Investigation of electrolyte gated negative capacitance vertical TFET pH sensor based on biomolecule position
In an electrolyte-gated negative capacitance vertical Tunnel Field Effect Transistor (TFET) pH sensor, the position of biomolecules within the sensing region significantly impacts the device's electrical characteristics and overall sensitivity. The closer the biomolecules are to the gate dielectric-semiconductor interface, the stronger their gating effect and thus the higher the sensor's response. Impact of Biomolecule Position Gating Effect: The core principle of these biosensors is that charged biomolecules (or changes in pH causing charge variations) within the electrolyte/nanocavity area modulate the surface potential and channel conductance. The closer the biomolecules are to the active channel region, the more effectively they can modulate the tunneling barrier width, leading to a greater change in drain current ( Idscap I sub d s end-sub𝐼𝑑𝑠) and enhanced sensitivity. Nanocavity Design: Current research often employs structures with specific nanocavities (sensing areas...