Abstract
We here present an experimental study on (010)-oriented β-Ga2O3 thin films homoepitaxially grown by plasma assisted molecular beam epitaxy. We study the effect of substrate treatments (i.e., O-plasma and Ga-etching) and several deposition parameters (i.e., growth temperature and metal-to-oxygen flux ratio) on the resulting Ga2O3 surface morphology and growth rate. In situ and ex-situ characterizations identified the formation of (110) and (1¯10)-facets on the nominally oriented (010) surface induced by the Ga-etching of the substrate and by several growth conditions, suggesting (110) to be a stable (yet unexplored) substrate orientation. Moreover, we demonstrate how metal-exchange catalysis enabled by an additional In-flux significantly increases the growth rate (>threefold increment) of monoclinic Ga2O3 at high growth temperatures, while maintaining a low surface roughness (rms < 0.5 nm) and preventing the incorporation of In into the deposited layer. This study gives important indications for obtaining device-quality thin films and opens up the possibility to enhance the growth rate in β-Ga2O3 homoepitaxy on different surfaces [e.g., (100) and (001)] via molecular beam epitaxy.
Highlights
In order to fulfill this task, it is necessary to synthesize Ga2O3 thin films characterized by a high crystalline order, allowing at the same time the control of the material structure at the atomic scale
We study the effect of substrate treatments (i.e., O-plasma and Ga-etching) and several deposition parameters on the resulting Ga2O3 surface morphology and growth rate
We demonstrate how metal-exchange catalysis enabled by an additional In-flux significantly increases the growth rate (>threefold increment) of monoclinic Ga2O3 at high growth temperatures, while maintaining a low surface roughness and preventing the incorporation of In into the deposited layer
Summary
In order to fulfill this task, it is necessary to synthesize Ga2O3 thin films characterized by a high crystalline order, allowing at the same time the control of the material structure at the atomic scale.
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