High-mobility multiple-gate transistor with improved on-to-off current ratio
First Claim
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1. A multi-gate transistor comprising:
- a substrate;
a semiconductor fin over the substrate and comprising;
a central fin formed of a first semiconductor material; and
a semiconductor layer comprising a first portion and a second portion on opposite sidewalls of the central fin, wherein the semiconductor layer comprises a second semiconductor material different from the first semiconductor material;
a gate electrode wrapping around sidewalls of the semiconductor fin; and
a source region and a drain region on opposite ends of the semiconductor fin, wherein each of the central fin and the semiconductor layer extends from the source region to the drain region.
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Abstract
A multi-gate transistor includes a semiconductor fin over a substrate. The semiconductor fin includes a central fin formed of a first semiconductor material; and a semiconductor layer having a first portion and a second portion on opposite sidewalls of the central fin. The semiconductor layer includes a second semiconductor material different from the first semiconductor material. The multi-gate transistor further includes a gate electrode wrapping around sidewalls of the semiconductor fin; and a source region and a drain region on opposite ends of the semiconductor fin. Each of the central fin and the semiconductor layer extends from the source region to the drain region.
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Citations
20 Claims
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1. A multi-gate transistor comprising:
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a substrate; a semiconductor fin over the substrate and comprising; a central fin formed of a first semiconductor material; and a semiconductor layer comprising a first portion and a second portion on opposite sidewalls of the central fin, wherein the semiconductor layer comprises a second semiconductor material different from the first semiconductor material; a gate electrode wrapping around sidewalls of the semiconductor fin; and a source region and a drain region on opposite ends of the semiconductor fin, wherein each of the central fin and the semiconductor layer extends from the source region to the drain region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A multi-gate transistor comprising:
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a substrate; a semiconductor fin over the substrate and comprising; a central fin formed of a first semiconductor material; and a semiconductor layer comprising a first portion and a second portion on opposite sidewalls of, and adjoining, the central fin, wherein the semiconductor layer comprises a second semiconductor material different from the first semiconductor material, and wherein the central fin and the semiconductor layer form a quantum well; a gate dielectric comprising a first portion on an outer sidewall of the first portion of the semiconductor layer, and a second portion on an outer sidewall of the second portion of the semiconductor layer; a gate electrode over the gate dielectric; and a source region and a drain region on opposite ends of, and adjoining, the central fin and the semiconductor layer, wherein the source region and the drain region are n-type regions. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification