Patent ID: 8367226

Claim:
Annealable layer system comprising a transparent substrate, and a first layer sequence which is applied to the substrate directly or to one or more bottom layers which are deposited on the substrate, wherein the layer sequence comprises a substrate-proximal blocking layer comprising NiCrOx, a first selective layer, and a substrate-distal blocking layer comprising NiCrOx, and a first dielectric intermediate layer of ZnAlOx is disposed between the substrate-proximal blocking layer and the first selective layer, and the first dielectric intermediate layer comprises a gradient layer with a gradient that passes from a stoichiometric part of ZnAlO to a substoichiometric part of ZnAlOx, and where the gradient points in a direction of the first selective layer, such that the substoichiometric part of the gradient layer lies on a side of the first selective layer.