Methods are provided for fabricating a stress enhanced MOS circuit. One
method comprises the steps of depositing a stressed material overlying a
semiconductor substrate and patterning the stressed material to form a
stressed dummy gate electrode overlying a channel region in the
semiconductor substrate so that the stressed dummy gate induces a stress
in the channel region. Regions of the semiconductor substrate adjacent
the channel are processed to maintain the stress to the channel region
and the stressed dummy gate electrode is replaced with a permanent gate
electrode.