Keywords: PVeff(rev140923).jpg en Conversion efficiencies of best research solar cells worldwide from 1976 through 2014 for various photovoltaic technologies Efficiencies determined by certified agencies/laboratories 2014-09-23 06 37 56 National Renewable Energy Laboratory NREL Golden CO Greg Wilson and Keith Emery other versions PD-USGov Uploaded with UploadWizard NREL best efficiency |