|The efficiency of a photovoltaic cell is enhanced by light trapping using
Mie-scattering nanostructures. In one embodiment, an array of
nanocylinders is formed on the front surface of a silicon film to enhance
forward scattering into the film, and an array of nanocylinders is formed
on the back surface to enhance backscattering so that more light is
absorbed within the silicon film. In an alternate embodiment, a mirror
layer is formed on the back surface of the silicon film to reflect light
within the film back toward the front-surface nanocylinder array.