Light trapping with titanium dioxide diffraction gratings fabricated by nanoimprinting

Er Chien Wang*, Sudha Mokkapati, Tom P. White, Thomas Soderstrom, Sergey Varlamov, Kylie R. Catchpole

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)

    Abstract

    Dielectric scattering structures are a promising way of trapping light in solar cells. Titanium dioxide is a particularly attractive candidate material because of its high refractive index and ability to be deposited on a finished solar cell. Here, we present an experimental demonstration of photocurrent enhancement in thin film recrystallised silicon solar cells using TiO2 pillar arrays fabricated on the rear of the cells using nanoimprint lithography. A short circuit current enhancement of 19% is measured experimentally, and excellent agreement with numerical simulations is obtained. We show numerically that by replacing the Ag capping present on the cells with a detached rear Ag back reflector, the enhancement could reach 37%.

    Original languageEnglish
    Pages (from-to)587-592
    Number of pages6
    JournalProgress in Photovoltaics: Research and Applications
    Volume22
    Issue number5
    DOIs
    Publication statusPublished - 1 May 2014

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