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TEM images of NiO–ZnO core-shell-type nanowire (a) and Ni nanodot on ZnO nanowire (b). Diameter and thickness of ZnO nanowire and NiO layer are 100 and , respectively. Average diameter of Ni nanodot is .
PL spectra for samples 1, 2, and 3 at . As indicated, four distinct transitions labeled as FX (free exciton), (neutral donor bound exciton), and (neutral acceptor bound exciton) are observed.
Temperature dependent PL spectra of sample 3 (Ni nanodot coated ZnO nanowire structure). Strong PL intensity quenching arise above . In comparison, the inset shows PL spectra for a ZnO epilayer which show strong luminescence up to room temperature.
Arrehnius fitting for sample 3. Bound exciton transitions show unusually small activation energies .
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