Optical properties of Al<inf>x</inf>Ga<inf>1-x</inf>As/GaAs superlattice solar cells

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

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    The effect of excitons in Al<inf>x</inf>Ga<inf>1-x</inf>As/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 Al<inf>0.5</inf>Ga<inf>0.5</inf>As/GaAs superlattice solar cell with 2-μm-thick active layer.

    Original languageEnglish
    Pages (from-to)333-336
    Number of pages4
    JournalJournal of Crystal Growth
    Volume425
    DOIs
    Publication statusPublished - 2015 Jul 28

    Fingerprint

    Solar cells
    Optical properties
    solar cells
    optical properties
    photoabsorption
    Quantum efficiency
    Excitons
    quantum efficiency
    excitons
    barrier layers
    Band structure
    gallium arsenide
    room temperature
    Temperature
    LDS 751

    Keywords

    • A3. Molecular beam epitaxy
    • A3. Superlattices
    • B2. Semiconducting gallium arsenide
    • B3. Solar cells

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Materials Chemistry
    • Inorganic Chemistry

    Cite this

    Optical properties of Al<inf>x</inf>Ga<inf>1-x</inf>As/GaAs superlattice solar cells. / Kuramoto, Makoto; Urabe, Hiroyuki; Nakano, Tomohiro; Kawaharazuka, Atsushi; Nishinaga, Jiro; Makimoto, Toshiki; Horikoshi, Yoshiji.

    In: Journal of Crystal Growth, Vol. 425, 28.07.2015, p. 333-336.

    Research output: Contribution to journalArticle

    Kuramoto, M, Urabe, H, Nakano, T, Kawaharazuka, A, Nishinaga, J, Makimoto, T & Horikoshi, Y 2015, 'Optical properties of Al<inf>x</inf>Ga<inf>1-x</inf>As/GaAs superlattice solar cells', Journal of Crystal Growth, vol. 425, pp. 333-336. https://doi.org/10.1016/j.jcrysgro.2015.03.024
    Kuramoto, Makoto ; Urabe, Hiroyuki ; Nakano, Tomohiro ; Kawaharazuka, Atsushi ; Nishinaga, Jiro ; Makimoto, Toshiki ; Horikoshi, Yoshiji. / Optical properties of Al<inf>x</inf>Ga<inf>1-x</inf>As/GaAs superlattice solar cells. In: Journal of Crystal Growth. 2015 ; Vol. 425. pp. 333-336.
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    AU - Urabe, Hiroyuki

    AU - Nakano, Tomohiro

    AU - Kawaharazuka, Atsushi

    AU - Nishinaga, Jiro

    AU - Makimoto, Toshiki

    AU - Horikoshi, Yoshiji

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