What is the Appropriate Reference Condition for Optimizing Concentrator Cells? Preprint

Research output: Contribution to conferencePaper


This conference paper describes Consensus standards for determining the efficiency of a concentrator cell or module that have not been developed. NREL, Sandia National Laboratory, the Fraunhofer Institute for Solar Energy in Germany, and the Progress in Photovoltaics Efficiency Table authors have informally agreed upon concentrator-cell reference conditions. These conditions are 25?C celltemperature, 1-sun =1000 W/m2 total irradiance, and the ASTM E891-87 direct-normal reference spectrum. Deficiencies in the direct reference spectrum are discussed, and a more representative reference spectrum for evaluating concentrator cells is proposed. The spectrum was generated by the SMARTS model, and the atmospheric parameters are as close as possible to the existing direct spectrum, withthe exception that the aerosol optical depth at 500 nm is reduced from 0.27 to 0.085.
Original languageAmerican English
Number of pages7
StatePublished - 2002
Event29th IEEE PV Specialists Conference - New Orleans, Louisiana
Duration: 20 May 200224 May 2002


Conference29th IEEE PV Specialists Conference
CityNew Orleans, Louisiana

Bibliographical note

Prepared for the 29th IEEE PV Specialists Conference, 20-24 May 2002, New Orleans, Louisiana

NREL Publication Number

  • NREL/CP-520-31405


  • aerosol optical depth
  • cell temperature
  • concentrator cells
  • direct-beam reference spectrum
  • global reference spectrum
  • module
  • multijunction devices
  • one-sun irradiance
  • PV
  • short circuit current (ISC)


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