Selective deposition of noble metal thin films
First Claim
1. A method for selectively depositing a thin film comprising one or more noble metals on a substrate comprising a first surface and a second surface, the method comprising:
- contacting the substrate with a gaseous noble metal precursor;
providing a second reactant gas pulse comprising oxygen to the reaction chamber; and
repeating until a thin film of a desired thickness is obtained selectively on the first surface,wherein the second surface comprises a material selected from the group consisting of silicon oxides, silicon nitrides, silicon oxynitrides, fluorinated silica glass (FSG), carbon doped silicon oxide (SiOC) and materials containing more than about 50% silicon oxide and wherein the temperature is below about 400°
C.
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Abstract
Processes are provided for selectively depositing thin films comprising one or more noble metals on a substrate by vapor deposition processes. In some embodiments, atomic layer deposition (ALD) processes are used to deposit a noble metal containing thin film on a high-k material, metal, metal nitride or other conductive metal compound while avoiding deposition on a lower k insulator such as silicon oxide. The ability to deposit on a first surface, such as a high-k material, while avoiding deposition on a second surface, such as a silicon oxide or silicon nitride surface, may be utilized, for example, in the formation of a gate electrode.
230 Citations
18 Claims
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1. A method for selectively depositing a thin film comprising one or more noble metals on a substrate comprising a first surface and a second surface, the method comprising:
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contacting the substrate with a gaseous noble metal precursor; providing a second reactant gas pulse comprising oxygen to the reaction chamber; and repeating until a thin film of a desired thickness is obtained selectively on the first surface, wherein the second surface comprises a material selected from the group consisting of silicon oxides, silicon nitrides, silicon oxynitrides, fluorinated silica glass (FSG), carbon doped silicon oxide (SiOC) and materials containing more than about 50% silicon oxide and wherein the temperature is below about 400°
C. - 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 fabricating a semiconductor device, comprising:
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forming a patterned gate dielectric layer over a semiconductor substrate; and forming a gate electrode over the gate dielectric layer, wherein forming the gate electrode comprises selectively depositing a film comprising one or more noble metals over the gate dielectric layer by a vapor deposition process, wherein the film comprises ruthenium, and wherein forming the gate electrode additionally comprises depositing a different conductive material over the film comprising ruthenium.
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17. A method for selectively depositing a noble metal layer on a substrate comprising a first surface and a second insulating surface, the first surface comprising a high k material, metal, metal nitride or conductive metal oxide, the method comprising depositing a layer comprising a noble metal on the first surface relative to the second surface using an atomic layer deposition (ALD) process at a temperature of less than about 400°
- C., wherein both the first surface and second surface are contacted with each of at least two reactants.
- View Dependent Claims (18)
Specification