Effect of excitons in AlGaAs/GaAs superlattice solar cells

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

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The effect of excitonic absorption on solar cell efficiency has been investigated using solar cells with AlGaAs/GaAs superlattice active regions. Numerical calculations reveal that excitonic absorption considerably enhances the overall absorption of bulk GaAs. Excitonic absorption shows strong and sharp peaks at the absorption edge and in the energy region above the band gap. Absorption enhancement is also achieved in the AlGaAs/GaAs superlattice. The measured quantum efficiency spectra of AlGaAs/GaAs solar cells are found to be quite similar to the calculated absorption spectra considering the excitonic effect. The miniband structures of the superlattice and the electric field of the p-i-n junction enhance the dissociation of excitons and the extraction of separated carriers. These results suggest that the enhanced absorption by excitons can increase the quantum efficiency of solar cells.

Original languageEnglish
Article number052302
JournalJapanese Journal of Applied Physics
Volume50
Issue number5 PART 1
DOIs
Publication statusPublished - 2011 May

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Excitons
aluminum gallium arsenides
Solar cells
solar cells
excitons
Quantum efficiency
quantum efficiency
Absorption spectra
Energy gap
p-i-n junctions
Electric fields
dissociation
absorption spectra
electric fields
augmentation

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Nishinaga, J., Kawaharazuka, A., Onomitsu, K., Ploog, K. H., & Horikoshi, Y. (2011). Effect of excitons in AlGaAs/GaAs superlattice solar cells. Japanese Journal of Applied Physics, 50(5 PART 1), [052302]. https://doi.org/10.1143/JJAP.50.052302

Effect of excitons in AlGaAs/GaAs superlattice solar cells. / Nishinaga, Jiro; Kawaharazuka, Atsushi; Onomitsu, Koji; Ploog, Klaus H.; Horikoshi, Yoshiji.

In: Japanese Journal of Applied Physics, Vol. 50, No. 5 PART 1, 052302, 05.2011.

Research output: Contribution to journalArticle

Nishinaga, J, Kawaharazuka, A, Onomitsu, K, Ploog, KH & Horikoshi, Y 2011, 'Effect of excitons in AlGaAs/GaAs superlattice solar cells', Japanese Journal of Applied Physics, vol. 50, no. 5 PART 1, 052302. https://doi.org/10.1143/JJAP.50.052302
Nishinaga J, Kawaharazuka A, Onomitsu K, Ploog KH, Horikoshi Y. Effect of excitons in AlGaAs/GaAs superlattice solar cells. Japanese Journal of Applied Physics. 2011 May;50(5 PART 1). 052302. https://doi.org/10.1143/JJAP.50.052302
Nishinaga, Jiro ; Kawaharazuka, Atsushi ; Onomitsu, Koji ; Ploog, Klaus H. ; Horikoshi, Yoshiji. / Effect of excitons in AlGaAs/GaAs superlattice solar cells. In: Japanese Journal of Applied Physics. 2011 ; Vol. 50, No. 5 PART 1.
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