Metal gate semiconductor device
First Claim
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1. A device, comprising:
- a first gate structure of an NMOS device, the first gate structure including;
a first type of work function material;
a second type of work function material overlying the first type of work function material, wherein the second type of work function material includes oxygen; and
a fill layer overlying the second type of work function material; and
a second gate structure of a PMOS device, the second gate structure including;
the second type of work function material; and
the fill layer overlying the second type of work function material.
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Abstract
A semiconductor device including a first gate structure associated with a first type of transistor and a second gate structure of a second type of transistor. The first gate structure includes a capping layer, a first metal layer having a first type of work function on the capping layer, and a second metal layer having a second type of work function, overlying the first metal layer and a fill layer on the second metal layer. The second type of work function is different than the first type of work function. The second gate structure includes the gate dielectric and the second metal layer formed on the gate dielectric, and the fill layer on the second metal layer.
16 Citations
17 Claims
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1. A device, comprising:
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a first gate structure of an NMOS device, the first gate structure including; a first type of work function material; a second type of work function material overlying the first type of work function material, wherein the second type of work function material includes oxygen; and a fill layer overlying the second type of work function material; and a second gate structure of a PMOS device, the second gate structure including; the second type of work function material; and the fill layer overlying the second type of work function material. - View Dependent Claims (2, 3, 4, 5)
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6. A semiconductor device, comprising:
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a first gate structure associated with a NMOS transistor, wherein the first gate structure includes a gate dielectric, a capping layer, a first metal layer on the capping layer, and a second metal layer overlying the first metal layer, wherein the first metal layer is an n-type metal; and a second gate structure associated with a PMOS transistor, wherein the second gate structure includes the gate dielectric and the second metal layer formed directly on the gate dielectric. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A semiconductor device comprising:
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a first gate structure associated with a first type of transistor, wherein the first gate structure includes a capping layer, a first metal layer having a first type of work function on the capping layer, and a second metal layer having a second type of work function, overlying the first metal layer, wherein the second type of work function is different than the first type of work function, and a fill layer on the second metal layer; a second gate structure associated with a second type of transistor, wherein the portion of the second gate structure includes the gate dielectric and the second metal layer formed on the gate dielectric, and the fill layer on the second metal layer, wherein the second gate structure does not include the first metal layer; and an isolation region in a semiconductor substrate, the isolation region interposing the first and second gate structures. - View Dependent Claims (15, 16, 17)
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Specification