Patent ID: 9583381
Date: 2017-02-28
CPC Classifications: G03F,H01L

Claim:
1. A method of forming a semiconductor device, comprising: reacting outer portions of a first patterned photosensitive material with a chemically active species in solution to deprotect the outer portions of the first patterned photosensitive material; forming a first filler material between deprotected outer portions of the first patterned photosensitive material; removing the deprotected outer portions of the first patterned photosensitive material to form first trenches while leaving inner portions of the first patterned photosensitive material; removing portions of a first hardmask and a first mask material exposed through the first trenches to form first openings extending in a first direction in the first mask material; reacting outer portions of a second patterned photosensitive material over a resist material in the first openings with a chemically active species in solution to deprotect the outer portions of the second patterned photosensitive material; forming a second filler material between deprotected outer portions of the second patterned photosensitive material; removing the deprotected outer portions of the second patterned photosensitive material to form second trenches while leaving inner portions of the second patterned photosensitive material; removing portions of the first mask material exposed through the second trenches to form second openings in the first mask material extending in a second direction; and removing portions of a second mask material underlying the first mask material at intersections of the first openings and second openings to form holes in the second mask material and to expose a substrate underlying the second mask material.