Strained-silicon MOSFETs of low leakage current and high breakdown voltage for analog applications

Strained-silicon MOSFETs of both high breakdown voltage and low leakage current were fabricated by employing a thick strained-silicon layer. It is demonstrated that proper control of junction depth can drastically reduce leakage current although misfit dislocations exist at the strained-silicon/SiGe interface, and that breakdown voltage of strained-silicon MOSFETs kept the same high value as silicon MOSFETs even at elevated temperatures. RF performances such as f/sub T/, noise, and FR-power-amplifier efficiency were improved by this technology.