Patent ID: 9159627
Filing Date: 2015-10-13
Classification: H01L

Abstract:
1. A method for fabricating a mask for etching of linear-shaped structures for an integrated circuit, comprising: forming a plurality of linear-shaped core structures of a first material on an underlying material, the plurality of linear-shaped core structures formed to extend lengthwise in a parallel manner so as to have commonly oriented lengthwise sidewalls; after forming the plurality of linear-shaped core structures of the first material, conformally depositing a layer of a second material over each of the linear-shaped core structures and exposed portions of the underlying material; after conformally depositing the layer of the second material, etching the layer of the second material so as to leave a filament of the second material on each lengthwise sidewall of each of the linear-shaped core structures and so as to remove the second material from the underlying material; after etching the layer of the second material, depositing a third material over each filament of the second material; after depositing the third material, removing a portion of the third material so as to expose an entirety of at least one of the plurality of linear-shaped core structures of the first material and an entirety of each of the filaments of the second material present along each of its lengthwise sidewalls; after removing the portion of the third material, etching the exposed filaments of the second material so as to leave thinner filaments of the second material as measured in a direction perpendicular to the lengthwise sidewalls of the plurality of linear-shaped core structures; and after etching the exposed filaments of the second material so as to leave thinner filaments of the second material, removing the third material and the plurality of linear-shaped core structures of the first material so as to leave the filaments of the second material on the underlying material, whereby the filaments of the second material provides a mask for etching the underlying material.