Photoluminescence of CdSe nanowires grown with and without metal catalyst
CdSe, nanowires, photoluminescence
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.
Tsinghua University Press
Andrea Fasoli,Alan Colli,Faustino Martelli,Simone Pisana,Ping Heng Tan,Andrea C. Ferrari, Photoluminescence of CdSe nanowires grown with and without metal catalyst. NanoRes.2011, 4(4): 343–359