Abstract
In this paper we use the finite difference time domain (FDTD) method to show that the efficiency of an organic photovoltaic cell can be significantly improved by nanostructuring the indium tin oxide (ITO) layer with 2D periodic arrays of holes. With air filling of the ITO structure, the number of absorbed photons is increased by 24.8% and the absorptance is increased by 22.1%. This paper also assesses the effect of allowing the adjacent poly(3, 4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) layer to the fill the grating, in which case lower enhancements are found of 7.5% and 8.6% respectively. Finally, low-loss dielectric filling using poly(methyl methacrylate) (PMMA) is assessed, and enhancements of 15% and 16% are found.
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