Improved microstructure and ohmic contact of Nb electrode on n-type 4H-SiC |
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Authors: | Kunhwa JungYuji Sutou Junichi Koike |
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Affiliation: | Department of Material Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan |
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Abstract: | Niobium was deposited as an electrode material on an n-type SiC wafer for power device application. The reaction microstructure and electrical contact property were investigated after annealing at 700 to 1000 °C and compared with the results for an Ni electrode. Microstructure-related problems of the Ni electrode could be resolved without sacrificing ohmic contact behavior with a low contact resistivity of 1.53 × 10− 4 Ω cm2. Carbon precipitation was completely eliminated with Nb by the formation of carbides, leading to good adhesion upon wire bonding process. At the reaction interface, Nb5Si3 was formed in an epitaxial relationship with SiC, leading to a good interface contact property as well as good interface adhesion. |
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Keywords: | Niobium Silicon carbide Interfacial reaction Ohmic contact X-ray diffraction Secondary ion mass spectroscopy Raman spectroscopy |
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