Solar cell efficiency could double with novel ‘green’ antenna

The use of solar energy in the U.S. is growing, but panels on rooftops are still a rare sight. They cost thousands of dollars, and homeowners don’t recoup costs for years even in the sunniest or best-subsidized locales. But scientists may have a solution. They report today the development of a unique, “green” antenna that could potentially double the efficiencies of certain kinds of solar cells and make them more affordable.