FinFET devices with dummy fins having multiple dielectric layers
First Claim
1. A semiconductor device, comprising:
- a substrate;
semiconductor fins over the substrate and oriented lengthwise along a first direction;
first multi-dielectric-layer (MDL) fins and second MDL fins over the substrate and oriented lengthwise along the first direction, wherein the first and the second MDL fins are intermixed with the semiconductor fins, wherein each of the first MDL fins and the second MDL fins includes an outer dielectric layer and an inner dielectric layer, wherein the outer dielectric layer and the inner dielectric layer have different dielectric materials; and
gate structures oriented lengthwise along a second direction generally perpendicular to the first direction, wherein the gate structures are spaced from each other along the first direction, and are separated by the first MDL fins along the second direction, wherein the gate structures engage sidewalls and a top surface of each of the semiconductor fins and sidewalls and a top surface of each of the second MDL fins, wherein the top surface of each of the second MDL faces away from the substrate.
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Abstract
A semiconductor device includes a substrate; semiconductor fins over the substrate and oriented lengthwise along a first direction; first multi-dielectric-layer (MDL) fins and second MDL fins over the substrate and oriented lengthwise along the first direction, wherein the first and the second MDL fins are intermixed with the semiconductor fins, wherein each of the first MDL fins and the second MDL fins includes an outer dielectric layer and an inner dielectric layer, wherein the outer dielectric layer and the inner dielectric layer have different dielectric materials; and gate structures oriented lengthwise along a second direction generally perpendicular to the first direction, wherein the gate structures are spaced from each other along the first direction, and are separated by the first MDL fins along the second direction, wherein the gate structures engage the semiconductor fins and the second MDL fins.
18 Citations
20 Claims
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1. A semiconductor device, comprising:
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a substrate; semiconductor fins over the substrate and oriented lengthwise along a first direction; first multi-dielectric-layer (MDL) fins and second MDL fins over the substrate and oriented lengthwise along the first direction, wherein the first and the second MDL fins are intermixed with the semiconductor fins, wherein each of the first MDL fins and the second MDL fins includes an outer dielectric layer and an inner dielectric layer, wherein the outer dielectric layer and the inner dielectric layer have different dielectric materials; and gate structures oriented lengthwise along a second direction generally perpendicular to the first direction, wherein the gate structures are spaced from each other along the first direction, and are separated by the first MDL fins along the second direction, wherein the gate structures engage sidewalls and a top surface of each of the semiconductor fins and sidewalls and a top surface of each of the second MDL fins, wherein the top surface of each of the second MDL faces away from the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A semiconductor device, comprising:
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a substrate; semiconductor fins over the substrate and oriented lengthwise along a first direction, wherein some of the semiconductor fins are of N-conductivity type, and some of the semiconductor fins are of P-conductivity type; first multi-dielectric-layer (MDL) fins and second MDL fins over the substrate and oriented lengthwise along the first direction, wherein each of the first MDL fins is positioned between two of the semiconductor fins that are of a same conductivity type, and each of the second MDL fins is positioned between two of the semiconductor fins that are of opposite conductivity types, wherein each of the first MDL fins and the second MDL fins includes an outer dielectric layer and an inner dielectric layer, wherein the outer dielectric layer includes a first dielectric material, and the inner dielectric layer includes a second dielectric material that has a different dielectric constant than the first dielectric material; and gate structures oriented lengthwise along a second direction generally perpendicular to the first direction, wherein the gate structures are spaced from each other along the first direction, and are separated by the first MDL fins along the second direction, wherein the gate structures engage the semiconductor fins and the second MDL fins. - View Dependent Claims (15, 16, 17, 18)
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19. A semiconductor device, comprising:
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a substrate; CMOS cells formed over the substrate, wherein each CMOS cell includes an N-conductivity type semiconductor fin and a P-conductivity type semiconductor fin oriented lengthwise along a first direction and further includes a first multi-dielectric-layer (MDL) fin oriented lengthwise along the first direction and positioned between the N-conductivity type and the P-conductivity type semiconductor fins, wherein each CMOS cell further includes a gate structure engaging the N-conductivity type and the P-conductivity type semiconductor fins and the first MDL fin; and second MDL fins over the substrate, oriented lengthwise along the first direction, and positioned between the CMOS cells, wherein each of the first MDL fins and the second MDL fins includes an outer dielectric layer and an inner dielectric layer, wherein the outer dielectric layer includes a first dielectric material, and the inner dielectric layer includes a second dielectric material that has a different dielectric constant than the first dielectric material. - View Dependent Claims (20)
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Specification