High-current, high-voltage AlN Schottky barrier diodes

被引:0
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作者
Quiñones, C.E. [1 ]
Khachariya, D. [2 ]
Reddy, P. [2 ]
Mita, S. [2 ]
Almeter, J. [1 ]
Bagheri, P. [1 ]
Rathkanthiwar, S. [1 ]
Kirste, R. [2 ]
Pavlidis, S. [3 ]
Kohn, E. [2 ]
Collazo, R. [1 ]
Sitar, Z. [1 ,2 ]
机构
[1] Department of Materials Science and Engineering, North Carolina State University, Raleigh,NC,27606, United States
[2] Adroit Materials, Cary,NC,27518, United States
[3] Department of Electrical and Computer Engineering, North Carolina State University, Raleigh,NC,27606, United States
关键词
AlN Schottky barrier diodes with low ideality factor (2); high current density (>5 kA cm−2); and high breakdown voltage (680 V) are reported. The device structure consisted of a two-layer; quasi-vertical design with a lightly doped AlN drift layer and a highly doped Al0.75Ga0.25N ohmic contact layer grown on AlN substrates. A combination of simulation; current-voltage measurements; and impedance spectroscopy analysis revealed that the AlN/AlGaN interface introduces a parasitic electron barrier due to the conduction band offset between the two materials. This barrier was found to limit the forward current in fabricated diodes. Further; we show that introducing a compositionally-graded layer between the AlN and the AlGaN reduces the interfacial barrier and increases the forward current density of fabricated diodes by a factor of 104 © 2024 The Author(s). Published on behalf of The Japan Society of Applied Physics by IOP Publishing Ltd;
D O I
10.35848/1882-0786/ad81c9
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