Patent ID: 7767099

Claim:
A method of forming patterned features in a semiconductor device structure, comprising the steps of: (a) forming a patterned mask layer over a surface of the semiconductor device structure, wherein said patterned mask layer comprises a plurality of mask openings; (b) applying a layer of a block copolymer over the patterned mask layer and in the plurality of mask openings, said block copolymer comprising first and second polymeric block components that are immiscible with each other; (c) annealing the block copolymer layer to form a polymer block pattern inside said plurality of mask openings, and wherein the polymer block pattern comprises the second polymeric block component embedded in a polymeric matrix that comprises the first polymeric block component; (d) selectively removing the block copolymer layer from at least one of the plurality of mask openings, while keeping the block copolymer layer inside at least another of the plurality of mask openings; (e) selectively removing the second polymeric block component from the first polymeric block component to form an opening in the polymeric matrix inside said at least another of the plurality of mask openings where the block copolymer layer is kept; and (f) patterning the semiconductor device structure using the opening of the copolymer and the plurality of mask openings.