Patent ID: 6939770

Claim:
A method of fabricating a semiconductor device having a triple LDD (lateral diffused dopants) structure, comprising: forming a gate structure on a surface of a semiconductor substrate, wherein said gate structure includes a first vertical surface and a second vertical surface; forming a first spacer adjacent to said first vertical surface and a second spacer adjacent to said second vertical surface, wherein said first spacer has a first thickness and a second thickness that is greater than said first thickness and that abuts said first vertical surface, and wherein said second spacer has a third thickness and a fourth thickness that is greater than said third thickness and that abuts said second vertical surface, wherein said step of forming said first and second spacers comprises: depositing a first mask on said surface and said gate structure; depositing a second mask on said surface and said gate structure; performing a first plasma etch process to remove substantially said second mask; performing a second plasma etch process to remove substantially said first mask; and performing a third plasma etch process to remove completely said second mask such that a remaining portion of said first mask defines said first and second spacers; and performing a single implant process to form said triple LDD structure for a drain and a source of said semiconductor device in said semiconductor substrate.