Posting in Energy
FiberCell Inc. and Wake Forest University add a splash of purple to solar cells. The fruit-dye coating may enhance efficiency but can it bring affordable solar energy to developing countries?
Researchers from Wake Forest University's Center for Nanotechnology and an associated company FiberCell Inc. have developed a new solar cell and coating that they say has double the efficiency as current flat-cell technology.
The cells are fiber-based, photovoltaic solar cells for which the European Patent Office issued a patent to WFU in November. Instead of being flat, they contain millions of little canisters, resembling a honeycomb.
According to the scientists, the canisters trap light until the fibers absorb it. The fibers' added surface area allow them to catch light coming in from all angles through the course of the day.
The dye of the pokeberry—a weed native to North and South America, New Zealand, and eastern Asia—boosts the fiber's ability to absorb sunlight. A polymer could fulfill this purpose as well. But pokeberries are cheaper, grow around the world, and grow fast (um, like a weed).
David Carroll, the center's director, says in a statement:
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 fiber cells and provide energy where power lines don't run.
Once the initial manufacturers ship the cells overseas, processors could spray on the pokeberry coating at a local plant. Establishing such a finishing plant, Caroll estimates, would cost around $5 million. Similar plants for flat cells, he says, would be about $20 million.
Top Image: Flickr/Muffet
Bottom Image: FiberCell
May 4, 2010