A method (100) of forming a transistor includes forming a gate structure
(106, 108) over a semiconductor body and forming recesses (112)
substantially aligned to the gate structure in the semiconductor body.
Silicon germanium is then epitaxially grown (114) in the recesses,
followed by forming sidewall spacers (118) over lateral edges of the gate
structure. The method continues by implanting source and drain regions in
the semiconductor body (120) after forming the sidewall spacers. The
silicon germanium formed in the recesses resides close to the transistor
channel and serves to provide a compressive stress to the channel,
thereby facilitating improved carrier mobility in PMOS type transistor
devices.