Patent ID: 9005851
Filing Date: 2015-04-14
Classification: G03F

Abstract:
1. A phase shift mask blank, which is an original plate of a phase shift mask exposed to an ArF excimer laser light, wherein: the phase shift mask blank has a light transmissive substrate, a phase shift film and a light-shielding film; the phase shift film is provided between the light transmissive substrate and the light-shielding film; the phase shift amount of the phase shift film with respect to the ArF excimer laser light is 160° to 180° the transmittance of the phase shift film is 2 to 40%; the light-shielding film consist of a plurality of layers; the optical density of the entire light-shielding film is 1.8 to 2.6; the ratio of the optical density of a layer A constituting the plurality of layers to the sum of the optical densities of all the layers other than the layer A is 1:5 to 1:19; each of the layers constituting the light-shielding film contains a metal; and the layers other than the layer A consist of a film comprising: the same metal as that contained in the layer A; N; and O, and the sum of the content of N and the content of O is 40 to 65 atomic %.