By IANS,
Washington : Pokeberries – weeds that children smash to stain their cheeks purple-red – could be the key to spreading solar power across the globe, according to researchers.
Scientists from Wake Forest University’s (WFU) Centre for Nanotechnology used the red dye made from pokeberries to coat their efficient and inexpensive fibre-based solar cells. The dye acts as an absorber, helping the cell’s tiny fibres trap more sunlight to convert into power.
Pokeberries proliferate even during drought and in rocky, infertile soil. That means residents of rural Africa, for instance, could raise the plants for pennies.
Then they could make the dye absorber for the extremely efficient fibre cells and provide energy where power lines don’t run, said David Carroll, the centre’s director. “They’re weeds,” Carroll said. “They grow on every continent but Antarctica.”
WFU holds the first patent for fibre-based photovoltaic or solar cells, granted by the European Patent Office in November. A company called FiberCell Inc. has received the licence to develop manufacturing methods for the new solar cell.
The fibre cells can produce as much as twice the power that current flat-cell technology can produce. That’s because they are composed of millions of tiny plastic “cans” that trap light until most of it is absorbed.
Since the fibres create much more surface area, the fibre solar cells can collect light at any angle – from the time the sun rises until it sets.
To make the cells, the plastic fibres are stamped onto plastic sheets, with the same technology used to attach the tops of soft-drink cans, said a WFU release.
The absorber – either a polymer or a less-expensive dye – is sprayed on. The plastic makes the cells lightweight and flexible, so a manufacturer could roll them up and ship them cheaply to developing countries – to power a medical clinic, for instance.
Once the primary manufacturer ships the cells, workers at local plants would spray them with the dye and prepare them for installation. Carroll estimates it would cost about $5 million to set up a finishing plant – about $15 million less than it could cost to set up a similar plant for flat cells.