Needle work: AlN/ZnO and GaN/ZnO coaxial nanoneedle heterostructures (see TEM image) have a higher secondary electron emission (SEE) yield (σ) than thin films of AlN and GaN deposited on Si substrates. The dependence of the SEE on the incidence angle of the beam indicates that these heterostructures do not follow the power law. The σ value of the heterostructures is enhanced by the inherited nanostructure from the ZnO nanoneedle template.
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Lau et al. (2006) studied this question.
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