MOS devices with strain buffer layer and methods of forming the same
First Claim
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1. A device comprising:
- a substrate;
insulation regions extending into the substrate;
a semiconductor fin higher than top surfaces of the insulation regions, wherein the semiconductor fin has a first lattice constant;
a semiconductor region having a second lattice constant different from the first lattice constant, wherein the semiconductor region comprises;
sidewall portions on opposite sides of the semiconductor fin; and
a top portion over the semiconductor fin; and
a strain buffer layer between and contacting the semiconductor fin and the semiconductor region, wherein the strain buffer layer comprises an oxide.
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Abstract
A device includes a substrate, insulation regions extending into the substrate, and a semiconductor fin higher than top surfaces of the insulation regions. The semiconductor fin has a first lattice constant. A semiconductor region includes sidewall portions on opposite sides of the semiconductor fin, and a top portion over the semiconductor fin. The semiconductor region has a second lattice constant different from the first lattice constant. A strain buffer layer is between and contacting the semiconductor fin and the semiconductor region. The strain buffer layer includes an oxide.
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Citations
20 Claims
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1. A device comprising:
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a substrate; insulation regions extending into the substrate; a semiconductor fin higher than top surfaces of the insulation regions, wherein the semiconductor fin has a first lattice constant; a semiconductor region having a second lattice constant different from the first lattice constant, wherein the semiconductor region comprises; sidewall portions on opposite sides of the semiconductor fin; and a top portion over the semiconductor fin; and a strain buffer layer between and contacting the semiconductor fin and the semiconductor region, wherein the strain buffer layer comprises an oxide. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device comprising:
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a first semiconductor region, wherein the first semiconductor region has a first lattice constant; a second semiconductor region over the first semiconductor region, wherein the second semiconductor region has a second lattice constant different from the first lattice constant; a strain buffer layer between and contacting the first semiconductor region and the second semiconductor region, wherein the strain buffer layer comprises an oxide of the first semiconductor region and an oxide of the second semiconductor region; a gate dielectric overlying the second semiconductor region; and a gate electrode overlying the first semiconductor region. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method comprising:
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performing an epitaxy to grow a first semiconductor region on a second semiconductor region, wherein the first semiconductor region has a first lattice constant different from a second lattice constant of the second semiconductor region; and performing an oxidation process to form an oxide in an interface region between the first semiconductor region and the second semiconductor region, wherein in the oxidation process, portions of the first semiconductor region and the second semiconductor region in an interface region between the first semiconductor region and the second semiconductor region are oxidized to form an oxide region, and wherein a portion of the first semiconductor region remains, and is separated from the second semiconductor region by the oxide region. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification