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RAVI RASTOGI1,* , DEVENDRA KUMAR TRIPATHI2, SARVESH DUBEY3, VAIBHAV PURWAR4, KUMAR SHUBHAM5
The present study investigates the sensitivity behaviour of a Junctionless graded-channel split-gate nanotube (NT) field-effect-transistor (FET) based biosensors for the detection of label-free biomolecules over a temperature range of 250–500 K over a temperature range of 250–500 K. While optimal biosensing sensitivity is observed within the physiological window (<320 K), the temperature was extended to 500 K to demonstrate the thermal reliability of the sensor platform. The proposed Bio-NT-JLFET employs a silicon nanotube FET operating in accumulation mode with graded channel doping. For smooth sensing of biomolecules and enhanced stability, a gate underlap double-sided cavity has been created in the Bio-NT-JLFET. Surface-charge densities for biomolecules were set to realistic ranges (10−7−10−8 Ccm-2) with corresponding dielectric constants, representing dry/low-ionic operation. The drain current and subthreshold swing sensitivities are higher for double-strand (𝑑𝑠) 𝐷𝑁𝐴, while threshold voltage sensitivity is higher for AI-ab biomolecule relative to the air reference. All simulations were carried out using a calibrated TCAD framework validated against a reference Si-NT-FET structure on ATLAS TCAD device simulator. The results establish the Bio-NT-JLFET as a robust candidate for ex-situ dry-state detection.
Junctionless nanotube FET biosensor, Biomolecule detection, Threshold voltage sensitivity, Drain current modulation, Dielectric-modulated FET, Temperature-dependent sensing.
RAVI RASTOGI, DEVENDRA KUMAR TRIPATHI, SARVESH DUBEY, VAIBHAV PURWAR, KUMAR SHUBHAM, Analysis of the thermal stability and sensitivity of graded-channel split-gate nanotube Junctionless FETs for dry-state biosensing, Optoelectronics and Advanced Materials - Rapid Communications, 20, 7-8, July-August 2026, pp.378-385 (2026).
Submitted at: April 6, 2026
Accepted at: Aug. 3, 2026
Optoelectronics and Advanced Materials - Rapid Communications
(2025): Impact Factor = 0.5 - Journal Citation Reports (Clarivate Analytics, 2026)
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