Patent ID: 8237050

Claim:
A solar cell having at least one photovoltaic layer made of an organic material which absorbs light and in which electron-hole pairs can be produced, said at least one photovoltaic layer having two opposite layer surfaces of which one is connected with at least one hole-receiving layer for receiving holes produced inside said photovoltaic layer and the other is connected with at least one electron-receiving layer for receiving electrons produced inside said photovoltaic layer, said photovoltaic layer made from a material that differs from the at least one hole-receiving layer and from the at least one electron receiving layer, as well as having electrode areas, of which one said electrode area is electrically connected to said at least one hole-receiving layer and the other said electrode area is electrically connected to said at least one electron receiving layer, wherein said at least one electron-receiving layer is connected via an electrode area to a flat substrate having a front side and a rear side, said flat substrate is provided with opening structures projecting from said front side through the substrate to said rear side, said at least one hole-receiving layer, said photovoltaic layer, said electron-receiving layer and said electrode area connected to said at least one electron receiving layer are applied on said front side of said flat substrate in such a manner that at least one of said opening structures project laterally through said substrate and through said electrode area, the at least one electron-receiving layer, the photovoltaic layer, and the at least one hole-receiving layer, an electrically conducting p ++ layer is applied onto said at least one hole-receiving layer or said at lest one hole-receiving layer is designed as a p ++ layer, which at least partially fills said at least one opening structure and extends through said at least one opening structure, and extends through said flat substrate to said rear side of said flat substrate, and said electrode area for receiving said at least one hole-receiving layer is provided on said rear side of said flat substrate, said electrode area being electrically contacted to said p ++ layer reaching through said at least one opening structure.