Patent ID: 6743553
Filing Date: 2004-06-01
Classification: G03F

Abstract:
A halftone phase shift mask blank for use in manufacturing a halftone phase shift mask which has a transmission portion for transmitting an exposure light, and a phase shifter portion for transmitting a part of the exposure light and for shifting a phase of the transmitted light by a predetermined amount on a transparent substrate, the halftone phase shift mask having an optical property that is designed so as to mutually cancel out the respective transmitted lights in the vicinity of a boundary portion of said transmission portion and the phase shifter portion to thereby keep a contrast of a boundary portion of an exposure pattern transferred onto the surface of a material to be exposed, said blank having a phase shifter film for forming said phase shifter portion on the transparent substrate,wherein said phase shift mask is used in an exposure light wavelength range of 140 nm to 200 nm, said phase shifter film is constituted of a film containing main elements of silicon, oxygen, and nitrogen, and contains 35 to 45% of silicon, 1 to 60% of oxygen, and 5 to 60% of nitrogen in atomic percentage, and a total amount of these elements is not smaller than 90% in a whole composition constituting said phase shifter film.