Gate feature in FinFET device
First Claim
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1. A semiconductor device, comprising:
- a fin structure, disposed on a substrate, that horizontally extends along a direction; and
a gate feature that traverses the fin structure to overlay a central portion of the fin structure and further extends along the fin structure to overlay opposite side portions of the fin structure that are located in respective undercuts formed in respective portions of a dielectric layer located adjacent to opposite sidewalls of the gate feature, wherein the undercuts extend away from respective sidewalls of the gate feature and away from the central portion of the fin structure.
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Abstract
A semiconductor device includes a fin structure, disposed on a substrate, that horizontally extends along a direction; and a gate feature comprising a gate dielectric layer and at least a first metal gate layer overlaying the gate dielectric layer, wherein the gate dielectric layer and the first metal gate layer traverse the fin structure to overlay a central portion of the fin structure and further extend along the direction to overlay at least a side portion of the fin structure that is located outside a vertical projection of a sidewall of the gate feature.
8 Citations
19 Claims
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1. A semiconductor device, comprising:
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a fin structure, disposed on a substrate, that horizontally extends along a direction; and a gate feature that traverses the fin structure to overlay a central portion of the fin structure and further extends along the fin structure to overlay opposite side portions of the fin structure that are located in respective undercuts formed in respective portions of a dielectric layer located adjacent to opposite sidewalls of the gate feature, wherein the undercuts extend away from respective sidewalls of the gate feature and away from the central portion of the fin structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A semiconductor device, comprising:
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a fin structure, disposed on a substrate, that horizontally extends along a direction; and a gate feature comprising a gate dielectric layer and at least a first metal gate layer overlaying the gate dielectric layer, wherein the gate dielectric layer and the first metal gate layer traverse the fin structure to overlay a central portion of the fin structure and further extend along the fin structure to overlay opposite side portions of the fin structure that are located in respective undercuts formed in respective portions of a dielectric layer located adjacent to opposite sidewalls of the gate feature, wherein the undercuts extend away from respective sidewalls of the gate feature and away from the central portion of the fin structure. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A semiconductor device, comprising:
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a fin structure, disposed on a substrate, that horizontally extends along a direction; a gate feature that traverses the fin structure to overlay a central portion of the fin structure and further extends along the fin structure to overlay opposite side portions of the fin structure that are located in respective undercuts formed in respective portions of a dielectric layer located adjacent to opposite sidewalls of the gate feature, wherein the undercuts extend away from respective sidewalls of the gate feature and away from the central portion of the fin structure; a pair of source/drain features, along the fin structure, that are disposed at respective sides of the gate feature; and an oxide layer disposed between the fin structure and the gate feature. - View Dependent Claims (18, 19)
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Specification