GaInP/SHJ tandem solar PV cells with efficiency up to 29.8% under 1-sun standard illumination
NREL and CSEM scientists have jointly set a new world record for converting non-concentrated (1-sun) sunlight into electricity using a dual-junction III-V/Si solar cell. The newly conversion efficiency of 29.8% was set using a top cell made of gallium indium phosphide developed by NREL, and a bottom cell made of crystalline silicon developed by CSEM using silicon heterojunction technology. The two cells were made separately and then stacked by NREL.
“It’s a record within this mechanically stacked category,” said David Young, a senior researcher at NREL. “The performance of the dual-junction device exceeded the theoretical limit of 29.4% for crystalline silicon solar cells.”
“We believe that the silicon heterojunction technology is today the most efficient silicon technology for application in tandem solar cells” said Christophe Ballif, head of PV activities at CSEM.
A new design for the dual-junction solar cell and the contributions from CSEM were key to setting the record. These first collaboration results further indicate that even greater efficiency can be achieved by the combination of NREL and CSEM cells.  http://www.solarserver.com/solar-magazine/solar-news/current/2016/kw01/nrel-csem-set-new-efficiency-record-with-dual-junction-solar-pv-cell.html http://www.nrel.gov/news/press/2016/21613
http://onlinelibrary.wiley.com/doi/10.1002/pip.2728/full
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