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The degradation mechanism of an AlGaN/GaN high electron mobility transistor under step-stress |
Chen Wei-Wei (陈伟伟)a b, Ma Xiao-Hua (马晓华)a b, Hou Bin (侯斌)a b, Zhu Jie-Jie (祝杰杰)a b, Zhang Jin-Cheng (张进成)b, Hao Yue (郝跃)b |
a School of Technical Physics, Xidian University, Xi’an 710071, China; b Key Laboratory for Wide Band-Gap Semiconductor Materials and Devices, School of Microelectronics, Xidian University, Xi’an 710071, China |
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Abstract Step-stress experiments are performed in this paper to investigate the degradation mechanism of an AlGaN/GaN high electron mobility transistor (HEMT). It is found that the stress current shows a recoverable decrease during each voltage step and there is a critical voltage beyond which the stress current starts to increase sharply in our experiments. We postulate that defects may be randomly induced within the AlGaN barrier by the high electric field during each voltage step. But once the critical voltage is reached, the trap concentration will increase sharply due to the inverse piezoelectric effect. A leakage path may be introduced by excessive defect, and this may result in the permanent degradation of the AlGaN/GaN HEMT.
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Received: 12 March 2013
Revised: 04 April 2013
Accepted manuscript online:
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PACS:
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73.61.Ey
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(III-V semiconductors)
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85.30.Tv
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(Field effect devices)
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78.30.Fs
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(III-V and II-VI semiconductors)
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Fund: Project supported by the Program for New Century Excellent Talents in University (Grant No. NCET-12-0915). |
Corresponding Authors:
Ma Xiao-Hua
E-mail: xhma@xidian.edu.cn
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Cite this article:
Chen Wei-Wei (陈伟伟), Ma Xiao-Hua (马晓华), Hou Bin (侯斌), Zhu Jie-Jie (祝杰杰), Zhang Jin-Cheng (张进成), Hao Yue (郝跃) The degradation mechanism of an AlGaN/GaN high electron mobility transistor under step-stress 2013 Chin. Phys. B 22 107303
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