Patent ID: 9721887
Date: 2017-08-01
CPC Classifications: H01L

Claim:
1. A method comprising: forming a dielectric layer over a substrate; forming a trench in the dielectric layer; forming a first barrier layer in the trench, wherein the first barrier layer has a first portion disposed along sidewalls of the trench and a second portion disposed over a bottom of the trench, and wherein the first barrier layer is formed of a first conductive material; applying an isotropic plasma treatment to convert the first barrier layer into a modified barrier layer formed of a second conductive material different than that first conductive material, wherein the modified barrier layer has a first modified portion disposed along sidewalls of the trench and a second modified portion disposed over a bottom of the trench; applying an anisotropic plasma treatment to convert the second modified portion of the modified barrier layer into a second barrier layer, the second barrier layer being formed of the same first conductive material as the first barrier layer; removing the second barrier layer while the first modified portion of the modified barrier layer is disposed along sidewalls of the trench; and forming a conductive feature in the trench.