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Through substrate vias with improved connections

  • US 9,704,783 B2
  • Filed: 02/29/2016
  • Issued: 07/11/2017
  • Est. Priority Date: 04/28/2010
  • Status: Active Grant
First Claim
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1. A method of manufacturing a device, the method comprising:

  • forming a dielectric structure comprising a plurality of metallization layers including at least a bottom metallization layer and a top metallization layer, the plurality of metallization layers each formed in a respective one of a plurality of dielectric layers;

    forming a passivation layer over the top metallization layer of the dielectric structure;

    etching a first opening in the passivation layer and the dielectric structure, wherein the first opening exposes a metal pad disposed in one of the plurality of dielectric layers;

    etching a second opening through the passivation layer and the dielectric structure and into a portion of a substrate disposed below the dielectric structure, wherein the etching the first opening and the etching the second opening occur simultaneously;

    lining a top surface of the passivation layer and sidewalls and a bottom surface of each of the first opening and the second opening with an insulation layer;

    removing portions of the insulation layer along the bottom surface of the first opening to expose the metal pad;

    after removing the portions of the insulation layer, forming a diffusion barrier layer over the top surface of the passivation layer and along the sidewalls and the bottom surface of each of the first opening and the second opening; and

    simultaneously filling the first opening and the second opening with a conductive material, an uppermost surface of the conductive material extending above an uppermost surface of the passivation layer.

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