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首页> 外文期刊>Physica, B. Condensed Matter >Raman spectroscopy of CdS nanocrystalline semiconductors
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Raman spectroscopy of CdS nanocrystalline semiconductors

机译：CdS纳米晶体半导体的拉曼光谱

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Raman scattering measurements were performed on nanostructured II-VI semiconductor CdS prepared by a chemical route. The Raman spectrum shows a low-frequency wing at 295 cm~(-1) besides the characteristic first-order longitudinal optical phonon (1LO) mode at 305 cm~(-1) when excited with a laser of wavelength 457.9 em. The observed variation of the Raman shifts, widths and intensities of these two lines with the size of the nanoparticles is consistent with the interpretation that the low-frequency peak is a surface phonon (SP) mode. Increasing the wavelength of the exciting laser lowers the intensity of the LO mode, while shifting the lower-frequency SP mode to the higher-frequency side and simultaneously increases its width. This anomalous behavior is attributed to the possible electron hole excitation by the SP due to the presence of a continuum of localized and acceptor states within CdS band gap. The effect of temperature, on these modes, is also studied and discussed.
机译：拉曼散射测量是对通过化学路线制备的纳米结构II-VI半导体CdS进行的。当用波长为457.9 em的激光激发时，拉曼光谱还显示出295 cm〜（-1）处的低频机翼，以及305 cm〜（-1）处的特征性一阶纵向光学声子（1LO）模式。观察到的这两条线的拉曼位移，宽度和强度随纳米粒子大小的变化与以下解释一致：低频峰是表面声子（SP）模式。增加激发激光器的波长会降低LO模式的强度，同时将低频SP模式移至高频侧并同时增加其宽度。这种异常行为归因于SP可能的电子空穴激发，这是由于CdS带隙内存在连续的局部和受体状态。还研究了温度对这些模式的影响。

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