In ferroelectric MOSFETs, the reduced subthreshold swing (SS) below Boltzmann limit has attracted great attention due to its potential in decreasing power consumption. Here, through tuning the ferroelectric switching dynamics of BiFeO3 ferroelectric capacitor, the SS of a commercial MOSFET connected with the ferroelectric capacitor is significantly reduced to be zero over seven decades of the drain current. Interestingly, the SS can even be further tuned to be negative, i.e., the drain current increases with decreasing gate voltage. The intriguing strategy to control SS from positive to negative is promising for designing advanced MOSFETs with ultralow and tunable SS.
- Chuanchuan Liu
- Yuchen Wang
- Xiaoguang Li
