Patent ID: 7560222
Filing Date: 2009-07-14
Classification: G03F

Abstract:
1. A method of providing a nano-scale opening within a dielectric material comprising: providing a structure which includes, from bottom to top, a dielectric material having at least one conductive feature embedded therein, an organic underlayer located atop said dielectric material, a hard mask located atop the organic underlayer and a copolymer film located on said hard mask, said copolymer film comprising a first monomer unit (A) that contains a Si-containing component, and a second monomer unit (B) that contains an organic component, wherein said two monomer units (A and B) have different etch rates and said copolymer film has the following structural formula: wherein n is from about 0.3 to about 0.97 and m is from about 0.03 to about 0.7; selectively removing the first monomer unit from said copolymer film by selective etching thereby forming nano-scale openings in said copolymer film, said nano-scale openings are substantially perpendicular with upper and lower surfaces of said copolymer film; and transferring the nano-scale openings from said copolymer film to said dielectric material utilizing a selective etching process.