NOVELTY - The method for producing a thin-film solar cell having a photoactive layer (100), which has an electrode (104) on a front side, where the electrode is optically transparent in the region of visible light, comprises applying an electrically conductive network (110) of conductor tracks on a rear side of the photoactive layer, where the network is optically transparent in the region of visible light that is viewed macroscopically. The conductor tracks contain particles such as silver particles, carbon nanotubes, soot and/or conductive soot. The conductor tracks have a width of 1 mu m to 1 mm.    USE - Method for producing a thin-film solar cell, which is useful for the operation of stationary units during traffic control and air traffic flow management on motorways e.g. automats and as devices which convert light energy into electrical energy using photovoltaic effect.    ADVANTAGE - The method ensures simple, continuous and flexible production of the thin-film solar cell with good electrical conductivity.    DETAILED DESCRIPTION - The method for producing a thin-film solar cell having a photoactive layer (100), which has an electrode (104) on a front side, where the electrode is optically transparent in the region of visible light, comprises applying an electrically conductive network (110) of conductor tracks on a rear side of the photoactive layer, where the network is optically transparent in the region of visible light that is viewed macroscopically. The conductor tracks contain particles such as silver particles, carbon nanotubes, soot and/or conductive soot. The conductor tracks have a width of 1 mu m to 1 mm and a mutual distance of 5 mu m to 1 mm. The application of the network of conductor tracks is carried out by introducing a network of particles on the rear side and heating the network of particles for the formation of the electrically conductive network of conductor tracks, and/or by introducing electrically conductive network of conductor tracks on a surface layer (108) and/or a plastic protective layer (200) that is optically transparent in the region of visible light and by applying the surface layer and/or the plastic protective layer with the network of conductor tracks on the rear side of the photoactive layer. The surface layer and/or the plastic protective layer are a flexible film, where the optically transparent surface layer and/or the plastic protective layer are applied on the rear side of the photoactive layer by rolling. The electrically conductive network of conductor tracks are applied by a screen printing process, ink-jet printing process, aerosol jet printing process, impulse jet printing process, offset printing process, heliogravure process and/or flexography. The network of particles is applied by introducing a dispersion, which comprises particles and liquid that is water, organic solvent and/or liquid plastic. The particles form the conductor tracks in the form of composite material, where the particles have a diameter of 250 nm to 1 mu m. An INDEPENDENT CLAIM is included for a thin-film solar cell having a photoactive layer.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a solar cell.    Photoactive layer (100)    Electrode (104)    Surface layer (108)    Electrically conductive network (110)    Plastic protective layer. (200)