Patent ID: 11862468
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 17:
18. A method comprising:
forming a dummy dielectric on a first fin and a second fin, the first fin and the second fin extending away from a substrate in a first direction;
growing an epitaxial source/drain region in the first fin and the second fin, the epitaxial source/drain region adjacent the dummy dielectric;
removing the dummy dielectric to form a recess exposing the first fin and the second fin, a distance between the first fin and the second fin being constant along the first direction before the removing, the distance between the first fin and the second fin decreasing along the first direction after the removing;
depositing a gate dielectric layer in the recess;
depositing a sacrificial layer on the gate dielectric layer by exposing the gate dielectric layer to a self-limiting source precursor and a self-reacting source precursor, the self-limiting source precursor reacting to form an initial layer of a material of the sacrificial layer, the self-reacting source precursor reacting to form a main layer of the material of the sacrificial layer, wherein the self-reacting source precursor reacts with itself, wherein the self-limiting source precursor does not react with itself;
repairing defects in the gate dielectric layer while the sacrificial layer covers the gate dielectric layer;
removing the sacrificial layer from the gate dielectric layer; and
forming a gate electrode layer on the gate dielectric layer.