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Electrical and Computer Engineering
Electrical and Computer Engineering Publications
VAPOR-PHASE-EPITAXY; MG-DOPED GAN; BUFFER LAYER; DISLOCATION DENSITY; LATERAL EPITAXY; THIN-FILMS; DEPOSITION
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Full-Text Articles in Engineering
Defect Reduction With Quantum Dots In Gan Grown On Sapphire Substrates By Molecular Beam Epitaxy, D. Huang, Michael A. Reshchikov, F. Yun, T. King, A. A. Baski, Hadis Morkoç
Defect Reduction With Quantum Dots In Gan Grown On Sapphire Substrates By Molecular Beam Epitaxy, D. Huang, Michael A. Reshchikov, F. Yun, T. King, A. A. Baski, Hadis Morkoç
Electrical and Computer Engineering Publications
The GaN films grown on buffer layers containing quantum dots by molecular beam epitaxy on sapphire substrates were investigated. The density of the dislocations in the films was determined by wet chemical etching and atomic force microscopy. It was found that the insertion of a set of multiple GaN quantum-dot layers in the buffer layer effectively reduces the density of the dislocations in the epitaxial layers. As compared to the dislocation density of ∼1010 cm−2in the typical GaN films grown on AlNbuffer layer, a density of ∼3×107 cm−2 was demonstrated in the GaN films grown with quantum dot layers.