Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics · 2008 · 37 citations · 6 references
Natural SciencesMaterials EngineeringMaterials ScienceCrystal StructureMaterials CharacterizationMaterials ChemistryCrystal GrowthDefect CharacterizationDislocation MechanicsDislocations In SemiconductorsMicrostructure AnalysisMicrostructure EvolutionAluminum NitrideChemical EtchingDislocation BehaviorDislocation DensityGrain BoundariesThreading DislocationsWet Chemical EtchingWet Etching
Abstract Defect analysis is performed on 1‐inch diameter bulk AlN crystals grown on AlN‐on‐SiC templates by physical vapour transport. The mean density of threading dislocations as evaluated by wet chemical etching is about 4 × 10 4 cm –2 ; mosaicity of the crystals is mostly inherited from the quality of the SiC and the AlN‐on‐SiC template used as seed. Comparing crystals grown without and with growth optimization, the dislocation topography is significantly different, and in crystals grown under optimized conditions, low angle grain boundaries have a more pronounced tendency to dissolve into dislocation bunches and thus a lower density at the crystal top. This corresponds to a ‘coarser’. mosaic structure as observed in X‐ray rocking curve measurements. In summary, AlN bulk crystals grown on AlN‐on‐SiC templates under optimized conditions show not only significant improvement in cracking mitigation and optical homogeneity, but also in structural quality, within a single growth run. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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