Patent ID: 6420259
Filing Date: 2002-07-16
Classification: H01L

Abstract:
A method of making a self-aligned interconnect between and in contact with a pair of raised structures on a substrate that are enclosed in an electrical insulation layer, each said raised structure being enclosed and electrically isolated above the substrate by an enclosure, each said enclosure having a planar top surface intersecting and being perpendicular to opposing lateral sidewalls of said enclosure, the method comprising:forming a layer of a masking material over the electrical insulation layer; patterning the layer of the masking material to form, vertically aligned with and above each said raised structure, a portion of the layer of the masking material; exposing the substrate between the pair of raised structures by removing the electrical insulation layer between the pair of raised structures while leaving a portion of the electrical insulation layer upon each said enclosure; removing the masking material upon each said portion of the electrical insulation layer upon each said enclosure; forming an electrically conductive fill layer upon the substrate between each said portion of the electrical insulation layer upon each said enclosure; and removing a portion of the electrically conductive fill layer to form said self-aligned interconnect that is in contact with: each said portion of the electrical insulation layer upon each said enclosure; and each said enclosure on each said raised structure.