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- W1986624983 abstract "To clarify the mechanisms governing the formation and reduction of threading dislocations (TDs) in aluminum nitride (AlN) layers grown on SiC (0 0 0 1) substrates by metalorganic vapor phase epitaxy (MOVPE), we characterized the mosaicity and the growth mode. High-density (∼1011 cm−2) three-dimensional (3D) AlN islands nucleate on the substrate. Because the islands are slightly misoriented with respect to each other, dislocations are generated with a high density of 1010–1011 cm−2 as the islands coalesce. However, most of the dislocations are annihilated because their propagation direction changes horizontally during the island growth. Thus, at the initial growth stage, the dislocation density is drastically decreased to 108–109 cm−2. Consequently, as the layer thickness increases, the defect-free region becomes larger and the misorientation becomes smaller. On the other hand, we found that the TDs induce a large tensile strain and that the residual strain decreases with decreasing dislocation density. From the relationship between a- and c-lattice strains, the Poisson ratio of AlN was determined to be 0.19." @default.
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- W1986624983 date "2007-01-01" @default.
- W1986624983 modified "2023-09-27" @default.
- W1986624983 title "Threading dislocations in heteroepitaxial AlN layer grown by MOVPE on SiC (0001) substrate" @default.
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- W1986624983 doi "https://doi.org/10.1016/j.jcrysgro.2006.10.032" @default.
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