Method to induce strain in 3-D microfabricated structures
First Claim
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1. A device, comprising:
- a semiconductor substrate having a first surface and a second surface on a raised portion of the semiconductor substrate, the raised portion extending away from the first surface;
a first semiconductor layer on the raised portion of the semiconductor substrate;
a strained second semiconductor layer on the first semiconductor layer; and
a finFET transistor on the substrate, the finFET transistor including;
a fin formed from the first semiconductor layer and the strained second semiconductor layer; and
a strained channel formed in the strained second semiconductor layer in the fin.
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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.
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Citations
20 Claims
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1. A device, comprising:
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a semiconductor substrate having a first surface and a second surface on a raised portion of the semiconductor substrate, the raised portion extending away from the first surface; a first semiconductor layer on the raised portion of the semiconductor substrate; a strained second semiconductor layer on the first semiconductor layer; and a finFET transistor on the substrate, the finFET transistor including; a fin formed from the first semiconductor layer and the strained second semiconductor layer; and a strained channel formed in the strained second semiconductor layer in the fin. - View Dependent Claims (2, 3, 4, 5, 19)
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6. A device, comprising:
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a strained silicon substrate; a relaxed silicon germanium layer on the strained silicon substrate; a strained silicon layer on the relaxed silicon germanium layer; a transistor formed on the strained silicon substrate, the transistor including; a channel region formed in the strained silicon layer; and a gate adjacent to sidewalls of the strained silicon substrate, the relaxed silicon germanium layer, and the strained silicon layer. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A device, comprising:
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a substrate; a finFET transistor on the substrate, the finFET transistor including a fin structure, the fin structure including; a strained portion of the substrate having a first length and a first width; a strain-inducing layer on the strained portion of the substrate, the strain-inducing layer having the same length and width as the strained portion of the substrate; and a semiconductor layer on the strain-inducing layer, the semiconductor layer including a strained-channel. - View Dependent Claims (13, 14, 15, 16, 17, 18, 20)
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Specification