Semiconductor devices, FinFET devices and methods of forming the same
First Claim
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1. A semiconductor device, comprising:
- a substrate; and
a gate over the substrate,wherein the gate comprises a first portion, a second portion overlying the first portion and a third portion overlying the second portion, and a critical dimension of the second portion is smaller than each of a critical dimension of the first portion and a critical dimension of the third portion,wherein the critical dimension of the third portion is greater than the critical dimension of the first portion.
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Abstract
Semiconductor devices, FinFET devices and methods of forming the same are disclosed. One of the semiconductor devices includes a substrate and a gate over the substrate. Besides, the gate include a first portion, a second portion overlying the first portion and a third portion overlying the second portion, and the critical dimension of the second portion is smaller than each of the critical dimension of the first portion and the critical dimension of the third portion.
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17 Claims
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1. A semiconductor device, comprising:
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a substrate; and a gate over the substrate, wherein the gate comprises a first portion, a second portion overlying the first portion and a third portion overlying the second portion, and a critical dimension of the second portion is smaller than each of a critical dimension of the first portion and a critical dimension of the third portion, wherein the critical dimension of the third portion is greater than the critical dimension of the first portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A FinFET device, comprising:
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a substrate having at least one fin; a gate disposed across the at least one fin and having a narrow-middle profile that is narrow in a middle portion thereof, wherein the middle portion of the gate is no higher than half of a height of the gate, wherein the gate further has a top portion and a bottom portion that are wider than the middle portion, and a critical dimension of the top portion is greater than a critical dimension of the bottom portion. - View Dependent Claims (10, 11, 12)
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13. A method of forming a FinFET device, comprising:
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providing a substrate with at least one fin; forming a dummy layer on the substrate covering the at least one fin; forming a mask layer on the dummy layer; performing at least one main etching step and at least one lateral etching step to the dummy layer by using the mask layer as an etch mask, so as to form a dummy gate with a narrow-middle profile and a substantially smooth sidewall contour; forming source/drain regions at two sides of the dummy gate; and replacing the dummy gate with a gate, wherein the gate comprises a bottom portion, a middle portion and a top portion, wherein a critical dimension of the middle portion is smaller than each of a critical dimension of the bottom portion and a critical dimension of the top portion, and the critical dimension of the top portion is greater than the critical dimension of the bottom portion. - View Dependent Claims (14, 15, 16, 17)
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Specification