Patent ID: 11955483
Assignee: SEMICONDUCTOR MANUFACTURING INTERNATIONAL (BEIJING) CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A fabrication method of a semiconductor device, comprising:
providing a base substrate, the base substrate including a substrate and a plurality of fins on the substrate, and the plurality of fins including a sparse region and a dense region;
forming a gate structure disposed on the substrate and crosses the plurality of fins, wherein the gate structure includes a first portion in a first region and a second portion in a second region, a length of the first portion of the gate structure in the first region is larger than a length of the second portion of the gate structure in the second region, the length of the first portion of the gate structure is a distance of the first portion of the gate structure across corresponding adjacent fins of the plurality of fins along a direction perpendicular to an extending direction of the plurality of fins, the length of the second portion of the gate structure is a distance of the second portion of the gate structure across corresponding adjacent fins of the plurality of fins along the direction perpendicular to the extending direction of the plurality of fins, the first portion of the gate structure in the first region is located between the plurality of fins in the sparse region, and the second portion of the gate structure in the second region is located between the plurality of fins in the dense region;
forming a sacrificial layer on the gate structure;
etching the sacrificial layer and the first portion of the gate structure in the first region under the sacrificial layer until exposing a surface of the base substrate, thereby forming a first opening in the first portion of the gate structure in the first region and in the sacrificial layer;
forming a separation section in the first opening to fill up the first opening, wherein a top surface of the separation section is higher than a top surface of the gate structure, and a width of the entire separation section along the direction perpendicular to the extending direction of the plurality of fins is uniform;
removing the sacrificial layer;
forming a dielectric layer on the top surface of the gate structure, on a portion of sidewalls of the separation section, and on the top surface of the separation section; and
forming a metal layer in the dielectric layer, a first bottom surface of the metal layer being in contact with the top surface of the gate structure at a side of the separation section, and a second bottom surface of the metal layer being in contact with the top surface of the separation section.