Investigation of AlGaN/GaN HEMT for pH sensing applications and sensitivity optimization

IF 3.3 3区物理与天体物理 Q2 PHYSICS, CONDENSED MATTER

Superlattices and Microstructures Pub Date : 2021-12-01 DOI:10.1016/j.spmi.2021.107067

Aasif Mohammad Bhat, Nawaz shafi, C. Periasamy

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引用次数: 7

Abstract

In this work, AlGaN/GaN HEMT pH sensitive response has been presented through extensive simulations demonstrating the effect of pH variation on channel conductance, potential and conduction band profile. The pH solution is defined by an intrinsic semiconductor material whose properties are modified to mimic electrolyte solution and the effect of variation in charged adsorbates is accommodated by adjusting the interface charges density at oxide-semiconductor interface. The effect of AlGaN barrier layer composition (thickness and Aluminum mole fraction) on the sensitivity was analyzed by simulating different device configurations using ATLAS Silvaco device simulation tool. The devices render improved voltage sensitivity (S_V = ΔV_r/pH) and high output current sensitivity (S_I = (ΔI_ds/pH) = 15 mA/mm-pH). The simulations predict a thinner barrier layer along with smaller mole fraction device is most sensitive to pH changes at the surface for an open gate operation.

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AlGaN/GaN HEMT在pH传感中的应用及灵敏度优化研究

在这项工作中，通过广泛的模拟，展示了pH变化对通道电导、电位和导带剖面的影响，提出了AlGaN/GaN HEMT pH敏感响应。pH溶液由一种本征半导体材料定义，其性质被修改为模拟电解质溶液，并且通过调整氧化物-半导体界面上的界面电荷密度来调节带电吸附剂变化的影响。利用ATLAS Silvaco器件仿真工具模拟不同器件配置，分析AlGaN势垒层组成(厚度和铝摩尔分数)对灵敏度的影响。该器件具有改进的电压灵敏度(SV = ΔVr/pH)和高输出电流灵敏度(SI = (ΔIds/pH) = 15 mA/mm-pH)。模拟结果表明，对于开栅操作，较薄的阻挡层和较小的摩尔分数器件对表面pH变化最为敏感。

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来源期刊

Superlattices and Microstructures 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.20%

发文量

审稿时长

2.8 months

期刊介绍： Micro and Nanostructures is a journal disseminating the science and technology of micro-structures and nano-structures in materials and their devices, including individual and collective use of semiconductors, metals and insulators for the exploitation of their unique properties. The journal hosts papers dealing with fundamental and applied experimental research as well as theoretical studies. Fields of interest, including emerging ones, cover: • Novel micro and nanostructures • Nanomaterials (nanowires, nanodots, 2D materials ) and devices • Synthetic heterostructures • Plasmonics • Micro and nano-defects in materials (semiconductor, metal and insulators) • Surfaces and interfaces of thin films In addition to Research Papers, the journal aims at publishing Topical Reviews providing insights into rapidly evolving or more mature fields. Written by leading researchers in their respective fields, those articles are commissioned by the Editorial Board. Formerly known as Superlattices and Microstructures, with a 2021 IF of 3.22 and 2021 CiteScore of 5.4