TRANSPARENT SUBSTRATE COATED WITH A STACK OF THIN LAYERS

A transparent substrate coated with a stack of thin layers includes, from the substrate, a bottom dielectric coating including a wetting layer, which is, for example, a ZnO-based layer, a silver-based functional metal layer and a top dielectric coating, each dielectric coating including several dielectric layers, wherein the bottom dielectric coating includes a series of at least three dielectric layers having increasing refractive indices, the index difference between the three layers being at least 0.15; the top dielectric coating including a series of at least two layers having decreasing refractive indices. The Ug coefficient is kept at low values (from 0.22 to 0.31 Btu/hft2F) whereas the solar factor SHGC is maximized (from 0.720 to 0.757).