Patent ID: 11894376
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of fabricating an integrated circuit device, the method comprising:
forming an insulating structure on an active region, the insulating structure defining a plurality of gate spaces;
forming a gate stack structure in a first gate space of the plurality of gate spaces, the gate stack structure comprising a first conductive metal nitride layer and having a first effective work function; and
forming an isolation stack structure in a second gate space of the plurality of gate spaces that is adjacent the first gate space, the isolation stack structure comprising a second conductive metal nitride layer and having a second effective work function that is different than the first effective work function, the second conductive metal nitride layer comprising a same metal nitride as a metal nitride comprised in the first conductive metal nitride layer and having a different thickness than the first conductive metal nitride layer;
wherein forming the isolation stack structure comprises:
forming an interfacial layer on the active region;
forming a gate insulating layer on the interfacial layer;
forming a La-containing layer on the gate insulating layer; and
forming the second conductive metal nitride layer on the La-containing layer.