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Photoluminescence of CdSe nanowires grown with and without metal catalyst

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Abstract

We present temperature and power dependent photoluminescence measurements on CdSe nanowires synthesized via vapor-phase with and without the use of a metal catalyst. Nanowires produced without a catalyst can be optimized to yield higher quantum efficiency, and narrower and spatially uniform emission, when compared to the catalyst-assisted ones. Emission at energies lower than the band-edge is also found in both cases. By combining spatially-resolved photoluminescence and electron microscopy on the same nanowires, we show that catalyst-free nanowires exhibit a low-energy peak with sharp phonon replica, whereas for catalyst-assisted nanowires low-energy emission is linked to the presence of nanostructures with extended morphological defects.

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Authors and Affiliations

  1. Department of Engineering, University of Cambridge, Cambridge, CB3 0FA, UK

    Andrea Fasoli, Simone Pisana & Andrea C. Ferrari

  2. Nokia Research Centre, Broers Building (East Forum), Cambridge, CB3 0GT, UK

    Alan Colli

  3. Istituto per la Microelettronica e i Microsistemi del CNR, 00133, Rome, Italy

    Faustino Martelli

  4. SKLSM, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China

    Ping Heng Tan

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  1. Andrea Fasoli
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Correspondence to Andrea C. Ferrari.

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Fasoli, A., Colli, A., Martelli, F. et al. Photoluminescence of CdSe nanowires grown with and without metal catalyst. Nano Res. 4, 343–359 (2011). https://doi.org/10.1007/s12274-010-0089-2

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