CHEMICAL VAPOR DEPOSITION APPARATUS WITH LIQUID FEED
First Claim
1. A method for performing a chemical vapor deposition of a film on a surface of a wafer, comprising the following steps:
- a) solubilizing a nonvolatile precursor in an inorganic solvent to form a liquid solution;
b) transporting said liquid solution as a continuous liquid stream to a control chamber, said transporting performed at a temperature and a pressure to ensure a state of said nonvolatile precursor remains liquid;
c) evaporating said liquid solution in said control chamber to change said state of said nonvolatile precursor to a vapor;
d) creating a reaction between said vapor of said nonvolatile precursor and a reactant vapor; and
e) depositing the film on the surface of the wafer in response to said reaction.
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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. In LSCVD the liquid enters the chamber, contacts the wafer, evaporates, produces a product which is deposited as a thin film on the wafer surface.
21 Citations
18 Claims
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1. A method for performing a chemical vapor deposition of a film on a surface of a wafer, comprising the following steps:
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a) solubilizing a nonvolatile precursor in an inorganic solvent to form a liquid solution;
b) transporting said liquid solution as a continuous liquid stream to a control chamber, said transporting performed at a temperature and a pressure to ensure a state of said nonvolatile precursor remains liquid;
c) evaporating said liquid solution in said control chamber to change said state of said nonvolatile precursor to a vapor;
d) creating a reaction between said vapor of said nonvolatile precursor and a reactant vapor; and
e) depositing the film on the surface of the wafer in response to said reaction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for depositing a film on a surface, comprising the following steps:
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a) combining a nonvolatile precursor and an inorganic solvent to form a solution;
b) adjusting a temperature and a pressure in order to maintain said solution in a liquid state;
c) transporting said solution as a liquid stream to a chamber;
d) vaporizing the solution at said chamber to form a precursor vapor;
e) creating a reaction with a reactant vapor and said precursor vapor; and
f) depositing the film on the surface in response to said step of creating.
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Specification