Optical Characterization of III-V Multijunction Solar Cells for Temperature-Independent Band Gap Features

Hans Baumgartner, Benjamin Oksanen, Petri Karha, Erkki Ikonen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

A recently developed method to characterize the band gap energies of III-V optosemiconductors was utilized to determine temperature-invariant band gap features of multijunction solar cells. The method is based on measuring electroluminescent spectra of the solar cells at different temperatures. The normalized spectra reveal temperature-invariant energy values of the different junctions which are further converted to band gap energies. The method utilization requires a calibrated spectroradiometer and a temperature controlled mounting base for the solar cell under test, however, no knowledge about the absolute temperature of the cell under measurement. The method was tested on GaAs and GaInP solar cells that consist of single and dual junctions. The band gap energies were also derived from spectral response measurements. The differences of the determined band gap energies from the literature values were smaller than 1.1%. Compared with other band gap determination methods, the developed method yields temperature-invariant band gap characteristics; with a known uncertainty, that separated the different junctions in a multijunction device without individual biasing for the different junctions. In addition, a temperature-independent characterization parameter ensures that the operating conditions of the device under test do not affect the results.

Original languageEnglish
Article number8827497
Pages (from-to)1631-1636
Number of pages6
JournalIEEE Journal of Photovoltaics
Volume9
Issue number6
DOIs
Publication statusPublished - Nov 2019
MoE publication typeA1 Journal article-refereed

Fingerprint

Energy gap
solar cells
Solar cells
Temperature
temperature
spectroradiometers
mounting
Multi-junction solar cells
Mountings
spectral sensitivity
cells
energy

Keywords

  • Band gap
  • III-V solar cells
  • light-emitting diode (LED)
  • spectral response
  • temperature

Cite this

Baumgartner, Hans ; Oksanen, Benjamin ; Karha, Petri ; Ikonen, Erkki. / Optical Characterization of III-V Multijunction Solar Cells for Temperature-Independent Band Gap Features. In: IEEE Journal of Photovoltaics. 2019 ; Vol. 9, No. 6. pp. 1631-1636.
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abstract = "A recently developed method to characterize the band gap energies of III-V optosemiconductors was utilized to determine temperature-invariant band gap features of multijunction solar cells. The method is based on measuring electroluminescent spectra of the solar cells at different temperatures. The normalized spectra reveal temperature-invariant energy values of the different junctions which are further converted to band gap energies. The method utilization requires a calibrated spectroradiometer and a temperature controlled mounting base for the solar cell under test, however, no knowledge about the absolute temperature of the cell under measurement. The method was tested on GaAs and GaInP solar cells that consist of single and dual junctions. The band gap energies were also derived from spectral response measurements. The differences of the determined band gap energies from the literature values were smaller than 1.1{\%}. Compared with other band gap determination methods, the developed method yields temperature-invariant band gap characteristics; with a known uncertainty, that separated the different junctions in a multijunction device without individual biasing for the different junctions. In addition, a temperature-independent characterization parameter ensures that the operating conditions of the device under test do not affect the results.",
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Optical Characterization of III-V Multijunction Solar Cells for Temperature-Independent Band Gap Features. / Baumgartner, Hans; Oksanen, Benjamin; Karha, Petri; Ikonen, Erkki.

In: IEEE Journal of Photovoltaics, Vol. 9, No. 6, 8827497, 11.2019, p. 1631-1636.

Research output: Contribution to journalArticleScientificpeer-review

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