Abstract
The effect of enclosing a nanowire (NW) radial pn junction photovoltaic (PV) element inside a nanoring optical antenna to enhance the electric field in the near field region has been investigated. Five different materials for the NW (Si, Ge, GaAs, GaInP and InGaAs) have been selected to maximize the absorbed solar spectrum. In addition, the position and diameter of the NW are varied through a random distribution to optimize the power conversion efficiency. Results show that the ring antenna geometry and the NW random spatial distribution are effective in both spectral widening and field concentration which result in an increase of the cell conversion efficiency.
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