Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/6129
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 Catalysts Elemental semiconductors Excitons Ferromagnetic materials Ferromagnetic-paramagnetic transitions Gallium compounds III-V semiconductors II-VI semiconductors Nanofabrication Nanowires Paramagnetic materials Photoluminescence Pulsed laser deposition Raman spectra Red shift Semiconductor quantum wires Semimagnetic semiconductors Silicon Sintering 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 |
URI: | http://hdl.handle.net/10773/6129 |
DOI: | 10.1063/1.3253572 |
ISSN: | 0021-8979 |
Appears in Collections: | DFis - Artigos I3N-FSCOSD - Artigos |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
JAPL.pdf | versão pdf do editor | 536.69 kB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.