Patent ID: 11887985
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 15:
16. A method comprising:
forming a fin over a semiconductor substrate;
forming a gate stack on sidewalls and a top surface of the fin;
performing a first etching process to form a first recess and a second recess in the fin, the first recess and the second recess being on opposite sides of the gate stack;
after performing the first etching process, depositing a first dielectric layer on sidewalls of the gate stack, and depositing the first dielectric layer on sidewalls of the fin in the first recess and the second recess;
after depositing the first dielectric layer, performing a second etching process to extend the first recess and the second recess under the gate stack, wherein after performing the second etching process, a first portion of the fin is disposed between the first recess and the gate stack;
after performing the second etching process, performing a third etching process to further extend the first recess and the second recess in the fin; and
epitaxially growing a semiconductor material in the first recess and the second recess.