Abstract
Polarization-dependent x-ray absorption measurements were performed oncrystalline ZnO three-dimensional arrays consisting of highly orientedmicrorods as well as on particulate thin films consisting of monodispersespherical nanoparticles. Strong anisotropic effects have been observed for thehighly oriented ZnO rods, but not for the isotropic spherical nanoparticles.Full-potential calculations of the orbital-resolved x-ray absorption of aZnO wurtzite periodic crystal, including Zn 3d among the valence states,show very good agreement with the experimental findings. Comprehensivefundamental knowledge of the electronic structure of ZnO is obtainedby probing and demonstrating the orbital symmetry of oxygen and itscontribution to the conduction band of this important II–VI semiconductor.
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