Patent ID: 6319807
Filing Date: 2001-11-20
Classification: H01L

Abstract:
A method for forming a semiconductor device, comprising:providing a semiconductor substrate;forming a first oxide layer on said semiconductor substrate;forming a dummy gate on said semiconductor substrate;implanting first ion said semiconductor substrate using said dummy gate as a first mask to form a lightly doped drain region in said semiconductor substrate;forming a first spacer on sidewall of said dummy gate;implanting second ion said semiconductor substrate using said dummy gate and said first spacer as a second mask to form a source/drain region in said semiconductor substrate;forming a first silicide layer on said source/drain region;forming a dielectric layer over said semiconductor substrate, and a top surface of said dummy gate is exposed;forming a trench by means of removing said dummy gate;forming an antipunch-through region under said trench of said semiconductor substrate;forming a second spacer in inner sidewall of said trench wherein said second spacer comprises a nitride layer;removing said first oxide layer in said trench;forming a second oxide layer in said trench;forming a gate by means of depositing a conductive layer in said trench; andforming a second silicide layer on said gate.