Patent ID: 9269627
Filing Date: 2016-02-23
CPC Classification: H01L

Claim Text:
1. A method of forming a semiconductor structure comprising: forming a set of first mandrel structures on a substrate; removing at least one first mandrel structure from the set of first mandrel structures; forming a set of second mandrel structures over remaining first mandrel structures and portions of the substrate, wherein each second mandrel structure overlaps at least a portion of at least one first mandrel structure of the remaining first mandrel structures and fills at least a portion of at least one space between adjacent first mandrel structures of the remaining first mandrel structures; forming first spacer portions on exposed sidewalls of the remaining first mandrel structures and second spacer portions on exposed sidewalls of the second mandrel structures; removing the remaining first mandrel structures and the second mandrel structures selective to the first spacer portions and second spacer portions; and transferring a pattern of the first spacer portions and the second spacer portions into a portion of the substrate.