Semiconductor device structure and methods of forming the same

Abstract

A semiconductor device structure, along with methods of forming such, are described. The semiconductor device structure includes a first fin structure disposed at a first device region and extending from a substrate along a first direction, wherein the first fin structure comprises a first recess formed in a top of the first fin structure, the first recess having a bottom and a sidewall extending upwardly from the bottom, wherein the sidewall has a tapering profile. The structure also includes a first source/drain feature in contact with the first fin structure, and a first gate structure disposed in the first recess, the first gate structure extending along a second direction perpendicular to the first direction, wherein the first gate structure has a first gate dielectric layer, and the first gate dielectric layer has a sidewall surface and a bottom surface in contact with the sidewall and the bottom of the first recess, respectively.