  We propose a frequency selective light trapping scheme that enables the
creation of more visually-transparent and yet simultaneously more efficient
semitransparent solar cells. A nanoparticle scattering layer and photonic stack
back reflector create a selective trapping effect by total internal reflection
within a medium, increasing absorption of IR light. We propose a strong
frequency selective scattering layer using spherical TiO2 nanoparticles with
radius of 255 nm and area density of 1.1% in a medium with index of refraction
of 1.5. Using detailed numerical simulations for this configuration, we find
that it is possible to create a semitransparent silicon solar cell that has a
Shockley Queisser efficiency of 12.0%\pm0.4% with a visible transparency of
60.2%\pm1.3%, 13.3%\pm1.3 more visibly-transparent than a bare silicon cell at
the same efficiency.
