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Correlation Between Microstructure and Optical Properties of ZnO Based Nanostructures Grown by MOCVD

Published online by Cambridge University Press:  01 February 2011

Farid Falyouni ,
Julien Barjon ,
Vincent Sallet ,
Alain Lusson ,
Guy Garry  and
Pierre Galtier
Farid Falyouni
Affiliation:
farid.falyouni@cnrs-bellevue.fr, Université de Versailles Saint Quentin-Centre National de la Recherche Scientifique, Groupe d'Etude de la Matière Condensée-GEMaC, 45, avenue des Etats-Unis, Versailles, 78035, France
Julien Barjon
Affiliation:
julien.barjon@uvsq.fr, Université de Versailles Saint Quentin-Centre National de la Recherche Scientifique, Groupe d'Etude de la Matière Condensée-GEMaC, 45, avenue des Etats-Unis, Versailles, 78035, France
Vincent Sallet
Affiliation:
vincent.sallet@cnrs-bellevue.fr, Université de Versailles Saint Quentin-Centre National de la Recherche Scientifique, Groupe d'Etude de la Matière Condensée-GEMaC, 45, avenue des Etats-Unis, Versailles, 78035, France
Alain Lusson
Affiliation:
alain.lusson@cnrs-bellevue.fr, Université de Versailles Saint Quentin-Centre National de la Recherche Scientifique, Groupe d'Etude de la Matière Condensée-GEMaC, 45, avenue des Etats-Unis, Versailles, 78035, France
Guy Garry
Affiliation:
guy.garry@thalesgroup.com, Thales Research & Technology France, RD 128, Palaiseau, 91767, France
Pierre Galtier
Affiliation:
pierre.galtier@uvsq.fr, Université de Versailles Saint Quentin-Centre National de la Recherche Scientifique, Groupe d'Etude de la Matière Condensée-GEMaC, 45, avenue des Etats-Unis, Versailles, 78035, France
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Abstract

The correlation between structural properties of ZnO sharp conical needles grown by Metallorganic Chemical Vapor Deposition (MOCVD) on sapphire substrate and their optical signature measured by low temperature cathodoluminescence (CL) is investigated. Transmission Electron Microscopy (TEM) shows the excellent structural properties of these needles from their base up to the end of the tip. In order to probe the emission of the needles along their length, UV CL mapping has been performed at low temperature on a single needle previously characterized by TEM. A clear blue shift of 25meV is observed for the excitonic emission close to the needle tip. This shift is too high to be fully attributed to quantum confinement. Although, it qualitatively agrees with previous observations which assigned it to a surface contribution becoming dominant upon size shrinking, the effect is less pronounced. The results are discussed in term of surface quality and other possible contributions associated to a decrease of the n-dopant concentration and to quantum confinement effect close to the tip.

Keywords

nanostructureII-VItransmission electron microscopy (TEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1074: Symposium I – Synthesis and Metrology of Nanoscale Oxides and Thin Films , 2008 , 1074-I07-08
Copyright
Copyright © Materials Research Society 2008

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References

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