Metal/Polymer Back Reflectors with Diffraction Gratings for Light Trapping in III-V Solar Cells

Timo Aho, Mircea Guina, Farid Elsehrawy, Federica Cappelluti, Marianna Raappana, Antti Tukiainen, A. B. M. Khairul Alam, Ismo Vartiainen, Markku Kuittinen, Tapio Niemi

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

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    Abstract

    We report on the fabrication, characterization and simulation of diffraction gratings for back contact reflectors in III-V solar cells. The gratings are designed for thin-film solar cells incorporating absorbers with bandgap slightly lower than GaAs, such as InAs/GaAs quantum dot or GaInNAs solar cells. Metal/polymer back reflectors with a blazed grating or a pyramid grating were fabricated by nanoimprint lithography. The gratings are compared in terms of diffraction ability, which is the feature responsible for increasing the absorption. The pyramid grating showed higher diffraction of light compared to the blazed grating. The diffraction efficiency measurements were in agreement with the numerical simulations. The model validation enables tailoring the properties of the reflectors for other type of solar cells by adjusting the optimal dimensions of the gratings for different wavelengths.
    Original languageEnglish
    Title of host publication2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC)
    Subtitle of host publicationA Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC
    PublisherIEEE
    Pages2847-2851
    Number of pages5
    ISBN (Electronic)978-1-5386-8529-7
    DOIs
    Publication statusPublished - Nov 2018
    Publication typeA4 Article in conference proceedings
    EventWorld Conference on Photovoltaic Energy Conversion -
    Duration: 5 Dec 1994 → …

    Publication series

    NameCONFERENCE RECORD OF THE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE
    PublisherIEEE
    ISSN (Print)0160-8371

    Conference

    ConferenceWorld Conference on Photovoltaic Energy Conversion
    Period5/12/94 → …

    Publication forum classification

    • Publication forum level 1

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics

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