Article Title

Photoluminescence of CdSe nanowires grown with and without metal catalyst

Authors

Andrea Fasoli, Department of Engineering, University of Cambridge, Cambridge CB3 0FA, UK
Alan Colli, Nokia Research Centre, Broers Building (East Forum), Cambridge CB3 0GT, UK
Faustino Martelli, Istituto per la Microelettronica e i Microsistemi del CNR, 00133 Rome, Italy
Simone Pisana, Department of Engineering, University of Cambridge, Cambridge CB3 0FA, UK
Ping Heng Tan, SKLSM, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
Andrea C. Ferrari, Department of Engineering, University of Cambridge, Cambridge CB3 0FA, UK

Keywords

CdSe, nanowires, photoluminescence

Abstract

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.

Graphical Abstract

DOI

https://doi.org/10.1007/s12274-010-0089-2

Publisher

Tsinghua University Press

Recommended Citation

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