Research Article

Nano Research

, Volume 4, Issue 4, pp 343-359

Photoluminescence of CdSe nanowires grown with and without metal catalyst

  • Andrea FasoliAffiliated withDepartment of Engineering, University of Cambridge
  • , Alan ColliAffiliated withNokia Research Centre
  • , Faustino MartelliAffiliated withIstituto per la Microelettronica e i Microsistemi del CNR
  • , Simone PisanaAffiliated withDepartment of Engineering, University of Cambridge
  • , Ping Heng TanAffiliated withSKLSM, Institute of Semiconductors, Chinese Academy of Sciences
  • , Andrea C. FerrariAffiliated withDepartment of Engineering, University of Cambridge Email author 

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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.
http://static-content.springer.com/image/art%3A10.1007%2Fs12274-010-0089-2/MediaObjects/12274_2010_89_Fig1_HTML.jpg

Keywords

CdSe nanowires photoluminescence