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首页> 外文期刊>The Journal of Chemical Physics >Size-dependent bandgap and particle size distribution of colloidal semiconductor nanocrystals
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Size-dependent bandgap and particle size distribution of colloidal semiconductor nanocrystals

机译：胶体半导体纳米晶体的尺寸依赖性带隙和粒度分布

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摘要

A new analytical expression for the size-dependent bandgap of colloidal semiconductor nanocrystals is proposed within the framework of the finite-depth square-well effective mass approximation in order to provide a quantitative description of the quantum confinement effect. This allows one to convert optical spectroscopic data (photoluminescence spectrum and absorbance edge) into accurate estimates for the particle size distributions of colloidal systems even if the traditional effective mass model is expected to fail, which occurs typically for very small particles belonging to the so-called strong confinement limit. By applying the reported theoretical methodologies to CdTe nanocrystals synthesized through wet chemical routes, size distributions are inferred and compared directly to those obtained from atomic force microscopy and transmission electron microscopy. This analysis can be used as a complementary tool for the characterization of nanocrystal samples of many other systems such as the II-VI and III-V semiconductor materials. Published by AIP Publishing.
机译：在有限深度方形井有效质量近似的框架内提出了胶体半导体纳米晶体的尺寸相关带隙的新分析表达，以便提供量子限制效果的定量描述。这使得即使预期传统的有效质量模型失败，也可以将光学光谱数据（光致发光光谱和吸光度边缘）转换为胶体系统的粒度分布的准确估计，这通常是用于属于所在的非常小的颗粒的非常小的粒子称为强大的监禁限制。通过将报告的理论方法应用于通过湿化学途径合成的CdTe纳米晶体，将尺寸分布推断并直接与原子力显微镜和透射电子显微镜获得的那些。该分析可用作互补工具，用于表征许多其他系统的纳米晶样品，例如II-VI和III-V半导体材料。通过AIP发布发布。

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