NREL, Swiss scientists create silicon-based multijunction solar cells that reach nearly 36% efficiency

28 Aug 2017   Solar

Researchers at the US Department of Energy’s National Renewable Energy Laboratory (NREL), the Swiss Center for Electronics and Microtechnology (CSEM), and the École Polytechnique Fédérale de Lausanne (EPFL) have created tandem solar cells with record efficiencies of converting sunlight into electricity under 1-sun illumination. Their paper appears in the new issue of Nature Energy . In testing silicon-based multijunction solar cells, the researchers found that the highest dual-junction efficiency (32.8%) came from a tandem cell that stacked a layer of gallium arsenide (GaAs) developed by NREL atop a film of crystalline silicon developed by CSEM. An efficiency of 32.5% was achieved using a gallium indium phosphide (GaInP) top cell, which is a similar structure to the previous record efficiency of 29.8% […]

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