Pseudomorphic Si/SiGe/Si body device with embedded SiGe source/drain
First Claim
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1. A semiconductor device structure, comprising:
- a substrate;
first and second gate stacks disposed on the substrate;
the first gate stack comprising at least one silicon layer, and a source/drain region adjacent to the first gate stack, the source/drain region comprising a compressive inducing material to place the first gate stack in a compressive state;
the second gate stack comprising a first silicon layer disposed on the substrate, and a tensile producing material disposed on the first silicon layer, a second silicon layer disposed on the tensile producing material to induce a tensile stress component under the second gate stack, and silicon raised source/drain regions contacting the first silicon layer, the second silicon layer and the tensile producing material, wherein the tensile producing material is a SiGe layer forming part of the second gate stack.
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Abstract
The invention relates to a semiconductor structure and method of manufacturing and more particularly to a CMOS device with at least one embedded SiGe layer in the source/drain region of the PFET, and at least one embedded SiGe layer in the channel region of the NFET. In one embodiment, the structure of the invention enhances the electron mobility in the NFET device, and further enhances the hole mobility in the PFET device. Additionally, by using the fabrication methods and hence achieving the final structure of the invention, it is also possible to construct a PFET and NFET each with embedded SiGe layers on the same substrate.
127 Citations
20 Claims
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1. A semiconductor device structure, comprising:
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a substrate; first and second gate stacks disposed on the substrate; the first gate stack comprising at least one silicon layer, and a source/drain region adjacent to the first gate stack, the source/drain region comprising a compressive inducing material to place the first gate stack in a compressive state; the second gate stack comprising a first silicon layer disposed on the substrate, and a tensile producing material disposed on the first silicon layer, a second silicon layer disposed on the tensile producing material to induce a tensile stress component under the second gate stack, and silicon raised source/drain regions contacting the first silicon layer, the second silicon layer and the tensile producing material, wherein the tensile producing material is a SiGe layer forming part of the second gate stack. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A semiconductor device structure, comprising:
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a NFET device and a PFET device disposed on a substrate; the PFET device comprising a first gate stack; the NFET device comprising a second gate stack; wherein the first gate stack comprises at least one PFET silicon layer and an adjacent source/drain region, the source/drain region comprising at least one SiGe layer to induce a compressive stress and a source/drain silicon layer directly on the at least one SiGe layer; and wherein the second gate stack comprises at least one NFET silicon layer formed on a SiGe layer to induce a tensile stress. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A semiconductor device structure, comprising:
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a PFET device comprising; a PFET silicon layer including a central upper surface and lateral upper surfaces, wherein the PFET silicon layer is formed directly on a substrate and the central upper surface is higher than the lateral upper surfaces; PFET source/drain regions comprising a first layer contacting the lateral upper surfaces of the PFET silicon layer and a first silicon layer contacting an upper surface of the first layer, wherein the first layer is composed of a material that induces compressive stress in a central portion of the PFET silicon layer; a gate disposed on the PFET silicon layer; and at least one of oxide and nitride spacers arranged laterally beside the gate and contacting the PFET silicon layer; and an NFET device comprising; an NFET silicon layer formed directly on the substrate; a layer of tensile stress producing material disposed directly on the NFET silicon layer; a second silicon layer disposed directly on the a layer of tensile stress producing material; NFET source/drain regions comprising silicon contacting the NFET silicon layer, wherein a bottom surface of the layer of tensile stress producing material is at a same level as a bottom surface of the silicon of the NFET source/drain regions. - View Dependent Claims (20)
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Specification