High-absorption-efficiency superlattice solar cells by excitons

Jiro Nishinaga, Atsushi Kawaharazuka, Koji Onomitsu, Yoshiji Horikoshi

研究成果: Article査読

3 被引用数 (Scopus)


The effect of excitonic absorption on solar cell efficiency has been investigated using solar cells with AlGaAs/GaAs superlattice structures. 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 the superlattice solar cells are quite similar to the calculated absorption spectra considering the excitonic effect. The superlattice solar cells are confirmed to have high absorption coefficient compared with the GaAs and AlGaAs bulk solar cells. These results suggest that the enhanced absorption by excitons can increase the quantum efficiency of solar cells. This effect is more prominent for the solar cells with small absorption layer thicknesses.

ジャーナルJapanese Journal of Applied Physics
11 PART 1
出版ステータスPublished - 2013 11月

ASJC Scopus subject areas

  • 工学(全般)
  • 物理学および天文学(全般)


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