Impact of Device Geometry of the Fin Electron-Hole Bilayer Tunnel FET

We study the impact of quantum mechanical effects on the fin Electron-Hole Bilayer Tunnel FET (EHBTFET) considering different geometries. Through quantum simulations based on the effective mass approximation (EMA), it is found that the fin EHBTFET is affected by the corner effects at the substrate-fin interface, due to reduced electrostatic control that causes a dramatic reduction of the ON current. Three different solutions; corner smoothing, corner doping and trapezoidal fins; are proposed and their efficiency are assessed. The corner smoothing turns out to be ineffective whereas trapezoidal fins entail a device performance trade-off. Utilizing corner doping is the most viable choice to achieve a large ON current.