Optimized Compressive SiGe Channel PMOS Transistor with Engineered Ge Profile and Optimized Silicon Cap Layer

摘要

A semiconductor process and apparatus includes forming PMOS transistors (72) with enhanced hole mobility in the channel region by epitaxially growing a bi-axially stressed forward graded silicon germanium channel region layer (22) and a counter-doped silicon cap layer (23) prior to forming a PMOS gate structure (34) and associated source/drain regions (38, 40) in the channel region layer(s).