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III-V MOSFET Structure ( InP/InAs/InGaAs) I-V Characteristics Using Silvaco TCAD Simulator

Lecture Notes in Electrical Engineering(2019)

Univ Blida 1 | Univ Sci & Technol Lille 1

Cited 2|Views6
Abstract
Our work is used to investigate the electrical proprieties of III-V MOSFET (Metal Oxide Semiconductor Field Effect Transistor) from an InP/InAs/InGaAs structure. This simulation is done using Silvaco TCAD tools. We solve the coupled Poisson-Schrodinger equation that gives the carriers concentration and their eigen state energies at each level. The fundamental equations are based on the conventional drift-diffusion model of charge transport with Fermi-Dirac statistics and electric field-dependent mobility model. We present the charge control in channel and the complete I-V characteristics of InP/InAs/InGaAs MOSFET. The results obtained show the output Id-Vds and the transfer Id-Vgs characteristic with Lg = 50 nm and To x = 4 nm. Ion of 330 mA/mm and maximum transconductance Gm of 405 mS/mm were calculated at Vd = 0.05 V. The transfer and Gm characteristics of this structure are shown with Lg of 150 nm and 100 nm respectively. Ion and Gm,ma,, reach to (270-280) mA/mm and (328-346) mS/mm respectively. It is found that the threshold voltage decreases as the channel length is reduced.
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III-V,semiconductor,InAs-MOSFET,Poissson-Shrodinger equation,Silvaco-TCAD
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要点】:本文通过使用Silvaco TCAD工具对InP/InAs/InGaAs结构的III-V MOSFET进行模拟,研究了其电学特性,并提出了一种基于耦合Poisson-Schrodinger方程的改进电荷控制方法。

方法】:采用Silvaco TCAD工具,通过解决耦合Poisson-Schrodinger方程,结合传统的漂移-扩散模型和Fermi-Dirac统计,以及依赖于电场的迁移率模型,来模拟III-V MOSFET的电学特性。

实验】:在Lg = 50 nm和Tox = 4 nm的条件下,得到了InP/InAs/InGaAs MOSFET的输出Id-Vds和转移Id-Vgs特性曲线,计算得出Ion为330 mA/mm,最大跨导Gm为405 mS/mm。在Lg分别为150 nm和100 nm的情况下,观察到Ion和Gm的最大值分别在(270-280) mA/mm和(328-346) mS/mm之间。实验数据集名称未提及,但实验结果揭示了阈值电压随通道长度减小而降低的趋势。