1994: NREL Constructs Efficient Solar Cell
The National Renewable Energy Laboratory (see 1994) develops a solar cell made from gallium indium phosphide and gallium arsenide that exceeds 30% conversion efficiency. [US Department of Energy, 2002 
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The National Renewable Energy Laboratory (see 1994) develops a solar cell made from gallium indium phosphide and gallium arsenide that exceeds 30% conversion efficiency. [US Department of Energy, 2002 ]