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• W2002938062 abstract "The effects of post-oxidation on the leakage current of high-voltage AlGaN/GaN Schottky barrier diodes (SBDs) on Si(1 1 1) substrates were investigated. Auger electron spectroscopy was used to study post-oxidation mechanisms. The group-III oxides, AlOx or GaOx, were formed as indicated the oxygen on the AlGaN layer after post-oxidation. The formation of group-III oxides resulted in passivation. The diffusion of Ni into the AlGaN layer was also detected owing to the post-oxidation annealing shallow states near the Schottky contact. When post-oxidation was performed at 600 °C, all Ni at the Schottky contact was combined with oxygen. This high post-oxidation temperature was therefore unsuitable because the Schottky interface changed from Ni/AlGaN to Au/AlGaN. Leakage current until breakdown was considerably decreased after post-oxidation at 500 °C. The breakdown voltage of GaN SBD was increased from 351 to 524 V at a drift length of 20 μm by the post-oxidation. The figure-of-merit (BV2/Ron,sp) of identical device was also improved from 29.6 to 53.1 by the post-oxidation. Our results suggest that post-oxidation is suitable for GaN power switch fabrication." @default.
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• W2002938062 date "2013-03-01" @default.
• W2002938062 modified "2023-10-18" @default.
• W2002938062 title "Effects of post-oxidation on leakage current of high-voltage AlGaN/GaN Schottky barrier diodes on Si(111) substrates" @default.
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• W2002938062 doi "https://doi.org/10.1016/j.sse.2012.11.006" @default.
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