Patent ID: 9153440
Filing Date: 2015-10-06
Classification: H01L

Abstract:
1. A method, comprising: forming a first mask pattern over a substrate, at least one portion of the first mask pattern has a first width; forming first spacers adjoining sidewalls of the first mask pattern, the first spacers each having a first spacer width; removing the first mask pattern leaving an opening between the first spacers, the opening having the first width; reducing the first width of the opening left by removing the first mask pattern by forming second spacers adjoining sidewalls of the first spacers, the first spacers each having the first spacer width and the second spacers being formed at least within the opening; forming a filling layer over the substrate and between the second spacers; and removing the first spacers and the second spacers, while leaving the filling layer to form a second mask pattern, wherein at least one portion of the second mask pattern is formed in a position that substantially corresponds with a position of the at least one portion of the first mask pattern, and the at least one portion of the second mask pattern has a second width less than the first width.