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Abstract

This paper describes successfully formed ohmic contacts to p-type 4H-SiC based on titanium-aluminum alloys. Four different metallization structures were examined, varying in aluminum layer thickness (25, 50, 75, 100 nm) and with constant thickness of the titanium layer (50 nm). Structures were annealed within the temperature range of 800°C - 1100°C and then electrically characterized. The best electrical parameters and linear, ohmic character of contacts demonstrated structures with Al layer thickness equal or greater than that of Ti layer and annealed at temperatures of 1000°C or higher.
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Bibliography

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Authors and Affiliations

Agnieszka Martychowiec
1
Norbert Kwietniewski
1
Kinga Kondracka
1
Aleksander Werbowy
1
Mariusz Sochacki
1

  1. Warsaw University of Technology, Institute of Microelectronics and Optoelectronics, Koszykowa 75, 00-662 Warsaw, Poland
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Abstract

Semiconducting GaN can realize high performance electronic and power devices owing to its high electron mobility and thermal conductivity where good metal-semiconductor contact is prerequisite. In this work, using thermal atomic layer deposition (ALD), ZnO interlayer was grown at 80°C on GaN and the Pt/ZnO/GaN heterojunctions were electrically characterized. The analyses on the current–voltage (I–V) and capacitance (C–V) data showed that the forward I–V conduction was involved with the inhomogeneous Schottky barrier. The higher density of interface states from I–V data than that from C–V data was attributed to nonuniform distribution of interface states. In addition, high density of interface states caused localized high electric field, caused higher Poole Frenkel emission coefficients than the theoretical one.
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Authors and Affiliations

Hogyoung Kim
1
ORCID: ORCID
Ye Bin Won
2
ORCID: ORCID
Byung Joon Choi
2
ORCID: ORCID

  1. Seoul National University of Science and Technology, Department of Visual Optics, Seoul 01811, Korea
  2. Seoul National University of Science and Technology, Department of Material Science and Engineering, Seoul 01811, Korea

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