PLANARIZING ETCH HARDMASK TO INCREASE PATTERN DENSITY AND ASPECT RATIO

摘要

Methods for manufacturing a semiconductor device in a processing chamber are provided. In one embodiment, a method includes depositing over a substrate a first base material having a first set of interconnect features, filling an upper portion of the first set of interconnect features with an ashable material, planarizing an upper surface of the first base material such that an upper surface of the ashable material filled in the first set of interconnect features provide a substantial outer planar surface, depositing a film stack comprising a second base material on the substantial planar outer surface, forming a second set of interconnect features in the second base material, wherein the second set of interconnect features are aligned with the first set of interconnect features, and removing the ashable material from the first base material to connect the second set of interconnect features to the first set of interconnect features.