We demonstrate effective mode coupling by light scattering from periodic Ag nanoparticle arrays printed onto a completed thin-film a-Si:H solar cell. Current-voltage measurements show a photocurrent enhancement of 10% compared to a flat reference cell with a standard antireflection coating. External quantum efficiency measurements for the nanopatterned cells show clear infrared photocurrent enhancement peaks, corresponding to coupling to discrete waveguide modes in the a-Si:H layer. The data are in good agreement with three-dimensional finite element simulations, which are used to further optimize the design. We show that broadband photocurrent enhancement can be obtained over the 450–750 nm spectral range.

AIP
dx.doi.org/10.1063/1.4767997
Appl. Phys. Lett.
LMPV
Photonic Materials

van Lare, M.C, Lenzmann, F.O, Verschuuren, M.A, & Polman, A. (2012). Mode coupling by plasmonic surface scatterers in thin-film silicon solar cells. Appl. Phys. Lett., 101(22, Article number: 221110), 1–4. doi:10.1063/1.4767997