Abstract
ZnO nanorod arrays and nanowires were grown by hydrothermal and vapor phase deposition methods, respectively. At low temperature, the photoluminescence (PL) spectra of both samples are dominated by a broad peak around 3.34 eV. Combined with excitation density-dependent PL spectra and surface passivation process, it is indicated from temperature-dependent PL results that the 3.34 eV emission could be attributed to free electron-to-neutral acceptor transitions. The acceptor level is estimated to be ∼100 meV.
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