Deposition of SiN
First Claim
1. A method of forming a SiN thin film on a substrate in a reaction space comprising:
- contacting the substrate with a silicon precursor comprising iodine to provide a first silicon species adsorbed on a surface of the substrate;
contacting the substrate comprising the first silicon species adsorbed on the surface with a first plasma comprising activated hydrogen species thereby forming SiN on the substrate; and
conducting a nitrogen plasma treatment, wherein the nitrogen plasma treatment comprises contacting the substrate comprising SiN with a second plasma formed from a nitrogen containing gas substantially free of hydrogen-containing species to form the SiN thin film; and
further comprising exposing the substrate to a third plasma different from at least one of the first plasma and the second plasma.
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Abstract
Methods and precursors for forming silicon nitride films are provided. In some embodiments, silicon nitride can be deposited by atomic layer deposition (ALD), such as plasma enhanced ALD. In some embodiments, deposited silicon nitride can be treated with a plasma treatment. The plasma treatment can be a nitrogen plasma treatment. In some embodiments the silicon precursors for depositing the silicon nitride comprise an iodine ligand. The silicon nitride films may have a relatively uniform etch rate for both vertical and the horizontal portions when deposited onto three-dimensional structures such as FinFETS or other types of multiple gate FETs. In some embodiments, various silicon nitride films of the present disclosure have an etch rate of less than half the thermal oxide removal rate with diluted HF (0.5%). In some embodiments, a method for depositing silicon nitride films comprises a multi-step plasma treatment.
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Citations
28 Claims
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1. A method of forming a SiN thin film on a substrate in a reaction space comprising:
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contacting the substrate with a silicon precursor comprising iodine to provide a first silicon species adsorbed on a surface of the substrate; contacting the substrate comprising the first silicon species adsorbed on the surface with a first plasma comprising activated hydrogen species thereby forming SiN on the substrate; and conducting a nitrogen plasma treatment, wherein the nitrogen plasma treatment comprises contacting the substrate comprising SiN with a second plasma formed from a nitrogen containing gas substantially free of hydrogen-containing species to form the SiN thin film; and further comprising exposing the substrate to a third plasma different from at least one of the first plasma and the second plasma. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of depositing a SiN thin film on a substrate in a reaction space comprising:
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exposing the substrate to a silicon precursor comprising iodine such that silicon species adsorb onto a surface of the substrate; and exposing the substrate comprising the silicon species adsorbed onto the surface to a first nitrogen-containing plasma, and a second different plasma and exposing the substrate to a third plasma different from at least one of the first plasma and the second plasma. - View Dependent Claims (15, 16, 17)
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18. A method of depositing a SiN thin film on a substrate in a reaction space, comprising:
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exposing the substrate to a silicon halide such that silicon species adsorb onto a surface of the substrate; exposing the substrate to a first plasma generated using nitrogen-containing and hydrogen-containing gas; exposing the substrate to a second plasma generated using hydrogen-containing gas; exposing the substrate to a third plasma generated using hydrogen-containing gas and nitrogen-containing gas; and repeating exposing the substrate to the silicon halide, and the first plasma, the second plasma and the third plasma. - View Dependent Claims (19, 20, 21)
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22. A method of forming a SiN thin film on a substrate in a reaction space, comprising:
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depositing SiN on the substrate using an atomic layer deposition process, wherein the atomic layer deposition process comprises; contacting the substrate with a silicon precursor comprising iodine; and subsequently contacting the substrate with a first plasma; and conducting a nitrogen plasma treatment upon the deposited SiN, wherein the nitrogen plasma treatment comprises contacting the substrate comprising the SiN with a second plasma formed from a nitrogen containing gas and substantially free of hydrogen-containing species; and exposing the substrate to a third plasma different from at least one of the first plasma and the second plasma. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification