Method for depositing a chlorine-free conformal sin film
First Claim
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1. A method of forming a silicon nitride material on a substrate in a reaction chamber, comprising:
- periodically exposing the substrate to a vapor phase flow of a halogen-free silicon-containing reactant wherein the halogen-free silicon containing reactant is adsorbed onto the surface of the substrate;
exposing the substrate to a vapor phase flow of a first nitrogen-containing reactant wherein the nitrogen-containing reactant is adsorbed onto the surface of the substrate;
exposing the substrate to a vapor phase flow of a second nitrogen-containing reactant that is different from the first nitrogen-containing reactant, wherein the first nitrogen-containing reactant is carbon-free and the second nitrogen-containing reactant contains carbon; and
periodically igniting a plasma in the reaction chamber when vapor phase nitrogen-containing reactant is present in the reaction chamber and the vapor phase flow of the halogen-free silicon-containing reactant has ceased.
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Abstract
Described are methods of making silicon nitride (SiN) materials on substrates. Improved SiN films made by the methods are also included. One aspect relates to depositing chlorine (Cl)-free conformal SiN films. In some embodiments, the SiN films are Cl-free and carbon (C)-free. Another aspect relates to methods of tuning the stress and/or wet etch rate of conformal SiN films. Another aspect relates to low-temperature methods of depositing high quality conformal SiN films. In some embodiments, the methods involve using trisilylamine (TSA) as a silicon-containing precursor.
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Citations
20 Claims
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1. A method of forming a silicon nitride material on a substrate in a reaction chamber, comprising:
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periodically exposing the substrate to a vapor phase flow of a halogen-free silicon-containing reactant wherein the halogen-free silicon containing reactant is adsorbed onto the surface of the substrate; exposing the substrate to a vapor phase flow of a first nitrogen-containing reactant wherein the nitrogen-containing reactant is adsorbed onto the surface of the substrate; exposing the substrate to a vapor phase flow of a second nitrogen-containing reactant that is different from the first nitrogen-containing reactant, wherein the first nitrogen-containing reactant is carbon-free and the second nitrogen-containing reactant contains carbon; and periodically igniting a plasma in the reaction chamber when vapor phase nitrogen-containing reactant is present in the reaction chamber and the vapor phase flow of the halogen-free silicon-containing reactant has ceased. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of forming a silicon nitride material on a substrate in a reaction chamber, comprising:
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periodically exposing the substrate to a vapor phase flow of a silicon-containing reactant wherein the silicon containing reactant is adsorbed onto the surface of the substrate; exposing the substrate to a vapor phase flow of a first nitrogen-containing reactant wherein the nitrogen-containing reactant is adsorbed onto the surface of the substrate; exposing the substrate to a vapor phase flow of a second nitrogen-containing reactant that is different from the first nitrogen-containing reactant, wherein the first nitrogen-containing reactant is carbon-free and the second nitrogen-containing reactant contains carbon; and periodically igniting a plasma in the reaction chamber when vapor phase nitrogen-containing reactant is present in the reaction chamber and the vapor phase flow of the silicon-containing reactant has ceased. - View Dependent Claims (17, 18, 19, 20)
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Specification