Semiconductor structure with multi spacer
First Claim
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1. A semiconductor structure, comprising:
- a fin structure formed over a substrate;
a gate structure formed across the fin structure;
a bottom spacer formed on a lower part of a sidewall of the gate structure;
an upper spacer formed on an upper part of the sidewall of the gate structure, wherein the upper spacer comprises a first air gap formed in a dielectric material; and
a second air gap located adjacent to the upper spacer and separating from the bottom spacer, wherein a bottommost portion of the second air gap is at a position higher than a bottom surface of the gate structure.
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Abstract
A semiconductor structure and a method for forming the same are provided. The semiconductor structure includes a fin structure formed over a substrate and a gate structure formed across the fin structure. The semiconductor structure further includes a bottom spacer formed on a lower part of a sidewall of the gate structure and an upper spacer formed on an upper part of the sidewall of the gate structure. In addition, the upper spacer includes an air gap formed in a dielectric material.
31 Citations
20 Claims
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1. A semiconductor structure, comprising:
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a fin structure formed over a substrate; a gate structure formed across the fin structure; a bottom spacer formed on a lower part of a sidewall of the gate structure; an upper spacer formed on an upper part of the sidewall of the gate structure, wherein the upper spacer comprises a first air gap formed in a dielectric material; and a second air gap located adjacent to the upper spacer and separating from the bottom spacer, wherein a bottommost portion of the second air gap is at a position higher than a bottom surface of the gate structure. - View Dependent Claims (2, 3, 4, 5, 6, 15, 19, 20)
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7. A semiconductor structure, comprising:
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a fin structure formed over a substrate; a gate structure formed across the fin structure; a bottom spacer formed on a lower part of a sidewall of the gate structure; a source/drain structure forming in the fin structure; a bottom interlayer dielectric layer formed around the source/drain structure; a spacer layer formed over the bottom interlayer dielectric layer, wherein the spacer layer and the bottom interlayer dielectric layer are made of different materials; an upper interlayer dielectric layer formed over the spacer layer, wherein the spacer layer and the upper interlayer dielectric layer are made of different materials; a contact formed through the upper interlayer dielectric layer over the source/drain structure; and an upper spacer formed between the contact and an upper part of the sidewall of the gate structure, wherein the upper spacer comprises an air gap formed in a dielectric material, and a top surface of the bottom interlayer dielectric layer is lower than a top surface of the bottom spacer. - View Dependent Claims (8, 9, 16, 17)
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10. A semiconductor structure, comprising:
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a gate structure over a substrate; a bottom spacer formed at a lower part of a sidewall of the gate structure; a bottom interlayer dielectric layer formed around the bottom spacer; a spacer layer formed over the bottom interlayer dielectric layer, wherein the spacer layer and the bottom spacer are made of different materials; an upper spacer formed over the bottom spacer, wherein the upper spacer comprises a first air gap formed in a dielectric material, and the upper spacer is thicker than the bottom spacer; and a second air gap formed over the spacer layer and exposing a portion of the upper spacer. - View Dependent Claims (11, 12, 13, 14, 18)
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Specification