Patent ID: 11955379
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method, comprising:
forming a titanium nitride layer over a bottom of a trench of a semiconductor device and over a sidewall of the trench;
modifying a phase composition of the titanium nitride layer using a plasma, wherein modifying the phase composition of the titanium nitride layer comprises:
causing the phase composition of the titanium nitride layer to transition from being equally composed of a (111) phase and a (200) phase, or from being composed of less of the (111) phase than the (200) phase, to being composed of greater of the (111) phase than the (200) phase,
wherein the (111) phase of the titanium nitride layer being greater than the (200) phase of the titanium nitride layer promotes adhesion between the titanium nitride layer and a metal plug; and

forming the metal plug in the trench after modifying the phase composition of the titanium nitride layer.