Patent ID: 7972926
Filing Date: 2011-07-05
Classification: H01L

Abstract:
1. A method of forming and using a set of substantially vertical structures, comprising: photolithographically forming a plurality of substantially identical spaced-apart photoresist features over a substrate; the spaced-apart photoresist features being in a line, and being of substantially uniform lateral width as one another; while forming the spaced-apart photoresist features, photolithographically forming a placeholder over the substrate at an end of said line; the placeholder being spaced from the end of the line of spaced-apart photoresist features by a gap, and having a lateral width that is no more than three-times the substantially uniform width of the spaced-apart photoresist features; forming a layer over and between the spaced-apart photoresist features, over the placeholder, and within the gap between the placeholder and the end of the line of spaced apart photoresist features; anisotropically etching the layer into a plurality of first vertical structures along the edges of the spaced-apart photoresist features, and into a second vertical structure along an edge of the placeholder; covering the second vertical structure with a mask while leaving the first vertical structures uncovered; and etching into the substrate while using the mask and the first vertical structures to define a pattern that is to be transferred into the substrate.