Patent ID: 11973006
Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. A method, comprising:
etching a cylindrical through-substrate via (TSV) in a substrate from a backside of the substrate up to a frontside of the substrate, the cylindrical TSV enclosing a cylindrical pillar of material of the substrate, the substrate having an insulator layer disposed on the frontside of the substrate and including a metal pad;
depositing a polymer or oxide fill material on the backside of the substrate and in the cylindrical TSV;
removing the cylindrical pillar of the material of the substrate to form a cylindrical TSV;
making a cylindrical contact opening through the cylindrical TSV to the metal pad in the insulator layer, the cylindrical contact opening having a diameter that is smaller than a diameter of the cylindrical TSV; and
depositing a layer of a conductive material in the cylindrical contact opening and on sidewalls of the cylindrical TSV to form a tubular vertical interconnection from the backside of the substrate to the metal pad.