Performance of CPV modules based on vertical multi-junction cells under non-uniform illumination

Gideon Segev, Abraham Kribus*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

High-voltage silicon Vertical Multi-Junction (VMJ) cells can accept high concentration with peak efficiency potentially reaching close to 30%. Dense-array modules with high-voltage cells should allow a parallel connection with voltage matching rather than series connection with current matching, leading to lower mismatch losses under non-uniform illumination. The performance of a dense array with VMJ cells connected in parallel under non-uniform illumination is investigated, in comparison to a module with conventional cells connected in series. The incident flux distribution corresponds to that of a parabolic dish with and without a homogenizer. The number of junctions in each VMJ cell is a free parameter for optimization. The results show a clear advantage of the VMJ module over the conventional module under non-uniform illumination, allowing reduction or even elimination of homogenizing secondary optics, and easing the tracking accuracy requirements.

Original languageEnglish
Pages (from-to)120-128
Number of pages9
JournalSolar Energy
Volume88
DOIs
StatePublished - Feb 2013

Keywords

  • Concentrating photovoltaics
  • Dense array CPV
  • Homogenizer
  • Series mismatch loss

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