Manufacturing method for metal gate using ion implantation
First Claim
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1. A manufacturing method for a metal gate comprising:
- providing a substrate having at least a semiconductor device with a conductivity type formed thereon, wherein the semiconductor device further comprises at least a high-k gate dielectric layer, a bottom barrier layer, and an etch stop layer;
forming a gate trench in the semiconductor device, and the etch stop layer is exposed in a bottom of the gate trench;
forming a work function metal layer having the conductivity type and an intrinsic work function corresponding to the conductivity type in the gate trench; and
performing an ion implantation to adjust the intrinsic work function of the work function metal layer to a target work function.
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Abstract
A manufacturing method for a metal gate includes providing a substrate having at least a semiconductor device with a conductivity type formed thereon, forming a gate trench in the semiconductor device, forming a work function metal layer having the conductivity type and an intrinsic work function corresponding to the conductivity type in the gate trench, and performing an ion implantation to adjust the intrinsic work function of the work function metal layer to a target work function.
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Citations
35 Claims
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1. A manufacturing method for a metal gate comprising:
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providing a substrate having at least a semiconductor device with a conductivity type formed thereon, wherein the semiconductor device further comprises at least a high-k gate dielectric layer, a bottom barrier layer, and an etch stop layer; forming a gate trench in the semiconductor device, and the etch stop layer is exposed in a bottom of the gate trench; forming a work function metal layer having the conductivity type and an intrinsic work function corresponding to the conductivity type in the gate trench; and performing an ion implantation to adjust the intrinsic work function of the work function metal layer to a target work function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A manufacturing method for metal gates comprising:
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providing a substrate having at least a first semiconductor device and a second semiconductor device formed thereon, the first semiconductor device having a first conductivity type, the second semiconductor device having a second conductivity type, and the first conductivity type and the second conductivity type being complementary; forming a first gate trench and a second gate trench respectively in the first semiconductor device and the second semiconductor device; forming a first work function metal layer in the first gate trench, the first work function metal layer having the first conductivity type and a first intrinsic work function corresponding to the first conductivity type; performing a first ion implantation to adjust the first intrinsic work function to a first target work function; removing a portion of the first work function metal layer to expose a bottom of the second gate trench; forming a second work function metal layer in the second gate trench, the second work function metal layer having the second conductivity type and a second intrinsic work function corresponding to the second conductivity type; and performing a second ion implantation to adjust the second intrinsic work function to a second target work function. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification