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A dielectric-modulated double gate bilayer electrodes organic thin-filmtransistor (DMDGBE-OTFT) based sensor is proposed for label-free biomoleculedetection. The double gate of DMDGBE-OTFT is used for creating two symmetricalgates underlap regions on both sides of the organic semiconductor. The parallelimmobilization of biomolecule in two gates underlaps region changes theon-current (ION) of the DMDGBEOTFT. Bilayer electrode is also used forsignificant reduction of barrier height to enhance the performance of theproposed device. The change in the drain current has been utilized to evaluatethe sensitivity of the DMDGBE-OTFT for biomolecule recognition having differentdielectric constants and corresponding charge densities using 2-D physics-basednumerical simulation when biomolecules are immobilized in the gate underlaparea. The ATLAS TCAD tool is used to investigate the sensitivity performance ofthe DMDGBE-OTFT. The proposed DMDGBE-OTFT has 24.2% higher sensitivity incomparison to the recently reported OTFT-based biosensors for label-freedetection of biomolecules. The DMDGBE-OTFT biosensor has a lot of potential forflexible biosensing applications in the future because of its flexibility, highsensitivity, biocompatibility and low cost.

Dielectric-Modulated Double Gate Bilayer Electrode Organic Thin Film  Transistor-based Biosensor for Label-Free Detection: Simulation Study and  Sensitivity Analysis