Patent ID: 11929398
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A FinFET structure, comprising:
a substrate;
a fin protruding from the substrate, comprising a first portion and a second portion below the first portion, wherein the first portion comprises a first dopant concentration of a dopant, and the second portion comprises a second dopant concentration of the dopant, the second dopant concentration is greater than the first dopant concentration;
a gate over the fin, wherein the gate is proximal to the first portion of the fin; and
an insulating layer over the substrate and proximal to the second portion of the fin, wherein at least a first portion of the insulating layer comprises a third dopant concentration of the dopant, the third dopant concentration is greater than the first dopant concentration, and a bottom surface of the first portion of the insulating layer is in direct contact with the substrate.