Nano Research

, Volume 4, Issue 4, pp 343–359 | Cite as

Photoluminescence of CdSe nanowires grown with and without metal catalyst

  • Andrea Fasoli
  • Alan Colli
  • Faustino Martelli
  • Simone Pisana
  • Ping Heng Tan
  • Andrea C. Ferrari
Research Article

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.

Keywords

CdSe nanowires photoluminescence 

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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • Andrea Fasoli
    • 1
  • Alan Colli
    • 2
  • Faustino Martelli
    • 3
  • Simone Pisana
    • 1
  • Ping Heng Tan
    • 4
  • Andrea C. Ferrari
    • 1
  1. 1.Department of EngineeringUniversity of CambridgeCambridgeUK
  2. 2.Nokia Research CentreCambridgeUK
  3. 3.Istituto per la Microelettronica e i Microsistemi del CNRRomeItaly
  4. 4.SKLSM, Institute of SemiconductorsChinese Academy of SciencesBeijingChina

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