Patent ID: 6686102
Filing Date: 2004-02-03
Classification: G03F

Abstract:
A set of photomasks for photolithographic patterning of a layer of an integrated circuit, comprising:a binary photomask having at least two spaced apart opaque regions at a surface thereof defining a first aperture therebetween; a phase shift photomask having an opaque film at a surface thereof in which a plurality of apertures are formed, the plurality of apertures including first and second phase shift apertures separated from one another on the photomask by a first opaque region of the opaque film, the first and second phase shift apertures constructed to transmit electromagnetic energy therethrough at substantially opposite phases relative to one another, the plurality of apertures also including a third aperture in the opaque film separated from the first and second phase shift apertures and positioned to overlap a portion of said first aperture of said binary photomask.