High-Performance Concentrator Tandem Solar Cells Based on IR-Sensitive Bottom Cells

M. W. Wanlass, J. S. Ward, K. A. Emery, T. A. Gessert, C. R. Osterwald, T. J. Coutts

Research output: Contribution to journalArticlepeer-review

32 Scopus Citations


Computer simulations of two-junction, concentrator tandem solar cell performance show that IR-sensitive bottom cells are required to achieve high efficiencies. Based on this conclusion, two novel concentrator tandem designs are under investigation: (1) a mechanically stacked, four-terminal GaAs/GaInAsP (0.95 eV) tandem, and (2) a monolithic, lattice-matched, three-terminal InP/GaInAs tandem. In preliminary experiments, terrestrial concentrator efficiencies exceeding 30% have been achieved with each of the above tandem designs. Methods for improving the efficiency of each tandem type are discussed.

Original languageAmerican English
Pages (from-to)363-371
Number of pages9
JournalSolar Cells
Issue number1-4
StatePublished - 1991

NREL Publication Number

  • ACNR/JA-213-12428


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