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Proceedings Paper

Daily fill factor variation as a diagnostic probe of multijunction concentrator systems during outdoor operation
Author(s): William E. McMahon; Keith E. Emery; Daniel J. Friedman; Larry Ottoson; Michelle S. Young; J. Scott Ward; Charlene M. Kramer; Anna Duda; Sarah Kurtz
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Paper Abstract

Optimizing a concentrator system which uses multijunction solar cells is challenging because: (a) the conditions are variable, so the solar cells rarely operate under optimal conditions and (b) the conditions are not controlled, so any design problems are difficult to characterize. Any change in the spectral content of direct-beam sunlight as it passes through the concentrator optics is of particular interest, as it can reduce the performance of multijunction cells and is difficult to characterize. Here we show how the fill factor can be used to detect and diagnose this sort of a "spectral skewing" by the concentrator optics during outdoor operation. The work presented here is for GaInP2/GaAs tandem cells, but the conclusions are equally valid for GaInP2/GaAs/Ge triple-junction cells.

Paper Details

Date Published: 11 September 2007
PDF: 8 pages
Proc. SPIE 6649, High and Low Concentration for Solar Electric Applications II, 664906 (11 September 2007); doi: 10.1117/12.732604
Show Author Affiliations
William E. McMahon, National Renewable Energy Lab. (United States)
Keith E. Emery, National Renewable Energy Lab. (United States)
Daniel J. Friedman, National Renewable Energy Lab. (United States)
Larry Ottoson, National Renewable Energy Lab. (United States)
Michelle S. Young, National Renewable Energy Lab. (United States)
J. Scott Ward, National Renewable Energy Lab. (United States)
Charlene M. Kramer, National Renewable Energy Lab. (United States)
Anna Duda, National Renewable Energy Lab. (United States)
Sarah Kurtz, National Renewable Energy Lab. (United States)


Published in SPIE Proceedings Vol. 6649:
High and Low Concentration for Solar Electric Applications II
Martha Symko-Davies, Editor(s)

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