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Two-dimensional physics-based modeling of electrostatics and band-to-band tunneling in tunnel-FETs

In the last few years the Tunnel-FET has become one of the promising devices to be the successor of the MOSFET due to its CMOS compatibility and steep subthreshold slopes (S) below 60 mV/dec. In this paper a 2D physics-based analytical model for Tunnel-FETs is introduced. It predicts a 2D band-to-band tunneling probability calculation through Wentzel-Kramers-Brillouin approximation (WKB) based on a 2D solution of electrostatics with respect to the device structure and carrier distributions in the device. These results are embedded in a model for the device current. The solutions of the potential, electrical field and the current transfer characteristics of the model are in good agreement with simulation data from the finite-element-method (FEM) simulator TCAD Sentaurus.