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Dielectric-Modulated Impact-Ionization MOS (DIMOS) Transistor as a Label-free Biosensor

In this letter, we propose a dielectric-modulated Impact-Ionization MOS (DIMOS) transistor based sensor for application in label-free detection of biomolecules. Numerous reports exist on the experimental demonstration of nanogap-embedded FET-based biosensors, but an I-MOS based biosensor has not been reported previously. The concept of a dielectric-modulated I-MOS based biosensor is presented in this letter based on TCAD simulation study. The results indicate a high sensitivity to the presence of biomolecules even at small channel lengths. In addition, a low variability of the sensitivity to the charges on the biomolecule is observed. The high sensitivity, dominance of dielectric-modulation effects and operation at even small channel lengths makes the DIMOS biosensor a promising alternative for CMOS-based sensor applications.