NOVELTY - The photoactive component with organic layers having a tandem or multi-cell, comprises an electrode, a counter-electrode, and a cavity layer system, which is arranged within a solar cell or between the two adjacent solar cells that change the optical field distribution within the component. The cavity layer system is wavelength-dependent system. The cavity layer system is partially transparent or is transparent for light of a specific polarization, where the layer system partially reflects the light of another polarization. The cavity layer system is present on part of the surface component.    USE - Photoactive component useful as a flat, curved or flexible carrier surface (claimed).    ADVANTAGE - The photoactive component can be economically produced with improved flexibility.    DETAILED DESCRIPTION - The photoactive component with organic layers having a tandem or multi-cell, comprises an electrode, a counter-electrode, and a cavity layer system, which is arranged within a solar cell or between the two adjacent solar cells that change the optical field distribution within the component. The cavity layer system is wavelength-dependent system. The cavity layer system is partially transparent or is transparent for light of a specific polarization, where the layer system partially reflects the light of another polarization. The cavity layer system is present on a part of the surface component and is a metal layer system. The cavity layer system is separated from the photoactive layer system through a transport layer. The cavity layer system is directly contact with the photoactive layer system or completely or partially within a photoactive layer system. The cavity layer system is arranged between all solar cells of the component and differs only through the thickness of the related materials. The two or more cavity layer systems partially consist of different materials or all cavity layer systems consist of pairs of different materials. The cavity layer systems consist of a material or a combination of two or more materials from a metal, a doped, partially doped or undoped metal oxide layer system, a doped, partially doped or undoped organic layer system, a doped, partially doped or undoped chiral organic layer system, a doped, partially doped or undoped fluorescent layer system or a doped, partially doped or undoped layer system of graphite, carbon, nanotube, graphene and metamaterial. An organic or inorganic insulator material is arranged on the surface of the cavity layer system, where the insulator material is transparently arranged. The cavity layer system has a structure of a mesh, rods, strips, circles, triangles, polygons, square shape surface, bananas and/or other geometric structures. The cavity layer system is made of material or a material system with a high dielectric constant or a metamaterial. The component contains one or two transparent or partially transparent electrodes or the component is semitransparent. The component is a pin-tandem cell or a pin-multicell. The component has a structuring.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of an altered intensity distribution of a solar spectrum within a component.