Heat-treated material having low resistivity and improved mechanical properties

A material comprising a transparent substrate coated with a stack of thin layers comprising at least one silver-based functional metallic layer and at least two dielectric coatings, each dielectric coating including at least one dielectric layer, so that each silver-based functional metallic layer is disposed between two dielectric coatings,

• wherein the stack comprises:
• a zinc-based metallic layer, located above or below a silver-based functional metallic layer, the zinc-based metallic layer comprising at least 20% by weight of zinc relative to the weight of the zinc-based metallic layer,
• a nickel oxide-based layer located below the silver-based functional metallic layer and being separated from the silver-based functional metallic layer by at least one crystallized dielectric layer, wherein the nickel oxide-based layer comprises at least 1% by weight of one or more metallic elements other than nickel relative to the total weight of all the elements constituting the nickel oxide-based layer excluding oxygen and nitrogen, and
• a zinc oxide-based crystallized dielectric layer located below and in contact with the nickel oxide-based layer.