Excitonic absorption on AlGaAs/GaAs superlattice solar cells

Jiro Nishinaga*, Atsushi Kawaharazuka, Koji Onomitsu, Klaus H. Ploog, Yoshiji Horikoshi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The absorption characteristics of the solar cells with AlGaAs/GaAs superlattice active regions are investigated by external quantum efficiency measurements. The quantum efficiency spectra of the solar cells are well explained by the numerical analysis taking into account the excitonic effect on the photo-absorption. Excitonic absorption shows a strong and sharp peak at the absorption edge, and the excitonic effect also enhances the absorption in the energy region above the bandgap. The experimental quantum efficiencies well correspond to the calculated absorption spectra, and these results clearly indicate that the absorption is increased by excitons even at room temperature.

Original languageEnglish
Pages (from-to)330-333
Number of pages4
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Issue number2
Publication statusPublished - 2012 Feb


  • Excitonic absorption
  • GaAs
  • Solar cell
  • Superlattice

ASJC Scopus subject areas

  • Condensed Matter Physics


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