Patent ID: 7470606

Claim:
A masking method comprising: forming a masking material comprising boron doped amorphous carbon over a feature formed on a semiconductor substrate, the masking material comprising at least about 0.5 atomic percent boron; substantially anisotropically etching the masking material effective to form an anisotropically etched sidewall spacer comprising the boron doped amorphous carbon on a sidewall of the feature, the boron doped amorphous carbon-comprising spacer having an elevational thickness; using the boron doped amorphous carbon-comprising spacer as a mask while selectively depositing material on the substrate proximate the spacer, the material being deposited to an elevational thickness which is less than the elevational thickness of the boron doped amorphous carbon-comprising spacer; and after said selectively depositing, etching the boron doped amorphous carbon-comprising spacer from the substrate.