Patent ID: 6017659
Filing Date: 2000-01-25
Classification: G03F

Abstract:
A phase shifting photomask fabrication method comprising the steps of:forming opaque patterns on a substrate;forming a first protection layer pattern covering portions of the opaque patterns and the substrate;etching the substrate to form a recessed transmissive portion using the opaque patterns and the first protection layer pattern as a mask;forming a second protection layer over the transmissive portion, the opaque patterns and the first protection layer pattern;removing a portion of the second protection layer to expose the first protection layer pattern;removing the first protection layer pattern to expose the opaque patterns and the substrate;growing an aluminum pattern using the opaque patterns as a seed;etching the substrate;anisotropically etching the aluminum pattern to expose an exposed portion of the substrate; andre-etching the exposed portion of the substrate to form a phase transition region and a phase shifting region.