Improved Modeling of Photoluminescent and Electroluminescent Coupling in Multijunction Solar Cells

John Geisz, Myles Steiner, Ivan Garcia, Daniel Friedman, Dongchen Lan, Martin Green

Research output: Contribution to journalArticlepeer-review

31 Scopus Citations


Abstract The performance of tandem stacks of Group III-V multijunction solar cells continues to improve rapidly, both through improved performance of the individual cells in the stack and through increase in the number of stacked cells. As the radiative efficiency of these individual cells increases, radiative coupling between the stacked cells becomes an increasingly important factor not only in cell design, but also in accurate efficiency measurement and in determining performance of cells and systems under varying spectral conditions in the field. Past modeling has concentrated on electroluminescent coupling between the cells, although photoluminescent coupling is shown to be important for cells operating near their maximum power point voltage or below or when junction defect recombination is significant. Extension of earlier models is proposed to allow this non-negligible component of luminescent coupling to be included. The refined model is validated by measurement of the closely related external emission from both single and double junction cells.

Original languageAmerican English
Article number7800
Pages (from-to)48-51
Number of pages4
JournalSolar Energy Materials and Solar Cells
StatePublished - 2015

Bibliographical note

Publisher Copyright:
© 2015 Elsevier B.V.

NREL Publication Number

  • NREL/JA-5J00-64910


  • electroluminescent coupling
  • III-V materials
  • photoluminescent coupling
  • radiative coupling
  • tandem solar cells


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