FinFET structures and methods of forming the same
First Claim
1. A structure comprising:
- a first transistor comprising;
a first channel region comprising alternating first semiconductor layers and second semiconductor layers above a substrate, each of the first semiconductor layers being separated from neighboring ones of the first semiconductor layers, each of the first semiconductor layers in the first channel region having a first sidewall and a second sidewall, the first sidewalls being aligned along a first plane extending perpendicularly to the substrate, the second sidewalls being aligned along a second plane extending perpendicularly to the substrate, sidewalls of the second semiconductor layers in the first channel region being between the first plane and the second plane;
a first source/drain region and a second source/drain region disposed on opposite sides of the first channel region, each of the first semiconductor layers extending from the first source/drain region to the second source/drain region;
a first dielectric layer contacting the first sidewalls and the second sidewalls of the first semiconductor layers, the first dielectric layer extending into a region between the first plane and the second plane; and
a first gate electrode over the first dielectric layer; and
a second transistor comprising;
a second channel region comprising the alternating first semiconductor layers and second semiconductor layers above the substrate, each of the second semiconductor layers in the second channel region having a third sidewall and a fourth sidewall, the third sidewalls being aligned along a third plane, the fourth sidewalls being aligned along a second plane, sidewalls of the first semiconductor layers in the second channel region being between the third plane and the fourth plane;
a third source/drain region and a fourth source/drain region disposed on opposite sides of the second channel region, each of the first semiconductor layers extending from the third source/drain region to the fourth source/drain region;
a second dielectric layer contacting the third sidewalls and the fourth sidewalls of the first semiconductor layers; and
a second gate electrode over the second dielectric layer.
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Abstract
FinFETs and methods of forming finFETs are described. According to some embodiments, a structure includes a channel region, first and second source/drain regions, a dielectric layer, and a gate electrode. The channel region includes semiconductor layers above a substrate. Each of the semiconductor layers is separated from neighboring ones of the semiconductor layers, and each of the semiconductor layers has first and second sidewalls. The first and second sidewalls are aligned along a first and second plane, respectively, extending perpendicularly to the substrate. The first and second source/drain regions are disposed on opposite sides of the channel region. The semiconductor layers extend from the first source/drain region to the second source/drain region. The dielectric layer contacts the first and second sidewalls of the semiconductor layers, and the dielectric layer extends into a region between the first plane and the second plane. The gate electrode is over the dielectric layer.
50 Citations
20 Claims
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1. A structure comprising:
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a first transistor comprising; a first channel region comprising alternating first semiconductor layers and second semiconductor layers above a substrate, each of the first semiconductor layers being separated from neighboring ones of the first semiconductor layers, each of the first semiconductor layers in the first channel region having a first sidewall and a second sidewall, the first sidewalls being aligned along a first plane extending perpendicularly to the substrate, the second sidewalls being aligned along a second plane extending perpendicularly to the substrate, sidewalls of the second semiconductor layers in the first channel region being between the first plane and the second plane; a first source/drain region and a second source/drain region disposed on opposite sides of the first channel region, each of the first semiconductor layers extending from the first source/drain region to the second source/drain region; a first dielectric layer contacting the first sidewalls and the second sidewalls of the first semiconductor layers, the first dielectric layer extending into a region between the first plane and the second plane; and a first gate electrode over the first dielectric layer; and a second transistor comprising; a second channel region comprising the alternating first semiconductor layers and second semiconductor layers above the substrate, each of the second semiconductor layers in the second channel region having a third sidewall and a fourth sidewall, the third sidewalls being aligned along a third plane, the fourth sidewalls being aligned along a second plane, sidewalls of the first semiconductor layers in the second channel region being between the third plane and the fourth plane; a third source/drain region and a fourth source/drain region disposed on opposite sides of the second channel region, each of the first semiconductor layers extending from the third source/drain region to the fourth source/drain region; a second dielectric layer contacting the third sidewalls and the fourth sidewalls of the first semiconductor layers; and a second gate electrode over the second dielectric layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A structure comprising:
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an n-type device comprising; a first channel region comprising a first superlattice, the first superlattice comprising alternating first layers and second layers, the first layers being a first semiconductor material, the second layers being a second semiconductor material, each of the first layers has a first sidewall and a second sidewall in the first channel region, the first sidewalls being aligned along a first plane, the second sidewalls being aligned along a second plane, side surfaces of the second layers being between the first plane and the second plane, a first source/drain region and a second source/drain region disposed on opposite sides of the first channel region, each of the first layers and the second layers extending from the first source/drain region to the second source/drain region, a first gate dielectric on the first superlattice, and a first gate electrode on the first gate dielectric; and a p-type device comprising; a second channel region comprising a second superlattice, the second superlattice comprising alternating third layers and fourth layers, the third layers being the first semiconductor material, the fourth layers being the second semiconductor material, the first semiconductor material and the second semiconductor material being ordered in the second superlattice a same order as in the first superlattice, each of the fourth layers has a third sidewall and a fourth sidewall in the second channel region, the third sidewalls being aligned along a third plane, the fourth sidewalls being aligned along a fourth plane, side surfaces of the third layers being between the third plane and the fourth plane, a third source/drain region and a fourth source/drain region disposed on opposite sides of the second channel region, each of the third layers and the fourth layers extending from the third source/drain region to the fourth source/drain region, a second gate dielectric on the second superlattice, and a second gate electrode on the second gate dielectric. - View Dependent Claims (12, 13, 14)
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15. A structure comprising:
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a first fin and a second fin extending upwards from a substrate, each of the first fin and the second fin comprising alternating first layers of a first material and second layers of a second material, sidewalls of the second layers in a first channel region of the first fin being recessed from sidewalls of the first layers, sidewalls of the first layers in a second channel region of the second fin being recessed from sidewalls of the first fin; a first gate dielectric over and extending continuously along sidewalls of the first layer and the second layer in the first channel region; a second gate dielectric over and extending continuously along sidewalls of the first layer and the second layer in the second channel region; a first conductive gate over the first gate dielectric; and a second conductive gate over the second gate dielectric. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification