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Solar Cell Breaks Efficiency Record

Recycling photons raises the energy output

3 min read

24 June 2011—A photovoltaic cell that reaches record-breaking efficiency could make solar energy competitive with fossil fuels, says the company that created the cell.

Alta Devices, a start-up in Santa Clara, Calif., presented research at the 37th IEEE Photovoltaic Specialist Conference, in Seattle, this week that claims its thin-film gallium-arsenide cell can convert 27.6 percent of the sunlight striking the cell into electricity, under standardized conditions. Since the paper was submitted, the company says it has upped the efficiency to 28.2 percent. That beats the previous record of 26.4 percent for a solar cell with a single p-n junction, which was the first improvement in years over 26.1 percent. Both numbers, according to Alta, were independently confirmed by the National Renewable Energy Laboratory.

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Greg Mably


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