Patent ID: 7169675

Claim:
A method to form first and second regions and a carbon containing layer using implantation processes in a substrate comprising: a) forming a carbon containing layer in a substrate; said carbon containing layer has a carbon concentration between 5E18 and 1E20 atom/cc; b) implanting ions to form a first region and a first end-of-range region in the substrate; (1) at least a portion of said first end-of-range region is in said carbon containing layer, said first end-of-range region is at least at a depth between 1.0*Rp-first region and 1.5*Rp-first region; c) implanting ions to form a second region and a second end-of-range region in the substrate; (1) at least a portion of said second region end-of-range region is in said carbon containing layer; said carbon containing layer extends at least from the 1.0 * Rp of the first region to 1.5*Rp of the second region; step b and step c are two separate different implant steps.