Patent ID: 11876019
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A semiconductor device comprising:
a first trench having a first depth and defining a fin;
a first source/drain region and a second source/drain region on the fin;
a second trench in the fin and between the first source/drain region and the second source/drain region, the second trench having a second depth that is different from the first depth;
a first device isolation layer in the first trench; and
a second device isolation layer in the second trench,
wherein the second device isolation layer consists of three isolation layers,
wherein the second device isolation layer includes a first isolation liner extending along a bottom of the second trench and a sidewall of the second trench, a second isolation liner on the first isolation liner and extending along the first isolation liner, and an upper isolation layer on the second isolation liner,
wherein the second isolation liner defines a liner recess, and
wherein the upper isolation layer is in the liner recess.