Modeling and Performance Evaluation of a Bio-TFET with Segmented PN Channel and H-Channel L-Cavity Architecture
摘要
This work presents a novel HC-LC-BTFET (H-Channel with L-Cavity Bio-TFET) structure, designed for label-free and highly sensitive biomolecule detection. The design mainly focuses on the horizontally arranged H-channel with PNP-i-PN doping model such that the source region is heavily doped with P+, followed by a vertically stacked N+ and P+ segment on the left arm of the channel, which together serve as an tunneling region. It produces early current conduction and high-energy band bending at the source-channel interface, thus improving the electrical properties of the biomolecules when they are placed in the four-cornered L-shaped nanocavities. The central segment of the H-channel is intrinsic the right arm is P-type, and N+-doped drain enables efficient band-to-band tunneling. The two different metal gates enchance the electrostatic field and controls the gate. The structure is simulated with the use of Silvaco Atlas TCAD, and the results are observed for various biomolecules ranges from K = 1 to 22. As studied from recent papers, this structure includes the drain pocket (DP) as well as an additional drain gate (DG) to achieve high drain current characteristics. The device performance under different channel-width configurations is analyzed and discussed in this paper. Among these, the best results at the H-channel configuration show a high