Geometrical Light Trapping in Thin c-Si Solar Cells beyond Lambertian Limit

摘要

Incomplete photon absorption is one big drawback in solar cells with thin absorbers. Therefore, the development of advanced light-trapping schemes is one major task to reduce the optical losses. The so-called Lambertian scattering is often used as a benchmark for the application of light-trapping schemes with features that are treated by geometrical optics. In our optical simulation study, we introduce two different deterministic light-trapping approaches. We show that in both cases, the absorptance in 60 μm thin c-Si absorbers exceeds the value for Lambertian scattering in a broad spectral range.