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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Validation of a triangular quantum well model for GaN-based HEMTs used in pH and dipole moment sensing
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Validation of a triangular quantum well model for GaN-based HEMTs used in pH and dipole moment sensing

机译：用于pH和偶极矩传感的GaN基HEMT的三角量子阱模型的验证

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摘要

Gallium nitride (GaN) is a relatively new semiconductor material that has the potential of replacing gallium arsenide (GaAs) in some of the more recent technological applications, for example chemical sensor applications. In this paper, we introduce a triangular quantum well model for an undoped AlGaN/GaN high electron mobility transistor (HEMT) structure used as a chemical and biological sensor for pH and dipole moment measurements of polar liquids. We have performed theoretical calculations related to the HEMT characteristics and we have compared them with experimental measurements carried out in many previous papers. These calculations include the current-voltage (I-V) characteristics of the device, the surface potential, the change in the drain current with the dipole moment and the drain current as a function of pH. The results exhibit good agreement with experimental measurements for different polar liquids and electrolyte solutions. It is also found that the drain current of the device exhibits a large linear variation with the dipole moment, and that the surface potential and the drain current depend strongly on the pH. Therefore, it can distinguish molecules with slightly different dipole moments and solutions with small variations in pH. The ability of the device to sense biomolecules (such as proteins) with very large dipole moments is investigated.
机译：氮化镓（GaN）是一种相对较新的半导体材料，在某些较新的技术应用（例如化学传感器应用）中，具有取代砷化镓（GaAs）的潜力。在本文中，我们为未掺杂的AlGaN / GaN高电子迁移率晶体管（HEMT）结构引入了三角形量子阱模型，该结构用作化学和生物传感器，用于测量极性液体的pH和偶极矩。我们已经进行了与HEMT特性相关的理论计算，并将其与先前许多论文中进行的实验测量进行了比较。这些计算包括器件的电流-电压（I-V）特性，表面电势，漏极电流随偶极矩的变化以及漏极电流随pH的变化。结果与不同极性液体和电解质溶液的实验测量结果吻合良好。还发现该器件的漏极电流随偶极矩表现出较大的线性变化，并且表面电势和漏极电流强烈依赖于pH。因此，它可以区分出偶极矩稍有不同的分子和溶液中pH值变化很小的溶液。研究了该装置以非常大的偶极矩感测生物分子（例如蛋白质）的能力。

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