Three-Dimensional Computational Analysis of Accumulated Body MOSFETs

Accumulated body approach for short- and narrow-channel (10-nm scale) bulk Si MOSFETs is analyzed through 3-D finite-element studies. Accumulation of the side interfaces is achieved by a side-gate structure surrounding the body of the transistor, which leads to the accumulation of the body for narrow structures. A separately controlled top gate is used for transistor action. The simulation results show the suppression of leakage currents by 10 6  times for no side-interface charges, and by 10 10  times for an interface positive fixed charge density of 10 12  cm −2 . The threshold voltage (V T ) can be dynamically increased by over 1 V with the accumulation of the body ( $V_{{\rm side}} = 0$ to −3 V) for W × $L = 10$ -nm × 15-nm structures, enabling electrostatic V T control and reliable high-temperature (>600 K) operation. Improvements in subthreshold slope and drain-induced barrier lowering are significant for narrower channel devices.