Patents Examined by Schrive Beck
  • Patent number: 5393564
    Abstract: The invention is a method directed to the use of a nonvolatile precursor, either a solid precursor or a liquid precursor, suitable for chemical vapor deposition (CVD), including liquid source CVD (LSCVD), of a semiconductor film. Using the method of the invention the nonvolatile precursor is dissolved in a solvent. The choice of solvent is typically an inorganic compound that has a moderate to high vapor pressure at room temperature and that can be liquified by a combination of pressure and cooling. The solution thus formed is then transported at an elevated pressure and/or a reduced temperature to the CVD chamber. In CVD the solution evaporates at a higher temperature and a lower pressure upon entry to the CVD chamber, and the nonvolatile precursor, in its gaseous state, along with a gas reactant, produces a product which is deposited as a thin film on a semiconductor wafer.
    Type: Grant
    Filed: May 2, 1994
    Date of Patent: February 28, 1995
    Assignee: Micron Semiconductor, Inc.
    Inventors: Donald L. Westmoreland, Gurtej S. Sandhu