Temperature analysis of Si0.55Ge0.45 sourced nanowire tunnel field-effect transistor based on charge plasma and gate stack

In this paper, conventional charge-plasma nanowire tunnel field-effect transistor (CP-NWTFET) has been applied by gate stacking and SiGe sourced to design the proposed Si0.55Ge0.45 sourced nanowire tunnel field-effect transistor based on charge plasma and gate stack (SiGe-GS-CP-NWTFET) to enhance electrical characteristics. Comparison of drain current (Id), transconductance (gm), second-order transconductance (gm2), third-order transconductance (gm3), and transconductance generation factor are analysed between conventional CP-NWTFET and SiGe-GS-CP-NWTFET. The results demonstrate that the proposed SiGe-GS-CP-NWTFET device possesses a larger drive current, transconductance, and transconductance factor those of the conventional device. Further, the impact of temperature on various parameters such as subthreshold slope (SS), threshold voltage (Vth), Ion, Ioff, and Ion/Ioff ratio is analysed for the proposed SiGe-GS-CP-NWTFET device. With an increase in temperature, both ON-current and OFF-current upsurge which results in a decrease in the current ratio. A lower subthreshold slope is observed for lower temperature, whereas a lower threshold voltage is observed for higher temperature. The parameters, like the electric field, potential, and energy band diagram which help in understanding the physics of the device, are also analysed for various temperatures. The impact of mole fraction(x) of Ge in SiGe on SS, Vth, Ion, Ioff, and Ion/Ioff ratio is also analysed for the proposed device. Ion, Ioff increase with mole fraction, whereas Vth decreases with temperature. The current ratio and SS are found to be better for the mole fraction of x = 0.45. The improved performance compared to the conventional CP-NWTFET is attributed to the superiority of the proposed SiGe-GS-CP-NWTFET device.