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Method of bonding a semiconductor substrate to a support substrate and structure therefore

  • US 5,341,979 A
  • Filed: 09/03/1993
  • Issued: 08/30/1994
  • Est. Priority Date: 09/03/1993
  • Status: Expired due to Fees
First Claim
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1. A method of bonding a semiconductor substrate to a support substrate, comprising the steps of:

  • providing the support substrate, wherein the support substrate has a first principal surface and at least one contact structure on the first principal surface;

    providing the semiconductor substrate, wherein the semiconductor substrate has a first major surface, a second major surface, and at least one bonding pad on the first major surface, the at least one bonding pad corresponding to the at least one contact structure;

    covering the at least one bonding pad and a portion of the first major surface with a first layer of photoresist;

    forming an opening in the first layer of photoresist, wherein the opening has a mouth and exposes the at least one bonding pad;

    narrowing the mouth of the opening;

    coating the first layer of photoresist with a second layer of photoresist, wherein coating the first layer of photoresist fills the narrowed mouth of the opening;

    re-opening the opening, wherein the reopened opening has an hourglass shape;

    filling the hourglass shaped opening with an electrically conductive material;

    removing the first and the second layers of photoresist, wherein an hourglass shaped bump is formed on the at least one bonding pad; and

    bonding the electrically conductive material filling the hourglass shaped opening to the at least one contact structure.

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