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Title: Structural and optical properties of Zn0.9 Mn0.1 O/ZnO core-shell nanowires designed by pulsed laser deposition
Author: Kaydashev, V.E.
Kaidashev, E.M.
Peres, M.
Monteiro, T.
Correia, M.R.
Sobolev, N.A.
Alves, L.C.
Franco, N.
Alves, E.
Keywords: Alumina
Elemental semiconductors
Ferromagnetic materials
Ferromagnetic-paramagnetic transitions
Gallium compounds
III-V semiconductors
II-VI semiconductors
Paramagnetic materials
Pulsed laser deposition
Raman spectra
Red shift
Semiconductor quantum wires
Semimagnetic semiconductors
Ultraviolet spectra
Wide band gap semiconductors
Zinc compounds
Issue Date: 3-Nov-2009
Publisher: AIP
Abstract: Core-shell ZnO/ZnMnO nanowires on a-Al2O3 and GaN (buffer layer)/Si (111) substrates were fabricated by pulsed laser deposition using a Au catalyst. Two ZnO targets with a Mn content of 10% were sintered at 1150 and 550 °C in order to achieve the domination in them of paramagnetic MnO2 and ferromagnetic Mn2O3 phases, respectively. Cluster mechanism of laser ablation as a source of possible incorporation of secondary phases to the wire shell is discussed. Raman spectroscopy under excitation by an Ar+ laser revealed a broad peak related to the Mn-induced disorder and a redshift in the A1-LO phonon. Resonant Raman measurements revealed an increase in the multiphonon scattering caused by disorder in ZnO upon doping by Mn. Besides the UV emission, a vibronic green emission band assisted by a ∼ 71 meV LO phonon is also observed in the photoluminescence spectra. Core-shell structures with smooth shells show a high exciton to green band intensity ratio ( ∼ 10) even at room temperature. © 2009 American Institute of Physics
Description: Partilhar documento na coleção da comunidade Laboratório Associado I3N
Peer review: yes
DOI: 10.1063/1.3253572
ISSN: 0021-8979
Appears in Collections:DFis - Artigos
I3N-FSCOSD - Artigos

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