Fin field effect transistor (FinFET) device structure and method for forming the same
First Claim
Patent Images
1. A method for forming a fin field effect transistor (FinFET) device structure, comprising:
- forming a fin structure extending away from an isolation region over a semiconductor substrate, the fin structure comprising a top surface facing away from the semiconductor substrate;
depositing a dummy material over the fin structure;
patterning the fin structure to form a dummy gate structure, the dummy gate structure comprising a vertical upper portion above the top surface and a notched lower portion below the top surface, the upper portion having a first width that is greater than a second width of the lower portion, the lower portion also having a third width that is less than the second width;
forming spacers adjacent to the dummy gate structure;
depositing an interlayer dielectric adjacent to the dummy gate structure; and
replacing the dummy gate structure with a gate dielectric and a gate electrode.
0 Assignments
0 Petitions
Accused Products
Abstract
A FinFET device structure and method for forming the same are provided. The fin field effect transistor (FinFET) device structure includes a fin structure formed over a substrate and a gate structure traversing over the fin structure. The gate structure includes a gate electrode layer which includes an upper portion above the fin structure and a lower portion below the fin structure. The upper portion has a top surface with a first width, the lower portion has a bottom surface with a second width, and the first width is greater than the second width.
24 Citations
20 Claims
-
1. A method for forming a fin field effect transistor (FinFET) device structure, comprising:
-
forming a fin structure extending away from an isolation region over a semiconductor substrate, the fin structure comprising a top surface facing away from the semiconductor substrate; depositing a dummy material over the fin structure; patterning the fin structure to form a dummy gate structure, the dummy gate structure comprising a vertical upper portion above the top surface and a notched lower portion below the top surface, the upper portion having a first width that is greater than a second width of the lower portion, the lower portion also having a third width that is less than the second width; forming spacers adjacent to the dummy gate structure; depositing an interlayer dielectric adjacent to the dummy gate structure; and replacing the dummy gate structure with a gate dielectric and a gate electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method for forming a fin field effect transistor (FinFET) device structure, comprising:
-
etching a dummy material over a semiconductor fin to form a dummy gate structure, the dummy gate structure having a first width located a first distance away from a semiconductor substrate, a second width located a second distance away from the semiconductor substrate, and a third width located a third distance away from the semiconductor substrate, the second distance being greater than the first distance and the second width being less than the first width, the third distance being greater than the second distance and the third width being greater than the second width; forming dielectric materials around the dummy gate structure; planarizing the dielectric materials to expose the dummy gate structure; and removing the dummy gate structure. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A method for forming a fin field effect transistor (FinFET) device structure, comprising:
-
forming a spacer adjacent to a dummy gate structure over a semiconductor fin, wherein the forming the spacer forms a first vertical portion, a first angled portion, and a first horizontal portion extending between the first vertical portion and the first angled portion, the dummy gate structure having a first width located a first distance away from a semiconductor substrate, a second width located a second distance away from the semiconductor substrate, and a third width located a third distance away from the semiconductor substrate, the second distance being greater than the first distance and the second width being less than the first width, the third distance being greater than the second distance and the third width being greater than the second width; depositing an interlayer dielectric around the spacer and the dummy gate structure; removing the dummy gate structure to form an opening, the opening having the spacer as a sidewall; and depositing a gate electrode within the opening. - View Dependent Claims (16, 17, 18, 19, 20)
-
Specification