Patent ID: 8101481

Claim:
A method comprising: providing a substrate; and forming at least one negative feature in the substrate utilizing a negative spacer lithography process, wherein forming the at least one negative feature comprises: forming a first sacrificial structure on top of the substrate; depositing a first spacer material on top of the first sacrificial structure and a portion of the substrate exposed after formation of the first sacrificial structure; anisotropically etching the first spacer material to form at least one spacer adjacent to a side-wall of the first sacrificial structure; depositing a first sacrificial layer on top of the first sacrificial structure, the at least one spacer, and a portion of the substrate exposed after formation of the first sacrificial structure and the at least one spacer; thinning the first sacrificial layer to expose the at least one spacer; removing the at least one spacer; and etching the substrate using the first sacrificial structure and the first sacrificial layer remaining after removing the at least one spacer as a mask to provide the at least one negative feature.