Ballistic quantum transport in L-shaped Vertical Halo-Implanted p+-GaSb/InAs n-TFETs

Abstract: In the present work, we have investigated ballistic quantum transport in vertical halo implanted p plus minus GaSb InAs n TFETs. We have investigated the current voltage characteristics, ON current, OFF current leakage, subthreshold swing variation as function of gate length, drain length, gate undercut, equivalent oxide thickness, High K and drain thickness. The electrostatic control, I V performances and optimization of device structure are carried out for novel L shaped nonlinear geometry n TFETs. In the n TFETs device p plus minus GaSb InAs heterostructure gives rise to type III broken gap band alignment. In this geometry the gate electric field and tunnel junction internal field are oriented in same direction and assist the Band to Band tunnelling process. To study the ballistic quantum transport in this L shaped nonlinear geometry we used 3 D, full-band atomistic sp3d5s spin orbital coupled tight binding method based quantum mechanical simulator which works on the basis of Non Equilibrium Green Function formalism to solve coupled Poisson Schr "odinger equation self consistently for potentials and Local Density of state.