes compared to other conventional methods, thereby strongly reducing materials costs.
Barbero, D., Boulanger, N., Ramstedt, M., & Yu, J. (2014). Nano-Engineering of SWNT Networks for Enhanced Charge Transport at Ultralow Nanotube Loading Advanced Materials DOI: 10.1002/adma.201305843
