Journal
JOURNAL OF APPLIED PHYSICS
Volume 105, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3093700
Keywords
gallium compounds; high-temperature effects; III-V semiconductors; ion beam assisted deposition; nucleation; semiconductor growth; semiconductor thin films; surface morphology
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Funding
- EU-FP6 [ERG 04/102.052/032]
- Ministry of Education and Science (MEC)
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The evolution of GaN growth on AlN and GaN nucleation layers is compared through morphological and structural analyses, including ion beam analysis. By using AlN nucleation layer grown at high temperature, improved crystalline quality is exhibited by 300 nm thin GaN epilayers. GaN (002) x-ray rocking curve as narrow as 168 arc sec and atomic-step surface morphology characterize such a thin GaN film on AlN. Defects are strongly confined into the first 50 nm of growth, whereas a fast laterally coherent growth is observed when increasing thickness, as an effect of high temperature AlN surface morphology and Ga adatom dynamics over this template.
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