Method and apparatus for increase strain effect in a transistor channel
First Claim
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1. A method of enhancing stress in a semiconductor device having a gate stack disposed on a substrate, comprising:
- depositing a nitride film along a surface of the substrate and the gate stack having sidewalls,wherein the deposited nitride film is thicker over a surface of the substrate and thinner over a portion of the gate stack and is thinner over a portion of the sidewalls of the gate stack than over the portion of the same gate stack.
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Abstract
Method of enhancing stress in a semiconductor device having a gate stack disposed on a substrate. The method utilizes depositing a nitride film along a surface of the substrate and the gate stack. The nitride film is thicker over a surface of the substrate and thinner over a portion of the gate stack.
118 Citations
29 Claims
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1. A method of enhancing stress in a semiconductor device having a gate stack disposed on a substrate, comprising:
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depositing a nitride film along a surface of the substrate and the gate stack having sidewalls, wherein the deposited nitride film is thicker over a surface of the substrate and thinner over a portion of the gate stack and is thinner over a portion of the sidewalls of the gate stack than over the portion of the same gate stack. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of enhancing stress in a semiconductor device, comprising:
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depositing a layer of nitride film over a gate stack and a surface of a substrate such that the nitride film is thinner over a portion of vertical sides of the gate stack than over the same gate stack; and removing the nitride film over the gate stack to provide enhanced stress in a transistor channel under the gate stack, wherein a gate is about 60 nm wide, a spacer is about 50 rim wide, and the nitride film provides a stress of about 2.0 GPa, the enhanced stress in the transistor channel is greater than approximately 4.5×
109 dynes/cm2 at about 5 nm below a gate oxide, andwherein, after the removing, a portion of the layer of nitride film remains on the surface of the substrate. - View Dependent Claims (9, 10, 11, 12, 13, 17, 18)
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14. A method of enhancing stress in a semiconductor device, comprising:
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depositing a layer of nitride film over a gate stack and a surface of a substrate; removing the nitride film on the gate stack to provide enhanced stress in a transistor channel under the gate stack; depositing a resist material on a surface of the nitride film over the substrate while leaving a surface of the nitride film proximate an upper portion of the gate stack exposed; and removing an upper portion of the gate stack and the nitride film disposed thereon, wherein a gate is about 60 nm wide, a spacer is about 50 nm wide, and the nitride film provides a stress of about 2.0 GPa, the enhanced stress in the transistor channel is greater than approximately 4.5×
109 dynes/cm2 at about 5 nm below a gate oxide. - View Dependent Claims (15, 16)
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19. A method of enhancing stress in a semiconductor device, comprising:
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depositing a layer of nitride film over a gate stack and a surface of a substrate; removing the nitride film over the gate stack to provide enhanced stress in a transistor channel under the gate stack; and forming sidewalls only at a lower portion of the gate stack, wherein, after the depositing, the deposited nitride film is thicker over an upper surface of the gate stack and thinner over a portion of side surfaces of the same gate stack.
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20. A method of enhancing stress in a semiconductor device, comprising:
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depositing a layer of nitride film over a gate stack and a surface of a substrate such that the nitride film is thinner over a portion of side surfaces of the gate stack than over the same gate stack; and removing the nitride film over the gate stack to provide enhanced stress in a transistor channel under the gate stack, wherein for a semiconductor device having a gate about 60 nm wide, a spacer about 50 nm wide, and a nitride film stress of about 2.0 GPa, the enhanced stress in the transistor channel is greater than approximately 5.5×
109 dynes/cm2 at about 5 nm below a gate oxide, andwherein, after the removing, a portion of the layer of nitride film remains on the surface of the substrate. - View Dependent Claims (21, 22, 23)
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24. A method of enhancing stress in a semiconductor device, comprising:
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depositing a layer of nitride film over a gate stack and a surface of a substrate; removing the nitride film on the gate stack to provide enhanced stress in a transistor channel under the gate stack; depositing a resist material on a surface of the nitride film over the substrate while leaving a surface of the nitride film proximate an upper portion of the gate stack exposed; and removing an upper portion of the gate stack and the nitride film disposed thereon, wherein for a semiconductor device having a gate about 60 nm wide, a spacer about 50 nm wide, and a nitride film stress of about 2.0 GPa, the enhanced stress in the transistor channel is greater than approximately 5.5×
109 dynes/cm2 at about 5 nm below a gate oxide. - View Dependent Claims (25, 26)
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27. A method of enhancing stress in a semiconductor device, comprising:
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depositing a layer of nitride film over a gate stack and a surface of a substrate such that the nitride film is thinner over a portion of side surfaces of the gate stack than over the same gate stack; and removing the nitride film over the gate stack to provide enhanced stress in a transistor channel under the gate stack., wherein for a semiconductor device having a gate about 60 nm wide, a spacer about 50 nm wide, and a nitride film stress of about 2.0 GPa, the enhanced stress in the transistor channel is greater than approximately 5.5×
109 dynes/cm2 at about 5 nm below a gate oxide, andfurther comprising forming spacers at a lower portion of the sidewalls of the gate stack. - View Dependent Claims (28)
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29. A method of enhancing stress in a semiconductor device having a gate stack disposed on a substrate having a gate oxide formed on its upper surface, comprising:
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forming spacers on sides of a polysilicon gate; depositing a nitride film along a surface of the substrate and the gate stack such that the nitride film is thinner over a portion of the spacers than over the same gate stack; applying a spin on material; and removing a portion of the nitride film covering the gate stack and a top portion of the gate stack, wherein the nitride film is thicker over a surface of the substrate and thinner over a portion of the same gate stack.
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Specification