Highly oriented zinc blende CdSe nanoneedles

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Abstract
Epitaxial growth of highly oriented single-crystalline CdSe nanoneedles on GaAs substrates was obtained by metalorganic chemical vapor deposition using sputter-coated Au as a catalyst. Scanning electron microscopy revealed that they grew tidily along the ⟨110⟩ crystallographic directions and in parallel to the same directions of the substrate. Their density could be adjusted by applying different amounts of the catalyst. X-ray diffraction, transmission electron lattice imaging and electron diffraction showed that they have the zinc blende structure, which is rare for CdSe. Polarized photoluminescence studies on individual nanoneedles verify the zinc blende structure of the needles, and the strong near band edge emissions and no deep-level emissions reveal their good optical quality.