Patent ID: 11961912
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Measurement (Instruments)
Classification: CPC H  A  G | IPC A  G  H

Claim 15:
16. A semiconductor structure, comprising:
a silicon substrate, a top surface of the silicon substrate comprising a (100) plane;
an isolation feature disposed over the silicon substrate;
a first base fin and a second base fin rising from the silicon substrate and extending through the isolation feature;
a first transition epitaxial feature disposed on the first base fin;
a second transition epitaxial feature disposed on the second base fin;
a first bar-like epitaxial feature disposed on the first transition epitaxial feature;
a second bar-like epitaxial feature disposed on the second transition epitaxial feature; and
a conformal epitaxial layer disposed on the first bar-like epitaxial feature and the second bar-like epitaxial feature,
wherein the first transition epitaxial feature and the second transition epitaxial feature comprise a first n-type dopant concentration,
wherein the first bar-like epitaxial feature and the second bar-like epitaxial feature comprise a second n-type dopant concentration
wherein the conformal epitaxial layer comprise a third n-type dopant concentration,
wherein the third n-type dopant concentration is greater than the second n-type dopant concentration and the second n-type dopant concentration is greater than the first n-type dopant concentration.