Patent ID: 6376319
Filing Date: 2002-04-23
Classification: H01L

Abstract:
A method of forming a MOSFET device, on a semiconductor substrate, featuring source/drain extension regions, formed after formation of heavily doped source/drain regions, and after formation of a polycide gate structure, comprising the steps of:forming SEG silicon regions on second portions of said semiconductor substrate, with said SEG regions comprised with dopants, and with a first portion of said semiconductor substrate, exposed between the doped, SEG silicon regions; forming first insulator spacers on the sides of said doped, SEG silicon regions; growing a silicon dioxide gate insulator layer on the surface of said first portion of said semiconductor substrate, resulting in out diffusion of a portion of said dopants, from said doped, SEG silicon regions, forming said heavily doped source/drain regions directly underlying said doped, SEG silicon regions; forming a polysilicon gate structure on said silicon dioxide gate insulator layer; forming a metal silicide layer on the top surface of said doped, SEG silicon regions, and on the top surface of said polysilicon gate structure, creating said polycide gate structure; selectively removing said first insulator spacers, resulting in exposure of third portions of said semiconductor substrate, located between said doped, SEG silicon regions, and said polycide gate structure; forming said source/drain extension regions in said third portions of said semiconductor substrate; depositing an ILD layer, with a first portion of said ILD layer completely filling spaces between said doped, SEG silicon regions, and said polycide gate structure, and with a second portion of said ILD layer overlying said doped, SEG silicon regions, and overlying said polycide gate structure; forming contact holes in said second portion of said ILD layer, exposing a portion of the top surface of said doped, SEG silicon regions, and a portion of the top surface of said polycide gate structure; and forming metal structures in said contact holes.