NANOSCALE AND MICROSCALE SIMULATIONS OF N-N JUNCTION HETEROSTRUCTURES OF 3C-4H SILICON CARBIDE

材料科学 异质结 碳化硅 光电子学 微尺度化学 二极管 宽禁带半导体 工程物理 纳米技术 电子工程 物理 数学教育 数学 工程类 冶金
作者
Muhammad Haroon Rashid,Ants Koel,Toomas Rang,Reto Gähwiler,MARTIN GROSBERG,Rauno Jõemaa
出处
期刊:WIT transactions on engineering sciences 卷期号:1: 235-248
标识
DOI:10.2495/mc170241
摘要

Heterostructures have become essential constituents of most advanced electronic devices.These structures are well suitable for high frequency and fast switching digital electronic applications.Heterostructures are of great interest because motion of charge carriers can be controlled by modifying energy band profiles of constituent materials.During the last few years, heterostructures based on silicon carbide (SiC) polytypes have come to prominence due to their promising physical and electrical properties.Silicon carbide heterostructures fabricated from their most popular polytypes, 3C-SiC, 4H-SiC and 6H-SiC have high value of breakdown voltages and hole mobility.They are extensively used as power electronic devices, sensors and light emitting diodes.Attractive properties and a wide range of applications of SiC heterostructures are pleading the researchers to work in this field.The intention of presented work is to contribute in this area by simulating novel devices based on SiC heterostructures with better electrical properties.For this purpose, heterostructure diodes based on n-type 4H-SiC and n-type 3C-SiC polytypes are simulated at micro and nanoscales.Microlevel simulations have been carried out with the SILVACO TCAD software tool, whereas nanoscale simulations have been done with Quantumwise Atomistix with Virtual Nano Lab (VNL) software toolkit.Different mobility and recombination models appropriate for constituent polytypes have also been implemented during simulations in SILVACO TCAD.Band alignment in structures and IV-curve of microscale simulated device have been deliberated in this paper.Transmission spectrum, projected device density of states (PDDOS) and IV-Curves obtained from nanoscale simulated diodes with titanium, gold and semiconductor itself as an electrode have been investigated and analyzed.
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