Modification of REO by subsequent III-N EPI process

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A method of growing single crystal III-N material on a semiconductor substrate includes providing a substrate including one of crystalline silicon or germanium and a layer of rare earth oxide. A layer of single crystal III-N material is epitaxially grown on the substrate using a process that elevates the temperature of the layer of rare earth oxide into a range of approximately 750° C. to approximately 1250° C. in the presence of an N or a III containing species, whereby a portion of the layer of rare earth oxide is transformed to a new alloy.