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sábado, 20 de fevereiro de 2010

Painéis solares a sério?

Os painéis solares atuais são uma anedota...
Estes, vão ter 90% de eficiência!

Low-cost, more efficient solar cells mostly plastic

PORTLAND, Ore. — By growing arrays of silicon wires in a polymer substrate, researchers have demonstrated what they say are flexible solar cells that absorb up to 96 percent of incident light.

Photomicrograph of a silicon wire array embedded within a transparent, flexible polymer film. Credit: Caltech/Michael Kelzenberg

California Institute of Technology (Caltech) researchers said the wires are made up of 98 percent plastic, potentially lowering the cost of photovoltaics by using just 1/50th the amount of semiconductor material used today. In tests, the experimental solar cells demonstrated over 90 percent quantum efficiency, compared with 25 percent for the best silicon solar cells.

"By developing light-trapping techniques for relatively sparse wire arrays, not only did we achieve suitable absorption, but we also demonstrated effective optical concentration," claimed Harry Atwater, director of Caltech's Resnick Institute.


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