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Selective deposition of silicon nitride on silicon oxide using catalytic control

  • US 10,242,866 B2
  • Filed: 03/08/2017
  • Issued: 03/26/2019
  • Est. Priority Date: 03/08/2017
  • Status: Active Grant
First Claim
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1. A method of depositing silicon nitride selectively on an exposed silicon oxide surface of a substrate, the method comprising:

  • providing the substrate having the exposed silicon oxide surface and an exposed silicon surface;

    exposing the substrate to trimethylaluminum to form an aluminum-containing moiety selectively on the exposed silicon oxide surface relative to the exposed silicon surface; and

    performing one or more cycles of thermal atomic layer deposition, each cycle comprising exposing the substrate to an aminosilane precursor and exposing the substrate to a hydrazine without igniting a plasma to form silicon nitride selectively on the exposed silicon oxide surface relative to the exposed silicon surface,wherein the hydrazine has a chemical structure of;

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