DM-PA-CNTFET Biosensor for Breast Cancer Detection: Analytical Model

In this paper, an analytical model for a novel design dielectric modulated plasma-assisted carbon nanotube field-effect transistor (DM-PA-CNTFET) biosensor is proposed for breast cancer detection. This work is based on a PA-CNTFET in which CNT is used as a channel of FET, and various other device engineering techniques such as dual metal gate-all-around structure and dielectric stack of SiO₂ and HfO₂ have been used. A comparative analysis of DS-GAAE-CNTFET was performed using a silicon gate all-around FET (Silicon-GAA-FET)-based biosensor. Early detection of breast cancer is made possible by immobilizing MDA-MB-231 and HS578t into the dual-sided nanocavity, which alters the electrical properties of the proposed CNTFET-based biosensor. The DS-GAAE-CNTFET sensor demonstrates a drain ON current sensitivity of 236.9 nA and a threshold voltage sensitivity of 285.58 mV for HS578t cancer cells. Malignant MDA-MB-231 breast cells exhibit a higher drain ON current sensitivity of 343.35 nA and a corresponding threshold voltage sensitivity of 293.23 mV. The exceptional sensitivity and structural resilience of the DS-GAAE-CNTFET biosensor establish it as a promising candidate for early breast cancer detection.