Integrating a first contact structure in a gate last process
First Claim
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1. A method comprising:
- providing a semiconductor substrate;
forming a transistor that includes a gate structure disposed over the semiconductor substrate, a source feature, and a drain feature, wherein the gate structure interposes the source feature and the drain feature and the gate structure includes a dummy gate;
forming a first dielectric layer over the semiconductor substrate and the transistor;
forming a first contact feature having a first width in the first dielectric layer, wherein the first contact feature is coupled to one of the source feature and the drain feature;
removing a portion of the first dielectric layer such that the dummy gate of the gate structure is exposed and a portion of the first dielectric layer remains;
replacing the dummy gate of the gate structure with a metal gate;
after replacing the dummy gate, forming a second dielectric layer over the remaining portion of the first dielectric layer; and
forming a second contact feature having a second width in the second dielectric layer, the second width being substantially the same as the first width, wherein the second contact feature is coupled to the first contact feature.
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Abstract
A method is provided that includes providing a substrate; forming a transistor in the substrate, the transistor having a dummy gate; forming a dielectric layer over the substrate and transistor; forming a contact feature in the dielectric layer; and after forming the contact feature, replacing the dummy gate of the transistor with a metal gate. An exemplary contact feature is a dual contact.
14 Citations
9 Claims
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1. A method comprising:
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providing a semiconductor substrate; forming a transistor that includes a gate structure disposed over the semiconductor substrate, a source feature, and a drain feature, wherein the gate structure interposes the source feature and the drain feature and the gate structure includes a dummy gate; forming a first dielectric layer over the semiconductor substrate and the transistor; forming a first contact feature having a first width in the first dielectric layer, wherein the first contact feature is coupled to one of the source feature and the drain feature; removing a portion of the first dielectric layer such that the dummy gate of the gate structure is exposed and a portion of the first dielectric layer remains; replacing the dummy gate of the gate structure with a metal gate; after replacing the dummy gate, forming a second dielectric layer over the remaining portion of the first dielectric layer; and forming a second contact feature having a second width in the second dielectric layer, the second width being substantially the same as the first width, wherein the second contact feature is coupled to the first contact feature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification