Patent ID: 8906807
Filing Date: 2014-12-09
Classification: H01L

Abstract:
1. A method of forming a semiconductor structure comprising: forming mandrel structures over a stack of a semiconductor layer and a dielectric layer; forming fin-defining spacers on sidewalls of said mandrel structures; forming mask material portions on first fin-defining spacer portions located on a first-side sidewall of each mandrel structure by a directional deposition of a mask material, wherein said mandrel structures shield second fin-defining spacer portions located on a second-side sidewall of each mandrel structure from said mask material during said directional deposition; forming a patterned mask layer including at least one opening therein over said mandrel structures, fin-defining spacers, and said mask material portions; and removing portions of said fin-defining spacers located within said at least one opening and not covered by said mask material portions in an anisotropic etch, while a subset of said mask material portions within said at least one opening protects underlying portions of said fin-defining spacers during said anisotropic etch.