Patent ID: 8647981
Filing Date: 2014-02-11
Classification: H01L

Abstract:
1. A method of forming a pattern, comprising: forming a series of first lines over a first material, the first material being over an underlying material selected from the group consisting of silicon nitride, metals, metal comprising compositions and conductively doped semiconductor materials; forming a series of second lines over the first lines; the first and second lines forming a crosshatch pattern over the first material; regions of the first material being exposed within first openings in the crosshatch pattern; extending the first openings through the first material; removing portions of the first lines that are not covered by the second lines to pattern the first lines into segments; removing the second lines to uncover the segments; forming masking material between the segments, the masking material filling the first openings; removing the segments to form second openings extending through the masking material to the first material; extending the second openings through the first material; and removing the masking material to leave a patterned mask comprising the first material having the first and second openings therein.