40% efficient metamorphic GaInPGaInAsGe multijunction solar cells

R. R. King, D. C. Law, K. M. Edmondson, C. M. Fetzer, G. S. Kinsey, H. Yoon, R. A. Sherif, N. H. Karam

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987 Scopus citations


An efficiency of 40.7% was measured and independently confirmed for a metamorphic three-junction GaInPGaInAsGe cell under the standard spectrum for terrestrial concentrator solar cells at 240 suns (24.0 W cm2, AM1.5D, low aerosol optical depth, 25 °C). This is the initial demonstration of a solar cell with over 40% efficiency, and is the highest solar conversion efficiency yet achieved for any type of photovoltaic device. Lattice-matched concentrator cells have now reached 40.1% efficiency. Electron-hole recombination mechanisms are analyzed in metamorphic Gax In1-x As and Gax In1-x P materials, and fundamental power losses are quantified to identify paths to still higher efficiencies.

Original languageEnglish (US)
Article number183516
JournalApplied Physics Letters
Issue number18
StatePublished - May 10 2007

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    King, R. R., Law, D. C., Edmondson, K. M., Fetzer, C. M., Kinsey, G. S., Yoon, H., Sherif, R. A., & Karam, N. H. (2007). 40% efficient metamorphic GaInPGaInAsGe multijunction solar cells. Applied Physics Letters, 90(18), [183516]. https://doi.org/10.1063/1.2734507