Influence of the barrier layer on the electrical properties of V/Al-based Ohmic contact is investigated by comparing the surface morphology and alloying results of V/Al/Ni/Au (with barrier Ni) and V/Al/Cr/Au (with barrier Cr) contacts on n-AlGaN (Al molar fraction>60%) after 850 °C annealing. Due to the clustering of Ni during annealing, a thin Al layer (AlOx) and a number of Al-Au alloy clusters are formed at the contact interface of n-AlGaN, which increases the contact resistance of the V/Al/Ni/Au Ohmic contacts. In contrast, the annealed V/Al/Cr/Au electrodes cover the surface uniformly, which not only contributes to the increased contact area, but also suppresses the formation of high resistance products. Thanks to the Cr barrier layer, the specific contact resistivity of V/Al-based Ohmic contact is reduced by 26%.
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3 June 2024
Research Article|
June 05 2024
Influence of the barrier layer on the electrical properties of the V/Al-based Ohmic contact on n-type high-Al-fraction AlGaN
X. Q. Guo;
X. Q. Guo
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Writing – original draft)
1
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University
, Beijing 100871, People's Republic of China
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F. J. Xu
;
F. J. Xu
a)
(Conceptualization, Data curation, Funding acquisition, Investigation, Resources, Supervision, Writing – review & editing)
1
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University
, Beijing 100871, People's Republic of China
a)Author to whom correspondence should be addressed: fjxu@pku.edu.cn
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J. Lang
;
J. Lang
(Formal analysis, Investigation)
1
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University
, Beijing 100871, People's Republic of China
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J. M. Wang
;
J. M. Wang
(Formal analysis, Investigation)
1
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University
, Beijing 100871, People's Republic of China
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L. S. Zhang;
L. S. Zhang
(Investigation)
1
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University
, Beijing 100871, People's Republic of China
2
Beijing SinoGaN Semiconductor Technology Co., Ltd.
, Beijing 101399, People's Republic of China
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Z. Y. Zhang;
Z. Y. Zhang
(Investigation)
1
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University
, Beijing 100871, People's Republic of China
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C. Ji;
C. Ji
(Investigation)
1
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University
, Beijing 100871, People's Republic of China
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F. Y. Tan;
F. Y. Tan
(Investigation)
1
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University
, Beijing 100871, People's Republic of China
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C. Z. Ji
;
C. Z. Ji
(Investigation)
1
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University
, Beijing 100871, People's Republic of China
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Y. Wu;
Y. Wu
(Investigation)
1
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University
, Beijing 100871, People's Republic of China
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X. N. Kang
;
X. N. Kang
(Formal analysis, Investigation)
1
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University
, Beijing 100871, People's Republic of China
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N. Tang
;
N. Tang
(Formal analysis)
1
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University
, Beijing 100871, People's Republic of China
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X. Q. Wang
;
X. Q. Wang
(Formal analysis)
1
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University
, Beijing 100871, People's Republic of China
3
Nano-optoelectronics Frontier Center of Ministry of Education, Peking University
, Beijing 100871, People's Republic of China
4
Collaborative Innovation Center of Quantum Matter
, Beijing 100871, People's Republic of China
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Z. X. Qin;
Z. X. Qin
(Investigation)
1
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University
, Beijing 100871, People's Republic of China
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W. K. Ge;
W. K. Ge
(Formal analysis, Writing – review & editing)
1
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University
, Beijing 100871, People's Republic of China
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B. Shen
B. Shen
(Conceptualization, Funding acquisition, Resources, Supervision, Validation)
1
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University
, Beijing 100871, People's Republic of China
3
Nano-optoelectronics Frontier Center of Ministry of Education, Peking University
, Beijing 100871, People's Republic of China
4
Collaborative Innovation Center of Quantum Matter
, Beijing 100871, People's Republic of China
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a)Author to whom correspondence should be addressed: fjxu@pku.edu.cn
Appl. Phys. Lett. 124, 232106 (2024)
Article history
Received:
March 16 2024
Accepted:
May 27 2024
Citation
X. Q. Guo, F. J. Xu, J. Lang, J. M. Wang, L. S. Zhang, Z. Y. Zhang, C. Ji, F. Y. Tan, C. Z. Ji, Y. Wu, X. N. Kang, N. Tang, X. Q. Wang, Z. X. Qin, W. K. Ge, B. Shen; Influence of the barrier layer on the electrical properties of the V/Al-based Ohmic contact on n-type high-Al-fraction AlGaN. Appl. Phys. Lett. 3 June 2024; 124 (23): 232106. https://doi.org/10.1063/5.0208669
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