Patent ID: 11314162

Abstract:
Provided is a mask blank in which a light shielding film which is a single layer film formed of a silicon nitride-based material has high light shielding performance against ArF exposure light and is capable of reducing EMF bias of a pattern of the light shielding film. The mask blank includes the light shielding film on a transparent substrate. The light shielding film has an optical density of 3.0 or greater to ArF exposure light. A refractive index n and an extinction coefficient k of the light shielding film to ArF exposure light simultaneously satisfy relationships defined by Formulas (1) and (2) below. n≤0.0733×k2+0.4069×k+1.0083  Formula (1)n≥29.316×k2−92.292×k+72.671  Formula (2)