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Method for forming a grown bipolar electrode contact using a sidewall seed

  • US 5,213,989 A
  • Filed: 06/24/1992
  • Issued: 05/25/1993
  • Est. Priority Date: 06/24/1992
  • Status: Expired due to Fees
First Claim
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1. A method for forming an electrical contact to a bipolar transistor electrode comprising the steps of:

  • providing a substrate;

    forming a layer of material having a top surface and overlying the substrate;

    forming a contact opening in the layer of material wherein the contact opening exposes a portion of the substrate and has a sidewall, said contact opening having a first radius;

    forming a conductive region within the substrate, the conductive region functioning as a portion of said bipolar transistor electrode;

    forming a sidewall selective source material adjacent the sidewall of the contact opening, the sidewall selective source material reducing the contact opening from the first radius to a second radius wherein the second radius is smaller than the first radius; and

    forming a conductive contact region within the contact opening by growing the conductive contact region using the sidewall selective source material as a growth source, the conductive contact region forming said electrical contact to the bipolar transistor electrode in a reduced growth time due to reduction in radius of the contact opening.

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