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Optimization of Dielectric-Coated Silver Nanoparticle Films for Plasmonic-Enhanced Light Trapping in Thin Film Silicon Solar Cells

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Abstract

Surface plasmonic-enhanced light trapping from metal nanoparticles is a promising way of increasing the light absorption in the active silicon layer and, therefore, the photocurrent of the silicon solar cells. In this paper, we applied silver nanoparticles on the rear side of polycrystalline silicon thin film solar cell and systematically studied the dielectric environment effect on the absorption and short-circuit current density (Jsc) of the device. Three different dielectric layers, magnesium fluoride (MgF2, n = 1.4), tantalum pentoxide (Ta2O5, n = 2.2), and titanium dioxide (TiO2, n = 2.6), were investigated. Experimentally, we found that higher refractive index dielectric coatings results in a redshift of the main plasmonic extinction peak and higher modes were excited within the spectral region that is of interest in our thin film solar cell application. The optical characterization shows that nanoparticles coated with highest refractive index dielectric TiO2 provides highest absorption enhancement 75.6 %; however, from the external quantum efficiency characterization, highest short-circuit current density Jsc enhancement of 45.8 % was achieved by coating the nanoparticles with lower refractive index MgF2. We also further optimize the thickness of MgF2 and a final 50.2 % Jsc enhancement was achieved with a 210-nm MgF2 coating and a back reflector.

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Acknowledgments

J.Rao acknowledges the receipt of a Vice-Chancellor Research Fellowship at the University of New South Wales.

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Authors and Affiliations

  1. School of Photovoltaics, University of New South Wales, Sydney, 2052, Australia

    Jing Rao, Sergey Varlamov & Jongsung Park

  2. Commonwealth Scientific and Industrial Research Organisation Materials Science and Engineering, Lindfield, PO Box 218, Sydney, NSW, 2070, Australia

    Svetlana Dligatch & Anatoli Chtanov

Authors
  1. Jing Rao
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  2. Sergey Varlamov
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  3. Jongsung Park
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  4. Svetlana Dligatch
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  5. Anatoli Chtanov
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Correspondence to Jing Rao.

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Rao, J., Varlamov, S., Park, J. et al. Optimization of Dielectric-Coated Silver Nanoparticle Films for Plasmonic-Enhanced Light Trapping in Thin Film Silicon Solar Cells. Plasmonics 8, 785–791 (2013). https://doi.org/10.1007/s11468-012-9473-y

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  • DOI: https://doi.org/10.1007/s11468-012-9473-y

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