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Wide bandgap semiconductor heterostructures based on nanowires have attractedgreat interest as one of the nanoscale building blocks for the development ofnovel optoelectronic devices. Owing to the critical role of heterogeneities andstructural imperfections in the optoelectronic properties, it has become achallenge to investigate in detail the local structure and elementalcomposition of these systems. Typically, transmission electron microscopy andenergy dispersive X-ray spectroscopy are applied to address such issues. Here,using a synchrotron nanobeam probe, we show a correlative spatially-resolvedstudy of the composition, luminescence and local structure of a Zn2GeO4/SnO2nanowire-based system. Unlike other works, the heterostructures weresynthesized by an effective catalyst-free thermal evaporation method andpresent a skewer-shaped architecture formed by Plateau-Rayleigh instability.Our results highlight the role of diffused impurities on the optical propertiesof the heterostructure and open new avenues for further heterogeneity studiesusing the X-ray nanoprobe.

Zn2GeO4/SnO2 nanowire architecture: A correlative spatially resolved X-ray study