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Atomic-layer-deposited Al2O3 and HfO2 on InAlAs: A comparative study of interfacial and electrical characteristics |
Li-Fan Wu(武利翻)1,2, Yu-Ming Zhang(张玉明)1, Hong-Liang Lv(吕红亮)1, Yi-Men Zhang(张义门)1 |
1 School of Microelectronics, Xidian University, Key Laboratory of Wide Band-Gap Semiconductor Materials and Devices of China, Xi'an 710071, China; 2 School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an 710121, China |
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Abstract Al2O3 and HfO2 thin films are separately deposited on n-type InAlAs epitaxial layers by using atomic layer deposition (ALD). The interfacial properties are revealed by angle-resolved x-ray photoelectron spectroscopy (AR-XPS). It is demonstrated that the Al2O3 layer can reduce interfacial oxidation and trap charge formation. The gate leakage current densities are 1.37×10-6 A/cm2 and 3.22×10-6A/cm2 at +1 V for the Al2O3/InAlAs and HfO2/InAlAs MOS capacitors respectively. Compared with the HfO2/InAlAs metal-oxide-semiconductor (MOS) capacitor, the Al2O3/InAlAs MOS capacitor exhibits good electrical properties in reducing gate leakage current, narrowing down the hysteresis loop, shrinking stretch-out of the C-V characteristics, and significantly reducing the oxide trapped charge (Qot) value and the interface state density (Dit).
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Received: 28 September 2015
Revised: 15 June 2016
Accepted manuscript online:
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PACS:
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81.05.Ea
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(III-V semiconductors)
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77.55.+f
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Fund: Project supported by the National Basic Research Program of China (Grant No. 2010CB327505), the Advanced Research Foundation of China (Grant No. 914xxx803-051xxx111), the National Defense Advance Research Project, China (Grant No. 513xxxxx306), the National Natural Science Foundation of China (Grant No. 51302215), the Scientific Research Program Funded by Shaanxi Provincial Education Department, China (Grant No. 14JK1656), and the Science and Technology Project of Shaanxi Province, China (Grant No. 2016KRM029). |
Corresponding Authors:
Hong-Liang Lv
E-mail: hllv@mail.xidian.edu.cn
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Cite this article:
Li-Fan Wu(武利翻), Yu-Ming Zhang(张玉明), Hong-Liang Lv(吕红亮), Yi-Men Zhang(张义门) Atomic-layer-deposited Al2O3 and HfO2 on InAlAs: A comparative study of interfacial and electrical characteristics 2016 Chin. Phys. B 25 108101
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