A Dielectric-Modulated Tunnel-FET-Based Biosensor for Label-Free Detection: Analytical Modeling Study and Sensitivity Analysis
| Autor: | Mridula Gupta, K. V. S. Reddy, Rashmi Gupta, Rakhi Narang, Manoj Saxena |
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| Rok vydání: | 2012 |
| Předmět: |
Permittivity
Materials science business.industry Transistor Dielectric Electrostatics Electronic Optical and Magnetic Materials law.invention Threshold voltage law Electronic engineering Optoelectronics Field-effect transistor Sensitivity (control systems) Electrical and Electronic Engineering business Biosensor |
| Zdroj: | IEEE Transactions on Electron Devices. 59:2809-2817 |
| ISSN: | 1557-9646 0018-9383 |
| DOI: | 10.1109/ted.2012.2208115 |
| Popis: | In this paper, an analytical model for a p-n-p-n tunnel field-effect transistor (TFET) working as a biosensor for label-free biomolecule detection purposes is developed and verified with device simulation results. The model provides a generalized solution for the device electrostatics and electrical characteristics of the p-n-p-n-TFET-based sensor and also incorporates the two important properties possessed by a biomolecule, i.e., its dielectric constant and charge. Furthermore, the sensitivity of the TFET-based biosensor has been compared with that of a conventional FET-based counterpart in terms of threshold voltage (Vth) shift, variation in the on-current (Ion) level, and Ion/Ioff ratio. It has been shown that the TFET-based sensor shows a large deviation in the current level, and thus, change in Ion can also be considered as a suitable sensing parameter. Moreover, the impacts of device parameters (channel thickness and cavity length), process variability, and process-induced damage on the sensitivity of the biosensor have also been discussed. |
| Databáze: | OpenAIRE |
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