Scientists set a new world record for converting non-concentrated sunlight into electricity using a dual-junction III-V/Si solar cell. A joint effort between the National Renewable Energy Laboratory (NREL) and the Swiss Center for Electronics and Microtechnology (CSEM) has resulted in a novel tandem solar cell that operates at 29.8% conversion efficiency under 1-sun conditions. The new solar cell technology combines NREL’s 1.8-eV gallium indium phosphide (GaInP) technology as a top cell and CSEM’s crystalline silicon (Si) hetero junction technology as a bottom cell.

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