Investigation of Scaling on the Sensitivity and Performance of Tunnel FET Biosensor

This research investigates the scaling capability of the dopingless tunnel FET biosensor. A counter-doped Si
_0.65
Ge
_0.35
pocket and a tunnel-gate-engineered structure are incorporated to improve the performance of the proposed biosensor in the presence of trap-assisted tunneling (TAT). The effect of the scaling is examined in respect of the gate length, body thickness, and the underlap length between the gate and the drain to note the performance of the biosensor. The study shows that scaling the gate length improves the sensitivity metrics such as threshold voltage sensitivity and
on
-current sensitivity of the biosensor while sacrificing
I
_on
/
I
_off
within acceptable limits according to ITRS guidelines. In addition to this, other important metrics such as
I
_on
/
I
_off
ratio, drain-induced barrier thinning, and
on
-current are also considered to analyze the scaling capability of the proposed biosensor.