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.
Conference Committee Involvement (1)
High and Low Concentration for Solar Electric Applications III
11 August 2008 | San Diego, California, United States
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