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NBE cathodoluminescence spectra of samples 1–4 taken at room temperature. The peaks are at 382, 384, 385, and , respectively. Inset: broad-range CL spectra of the same samples.
Arrhenius plot showing the decay of normalized NBE luminescence intensity with increasing temperature for sample 1 (open squares), sample 2 (open circles), sample 3 (open diamonds), and sample 4 (open triangles). The linear fits (solid lines) yielded activation energies of , , , and for samples 1, 2, 3, and 4, respectively. The data were vertically offset for clarity. Inset: Exponential decrease of CL intensity for sample 1 (open squares) and the fit (solid line).
Decrease of activation energy as a function of ionized acceptor concentration. Inset: Temperature dependence of hole concentration in sample 4.
Room-temperature electronic properties of Sb-doped -type ZnO films.
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