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Uncapped InN nanostructures undergo a deleterious natural aging process atambient conditions by oxygen incorporation. The phases involved in this processand their localization is mapped by Transmission Electron Microscopy (TEM)related techniques. The parent wurtzite InN (InN-w) phase disappears from thesurface and gradually forms a highly textured cubic layer that completely wrapsup a InN-w nucleus which still remains from original single-crystalline quantumdots. The good reticular relationships between the different crystals generatelow misfit strains and explain the apparent easiness for phase transformationsat room temperature and pressure conditions, but also disable the classicalmethods to identify phases and grains from TEM images. The application of thegeometrical phase algorithm in order to form numerical moire mappings, and RGBmultilayered image reconstructions allows to discern among the different phasesand grains formed inside these nanostructures. Samples aged for shorter timesreveal the presence of metastable InN:O zincblende (zb) volumes, which acts asthe intermediate phase between the initial InN-w and the most stable cubicIn2O3 end phase. These cubic phases are highly twinned with a proportion of50:50 between both orientations. We suggest that the existence of theintermediate InN:O-zb phase should be seriously considered to understand thereason of the widely scattered reported fundamental properties of thought to beInN-w, as its bandgap or superconductivity.

Phase mapping of aging process in InN nanostructures: oxygen incorporation and the role of the zincblende phase