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Method for delivering an involatile reagent in vapor form to a CVD reactor

  • US 5,204,314 A
  • Filed: 12/13/1991
  • Issued: 04/20/1993
  • Est. Priority Date: 07/06/1990
  • Status: Expired due to Term
First Claim
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1. A process for delivering an involatile solid source reagent material having a vapor pressure of less than about 0.1 torr at 25°

  • C. and 1 atmosphere conditions, and which is thermally unstable at its vaporization temperature, as a source regent material vapor into a CVD reactor, said process comprising;

    providing a supply vessel containing a reagent source liquid formed by dissolving the involatile solid source reagent material in a non-azotropic organic solvent, wherein the reagent source liquid is contained in the supply vessel in a non-heated state, at or below room temperature;

    arranging a flash vaporization structure comprising a foraminous element having a surface-to-volume ratio of at least 4, in liquid flow communication with the supply vessel containing the reagent source liquid;

    heating the foraminous element to a flash vaporization temperature for the involatile solid source reagent material; and

    flowing the reagent source liquid from the supply vessel to the heated foraminous element, with the reagent source liquid in a non-atomized state directly issuing a liquid stream of the reagent source liquid onto the heated foraminous element, and flash vaporizing the involatile solid source material from the reagent source liquid to form the source reagent material vapor.

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