High-Efficiency Nanowire Solar Cells with Omnidirectionally Enhanced Absorption Due to Self-Aligned Indium-Tin-Oxide Mie Scatterers

Dick Van Dam, Niels J.J. Van Hoof, Yingchao Cui, Peter J. Van Veldhoven, Erik P.A.M. Bakkers, Jaime Gómez Rivas, Jos E.M. Haverkort

    Research output: Contribution to journalArticleScientificpeer-review

    99 Citations (Scopus)

    Abstract

    Photovoltaic cells based on arrays of semiconductor nanowires promise efficiencies comparable or even better than their planar counterparts with much less material. One reason for the high efficiencies is their large absorption cross section, but until recently the photocurrent has been limited to less than 70% of the theoretical maximum. Here we enhance the absorption in indium phosphide (InP) nanowire solar cells by employing broadband forward scattering of self-aligned nanoparticles on top of the transparent top contact layer. This results in a nanowire solar cell with a photovoltaic conversion efficiency of 17.8% and a short-circuit current of 29.3 mA/cm2 under 1 sun illumination, which is the highest reported so far for nanowire solar cells and among the highest reported for III-V solar cells. We also measure the angle-dependent photocurrent, using time-reversed Fourier microscopy, and demonstrate a broadband and omnidirectional absorption enhancement for unpolarized light up to 60° with a wavelength average of 12% due to Mie scattering. These results unambiguously demonstrate the potential of semiconductor nanowires as nanostructures for the next generation of photovoltaic devices.

    Original languageEnglish
    Pages (from-to)11414-11419
    Number of pages6
    JournalACS Nano (online)
    Volume10
    Issue number12
    DOIs
    Publication statusPublished - 2016

    Keywords

    • absorption
    • efficiency
    • InP
    • Mie scattering
    • nanowires
    • photovoltaics
    • solar cells

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