Coupling of light into mechanically textured silicon solar cells: A ray tracing study

摘要

AbstractLight coupling into mechanically textured, encapsulated silicon solar cells is studied by three‐dimensional comprehensive ray tracing with our newly developed programme SUNRAYS. We analyse periodic textures with symmetric and non‐symmetric pyramids and grooves. the facet angles of the textures are varied systematically. the study considers the apparent daily motion of the sun and diffuse illumination. SUNRAYS accounts for the dependence of reflection and transmission on the wavelength, the angle of incidence and the polarization of light. As a result of basic interest, we show that the maximum average path length theoretically possible under isotropic illumination is actually achieved by numerous trapping schemes. As a result of practical interest, we demonstrate the outstanding performance of the simple prism groove texture, which yields a large current density while preserving a small surface when compared to all other textures investiga