Cd1-xZnxS纳米晶中的声子限制和替位无序
Phonon confinement and substitutional disorder in Cd1-xZnxS Nanocrystals
摘要：
用拉曼光谱研究了化学沉淀法合成的Cd_（1-x）Zn_xS自支撑混合纳米晶中的~ 1 LO光学声子。正如预期的纳米晶体，1-LO模式被发现出现在略低于波数比那些在散装混合晶体，并表现出一个模式的行为。另一方面，线加宽被发现是远远超过可以占的基础上的声子限制。从详细的线形分析，结果表明，在混合晶体中的替代无序的贡献更大的线加宽比声子限制。从这些机制所产生的线宽也提取的分析。
英文摘要：
1LO optical phonons in free-standing mixed Cd1-xZnxS nanocrystals, synthesized using chemical precipitation, are investigated using Raman spectroscopy. As expected for the nanocrystals, the 1-LO modes are found to appear at slightly lower wavenumbers than those in the bulk mixed crystals and exhibit one mode behavior. On the other hand, the line broadening is found to be much more than that can be accounted on the basis of phonon confinement. From the detailed line shape analysis it turns out that the substitutional disorder in the mixed crystals contributes much more to the line broadening than the phonon confinement. The linewidth arising from these mechanisms are also extracted from the analysis.
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