Integrating a first contact structure in a gate last process
First Claim
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1. A semiconductor device, comprising:
- a semiconductor substrate;
a transistor formed in the substrate, the transistor having a gate stack including a metal gate and high-k gate dielectric;
a dual first contact formed on the substrate, the dual first contact including;
a first contact feature;
a second contact feature overlying the first contact feature; and
a metal barrier layer formed on sidewalls and bottom of the second contact feature, the metal barrier layer coupling the first contact feature to the second contact feature; and
a dummy contact plug formed in the substrate adjacent the transistor and substantially coplanar with the second contact feature.
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Abstract
A semiconductor device is provided which includes a semiconductor substrate, a transistor formed on the substrate, the transistor having a gate stack including a metal gate and high-k gate dielectric and a dual first contact formed on the substrate. The dual first contact includes a first contact feature, a second contact feature overlying the first contact feature, and a metal barrier formed on sidewalls and bottom of the second contact feature, the metal barrier layer coupling the first contact feature to the second contact feature.
33 Citations
20 Claims
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1. A semiconductor device, comprising:
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a semiconductor substrate; a transistor formed in the substrate, the transistor having a gate stack including a metal gate and high-k gate dielectric; a dual first contact formed on the substrate, the dual first contact including; a first contact feature; a second contact feature overlying the first contact feature; and a metal barrier layer formed on sidewalls and bottom of the second contact feature, the metal barrier layer coupling the first contact feature to the second contact feature; and a dummy contact plug formed in the substrate adjacent the transistor and substantially coplanar with the second contact feature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A semiconductor device, comprising:
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a semiconductor substrate having a first region and a second region, wherein the second region includes a pattern density that is substantially less than a pattern density of the first region; at least two transistors formed in the first region, the at least two transistors each having a metal gate and high-k gate dielectric; and a dual contact structure formed in the first region between the at least two transistors, the dual contact structure including; a first contact plug, the first contact plug having a surface that is co-planar with a surface of the metal gate; and a second contact plug coupled to the surface of the first contact plug; and a dummy contact plug disposed in the second region, the dummy contact plug being co-planar with the first contact plug. - View Dependent Claims (11, 12, 13, 14)
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15. A semiconductor device comprising:
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a semiconductor substrate; a transistor having a gate structure including a metal gate electrode and high-k gate dielectric disposed over the substrate; and a contact structure disposed over the substrate, the contact structure including; a first contact portion having a surface that is substantially co-planar with a surface of the metal gate electrode; a second contact portion overlying the first contact portion; a metal barrier layer disposed between the first contact portion and the second contact portion such that the metal barrier layer connects the first contact portion to the second contact portion and a dummy contact plug disposed in the substrate adjacent the transistor and substantially coplanar with the first contact. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification