Design and performance analysis of oxide-enhanced double-gate JLTFET-based biosensors with virtuous current ratio

• Published in: Applied physics. A, Materials science & processing Materials science & processing, 2024, Vol.130 (1), Article 7
• Main Authors: Karthikeyan, P., Atchaya, R.
• Format: Article
• Language: English
• Subjects: Air pockets; Applied physics; Biomolecules; Biosensors; Characterization and Evaluation of Materials; Charge density; Comparative studies; Condensed Matter Physics; Conduction bands; Devices; Electric fields; Energy bands; Machines; Manufacturing; Materials science; Mathematical analysis; Nanotechnology; Optical and Electronic Materials; Performance evaluation; Permittivity; Physics; Physics and Astronomy; Processes; Surfaces and Interfaces; Thin Films
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-023-07136-5

This article offers a design and comparative study on two variations of oxide enhanced charge plasma double gate dielectric modulated junction-less TFET-based biosensors: one featuring a design without air pockets, while the other incorporates air pockets. The fabricated devices incorporate specially shaped source and drain components that are designed to achieve specific metalwork functions at the top and bottom corners. The length of the cavity in the devices is varied between 8 and 10 nm. This study considers different dielectric constants of biomolecules, ranging from k  = 1 to k  = 23, encompassing neutral and charged species. The performance of two devices is compared and analyzed by simulating various electrical parameters, such as transfer characteristics, electric field charges, energy band diagrams of the valence and conduction bands, and surface potential, for the device. The simulations demonstrate that devices with air pockets show improved drain current, surface potential, and charge density. Thus, the introduction of air pocket-based biosensors holds promising prospects for sensitive and specific bio-analytical applications. Furthermore, the device’s performance is evaluated using different cavity lengths and dielectric constants, highlighting its potential for enhanced detection of biomolecules. The biosensor with air pockets exhibits a significantly higher I on / I off ratio, indicating its superior capability for sensitive bioanalytical applications. This proposed device achieves the highest I on / I off ratio value of 5.56E + 11 with air pockets and 4.28E + 11 without air pockets, exceed other conventional methods. The significant improvement in I on / I off ratio in devices with air pockets highlights the promising prospects of the proposed biosensor for sensitive and specific bio-analytical applications.