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- W2079064071 abstract "The structural properties of nanometric AlN caps, grown on GaN to prevent dissociation during high temperature annealing after Eu implantation, have been characterized by scanning electron microscopy and electron probe microanalysis. The caps provide good protection up to annealing temperatures of at least 1300°C, but show localized failure in the form of irregularly shaped holes with a lateral size of 1–2μm which extend through the cap into the GaN layer beneath. Compositional micrographs, obtained using wavelength dispersive x-ray analysis, suggest that these holes form when GaN dissociates and ejects through cracks already present in the as-grown AlN caps due to the large lattice mismatch between the two materials. Implantation damage enhances the formation of the holes during annealing. Simultaneous room temperature cathodoluminescence mapping showed that the Eu luminescence is reduced in N-poor regions. Hence, exposed GaN dissociates first by outdiffusion of nitrogen through AlN cracks, thereby opening a hole in the cap through which Ga subsequently evaporates." @default.
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- W2079064071 date "2006-01-16" @default.
- W2079064071 modified "2023-09-25" @default.
- W2079064071 title "Failure mechanism of AlN nanocaps used to protect rare earth-implanted GaN during high temperature annealing" @default.
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- W2079064071 doi "https://doi.org/10.1063/1.2162797" @default.
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