Integrated circuit device with well controlled surface proximity and method of manufacturing same
First Claim
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1. A method comprising:
- forming a gate structure over a semiconductor substrate;
performing a first implantation process with a first dopant on the substrate, thereby forming a lightly doped source and drain (LDD) region in the substrate, the LDD region being interposed by the gate structure;
performing a second implantation process with a second dopant on the substrate by performing a tilt-angle ion implantation process, the second dopant being opposite the first dopant, thereby forming a doped region in the substrate, the doped region being interposed by the gate structure and spaced a distance from the gate structure; and
after performing the first and second implantation processes, forming source and drain features on each side of the gate structure, wherein forming the source and drain features includes performing a first etching process and a second etching process to the semiconductor substrate to form a recess that defines a source and drain region in the semiconductor substrate, wherein the first etching process is different than the second etching process.
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Abstract
An integrated circuit device and method for manufacturing the integrated circuit device is disclosed. The disclosed method provides improved control over a surface proximity and tip depth of integrated circuit device. In an embodiment, the method achieves improved control by forming a doped region and a lightly doped source and drain (LDD) region in a source and drain region of the device. The doped region is implanted with a dopant type opposite the LDD region.
26 Citations
21 Claims
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1. A method comprising:
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forming a gate structure over a semiconductor substrate; performing a first implantation process with a first dopant on the substrate, thereby forming a lightly doped source and drain (LDD) region in the substrate, the LDD region being interposed by the gate structure; performing a second implantation process with a second dopant on the substrate by performing a tilt-angle ion implantation process, the second dopant being opposite the first dopant, thereby forming a doped region in the substrate, the doped region being interposed by the gate structure and spaced a distance from the gate structure; and after performing the first and second implantation processes, forming source and drain features on each side of the gate structure, wherein forming the source and drain features includes performing a first etching process and a second etching process to the semiconductor substrate to form a recess that defines a source and drain region in the semiconductor substrate, wherein the first etching process is different than the second etching process. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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forming a gate structure over a substrate; implanting a first dopant on the substrate, thereby forming a lightly doped source and drain (LDD) region in the substrate, the LDD region being interposed by the gate structure; implanting a second dopant on the substrate by performing a tilt-angle ion implantation process to form a doped region; forming a spacer on a sidewall of the gate structure, wherein the doped region extends within the substrate directly under the spacer; and forming source and drain features on the substrate, the source and drain features being interposed by the gate structure, wherein forming the source and drain features includes removing a portion of the doped region such that the doped region no longer extends within the substrate directly under the spacer. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification