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The fingerprint of Te-rich and stoichiometric Bi2Te3 nanowires by Raman spectroscopy

机译:富Te和化学计量比的Bi2Te3纳米线的拉曼光谱指纹图谱

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摘要

We unambiguously show that the signature of Te-rich bismuth telluride is the appearance of three new peaks in the Raman spectra of Bi2Te3, located at 88, 117 and 137 cm(-1). For this purpose, we have grown stoichiometric Bi2Te3 nanowires as well as Te-rich nanowires. The absence of these peaks in stoichiometric nanowires, even in those with the smallest diameter, shows that they are not related to confinement effects or the lack of inversion symmetry, as stated in the literature, but to the existence of Te clusters. These Te clusters have been found in non-stoichiometric samples by high resolution electron microscopy, while they are absent in stoichiometric samples. The Raman spectra of the latter corresponds to the one for bulk Bi2Te3. The intensity of these Raman peaks are clearly correlated to the Te content. In order to ensure statistically meaningful results, we have investigated several regions from every sample.
机译:我们清楚地表明,富Te碲化铋的特征是在Bi2Te3的拉曼光谱中出现了三个新峰,分别位于88、117和137 cm(-1)。为此,我们已经生长了化学计量的Bi2Te3纳米线以及富含Te的纳米线。在化学计量的纳米线中,即使在具有最小直径的纳米线中,也没有这些峰,这表明它们与约束效应或文献中所述的缺乏反转对称性无关,而是与Te团簇的存在有关。这些Te团簇已通过高分辨率电子显微镜在非化学计量样品中发现,而在化学计量样品中却不存在。后者的拉曼光谱对应于块状Bi2Te3的拉曼光谱。这些拉曼峰的强度与Te含量明显相关。为了确保统计上有意义的结果,我们对每个样本的几个区域进行了调查。

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