Optical properties of ZnSe and CdSe/ZnSe single nanowires.

Adrien Tribu 1Thomas Aichele 1Kuntheak Kheng 1Catherine Bougerol 1Régis André 1Serge Tatarenko 2

1. CEA Grenoble, Département de Recherche Fondamentale sur la Matière Condensée/SP2M, Grenoble 38054, France
2. Laboratoire de Spectrométrie Physique - CNRS UMR 5588 (SPECTRO), Université J. Fourier, BP87, Saint Martin d'Hères 38402, France

II-VI Quantum Dots (QD) obtained with the Stranski-Krastanow (S.K.) growth mode have the disadvantage to be randomly distributed (size and space) and to be of very high density. This makes all optical spectra of such QDs more complex to understand.

The interest of studying nanowires is lead by the possibility to form QDs:
    -    which are really isolated from each others (no wetting layer)
    -    whose sizeis defined by the nanowire’s diameter

    -    whose position can be controlled along the nanowire (this allows in particular to defined precisely the coupling between the QDs).
All these properties are very promising for the use of such nanowire-QDs as single photon emitter.
We have grown ZnSe and CdSe/ZnSe nanowires by MBE (Molecular Beam Epitaxy) in VLS (Vapour-Liquid-Solid) growth mode[1] catalysed on gold particles. Our nanowires have been characterised by high resolution SEM and TEM. Two growth modes have been observed depending on the growth conditions:

    -    longitudinal mode (Nanowire)

    -    longitudinal-transverse mode growth (nanoneedles)

The nanowires have been studied optically from low temperature to room temperature.

To our knowledge optical studies of CdSe/ZnSe nanowires have been reported up to now only on ensemble of nanowires (due to low emission efficiency). In contrast, the high quality of our nanowires allows us to carry out optical studies on single nanowire (both CdSe/ZnSe and pure ZnSe nanowire).

[1] K. Hiruma et al., J. Appl. Phys. 77, 2214 (1995); Y. Xia et al., Adv. Mat. 15, 353 (2003)


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Presentation: Poster at E-MRS Fall Meeting 2007, Symposium H, by Adrien Tribu
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-08-31 19:05
Revised:   2009-06-07 00:44