Method of making a transistor having a deposited dual-layer spacer structure
First Claim
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1. A method of forming a transistor, comprising the steps of:
- a. forming a gate electrode over a dielectric;
b. depositing a first dielectric layer over the gate electrode, the first dielectric layer comprising an oxide;
c. depositing a second dielectric layer over the first dielectric layer;
d. etching back the second dielectric layer using a substantially anisotropic etch, thereby forming an upper region of a spacer, said spacer adjacent to the gate electrode; and
e. forming a doped region adjacent to said gate electrode such that said doped region is formed prior to the deposition of said first and second dielectric layers.
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Abstract
A transistor comprising a deposited dual-layer spacer structure and method of fabrication. A polysilicon layer is deposited over a gate dielectric, and is subsequently etched to form the polysilicon gate electrode of the transistor. Next, oxide is deposited over the surface of the gate electrode, followed by deposition of a second dielectric layer. Spacers are then formed adjacent to the gate electrode by etching back the second dielectric layer using a substantially anisotropic etch which etches the second dielectric layer faster than it etches the oxide.
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Citations
23 Claims
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1. A method of forming a transistor, comprising the steps of:
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a. forming a gate electrode over a dielectric; b. depositing a first dielectric layer over the gate electrode, the first dielectric layer comprising an oxide; c. depositing a second dielectric layer over the first dielectric layer; d. etching back the second dielectric layer using a substantially anisotropic etch, thereby forming an upper region of a spacer, said spacer adjacent to the gate electrode; and e. forming a doped region adjacent to said gate electrode such that said doped region is formed prior to the deposition of said first and second dielectric layers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of forming a transistor, comprising the steps of:
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a. forming a gate electrode over a gate dielectric, the gate electrode comprising polysilicon; b. depositing a first dielectric layer directly on the gate electrode, the first dielectric layer comprising an oxide; c. depositing a second dielectric layer directly on the first dielectric layer, the second dielectric layer comprising nitride; d. etching back the second dielectric layer using a substantially anisotropic etch, thereby forming an upper region of a spacer, said spacer adjacent to the gate electrode; and e. forming a doped region adjacent to said gate electrode such that said doped region is formed prior to the deposition of said first and second dielectric layers. - View Dependent Claims (13, 14, 15, 16)
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17. A method of forming a transistor, comprising the steps of:
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a. depositing a polysilicon layer over a gate dielectric; b. etching the polysilicon layer to form a polysilicon gate electrode; c. implanting a first dose of a first dopant to form a tip region; d. depositing a first dielectric layer directly on the polysilicon gate electrode, after forming said tip region, the first dielectric layer being oxide; e. depositing a second dielectric layer directly on the first dielectric layer, the second dielectric layer being nitride; f. etching back the second dielectric layer using a substantially anisotropic etch, thereby forming an upper region of a spacer, said spacer adjacent to the polysilicon gate electrode; and g. implanting a second dose of a second dopant to form a source/drain region. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A method of forming a transistor, comprising the steps of:
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a. forming a gate electrode over a dielectric; b. depositing a first undoped dielectric layer over the gate electrode, the first dielectric layer comprising an oxide; c. depositing a second dielectric layer over the first dielectric layer; and d. etching back the second dielectric layer using a substantially anisotropic etch, thereby forming an upper region of a spacer, said spacer adjacent to the gate electrode; e. forming a doped region adjacent to said gate electrode such that said doped region is formed prior to the deposition of said first and second dielectric layers.
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Specification