FINFET DEVICE AND FABRICATION METHOD THEREOF
First Claim
1. A fabrication method for a FinFET, comprising:
- providing a semiconductor substrate and fins on the semiconductor substrate, wherein each fin includes a first sidewall region and a second sidewall region above the first sidewall region;
forming an interlayer dielectric layer on the semiconductor substrate and on the fins, with openings in the interlayer dielectric layer to expose a portion of sidewalls and a portion of a top surface of each fin; and
forming a target work function layer on sidewalls and on a bottom of each opening, the target work function layer including a first target region covering the first sidewall region, a second target region covering the second sidewall region, and a third portion on the top surface of each fin, wherein;
the second target region and the third portion of the target work function layer is doped with modification ions; and
the first target region of the target work function layer has a first effective work function value, while the second target region and the third portion of the target work function layer has a second effective work function value greater than the first effective work function value.
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Abstract
A FinFET device and fabrication method thereof is provided. The method includes: providing a semiconductor substrate and fins. Each fin includes a first sidewall region and a second sidewall region. An interlayer dielectric layer is formed on the semiconductor substrate and on the fins, with openings. Then a target work function layer is formed on sidewalls and on a bottom of each opening. The target work function layer includes a first target region covering the first sidewall region, a second target region covering the second sidewall region, and a third portion on the top surface of each fin. The second target region and the third portion of the target work function layer is doped with modification ions; and has a second effective work function value greater than a first effective work function value of the first target region of the target work function layer.
1 Citation
20 Claims
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1. A fabrication method for a FinFET, comprising:
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providing a semiconductor substrate and fins on the semiconductor substrate, wherein each fin includes a first sidewall region and a second sidewall region above the first sidewall region; forming an interlayer dielectric layer on the semiconductor substrate and on the fins, with openings in the interlayer dielectric layer to expose a portion of sidewalls and a portion of a top surface of each fin; and forming a target work function layer on sidewalls and on a bottom of each opening, the target work function layer including a first target region covering the first sidewall region, a second target region covering the second sidewall region, and a third portion on the top surface of each fin, wherein; the second target region and the third portion of the target work function layer is doped with modification ions; and the first target region of the target work function layer has a first effective work function value, while the second target region and the third portion of the target work function layer has a second effective work function value greater than the first effective work function value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A FinFET device, comprising:
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a semiconductor substrate; fins on the semiconductor substrate, wherein each fin has a first sidewall region and a second sidewall region above the first sidewall region; an interlayer dielectric layer on the semiconductor substrate and on the fins, containing openings to expose a portion of the sidewalls and a portion of the top surface of each fin; and a target work function layer on sidewalls and a bottom of each opening. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification