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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Microstructure and optical properties of phase-change Ge-Sb-Te nanoparticles grown by pulsed-laser ablation
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Microstructure and optical properties of phase-change Ge-Sb-Te nanoparticles grown by pulsed-laser ablation

机译：脉冲激光烧蚀生长相变Ge-Sb-Te纳米颗粒的微观结构和光学性质

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摘要

Phase-change Ge-Sb-Te (GST) nanoparticles have been in-situ synthesized by a pulsed-laser ablation method. During the ablation process, growth parameters including temperature of heat treatment, pressure, and laser fluence are extensively explored. Scanning and transmission electron microscopy are used to study microstructure and phase formation of the nanoparticles. Fourier transform analysis of electron micrographs exhibits an evidence of existence of the stoichiometric single GST-225 phase. We have measured micro-Raman scattering spectra of commercially available GST-124, -147, and -225 bulk and GST nanoparticles. Lack of the amorphous Te-Te stretching mode near 150 cm(-1) from the Raman spectra of the bulk samples indicates that the samples are well-crystallized. From the measurements of GST nanoparticles with different growth conditions, we could get information towards the optimal growth conditions for better crystalline quality of the GST nanoparticles. Our results suggest that micro-Raman scattering spectroscopy can be used to study phases and phase changes in the GST bulk crystals and nanoparticles through local structural information, which is being developed for low-power non-volatile memory applications. (c) 2006 Elsevier B.V. All rights reserved.
机译：相变Ge-Sb-Te（GST）纳米粒子已通过脉冲激光烧蚀法原位合成。在烧蚀过程中，广泛研究了包括热处理温度，压力和激光能量密度在内的生长参数。扫描和透射电子显微镜用于研究纳米颗粒的微观结构和相形成。电子显微照片的傅里叶变换分析显示存在化学计量的单个GST-225相。我们已经测量了市售GST-124，-147和-225本体和GST纳米粒子的微拉曼散射光谱。从大块样品的拉曼光谱中缺少150 cm（-1）附近的非晶Te-Te拉伸模式表明样品结晶良好。通过测量具有不同生长条件的GST纳米颗粒，我们可以获得有关最佳生长条件的信息，以获取更好的GST纳米颗粒的晶体质量。我们的研究结果表明，微拉曼散射光谱技术可用于通过局部结构信息研究GST块状晶体和纳米粒子中的相和相变，这是针对低功率非易失性存储应用而开发的。 （c）2006 Elsevier B.V.保留所有权利。

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