Multijunction Solar Cells for Conversion of Concentrated Sunlight to Electricity

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Solar-cell efficiencies have exceeded 40% in recent years. The keys to achieving these high efficiencies include: 1) use of multiple materials that span the solar spectrum, 2) growth of these materials with near-perfect quality by using epitaxial growth on single-crystal substrates, and 3) use of concentration. Growth of near-perfect semiconductor materials is possible when the lattice constants of the materials are matched or nearly matched to that of a single-crystal substrate. Multiple material combinations have now demonstrated efficiencies exceeding 40%, motivating incorporation of these cells into concentrator systems for electricity generation. The use of concentration confers several key advantages.

Original languageAmerican English
Pages (from-to)A73-A78
JournalOptics Express
Issue number101
StatePublished - 2010

NREL Publication Number

  • NREL/JA-520-47420


  • photodiodes
  • thin film devices and appliances


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