Patent ID: 7271107
Filing Date: 2007-09-18
Classification: H01L

Abstract:
1. A method for forming features in an etch layer, comprising: forming a first mask over the etch layer wherein the first mask defines a plurality of spaces with widths and a first pitch; forming a sidewall layer over the first mask wherein the sidewall layer reduces the widths of the spaces defined by the first mask, wherein the forming sidewall layer over the first mask comprises at least two cycles, wherein each cycle comprises: a deposition phase with a first gas chemistry to form a deposition plasma to form a deposition over the sidewalls of the first mask; and a profile shaping phase with a second gas chemistry to shape the profile of the deposition over the sidewalls of the first mask, wherein the first gas chemistry is different than the second gas chemistry; etching features into the etch layer through the sidewall layer, wherein the features have widths that are smaller than the widths of the spaces defined by the first mask; removing the mask and sidewall layer; and performing an additional feature step, comprising: