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40% efficient metamorphic GaInP/GaInAs/Ge multijunction solar cells

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8 Author(s)
King, R.R. ; Spectrolab, Inc., 12500 Gladstone Ave., Sylmar, California 91342 ; Law, D.C. ; Edmondson, K.M. ; Fetzer, C.M.
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An efficiency of 40.7% was measured and independently confirmed for a metamorphic three-junction GaInP/GaInAs/Ge 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 GaxIn1-xAs and GaxIn1-xP materials, and fundamental power losses are quantified to identify paths to still higher efficiencies.

Published in:

Applied Physics Letters  (Volume:90 ,  Issue: 18 )

Date of Publication:

Apr 2007

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