Patent ID: 6156598
Filing Date: 2000-12-05
Classification: H01L

Abstract:
A method for forming a lightly doped source and drain structure and source and drain regions using an L-shaped spacer, comprising the steps of:a. providing a semiconductor structure having a gate structure thereon;b. forming an L-shaped dielectric spacer; said L-shaped dielectric spacer having a horizontal leg with a thickness of between about 100 Angstroms and 500 Angstroms with a 3-sigma variability of less than 20 Angstroms; andc. implanting impurity ions into the surface of said semiconductor structure; whereby lightly doped source and drain extensions are formed by ions implanted through said horizontal leg of said L-shaped spacer, and source and drain regions are formed by ions implanted into the surface of said semiconductor structure not covered by said L-shaped spacer.