Method for producing a substrate having a colored interference filter layer, said substrate comprising a colored interference filter layer, the use of said substrate as a colored solar cell or as a colored solar module or as a component thereof

The present invention relates to a method for producing a substrate having a colored interference filter layer, comprising polycrystalline metal oxide or polycrystalline metal oxides, by gas phase deposition, particularly physical or chemical, using a coating system, particularly by means of a sputter gas, wherein at least two, particularly at least six coating layers are deposited from the gas phase, each on top of the other, forming polycrystalline metal oxides having an average thickness of each coating layer in the range of about 50 nm to 250 nm, particularly in the range of about 90 nm to 210 nm, wherein the averaged percentual atomic components of at least one, particularly of each individual metal present in at least two, particularly in all coating layers deviates from the averaged percentual composition of each metal by no more than +/-20 % atoms, preferably by no more than +/-10% atoms, and particularly preferably by no more than +/-5% atoms, wherein 100% atoms is the sum of all metals present in th