Abstract
The body effect in ultrathin body (silicon-on-insulator) SOI MOSFETs has been investigated by experiments and modeling. It is demonstrated for the first time that the adjustable threshold voltage range by substrate bias is enhanced due to the quantum confinement effect in ultrathin body SOI. The enhancement ratio of the adjustable threshold voltage range in a 4.3-nm-thick SOI MOSFET compared to 11.7-nm-thick one is around 10%. This indicates that ultrathin body MOSFETs are useful not only for suppressing the short channel effects, but also for suppressing the off-leak current in the variable threshold CMOS scheme.
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