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Proceedings Paper

Solar spectral variations and their influence on concentrator solar cell performance
Author(s): Lirong Z. Broderick; Brian R. Albert; Brian S. Pearson; Lionel C. Kimerling; Jurgen Michel
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Paper Abstract

A comparative study is performed to quantify the difference in efficiency and spectral sensitivity between a tandem junction and its spectrum splitting parallel junction counterpart. Direct normal solar spectra in a representative sunny site, Tucson, Arizona are calculated using the SPCTRAL2 model at 15-minute intervals throughout a year with real-time meteorological data input. The corresponding efficiencies of the two junctions under 500X concentration at cell temperatures deduced from thermal modeling with real-time ambient temperatures are computed. Both junction structures comprise the same materials, InGaP, GaAs and Ge, and are each optimized to the AM1.5D standard spectrum and cell temperature of 25 C, under which the parallel junction achieves a 1.0% absolute (and 2.5% relative) higher efficiency than the tandem junction. The two junctions are compared for their hourly, daily, and yearly average efficiencies. It is found that the yearly average efficiency of the parallel junction is 2.65% absolute (and 7.31% relative) higher than that of the tandem junction.

Paper Details

Date Published: 9 September 2013
PDF: 7 pages
Proc. SPIE 8821, High and Low Concentrator Systems for Solar Electric Applications VIII, 88210I (9 September 2013); doi: 10.1117/12.2035395
Show Author Affiliations
Lirong Z. Broderick, Massachusetts Institute of Technology (United States)
Brian R. Albert, Massachusetts Institute of Technology (United States)
Brian S. Pearson, Massachusetts Institute of Technology (United States)
Lionel C. Kimerling, Massachusetts Institute of Technology (United States)
Jurgen Michel, Massachusetts Institute of Technology (United States)


Published in SPIE Proceedings Vol. 8821:
High and Low Concentrator Systems for Solar Electric Applications VIII
Adam P. Plesniak, Editor(s)

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