CMOS device
First Claim
1. A method, comprising:
- providing a substrate having an NMOS device adjacent a PMOS device;
forming a first stress layer over the NMOS and PMOS devices, the first stress layer comprising one of a first tensile-stress layer and a compression-stress layer;
forming an etch stop layer over the first stress layer;
removing the first stress layer and the etch stop layer from over the NMOS device, leaving the first stress layer and the etch stop layer over the PMOS device;
forming a second tensile-stress layer over the NMOS device and over the first stress layer and the etch stop layer over the PMOS device; and
removing the second tensile-stress layer and the etch stop layer from over the PMOS device, leaving the second tensile-stress layer over the NMOS device.
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Accused Products
Abstract
A method comprising providing a substrate having an NMOS device adjacent a PMOS device and forming a first stress layer over the NMOS and PMOS devices, wherein the first stress layer comprises a first tensile-stress layer or a compression-stress layer. An etch stop layer is formed over the first stress layer, and portions of the first stress layer and the etch stop layer are removed from over the NMOS device, leaving the first stress layer and the etch stop layer over the PMOS device. A second tensile-stress layer is formed over the NMOS device and over the first stress layer and the etch stop layer, and portions of the second tensile-stress layer and the etch stop layer are removed from over the PMOS device, leaving the second tensile-stress layer over the NMOS device.
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Citations
30 Claims
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1. A method, comprising:
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providing a substrate having an NMOS device adjacent a PMOS device; forming a first stress layer over the NMOS and PMOS devices, the first stress layer comprising one of a first tensile-stress layer and a compression-stress layer; forming an etch stop layer over the first stress layer; removing the first stress layer and the etch stop layer from over the NMOS device, leaving the first stress layer and the etch stop layer over the PMOS device; forming a second tensile-stress layer over the NMOS device and over the first stress layer and the etch stop layer over the PMOS device; and removing the second tensile-stress layer and the etch stop layer from over the PMOS device, leaving the second tensile-stress layer over the NMOS device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method, comprising:
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forming a first stress layer over at least one of an NMOS device and a PMOS device each located in a substrate, the first stress layer comprising one of a first tensile-stress layer and a compression-stress layer; forming an etch stop layer over at least a portion of the first stress layer; removing at least a portion of the first stress layer and the etch stop layer from over at least the NMOS device, leaving at least a portion of the first stress layer and at least a portion of the etch stop layer over at least a substantial portion of the PMOS device; forming a second stress layer over at least one of the NMOS device and the first stress layer, the second stress layer comprising a second tensile-stress layer; and removing at least a portion of the second stress layer from over at least the PMOS device, leaving at least a portion of the second stress layer over at least a substantial portion of the NMOS device. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification