Please download the dossier by clicking on the dossier button x
×

Cyclic oxide spacer etch process

  • US 9,818,621 B2
  • Filed: 01/04/2017
  • Issued: 11/14/2017
  • Est. Priority Date: 02/22/2016
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method of patterning a substrate, comprising:

  • biasing a substrate in a processing chamber, the substrate having mandrel structures and silicon oxide spacer material formed thereon;

    exposing the silicon oxide spacer material to an inert plasma to implant ions in one or more regions of the silicon oxide spacer material at a first pressure;

    exposing the implanted regions of the silicon oxide spacer material to an etchant plasma to remove a portion of the silicon oxide spacer material in the processing chamber at a second pressure, wherein the second pressure is at least about three orders of magnitude greater than the first pressure;

    repeating the exposing the silicon oxide spacer material to an inert plasma and the exposing the implanted regions of the silicon oxide spacer material to an etchant plasma until the mandrel structures are exposed;

    removing the mandrel structures; and

    repeating the exposing the silicon oxide spacer material to an inert plasma and the exposing the implanted regions of the silicon oxide spacer material to an etchant plasma until a uniform silicon oxide spacer material top surface profile is achieved.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×