Patent ID: 6468867
Filing Date: 2002-10-22
Classification: H01L

Abstract:
A method for forming a partial salicide, said method comprises:providing a wafer, wherein said wafer comprises a substrate; forming a first oxide layer on said substrate; forming a nitride layer on said first oxide layer; forming a second oxide layer on said nitride layer; removing said partial first oxide layer, said partial nitride layer, and said partial second oxide layer to show said substrate in a first region of said wafer; forming a third oxide layer on said substrate which is in said first region; forming a silicon layer on said second oxide layer and said third oxide layer; removing said partial silicon layer to form a plural first gates and a plural first diffusion regions in said first region and to form a plural second gates and a plural second diffusion regions in a second region of said wafer, wherein said plural first diffusion regions are located on a side of said plural first gates and said plural second diffusion regions are located on a side of said plural second gates; forming a second nitride layer on said plural first diffusion regions, said plural first gates, said plural second diffusion regions, and said plural second gates; forming a mask layer on said second nitride layer which is in said second region and removing said second nitride layer which is on said plural first diffusion regions and said plural first gates; removing said mask layer; forming a third nitride layer on said plural first diffusion regions, said plural first gates, and said second nitride layer which is in said second region; removing said partial third nitride layer to form a spacer on a sidewall of said plural first gates, to show said silicon layer on said plural first gates and said plural second gates, and to show said third oxide layer over said plural first diffusion regions; forming a metal layer on said plural first gates, said plural first diffusion regions, and said plural second gates; proceeding a rapid thermal process to form a silicide layer on said plural first gates, said plural first diffusion regions, and said plural second gates; and removing said metal layer.