Lattice-Matched and Metamorphic GaInP/GaInAs/Ge Concentrator Solar Cells

R. R. King, C. M. Fetzer, P. C. Colter, K. M. Edmondson, D. C. Law, A. P. Stavrides, H. Yoon, G. S. Kinsey, H. L. Cotal, J. H. Ermer, R. A. Sherif, K. Emery, W. Metzger, R. K. Ahrenkiel, N. H. Karam

Research output: Contribution to conferencePaperpeer-review

39 Scopus Citations


Recent developments in epitaxial III-V multijunction solar cell technology have allowed concentrator and 1-sun cells to reach new heights in efficiency under the terrestrial solar spectrum. The bandgaps of the GaInP and GalnAs subcells are controlled by varying indium content, up to 12% indium in the GainAs middle cell, or 0.8% lattice mismatch. Shockley-Read-Hall recombination at dislocations in such metamorphic cells has been restricted to lower levels than previously achieved, and is compared to the lattice-matched case. Terrestrial GaInP/GaInAs/Ge 3-junction cells have been produced at Spectrolab with record efficiencies independently verified at NREL, of 31.3% for metamorphic 1-sun cells and 32.0% for lattice-matched 1-sun cells (25°C, AM1.5G, 4.00 cm 2), and 35.2% for lattice-matched concentrator cells under the AM1.5 Direct, low-AOD spectrum (25°C, 66 suns, 0.26 cm 2).

Original languageAmerican English
Number of pages4
StatePublished - 2003
EventProceddings of the 3rd World Conference on Photovoltaic Energy Conversion - Osaka, Japan
Duration: 11 May 200318 May 2003


ConferenceProceddings of the 3rd World Conference on Photovoltaic Energy Conversion

NREL Publication Number

  • NREL/CP-520-36512


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