We may soon be able to create electricity using the screens of our phones, windows in buildings and any other clear surface.
Researchers have created a ‘transparent’ surface that can capture light and convert it into electricity using solar technology.
The team, from Michigan State University, developed organic molecules that are able to take in waves of sunlight which are not visible to the human eye.
It is the first time that a transparent solar concentrator has been created.
Richard Lunt who worked on the research, said that the unique nature of the transparency means we may be able to incorporate it into our everyday lives and create energy from clear surfaces.
“It opens a lot of area to deploy solar energy in a non-intrusive way,” Lunt said. “It can be used on tall buildings with lots of windows or any kind of mobile device that demands high aesthetic quality like a phone or e-reader. Ultimately we want to make solar harvesting surfaces that you do not even know are there.”
As the materials used do not absorb or emit any light that can be seen by the human eye, this means they appear transparent when we look at them.
Instead they rely on infrared light, which is guided to the edge of the material where it is converted to electricity by solar cells.
“No one wants to sit behind colored glass,” explained Lunt. “It makes for a very colorful environment, like working in a disco. We take an approach where we actually make the luminescent active layer itself transparent.
“We can tune these materials to pick up just the ultraviolet and the near infrared wavelengths that then ‘glow’ at another wavelength in the infrared.”
However the future for the technology isn’t yet crystal clear as work needs to be done on improving the energy-producing efficiency.
Currently its solar conversion rate lies close to one percent, but the researchers believe they will be able to get it close to five percent when everything has been fully optimised.
At present coloured variations of the concentrator have efficiency levels of around seven percent.