Patent ID: 9075320
Filing Date: 2015-07-07
Classification: G03F,Y10T

Abstract:
1. A mask blank adapted to manufacture a transfer mask applied with ArF excimer laser exposure light, comprising: a transparent substrate; and a light-shielding film formed on the transparent substrate, the light-shielding film serving to form a transfer pattern; wherein the light-shielding film has an at least two-layer structure comprising a lower layer and an upper layer from a side of the transparent substrate, the lower layer contains a transition metal, silicon, and nitrogen and is made of a material having a refractive index n of 1.9 or less and an extinction coefficient k of 2.2 or more, the upper layer contains a transition metal, silicon, and nitrogen and is made of a material having a refractive index n of 2.1 or less an extinction coefficient k of 1.6 or less, and a difference between a ratio obtained by dividing a content of the transition metal in the lower layer by a total content of the transition metal and the silicon in the lower layer and a ratio obtained by dividing a content of the transition metal in the upper layer by a total content of the transition metal and the silicon in the upper layer is 4% or less.