Dual metal gate finFETs with single or dual high-K gate dielectric
First Claim
1. A method of forming a semiconductor structure comprising:
- providing a first semiconductor fin and a second semiconductor fin on a substrate;
forming a first high-k gate dielectric layer surrounding and laterally abutting said first semiconductor fin;
forming a first high-k gate dielectric ring surrounding and laterally abutting said first semiconductor fin and another first high-k gate dielectric ring surrounding and laterally abutting said second semiconductor fin;
forming a first metal gate ring surrounding and laterally abutting said first high-k gate dielectric layer and forming another first metal gate ring surrounding and laterally abutting said another first high-k gate dielectric ring;
removing said another first high-k gate ring and said another first metal gate ring, while protecting said first high-k gate dielectric ring and said first metal gate ring with a block mask;
forming a second metal gate layer on said first semiconductor fin and said second semiconductor fin; and
forming a silicon containing layer directly on a portion of said second metal gate layer.
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Accused Products
Abstract
A first high-k gate dielectric layer and a first metal gate layer are formed on first and second semiconductor fins. A first metal gate ring is formed on the first semiconductor fin. In one embodiment, the first high-k gate dielectric layer remains on the second semiconductor fin. A second metal gate layer and a silicon containing layer are deposited and patterned to form gate electrodes. In another embodiment, a second high-k dielectric layer replaces the first high-k dielectric layer over the second semiconductor fin, followed by formation of a second metal gate layer. A first electrode comprising a first gate dielectric and a first metal gate is formed on the first semiconductor fin, while a second electrode comprising a second gate dielectric and a second metal gate is formed on the second semiconductor fin. Absence of high-k gate dielectric materials on a gate wiring prevents increase in parasitic resistance.
31 Citations
12 Claims
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1. A method of forming a semiconductor structure comprising:
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providing a first semiconductor fin and a second semiconductor fin on a substrate; forming a first high-k gate dielectric layer surrounding and laterally abutting said first semiconductor fin; forming a first high-k gate dielectric ring surrounding and laterally abutting said first semiconductor fin and another first high-k gate dielectric ring surrounding and laterally abutting said second semiconductor fin; forming a first metal gate ring surrounding and laterally abutting said first high-k gate dielectric layer and forming another first metal gate ring surrounding and laterally abutting said another first high-k gate dielectric ring; removing said another first high-k gate ring and said another first metal gate ring, while protecting said first high-k gate dielectric ring and said first metal gate ring with a block mask; forming a second metal gate layer on said first semiconductor fin and said second semiconductor fin; and forming a silicon containing layer directly on a portion of said second metal gate layer. - View Dependent Claims (2, 3, 4, 8, 9, 10, 11, 12)
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5. A method of forming a semiconductor structure comprising:
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providing a first semiconductor fin and a second semiconductor fin on a substrate; forming a first high-k gate dielectric layer surrounding and laterally abutting said first semiconductor fin; forming a first metal gate ring surrounding and laterally abutting said first high-k gate dielectric layer; forming a second metal gate layer on said first semiconductor fin and said second semiconductor fin; forming a silicon containing layer directly on a portion of said second metal gate layer; and forming a second high-k gate dielectric layer directly on said second semiconductor fin and directly on said first metal gate prior to said forming of said second metal gate layer, wherein said second metal gate layer is formed directly on said second high-k gate dielectric layer. - View Dependent Claims (6, 7)
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Specification