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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 Press
Publication date: 
1 Apr 2011

Andrea Fasoli, Alan Colli, Faustino Martelli, Simone Pisana, Ping Heng Tan, Andrea C Ferrari

Biblio References: 
Volume: 4 Issue: 4 Pages: 343-359
Nano Research