Research Article


2011, 4(4): 343–359


Photoluminescence of CdSe Nanowires Grown with and without Metal Catalyst

Andrea Fasoli1, Alan Colli2, Faustino Martelli3, Simone Pisana1, Ping Heng Tan4, and Andrea C. Ferrari1 ()

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1 Department of Engineering, University of Cambridge, Cambridge CB3 0FA, UK2 Nokia Research Centre, Broers Building (East Forum), Cambridge CB3 0GT, UK3 Istituto per la Microelettronica e i Microsistemi del CNR, 00133 Rome, Italy4 SKLSM, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

Keywords: KEYWORDS CdSe, nanowires, photoluminescence
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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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Photoluminescence of CdSe Nanowires Grown with and without Metal Catalyst. Nano Res. 2011, 4(4): 343–359

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