Patent ID: 7315063

Claim:
A Complementary Metal Oxide Semiconductor (CMOS) transistor comprising: first and second conductivity type transistors on a semiconductor substrate; wherein the first conductivity type transistor comprises: a gate electrode structure on the semiconductor substrate; a first spacer on sidewalls of the gate electrode structure; a first conductivity type low-concentration source/drain region aligned with a sidewall of the gate electrode structure and formed in the semiconductor substrate; a first conductivity type high-concentration source/drain region aligned with a sidewall of the first spacer and formed in the semiconductor substrate in electrical contact with the first conductivity type low-concentration source/drain region; and, an enhancer on the gate electrode structure, first spacer, first conductivity type low-concentration source/drain region and first conductivity type high-concentration source/drain region; and, wherein the second conductivity type transistor comprises: a gate electrode structure on the semiconductor substrate; a first spacer on sidewalls of the gate electrode structure; a second spacer at least in part on the first spacer and formed from the same material used to form the enhancer; a second conductivity type low-concentration source/drain region aligned with a sidewall of the gate electrode structure and in the semiconductor substrate; an epitaxial layer formed to fill least in part a recess in the semiconductor substrate aligned with a sidewall of the second spacer; and, a second conductivity type high-concentration source/drain region in the epitaxial layer.