MOSFET performance improvement using deformation in SOI structure
First Claim
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1. A method for manufacturing a semiconductor device, comprising steps of:
- forming a buried oxide layer on a silicon substrate;
forming a semiconductor layer on the buried oxide layer such that the buried oxide layer is disposed between the semiconductor layer and the substrate;
performing a first ion-implanting step of an expansion element in a first region of the substrate while masking a second region of the substrate;
performing a second ion-implanting step of a compression element in the second region of the substrate while masking the first region of the substrate, wherein the second ion-implanting step is separate from the first ion-implanting step;
expanding the expansion element to expand the first region of the substrate to push up a first portion of the semiconductor layer and a first portion of the buried oxide layer;
compressing the compression element to compress the second region of the substrate to pull down a second portion of the semiconductor layer and a second portion of the buried oxide layer;
forming a first gate oxide layer of an N type device on the first portion of the semiconductor layer;
forming a first gate electrode on the first gate oxide layer;
forming a second gate oxide layer of a P type device on the second portion of the semiconductor layer; and
forming a second gate electrode on the second gate oxide layer.
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Abstract
A method for manufacturing a semiconductor device is provided. The method includes forming a semiconductor layer on a substrate. The first region of the substrate is expanded to push up the first portion of the semiconductor layer, thereby applying tensile stress to the first portion. The second region of the substrate is compressed to pull down the second portion of the semiconductor layer, thereby applying compressive stress to the second portion. An N type device is formed over the first portion of the semiconductor layer, and a P type device is formed over the second portion of the semiconductor layer.
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Citations
19 Claims
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1. A method for manufacturing a semiconductor device, comprising steps of:
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forming a buried oxide layer on a silicon substrate; forming a semiconductor layer on the buried oxide layer such that the buried oxide layer is disposed between the semiconductor layer and the substrate; performing a first ion-implanting step of an expansion element in a first region of the substrate while masking a second region of the substrate; performing a second ion-implanting step of a compression element in the second region of the substrate while masking the first region of the substrate, wherein the second ion-implanting step is separate from the first ion-implanting step; expanding the expansion element to expand the first region of the substrate to push up a first portion of the semiconductor layer and a first portion of the buried oxide layer; compressing the compression element to compress the second region of the substrate to pull down a second portion of the semiconductor layer and a second portion of the buried oxide layer; forming a first gate oxide layer of an N type device on the first portion of the semiconductor layer; forming a first gate electrode on the first gate oxide layer; forming a second gate oxide layer of a P type device on the second portion of the semiconductor layer; and forming a second gate electrode on the second gate oxide layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 15, 16, 19)
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10. A method for manufacturing a semiconductor device, comprising steps of:
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forming a buried oxide layer on a silicon substrate; forming a semiconductor layer on the buried oxide layer, wherein the buried oxide layer is disposed between the semiconductor layer and the substrate; performing a first ion-implanting step of an expansion element in a first region of the substrate while masking a second region of the substrate; performing a second ion-implanting step of a compression element in the second region of the substrate while masking the first region of the substrate, wherein the second ion-implanting step is separate from the first ion-implanting step; expanding the expansion element to expand the first region of the substrate to provide a tensile stress in the semiconductor layer; compressing the second region of the substrate to provide a compressive stress in the semiconductor layer by annealing to activate the compression element; after the expanding, forming a first gate oxide layer of an N type device on the semiconductor layer over the first region of the substrate; forming a first gate electrode on the first gate oxide layer; after the compressing, forming a second gate oxide layer of a P type device on the semiconductor layer over the second region of the substrate; and forming a second gate electrode on the second gate oxide layer, wherein the expanding pushes up a first portion of the buried oxide layer; and the compressing pulls down a second portion of the buried oxide layer. - View Dependent Claims (11, 12, 13, 14, 17, 18)
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Specification