  The optical and electrical properties of optically-thin one-dimensional (1D)
Ag nanogratings and two-dimensional (2D) Ag nanogrids are studied, and their
use as transparent electrodes in organic photovoltaics are explored. A large
broadband and polarization-insensitive optical absorption enhancement in the
organic light-harvesting layers is theoretically and numerically demonstrated
using either single-layer 2D Ag nanogrids or two perpendicular 1D Ag
nanogratings, and is attributed to the excitation of surface plasmon resonances
and plasmonic cavity modes. Total photon absorption enhancements of 150% and
200% are achieved for the optimized single-layer 2D Ag nanogrids and double
(top and bottom) perpendicular 1D Ag nanogratings, respectively.
