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On-state and off-state performance of strained-Si-SiGe n-channel MOSFETs have been investigated as a function of SiGe virtual substrate alloy composition. Performance gains in terms of on-state drain current and maximum transconductance of up to 220% are demonstrated for strained-Si-SiGe devices compared with Si controls. Device performance is found to peak using a virtual substrate composition of Si/sub 0.75/Ge/sub 0.25/. MOSFET fabrication used high thermal budget processing and good gate oxide quality has been maintained for virtual substrates having Ge compositions up to 30%. Off-state characteristics are found to be more sensitive to strain relaxation than on-state characteristics.
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Olsen et al. (2004) studied this question.
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