Goetzberger, AdolfAdolfGoetzberger2022-03-082022-03-081994https://publica.fraunhofer.de/handle/publica/303075The invention relates to a solar module having a transparent cover under which is located a solar cell. To achieve better efficiency, the invention proposes to provide the outer surface of the cover with grooves having a prismatic cross-section, and the reflection from the surface of the cover is reduced by the suitable selection of the crown angle of the grooves.de608621697patent1990-4023958