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Method for controlling the shape of the etch front in the etching of polysilicon

  • US 6,284,665 B1
  • Filed: 12/17/1999
  • Issued: 09/04/2001
  • Est. Priority Date: 08/31/1998
  • Status: Expired due to Fees
First Claim
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1. A method of controlling a shape of an etch front during plasma etching of polysilicon within a recess, wherein said etch front is W-shaped, and wherein said method comprises controlling the composition of a plasma source gas used to etch said polysilicon, so that said plasma source gas includes from about 80% to about 95% by volume of a fluorine-comprising gas, and from about 5% to about 20% by volume of an additive gas selected from the group consisting of a bromine-comprising gas, a chlorine-comprising gas, an iodine-comprising gas, or a combination thereof.

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