Fraunhofer ISE increased the efficiency of silicon-based monolithic triple-junction solar cells

Researchers at the German Fraunhofer Institute for Solar Energy Systems ISE have raised the efficiency value of monolithic triple-junction solar cells made of silicon and III-V semiconductor materials. Using a combination of multiple absorber materials, these multi-junction photovoltaic cells exploit the energy from the solar spectrum significantly better than conventional silicon solar cells. The world record for a monolithic multi-junction solar cell manufactured by wafer bonding has been increased to 34.1 percent and an efficiency record of 24.3 percent achieved for a solar cell with the III-V semiconductor layers deposited directly on the silicon. »We believe that we can achieve efficiency values of 36 percent, which would substantially exceed the physical limit of 29.4 percent offered by a pure silicon solar cell,« says Andreas Bett, Institute Director of Fraunhofer ISE.

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