High Efficiency InP Solar Cells Through Nanostructuring

We describe high efficiency InP solar cells which utilize a periodic array of optically designed TiO$_{\mathrm{2}}$ nanocylinders. Optical and electronic simulations were performed to determine the spectrally resolved reflectivity and I-V characteristics of potential devices under AM1.5G illumination. The reflectivity of InP solar cells with these nanocylinders is found to have an average value of 2{\%} over the visible and near-IR spectral range, which outperforms traditional antireflection coatings. Coupling between Mie scattering resonances and thin film interference effects is found to accurately describe the optical enhancement provided by the nanocylinders. These nanostructured solar cells have power conversion efficiencies greater than 23{\%}, which is comparable to the highest quoted efficiencies for InP solar cells.