Impact of the refractive index on coupling structures for silicon solar cells

Structured surfaces are used to reduce reflection and enhance light-trapping in silicon solar cells. In this simulation study, we investigated the relationship between refractive index of front-side coupling structures on top planar wafer-based crystalline cells performance structures. A crossed diffraction grating with a period 1 μm random pyramid varying indices were considered. Simulations carried out both at cell level complete module stack level. It is shown that single pass light path enhancement factor (LPEF) only provides rough estimate properties. The behavior can be reliably assessed system these results deviate from estimated LPEF. also structure strongly influences behavior.