Abstract
In this paper, Ga2O3 thin films were grown on c-plane sapphire substrates by metal-organic chemical vapor deposition (MOCVD). There was phase transition for samples grown with different flow rates of triethyl-gallium (TEGa) and deionized water (H2O). It is found that ε-Ga2O3 is difficult to coalesce and the phase mixture by βGa2O3 takes place if the flow rates of TEGa and H2O are too high. However, by using multiple-step growth method, the film became fully coalesced. High-quality ε-Ga2O3 thin film with atomically flat surface and multilayer morphology was obtained.
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