Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 7, Issue 9, Pages 3323-3327Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2007.661
Keywords
CL; ZnO nanotube; impurities distribution; donor-acceptor pair; donor bound exciton
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Low-energy cathodoluminescence (CL) imaging and spectroscopy technique was employed to study the impurity distribution in individual ZnO hexagonal nanotubes fabricated by metalorganic chemical vapor deposition on the sapphire (0001) substrate. The CL spectra at 10 K show that acceptor and donor impurities are incorporated in the ZnO nanotubes. CL monochromatic images indicate that the concentration of donor is higher at the bottom part and the distribution of acceptors is more inhomogeneous at the surface of the nanotubes. The non-uniform defects and impurities distributions are explained by unstable growth conditions and contamination from the environment. These results indicate that the low-energy CL is a very powerful method to investigate the inhomogeneity of luminescence properties in the individual nanostructures.
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