Advanced transistors with punch through suppression
First Claim
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1. A die, comprising:
- a substrate that is a single crystal of semiconductor material;
a first field effect transistor structure and a second field effect transistor structure, each supported by the substrate;
wherein the first field effect transistor structure has a first gate, a first source, a first drain, and a first plurality of distinct doped regions underlying the first gate and extending between the first source and the first drain, the first plurality of doped regions implanted to define a first dopant profile of p-type, the first dopant profile having a p-type peak dopant concentration at a first depth from the first gate, a first p-type intermediate dopant concentration at a second depth from the first gate, the first p-type intermediate dopant concentration being lower than the p-type peak dopant concentration;
wherein the first field effect transistor structure includes a first channel region formed by an undoped blanket epitaxial growth, the first channel region being directly on a first threshold voltage control region formed in the single crystal of the single semiconductor material, the first threshold voltage control region associated with the first intermediate dopant concentration,wherein the second field effect transistor structure has a second gate, a second source, a second drain, and a second plurality of distinct doped regions underlying the second gate and extending between the second source and the second drain, the second plurality of doped regions implanted to define a second dopant profile of n-type, the second dopant profile having a n-type peak dopant concentration at a third depth from the second gate, a first n-type intermediate dopant concentration at a fourth depth from the second gate, the first n-type intermediate dopant concentration being lower than the n-type peak dopant concentration;
wherein the second field effect transistor structure includes a second channel region commonly formed by the undoped blanket epitaxial growth, the second channel region being directly on a second threshold voltage control region formed in the single crystal of the single semiconductor material, the second threshold voltage control region associated with the first n-type intermediate dopant concentration.
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Abstract
An advanced transistor with punch through suppression includes a gate with length Lg, a well doped to have a first concentration of a dopant, and a screening region positioned under the gate and having a second concentration of dopant. The second concentration of dopant may be greater than 5×1018 dopant atoms per cm3. At least one punch through suppression region is disposed under the gate between the screening region and the well. The punch through suppression region has a third concentration of a dopant intermediate between the first concentration and the second concentration of dopant. A bias voltage may be applied to the well region to adjust a threshold voltage of the transistor.
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Citations
18 Claims
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1. A die, comprising:
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a substrate that is a single crystal of semiconductor material; a first field effect transistor structure and a second field effect transistor structure, each supported by the substrate; wherein the first field effect transistor structure has a first gate, a first source, a first drain, and a first plurality of distinct doped regions underlying the first gate and extending between the first source and the first drain, the first plurality of doped regions implanted to define a first dopant profile of p-type, the first dopant profile having a p-type peak dopant concentration at a first depth from the first gate, a first p-type intermediate dopant concentration at a second depth from the first gate, the first p-type intermediate dopant concentration being lower than the p-type peak dopant concentration; wherein the first field effect transistor structure includes a first channel region formed by an undoped blanket epitaxial growth, the first channel region being directly on a first threshold voltage control region formed in the single crystal of the single semiconductor material, the first threshold voltage control region associated with the first intermediate dopant concentration, wherein the second field effect transistor structure has a second gate, a second source, a second drain, and a second plurality of distinct doped regions underlying the second gate and extending between the second source and the second drain, the second plurality of doped regions implanted to define a second dopant profile of n-type, the second dopant profile having a n-type peak dopant concentration at a third depth from the second gate, a first n-type intermediate dopant concentration at a fourth depth from the second gate, the first n-type intermediate dopant concentration being lower than the n-type peak dopant concentration; wherein the second field effect transistor structure includes a second channel region commonly formed by the undoped blanket epitaxial growth, the second channel region being directly on a second threshold voltage control region formed in the single crystal of the single semiconductor material, the second threshold voltage control region associated with the first n-type intermediate dopant concentration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification