Abstract
Label-free biomolecular sensors have been widely studied due to their simple operation. L-shaped tunneling field-effect transistors (LTFETs) are used in biosensors due to their low subthreshold swing, off-state current, and power consumption. In a dielectric-modulated LTFET (DM-LTFET), a cavity is trenched under the gate electrode in the vertical direction and filled with biomolecules to realize the function of the sensor. A 2D simulator was utilized to study the sensitivity of a DM-LTFET sensor. The simulation results show that the current sensitivity of the proposed structure could be as high as 2321, the threshold voltage sensitivity could reach 0.4, and the subthreshold swing sensitivity could reach 0.7. This shows that the DM-LTFET sensor is suitable for a high-sensitivity, low-power-consumption sensor field.
Highlights
In recent years, field-effect transistor (FET) biosensors have been studied by many researchers [1,2,3,4,5]
Dielectric modulation is used to engrave a part of the gate oxide under the gate electrode to form a nanocavity, which is filled with biomolecules
In a dielectric-modulated L-shaped tunneling fieldeffect transistor (DM-Lshaped tunneling field-effect transistors (LTFETs)), only one cavity needs to be trenched under the gate electrode, which is filled with biomolecules; this setup is simple to operate and low in cost
Summary
Field-effect transistor (FET) biosensors have been studied by many researchers [1,2,3,4,5]. Computer-Aided Design (TCAD) simulations that were used to identify the sensitivity of a double-gate dielectric modulation junctionless TFET for biomolecule recognition, Wadhwa and Raj studied the influence of the cavity length, different biomolecules, and different charges on the drain current, subthreshold swing (SS), and Ion /Ioff [20]. Conducted research on biosensors based on a SiGe source dual-gate TFET. In a dielectric-modulated L-shaped tunneling fieldeffect transistor (DM-LTFET), only one cavity needs to be trenched under the gate electrode, which is filled with biomolecules; this setup is simple to operate and low in cost. The influences of different biomolecules (different dielectric constants, different biomolecules), the cavity thickness and charged biomolecules on transfer characteristics, and the current sensitivity and threshold voltage sensitivity of the proposed sensor were studied.
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