Patent ID: 11894443
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A method of making a semiconductor device comprising:
depositing a TiN layer over a substrate;
doping a first portion of the TiN layer using an oxygen-containing plasma treatment;
doping a second portion of the TiN layer using a nitrogen-containing plasma treatment, wherein the second portion of the TiN layer directly contacts the first portion of the TiN layer;
forming a first metal gate electrode over the first portion of the TiN layer; and
forming a second metal gate electrode over the second portion of the TiN layer, wherein the second metal gate electrode directly contacts the first metal gate electrode, a first sidewall of the second metal gate electrode is substantially perpendicular to a top surface of the substrate, and a second sidewall of the second metal gate electrode is curved.