Applied Physics Letters · 2000 · 42 citations · 14 references
Natural SciencesMaterials EngineeringMaterials ScienceElectronic MaterialsMaterials ChemistryThin FilmsDefect CharacterizationDefects In Electronic MaterialsSemiconductor DefectsThin Film AnnealingThin-film MaterialsAnnealing Temperature EffectsDislocation AnnihilationGrain BoundariesMolecular Beam EpitaxyThermal DecompositionThermal TreatmentUltrahigh Temperature ProcessingX-ray Diffraction Analysis
Postgrowth thermal processing in the range of 1200–1400 °C is shown to improve markedly the quality of thin (∼200 nm) AlN films grown by molecular beam epitaxy on SiC substrates. Comparison of both on-axis (0002) and off-axis (101̄2) x-ray diffraction peaks documents this improvement. Cross-sectional transmission electron micrographs confirm the reduction in dislocations and grain boundaries, while plan-view micrographs demonstrate that threading defect densities can be reduced to ∼3×108/cm2 after annealing. The thermal treatment is particularly effective because of the unusually large temperature window between the onset of a near-zero reactant sticking coefficient at ∼1200 °C and AlN thermal decomposition at ∼1400 °C. The Al sticking coefficient and the AlN decomposition rate are also reported.
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Microstructure of GaN epitaxy on SiC using AlN buffer layers
F. A. Ponce, B. S. Krusor, J. S. Major et al. · Applied Physics Letters · 1995 · 207 citations