Method to induce strain in 3-D microfabricated structures
First Claim
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1. A device, comprising:
- a substrate having a first portion and a second portion extending away from the first portion, the second portion having a first length in a first direction and a first width in a second direction orthogonal to the first direction;
a microfabricated structure on the substrate, the microfabricated structure having a fin including;
the second portion of the substrate;
a strain-inducing layer on the second portion of the substrate, the strain-inducing layer having a second length in the first direction and a second width in the second direction, the first length approximately equal to the second length and the first width approximately equal to the second width; and
a semiconductor layer on the strain-inducing layer.
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Abstract
Methods and structures for forming strained-channel finFETs are described. Fin structures for finFETs may be formed in two epitaxial layers that are grown over a bulk substrate. A first thin epitaxial layer may be cut and used to impart strain to an adjacent channel region of the finFET via elastic relaxation. The structures exhibit a preferred design range for increasing induced strain and uniformity of the strain over the fin height.
45 Citations
21 Claims
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1. A device, comprising:
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a substrate having a first portion and a second portion extending away from the first portion, the second portion having a first length in a first direction and a first width in a second direction orthogonal to the first direction; a microfabricated structure on the substrate, the microfabricated structure having a fin including; the second portion of the substrate; a strain-inducing layer on the second portion of the substrate, the strain-inducing layer having a second length in the first direction and a second width in the second direction, the first length approximately equal to the second length and the first width approximately equal to the second width; and a semiconductor layer on the strain-inducing layer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device, comprising:
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a substrate having a first portion with a first surface and a second portion with a second surface spaced apart from the first surface; and a semiconductor structure extending away from the second surface of the substrate, the semiconductor structure including; a strain-inducing layer having a first surface on the second surface of the substrate and a second surface; and a semiconductor layer having a first surface on the second surface of the strain-inducing layer and a second surface, wherein the second portion of the substrate has the same length and width as the strain-inducing layer and the semiconductor layer. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A device, comprising:
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a substrate having a raised portion; a fin on the raised portion of the substrate, the fin including; a first semiconductor layer on the raised portion of the substrate; and a second semiconductor layer that is strained on the first semiconductor layer; and a gate insulator contacting sidewalls of the first semiconductor layer and the second semiconductor layer. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A device, comprising:
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a substrate having a raised portion; a dielectric layer over the substrate and surrounding the raised portion; a fin on the raised portion of the substrate, the fin including; a first semiconductor layer on the raised portion of the substrate, wherein the first semiconductor layer is protruded above the dielectric layer; and a second semiconductor layer that is strained on the first semiconductor layer; and a gate structure adjacent to sidewalls of the first semiconductor layer and the second semiconductor layer. - View Dependent Claims (21)
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Specification