Journal
JOURNAL OF APPLIED PHYSICS
Volume 99, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2206883
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We have grown In0.25Ga0.75N films on nearly lattice-matched ZnO (000 (1) over bar) substrates with atomically flat surfaces at low substrate temperatures using pulsed laser deposition. We have found that InGaN having a stepped and terraced structure on its surface grows at low substrate temperatures. We have also found that InGaN grows in the layer-by-layer mode, even at room temperature (RT), while maintaining straight steps and atomically flat terraces from the first monolayer. This phenomenon exhibits a singular contrast to the case of RT epitaxy of GaN on ZnO, where a considerable number of defects are observed on the stepped structure of the first several layers. This difference can be attributed to a smaller lattice mismatch between InGaN and ZnO.
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