Patent ID: 9236263
Filing Date: 2016-01-12
CPC Classification: H01L

Claim Text:
1. A method for fabricating a semiconductor device, comprising: forming a silicon-containing layer; forming an undercut prevention layer over the silicon-containing layer; forming a diffusion barrier layer over the undercut prevention layer; forming a metal layer over the diffusion barrier layer; etching the metal layer and the diffusion barrier layer; and forming a conductive structure by etching the metal layer, the diffusion barrier layer, the undercut prevention layer and the silicon-containing layer, wherein the metal layer includes tungsten silicide, tungsten nitride, tungsten or a combination thereof, wherein the diffusion barrier layer includes tungsten silicide, tungsten nitride, tungsten silicon nitride or a combination thereof, wherein the forming of the undercut prevention laver comprises injecting chemical species for controlling an etch rate, wherein the injecting of the chemical species comprises implanting of carbon, and wherein the conductive structure comprises a gate electrode or bit line.