Patent ID: 11923200
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A method of making a semiconductor device, the method comprising:
forming a gate structure over a substrate;
etching the substrate to define a recess in the substrate;
depositing a first silicon-containing material structure in the recess, wherein depositing the first silicon-containing material structure comprises:
depositing a first layer having an uppermost surface below a top surface of the substrate and a bottommost surface in direct contact with the substrate;
depositing a second layer over the first layer, wherein at least a portion of the second layer is below the top surface of the substrate;
depositing a third layer over the second layer, wherein an entirety of the third layer is above the top surface of the substrate, a first region of the third layer is thinner than a second region of the third layer, thickness is measured in a direction perpendicular to the top surface of the substrate, and a width, measured perpendicular to the thickness, of the third layer is equal to a width of the first layer.