Measurements of Six-Junction Concentrator Solar Cells

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Accurate measurements of six-junction inverted metamorphic concentrator solar cells under AM1.5 direct spectrum are obtained by adjusting the spectrum of a tunable high-intensity solar simulator with custom mirrors. Isotype reference cells and broadband InGaAs QE calibration cells were developed for accurate measurements. Modeling and varying the illumination show that an unavoidable 15% - 17% overillumination on the sixth junction does not result in significant error of these 6J IMM devices. Spectrally adjusted flash measurements are independently confirmed by NREL's Cell and Module Performance team. Concentration measurements of a 6J IMM solar cell resulted in 47.1 ± 3.2% (absolute) efficiency at 143 suns.
Original languageAmerican English
Number of pages8
StatePublished - 2020
Event2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, Illinois
Duration: 16 Jun 201921 Jun 2019


Conference2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)
CityChicago, Illinois

NREL Publication Number

  • NREL/CP-5900-74038


  • inverted metamorphic
  • six junction
  • solar cell measurements


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