Patent ID: 8637406
Filing Date: 2014-01-28
Classification: H01L,Y10T

Abstract:
1. A method of patterning a structure comprising: forming an underlying material layer on a substrate; forming a stack of two mask layers comprising a dielectric material and a metallic material, respectively, over said underlying material layer; forming a first pattern in one of said two mask layers, wherein a patterned mask layer including said first pattern is formed by remaining portions of said one of said two mask layers, while another of said two mask layers remains unpatterned; forming an overlying structure including a second pattern over said patterned mask layer, wherein said second pattern includes at least one blocking area; removing portions of said patterned mask layer that do not underlie said blocking area, wherein remaining portions of said patterned mask layer include a composite pattern that is an intersection of said first pattern and said second pattern; applying a photoresist material directly on surfaces of said patterned mask layer and on surfaces of said another of said two mask layers that remains unpatterned; patterning said photoresist material to form at least one photoresist block portion having an additional pattern directly on a topmost surface of said another of said two mask layers; transferring a derived pattern including said composite pattern and a pattern of said at least one photoresist block portion as component patterns into said another of said two mask layers; and transferring said derived pattern into said underlying material layer employing remaining portions of said another of said two mask layers as an etch mask.