Patent ID: 8216747
Filing Date: 2012-07-10
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 a transparent substrate and a phase shift film including, as main components, a metal, silicon (Si) and nitrogen (N) wherein the phase shift film has a refractive index (n) with respect to the wavelength of the ArF excimer laser beam of equal to or greater than 2.3 and an extinction coefficient (k) of equal to or greater than 0.28, wherein the phase shift film has a value (A) of (atomic concentration of the metal)/(atomic concentration of the metal+atomic concentration of silicon (Si)) that is calculated from measurement results based on Auger electron spectroscopy in a range of 0.06 to 0.13, and wherein the content of nitrogen (N) in the phase shift film is equal to or greater than 35 atomic % and equal to or less than 55 atomic %.