Method for manufacturing semiconductor structure with mask structure
First Claim
1. A method for forming a semiconductor structure, comprising:
- forming a dummy gate structure over a substrate;
forming a spacer on a lower portion of a sidewall of the dummy gate structure and exposing an upper portion of the sidewall of the dummy gate structure;
forming a source/drain region in the substrate;
forming a dielectric layer covering the upper portion of the sidewall of the dummy gate structure exposed by the spacer;
removing the dummy gate structure to form a tube-shaped trench;
removing a portion of the dielectric layer to form a cone-shaped trench over the tube-shaped trench;
forming a gate structure in a bottom portion of the tube-shaped trench;
forming a hard mask structure in the cone-shaped trench and an upper portion of the tube-shaped trench;
forming a contact over the source/drain structure, wherein the contact has an extending portion covering a top surface of the hard mask structure; and
polishing the contact to remove the extending portion of the contact,wherein an interface between the hard mask structure and the dielectric layer overlaps the spacer and the source/drain region.
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Accused Products
Abstract
Semiconductor structures and methods for forming the same are provided. The method includes forming a dummy gate structure and forming a spacer on a lower portion of a sidewall of the dummy gate structure and exposing an upper portion of the sidewall of the dummy gate structure. The method further includes forming a dielectric layer covering the upper portion of the sidewall of the dummy gate structure exposed by the spacer and removing the dummy gate structure to form a tube-shaped trench. The method further includes removing a portion of the dielectric layer to form a cone-shaped trench and forming a gate structure in a bottom portion of the tube-shaped trench. The method further includes forming a hard mask structure in the cone-shaped trench and an upper portion of the tube-shaped trench, and an interface between the hard mask structure and the dielectric layer overlaps the spacer.
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Citations
20 Claims
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1. A method for forming a semiconductor structure, comprising:
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forming a dummy gate structure over a substrate; forming a spacer on a lower portion of a sidewall of the dummy gate structure and exposing an upper portion of the sidewall of the dummy gate structure; forming a source/drain region in the substrate; forming a dielectric layer covering the upper portion of the sidewall of the dummy gate structure exposed by the spacer; removing the dummy gate structure to form a tube-shaped trench; removing a portion of the dielectric layer to form a cone-shaped trench over the tube-shaped trench; forming a gate structure in a bottom portion of the tube-shaped trench; forming a hard mask structure in the cone-shaped trench and an upper portion of the tube-shaped trench; forming a contact over the source/drain structure, wherein the contact has an extending portion covering a top surface of the hard mask structure; and polishing the contact to remove the extending portion of the contact, wherein an interface between the hard mask structure and the dielectric layer overlaps the spacer and the source/drain region. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for forming a semiconductor structure, comprising:
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forming a dummy gate structure over a substrate; forming a spacer on a sidewall of the dummy gate structure; forming a resist layer covering a lower portion of the spacer and exposing an upper portion of the spacer; removing the upper portion of the spacer exposed by the resist layer, thereby only a lower sidewall of the dummy gate structure is covered by the spacer; removing the resist layer; forming a dielectric layer on an upper sidewall of the dummy gate structure; removing the dummy gate structure to form a trench; removing a portion of the dielectric layer to form a slope sidewall; forming a gate structure in a bottom portion of the trench; and forming a hard mask structure over the gate structure, wherein the hard mask structure covers the slope sidewall of the dielectric layer. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for forming a semiconductor structure, comprising:
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forming a dummy gate structure over a substrate; forming a sealing layer on a lower portion of a sidewall of the dummy gate structure; forming a dielectric layer on an upper portion of the sidewall of the dummy gate structure; removing the dummy gate structure to form a trench having a substantially straight sidewall formed of a sidewall of the sealing layer and a sidewall of the dielectric layer; etching the dielectric layer to form a slope sidewall, thereby forming a funnel shaped trench by the slope sidewall of the dielectric layer and the sidewall of the sealing layer; forming a gate structure in the funnel shaped trench; and forming a hard mask structure in the funnel shaped trench, wherein the hard mask structure is in direct contact with the sidewall of the sealing layer and the slope sidewall of the dielectric layer. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification