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High temperature electron transport properties of AlGaN/GaN heterostructures with different Al-contents

Content Provider	Springer Nature Link
Author	Zhang, ZhongFen Zhang, JinCheng Xu, ZhiHao Duan, HuanTao Hao, Yue
Copyright Year	2009
Abstract	Electron transport properties in AlGaN/GaN heterostructures with different Al-contents have been investigated from room temperature up to 680 K. The temperature dependencies of electron mobility have been systematically measured for the samples. The electron mobility at 680 K were measured as 154 and 182 cm$^{2}$/V·s for Al$_{0.15}$Ga$_{0.85}$N/GaN and Al$_{0.40}$Ga$_{0.60}$N/GaN heterostructures, respectively. It was found that the electron mobility of low Al-content Al$_{0.15}$Ga$_{0.85}$N/GaN heterostructure was less than that of high Al-content Al$_{0.40}$Ga$_{0.60}$N/GaN heterostructure at high temperature of 680 K, which is different from that at room temperature. Detailed analysis showed that electron occupations in the first subband were 75% and 82% at 700 K for Al$_{0.15}$Ga$_{0.85}$N/GaN and Al$_{0.40}$Ga$_{0.60}$N/GaN heterostructures, respectively, and the two dimensional gas (2DEG) ratios in the whole electron system were 30% and near 60%, respectively. That indicated the 2DEG was better confined in the well, and was still dominant in the whole electron system for higher Al-content AlGaN/GaN heterostructure at 700 K, while lower one was not. Thus it had a higher electron mobility. So a higher Al-content AlGaN/GaN heterostructure is more suitable for high-temperature applications.
Starting Page	1879
Ending Page	1884
Page Count	6
File Format	PDF
ISSN	16721799
Journal	Science in China Series G
Volume Number	52
Issue Number	12
e-ISSN	18622844
Language	English
Publisher	SP Science in China Press
Publisher Date	2010-01-14
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	AlGaN/GaN heterostructure high-temperature electron-transport Astronomy, Observations and Techniques Classical Continuum Physics Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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