Alta Devices announces 31.6% efficiency for dual-junction solar cell

US solar cell manufacturer Alta Devices, a unit of Chinese solar company Hanergy Thin Film, announced it has achieved a 31.6% efficiency for its dual-junction solar cell. The result, which was certified by the US Energy Department’s NREL National Renewable Energy Laboratory (NREL). beats the company's previous record of 30.8%. Alta Devices’ use of gallium arsenide (GaAs) allows its dual- and single-junction solar cells to produce these conversion efficiencies. Alta Devices said it achieved a new record efficiency by modifying its basic »single-junction« gallium arsenide (GaAs) material.  
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