Archive - Jul 10, 2008

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Researchers at MIT have created a new way to harness the sun's energy - by turning windows in big buildings into solar panels. The new technology, dubbed solar concentrators, harvests light over a wide area such as a window pane and then concentrates or gathers it at the window's edges, said Marc Baldo, a professor at MIT and head of the effort. Three members of the research team, which is publishing its findings in Friday's edition of Science, are in the process of incorporating a startup called Covalent Solar to develop the technology. The team has spent two years identifying organic dyes, painted onto glass or plastic, that can effectively concentrate the sun’s light onto solar cells, enabling them to produce more electricity from fewer cells.

The dyes basically reflect the light (technically, it’s actually absorbed and then sent back out), so that some of it is trapped inside the plane of glass, said Jon Mapel, a member of the research team. With the help of a scientific principal called "internal refraction," which is the same principal that keeps light trapped in optical fibers, the light bounces to the edges of the glass, which have been equipped with strips of solar cells that convert it into electricity.  read more »