Strained channel integrated circuit devices
First Claim
1. A device comprising:
- a substrate having a first strained channel region and a second strained channel region therein, the second channel region being strained in a different manner than the first channel region;
a first gate structure including;
a dielectric layer disposed at least partly over the first channel region, the dielectric layer including an interfacial layer physically in contact with the first channel region;
a barrier layer disposed at least partly over the first channel region and physically in contact with the dielectric layer;
a first conductive layer disposed over the barrier layer, and having a characteristic with a first value;
a strain-inducing conductive layer disposed over the first conductive layer, and having the characteristic with a second value, wherein the second value is different from the first value; and
a second conductive layer disposed over the strain-inducing conductive layer, and having the characteristic with the first value; and
a second gate structure including;
a high-k dielectric layer disposed at least partly over the second channel region;
a U-shaped work function metal layer disposed over the high-k dielectric layer, the U-shaped work function metal layer forming an opening having opposing surfaces therein; and
a metal fill layer disposed at least partially within the opening such that the metal fill layer is in physical contact with the opposing surfaces.
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Accused Products
Abstract
An apparatus includes a substrate having a strained channel region, a dielectric layer over the channel region, first and second conductive layers over the dielectric layer having a characteristic with a first value, and a strain-inducing conductive layer between the conductive layers having the characteristic with a second value different from the first value. A different aspect involves an apparatus that includes a substrate, first and second projections extending from the substrate, the first projection having a tensile-strained first channel region and the second projection having a compression-strained second channel region, and first and second gate structures engaging the first and second projections, respectively. The first gate structure includes a dielectric layer, first and second conductive layers over the dielectric layer, and a strain-inducing conductive layer between the conductive layers. The second gate structure includes a high-k dielectric layer adjacent the second channel region, and a metal layer.
538 Citations
19 Claims
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1. A device comprising:
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a substrate having a first strained channel region and a second strained channel region therein, the second channel region being strained in a different manner than the first channel region; a first gate structure including; a dielectric layer disposed at least partly over the first channel region, the dielectric layer including an interfacial layer physically in contact with the first channel region; a barrier layer disposed at least partly over the first channel region and physically in contact with the dielectric layer; a first conductive layer disposed over the barrier layer, and having a characteristic with a first value; a strain-inducing conductive layer disposed over the first conductive layer, and having the characteristic with a second value, wherein the second value is different from the first value; and a second conductive layer disposed over the strain-inducing conductive layer, and having the characteristic with the first value; and a second gate structure including; a high-k dielectric layer disposed at least partly over the second channel region; a U-shaped work function metal layer disposed over the high-k dielectric layer, the U-shaped work function metal layer forming an opening having opposing surfaces therein; and a metal fill layer disposed at least partially within the opening such that the metal fill layer is in physical contact with the opposing surfaces. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device comprising:
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a substrate; first and second projections extending upwardly from the substrate, the first projection having a tensile-strained first channel region therein and the second projection having a compression-strained second channel region therein; and first and second gate structures engaging the first and second projections adjacent to the first and second channel regions, respectively; wherein the first gate structure includes; a dielectric layer adjacent the first channel region; a first conductive layer disposed over the dielectric layer; a strain-inducing conductive layer disposed over the first conductive layer; and a second conductive layer disposed over the strain-inducing conductive layer; and wherein the second gate structure includes; a high-k dielectric layer adjacent the second channel region; and a metal layer disposed over the high-k dielectric layer. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A device comprising:
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a substrate; a first fin-like field effect transistor (FinFET) disposed on the substrate, the first FinFET including; a first strained channel region; a first dielectric layer disposed at least partly over the first strained channel region, the first dielectric layer including an interfacial layer physically in contact with the first strained channel region; a barrier layer disposed at least partly over the first strained channel region and physically in contact with the first dielectric layer; a first polysilicon layer disposed at least partly over the first strained channel region and physically in contact with the barrier layer; a strain-inducing layer disposed at least above the first strained channel region and imparting at least a portion of the strain in the first strained channel region; and a second polysilicon layer disposed at least partly over the first strained channel region and physically in contact with the strain-inducing layer; and a second FinFET disposed on the substrate, the second FinFET including; a second strained channel region, the second strained channel region being strained in a different manner than the first strained channel region; a high-k second dielectric layer disposed at least above the second strained channel region; a U-shaped work function metal layer disposed over the high-k second dielectric layer, the U-shaped work function metal layer forming an opening having opposing surfaces therein; and a metal fill layer disposed at least partially within the opening such that the metal fill layer is in physical contact with the opposing surfaces. - View Dependent Claims (17, 18, 19)
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Specification