Patent ID: 8568604

Claim:
A method of fabricating at least one sublithographic structure comprising the steps of: depositing a structure layer on a substrate; depositing a layer of a mandrel material over said structure layer in which said layer of mandrel material comprises a polymer of silane; depositing a layer of a cap material over said layer of mandrel material in which said layer of cap material comprises an amorphous silicon; depositing a layer of photoresist material; exposing and developing the photoresist material to form a resist plug; etching said layer of mandrel material and said layer of cap material using the resist plug as a pattern to form at least one sacrificial mandrel; converting at least one sub-lithographic edge region of said sacrificial mandrel to at least one etch-resistant sidewall in which converting comprises oxidizing at a nominal temperature of 20-100° C.; stripping unconverted portions of said layer of mandrel material and said layer of cap material, leaving said at least one etch-resistant sidewall; using said at least one etch-resistant sidewall as a hardmask, etching said structure layer to form at least one sub-lithographic structure.