This solar cell consists of the following layers from front to back: SiO2, SnO2, a thin AZO layer, an amorphous Si absorptive core, AZO, and a silver reflector. Many of the material interfaces are defined to be randomly textured as can be seen in Fig. 1. This is accomplished through the use of width tapers and overlapping segments in the CAD. The structure is assumed to be periodic outside the simulation domain marked in the figure, resulting in a locally random structure that is periodic on a larger scale. Only the absorption within the irregularly-shaped amorphous Si region contributes to the cell efficiency.
The launch field is a plane wave with a TE polarization that is incident along the positive X axis (left to right in Fig. 1).