Patent ID: 9054160
Filing Date: 2015-06-09
Classification: H01L

Abstract:
1. A method for fabricating an interconnect structure comprising: forming a permanent antireflective coating on a substrate; forming a pattern of shaped photoresist structures with spaces therebetween having a profile which narrows towards a top of the shaped structures directly on the permanent antireflective coating; filling the spaces between the shaped photoresist structures of the pattern with an interlevel dielectric composition without substantially altering a shape and size of the shaped photoresist structures, and the interlevel dielectric composition includes a material that becomes a permanent interlevel dielectric layer; removing the shaped photoresist structures to provide shaped openings to form a reverse image pattern in the interlevel dielectric composition, the shaped openings having an inverse profile which narrows towards a top of the shaped openings; and filling the shaped openings with an electrically conductive fill material.