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<p>A novel L-shaped channel Tunnel field effect transistor (TFET) has been explored and examined to be used as a pH sensor for the detection of pH levels in human fluids. The L-shaped channel structure relies on vertical and corner tunneling, enabling current conduction along the L-shaped direction. The electrical performance of the device is evaluated by defining its physical parameters, such as the electric field, potential, and energy band diagram. The pH model has been developed to calculate the density of states for use in the ATLAS simulator as a function of electrolyte pH. Due to its L-shaped channel structure, it exhibits very steep switching characteristics with a very low subthreshold slope (10&#xa0;mV/dec). The output current sensitivity and threshold voltage sensitivity are also evaluated using the responsive voltage. The voltage sensitivity of the proposed pH sensor is 12 times (approximately 357&#xa0;mV/pH) higher than the Nernst limit (59&#xa0;mV/pH). In addition, at higher temperatures (T = 400&#xa0;K), the proposed structure is reliable and shows less variation.</p>

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Exploring the Sensitivity of L-Shaped Channel Tunnel FET Based pH Sensor of Bio-Electrolyte Detection

  • 期刊论文

  • 发表日期：

    2026年1月14日

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  • Sruti Suvadarsini Singh,
  • Prasanna Kumar Sahu

摘要

A novel L-shaped channel Tunnel field effect transistor (TFET) has been explored and examined to be used as a pH sensor for the detection of pH levels in human fluids. The L-shaped channel structure relies on vertical and corner tunneling, enabling current conduction along the L-shaped direction. The electrical performance of the device is evaluated by defining its physical parameters, such as the electric field, potential, and energy band diagram. The pH model has been developed to calculate the density of states for use in the ATLAS simulator as a function of electrolyte pH. Due to its L-shaped channel structure, it exhibits very steep switching characteristics with a very low subthreshold slope (10 mV/dec). The output current sensitivity and threshold voltage sensitivity are also evaluated using the responsive voltage. The voltage sensitivity of the proposed pH sensor is 12 times (approximately 357 mV/pH) higher than the Nernst limit (59 mV/pH). In addition, at higher temperatures (T = 400 K), the proposed structure is reliable and shows less variation.