Geometrically optical analysis of surface anti-reflection V-grooves for solar cells

This paper discusses the V-grooved surface texturing in terms of geometrical optics and uses Fresnel´s formula to calculate the reflectivity. We count all possible reflections of light paths for different angles of incidence as well as structure´s various tilt angles before summing them up together in order to obtain the total reflectivity. We discuss two different light path conditions as follows: 1) the path of light incidence falls perpendicularly onto the edges of the V grooves; 2) the path of light incidence in terms of its horizontal component when it approaches parallel with the edges of V grooves. We use TracePro simulation software in order to verify our analysis. The results from both methods are compatible, enabling us to conclude that light path´s geometrical behavior correspond with our analysis of the V-grooved surface. For oblique incident light, V-grooved surface is proved to be effective in reducing the reflectivity for large angles of incidences.