Abstract
The dc characteristics of Si1−x−yGexCy P-channel metal–oxide–semiconductor field-effect transistors (PMOSFETs) were evaluated between room temperature and 77 K and were compared to those of Si and Si1−xGex PMOSFETs. The low-field effective mobility in Si1−x−yGexCy devices is found to be higher than that of Si1−xGex (grown in the metastable regime) and Si devices at low gate bias and room temperature. However, with increasing transverse fields and with decreasing temperatures, Si1−x−yGexCy devices show degraded performance. The enhancement at low gate bias is attributed to the strain stabilization effect of C. This application of Si1−x−yGexCy in PMOSFETs demonstrates potential benefits in the use of C for strain stabilization of the binary alloy.
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