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首页> 外文期刊>Physical Review, B. Condensed Matter >Temperature-dependent Raman scattering studies in nanocrystalline silicon and finite-size effects
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Temperature-dependent Raman scattering studies in nanocrystalline silicon and finite-size effects

机译：纳米晶体硅中依赖温度的拉曼散射研究和有限尺寸效应

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摘要

A comparative study of the temperature-dependent Raman scattering of nanocrystalline and bulk silicon is presented. The nanocrystalline silicon samples were made by a cw laser annealing process, and the characteristic dimensions were determined with a phenomenological phonon confinement model. Experimental results indicate a higher degree of anharmonicity in nanocrystals compared to that in the bulk. The anharmonic constants are found to be highly size dependent and increase greatly with decreasing dimensions. The phonon lifetimes have two contributions, one temperature dependent and the other temperature independent, both decreasing rapidly with decreasing nanocrystal size. The temperature-dependent term tau (0) is important for larger nanocrystals, while the temperature-independent term tau (1) becomes dominant for nanocrystals of sizes less than 4 nm. [References: 24]
机译：提出了对温度依赖性拉曼散射的纳米晶体和块状硅的比较研究。通过连续激光退火工艺制备纳米晶硅样品，并用现象学的声子约束模型确定特征尺寸。实验结果表明，与本体相比，纳米晶体的非谐性更高。发现非调和常数高度依赖于尺寸，并且随着尺寸减小而大大增加。声子寿命有两个贡献，一个与温度有关，另一个与温度无关，两者都随着纳米晶体尺寸的减小而迅速减小。温度相关项tau（0）对于较大的纳米晶体很重要，而温度相关项tau（1）对于尺寸小于4 nm的纳米晶体而言则占主导地位。 [参考：24]

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