INTEGRATING A FIRST CONTACT STRUCTURE IN A GATE LAST PROCESS
First Claim
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1. A method for fabricating a semiconductor device, the method comprising:
- providing a semiconductor substrate;
forming a transistor having a dummy gate structure;
forming a first dielectric layer over the substrate including the transistor;
forming a first contact feature in the first dielectric layer;
removing a portion of the first dielectric layer to expose a portion of the dummy gate structure;
removing the dummy gate structure and replacing it with a metal gate;
forming a second dielectric layer over the first dielectric layer; and
forming a second contact feature and a metal barrier in the second dielectric layer, the second contact feature being coupled to the first contact feature via the metal barrier.
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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.
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Citations
20 Claims
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1. A method for fabricating a semiconductor device, the method comprising:
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providing a semiconductor substrate; forming a transistor having a dummy gate structure; forming a first dielectric layer over the substrate including the transistor; forming a first contact feature in the first dielectric layer; removing a portion of the first dielectric layer to expose a portion of the dummy gate structure; removing the dummy gate structure and replacing it with a metal gate; forming a second dielectric layer over the first dielectric layer; and forming a second contact feature and a metal barrier in the second dielectric layer, the second contact feature being coupled to the first contact feature via the metal barrier. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method comprising:
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providing a substrate; forming a transistor in the substrate, the transistor having a dummy gate; forming an inter-level dielectric (ILD) layer over the substrate and transistor; forming a contact feature in the ILD layer; and after forming the contact feature, replacing the dummy gate of the transistor with a metal gate. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method comprising:
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providing a semiconductor substrate having a first region and a second region; forming a transistor having a dummy gate in the first region of the semiconductor; forming an inter-level dielectric (ILD) layer over the semiconductor substrate and transistor; forming a contact feature in the ILD layer in the first region and a dummy contact feature in the ILD layer in the second region; and after forming the contact and dummy contact features, replacing the dummy gate of the transistor with a metal gate. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification