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Structural and optical properties of Zn0.9 Mn0.1 O/ZnO core-shell nanowires designed by pulsed laser deposition

机译：脉冲激光沉积设计Zn0.9 Mn0.1 O / ZnO核壳纳米线的结构和光学性质

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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
机译：使用Au催化剂通过脉冲激光沉积在a-Al2O3和GaN（缓冲层）/ Si（111）衬底上制备了核壳ZnO / ZnMnO纳米线。在1150和550°C下烧结两个Mn含量为10％的ZnO靶，以便在它们中分别实现顺磁MnO2和铁磁Mn2O3相的控制。讨论了激光烧蚀的簇机制，该机理是将次级相掺入金属丝壳中的来源。在Ar +激光激发下的拉曼光谱显示出与Mn引起的无序有关的宽峰和A1-LO声子的红移。共振拉曼测量表明，Mn掺杂后，ZnO的无序性导致了多声子散射的增加。除紫外光发射外，在光致发光光谱中还观察到了由〜71 meV LO声子辅助的振动绿色发射带。具有光滑壳的核壳结构即使在室温下也显示出高的激子与绿带强度比（〜10）。©2009美国物理研究所

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