TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The quantum dots, quantum well or inorganic semiconducting nanoparticle is from functionalized or non-functionalized cadmium sulfide, cadmium telluride, titanium dioxide, copper indium sulfide, copper indium sulfide/copper(indium, gallium)selenide or copper (indium, gallium)sulfide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The derivitazation degree of (I) is 1-3, which over a cyclopropane ring in (5,6)- or (6,6)-position are bonded to the fullerene molecule with a functionality of 1-3, where the monoderivatized, two or three times derivatized (I) are isolated or used in the mixture. (I) is used as electron transporting and/or hole blocking layer. Preferred Components: The electron donor and (I) in the photoactive layer exist as a mixture or separate overlapping layers, subdivided in one or more p-conducting layers containing the electron donor, and subdivided in one or more n-conducing layers containing (I). The photoactive layer is obtained by the separation of a separate layer containing at least one of the electron donor material on a substrate and separation of further separate layer containing (I) on the substrate. The mass to mass ratio of (I) to p-conducting material in the photoactive layer is 10:1-1:10.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The electron donor is a conjugated polymer, conjugated oligomer, conjugated molecule, which is free of repetition units, quantum dots, quantum well or an inorganic semiconducting nanoparticle. The electron donor is preferably conjugated polymer or conjugated oligomer of optionally substituted thiophene, phenylene vinylene, phenylenethinylene, phenylene, fluorene, acetylene, isothianaphthene, benzothiadiazole, pyrrole, triarylamine, thienopyrazine, polymethine, cyanine, polyene and/or polyaniline. The conjugated molecule is free of repetition units from a metal free or metal containing phthalocyanine, a metal free or metal containing porphyrin, optionally substituted coronene, rubrene, pentacene or perylene.