Patent ID: 7935461
Filing Date: 2011-05-03
Classification: G03F

Abstract:
1. A phase shift mask blank that is an original plate for a phase shift mask that is used with a semiconductor design rule of 32 nm node and beyond and exposed by an ArF excimer laser beam, comprising on a transparent substrate: a phase shift film including, as main components, a metal, silicon (Si) and nitrogen (N), having optical characteristics of a transmittance of equal to or greater than 9% and equal to or less than 30% with respect to a wavelength of the ArF excimer laser beam and a phase difference of equal to or greater than 150° and less than 180°; and a light-shielding film formed on the phase shift film, wherein a thickness of the phase shift film is equal to or less than 80 nm, and a refractive index (n) with respect to the wavelength of the ArF excimer laser beam is equal to or greater than 2.3, and an extinction coefficient (k) is equal to or greater than 0.28.