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(a) Near band edge emission PL spectra of bare ZnO NWs (dotted line) and MgZnO/ZnO coaxial NW heterostructures (solid line). The inset shows the absence of visible emission. (b) The integrated PL intensities over the entire measured wavelength range for bare ZnO NWs and MgZnO/ZnO coaxial NW heterostructures at various temperatures in the range of 10–200 K.
10 K TRPL decay curves of ZnO NWs (dotted line) and MgZnO/ZnO coaxial NW heterostructures (solid line).
(a) Schematics of CdZnO/ZnO axial NW SQW with/without MgZnO shell layer. (b) Scanning electron microscopy image of CdZnO/ZnO axial NW SQWs. (c) High-resolution transmission electron microscopy (HR-TEM) image of the tip of a CdZnO/ZnO axial NW SQW. (d) HR-TEM image of a MgZnO/ZnO coaxial NW heterostructure.
8 K CL spectra obtained from different electron beam irradiation positions. (a) CdZnO/ZnO axial NW SQW with ZnO stem. (b) CdZnO/ZnO axial NW SQW with a MgZnO/ZnO coaxial stem. The numbers on the right axes are the distances between the electron beam spot and the CdZnO SQW region.
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