Optical properties of AlxGa1-xAs/GaAs superlattice solar cells

Makoto Kuramoto*, Hiroyuki Urabe, Tomohiro Nakano, Atsushi Kawaharazuka, Jiro Nishinaga, Toshiki Makimoto, Yoshiji Horikoshi


研究成果: Article査読

1 被引用数 (Scopus)


The effect of excitons in AlxGa1-xAs/GaAs superlattice solar cells has been investigated. We have shown that the superlattice active layers are effective to improve the solar cell performances because of the exciton enhanced photo-absorption. External quantum efficiency spectra show sharp and intense increase at the absorption edge due to excitonic absorption. This result indicates that excitonic photo-absorption can be stabilized at room temperature by using a superlattice structure. Optical properties of superlattice solar cells depend on the superlattice parameters because they determine the excitonic confinement effect, the tunneling effect and the sub-band structure. In this study, we compare external quantum efficiency for solar cells with different superlattice parameters to optimize the structure. The optimal barrier layer thickness is determined to be 1 nm for the Al0.5Ga0.5As/GaAs superlattice solar cell with 2-μm-thick active layer.

ジャーナルJournal of Crystal Growth
出版ステータスPublished - 2015 7月 28

ASJC Scopus subject areas

  • 凝縮系物理学
  • 無機化学
  • 材料化学


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