Equivalent circuit models for triple-junction concentrator solar cells

Gideon Segev, Gur Mittelman, Abraham Kribus*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Characterizing the performance of terrestrial multi-junction solar cells under a broad range of sunlight concentration and operating temperatures is important for designing high concentration photovoltaic systems. Experimental data is available for these cells but a satisfactory cell model, calibrated over the full range of these operating conditions, was not yet presented. This study presents single-diode and two-diode equivalent circuit semi-empirical models for InGaP/InGaAs/Ge triple-junction cells, calibrated against available empirical data published by two cell manufacturers. The two-diode model offers a better fit to the experimental values compared to the single diode model. In particular, the two diodes model describes better the dependence of efficiency on concentration. However, some systematic deviations still exist in both models, mainly related to temperature dependence. Based on these results, two further modeling issues are identified as promising directions for further improvement of the models.

Original languageEnglish
Pages (from-to)57-65
Number of pages9
JournalSolar Energy Materials and Solar Cells
Volume98
DOIs
StatePublished - Mar 2012

Keywords

  • CPV
  • Equivalent circuit
  • HCPV
  • Multi-junction cell
  • Temperature coefficient
  • Two-diode model

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