In this work, a CNT based TFET label free biosensor is investigated. A nanogap is introduced under the gate at the source side where the biomolecules are fed. The drain current of the TFET depends on the gate dielectric material. Thereby, sensing of the biomolecules is achieved by dielectric modulation. The sensitivity of the device is studied in terms of the ON-current and also in terms of the threshold voltage. The effect of the cavity length and dielectric constant of the gate insulator on the sensor sensitivity is investigated. Also, the CNT chirality index is adjusted for better sensitivity. The device performance for biosensing applications is analysed for different biomolecules with different dielectric constants. Moreover, the sensitivity of the sensor for both neutral and charged biomolecules is examined. A quantum 2D simulator, which is based on self-consistent solution of non-equilibrium Green’s function and Poisson’s equation, is utilized to study the device performance. A higher device sensitivity is achieved by using low-k gate oxides and CNTs with higher chirality index. In addition, sensitivity and selectivity increases for higher charge density biomolecules. The results, provided in this work, demonstrate the ability of CNT-TFETs to function as a free-label biosensor.

在这项工作中，研究了一种基于 CNT 的 TFET 无标记生物传感器。在输入生物分子的源侧栅极下方引入纳米间隙。TFET 的漏极电流取决于栅极介电材料。因此，通过介电调制实现对生物分子的感测。根据导通电流和阈值电压研究器件的灵敏度。研究了栅极绝缘体的腔长和介电常数对传感器灵敏度的影响。此外，还调整了 CNT 手性指数以获得更好的灵敏度。针对具有不同介电常数的不同生物分子分析了生物传感应用的器件性能。此外，还检查了传感器对中性和带电生物分子的灵敏度。一个量子二维模拟器，它基于非平衡格林函数和泊松方程的自洽解，用于研究器件性能。通过使用低-k栅极氧化物和具有更高手性指数的碳纳米管。此外，对于更高电荷密度的生物分子，灵敏度和选择性也会增加。这项工作中提供的结果证明了 CNT-TFET 作为自由标记生物传感器的能力。