Dataset for Nanowire solar cell above the radiative limit

A lossless
solar cell operating at the Shockley-Queisser limit generates an open circuit
voltage (Voc) equal to the radiative limit. At Voc, the highly
directional beam of photons from the sun is absorbed and subsequently externally
re-emitted into a 4π solid angle, providing a large photon entropy loss. A
solar cell can beat the Shockley-Queisser limit and approach the 46.7% ultimate
limit by decreasing the output solid angle of the light emission at open
circuit conditions. Here, we present a
design for an InP single nanowire solar cell capable to operate 159 mV above
the radiative limit. We first optimize the spontaneous emission factor (b-factor in the dataset) into a
guided mode of the nanowire towards 68%. We subsequently launch a guided mode at
the bottom straight part of the tapered nanowire yielding a photon escape
probability of 81% for a tapering angle of θ=1.2 degrees

and a top facet with a radius of 83 nm (transmission part of the dataset). When
assuming homogeneous light emission along the nanowire, an outcoupling
efficiency of 42% of the emitted light is obtained. The final optimization is
the reduction of the emission cone towards 0.011 sr by focusing the guided mode with an
external lens (lens part of the dataset).