Patent ID: 7833629

Claim:
A transparent glass substrate comprising a material having a surface coated with an antireflective coating, wherein the antireflective coating can undergo heat treatment, and wherein the antireflective coating comprises: (i) a high-index first layer comprising zinc-tin mixed oxide, having a first refractive index, n 1 , of between 1.8 and 2.3 and a first geometrical thickness, e 1 , of between 5 and 50 nm; (ii) a low-index second layer comprising SiO 2 , having a second refractive index, n 2 , of between 1.30 and 1.70 and a second geometrical thickness, e 2 , of between 5 and 50 nm; (iii) a high-index third layer comprising zinc-tin mixed oxide, having a third refractive index, n 3 , of between 1.8 and 2.3 and a third geometrical thickness, e 3 , of at least 120 nm; (iv) a low-index fourth layer comprising SiO 2 , having a fourth refractive index, n 4 , of between 1.30 and 1.70 and a fourth geometrical thickness, e 4 , of at least 90 nm.