相互扩散和晶格失配对核/壳结构半导体纳米复合颗粒光谱和动力学性质的影响

项目名称： 相互扩散和晶格失配对核/壳结构半导体纳米复合颗粒光谱和动力学性质的影响

项目编号： No.11474101

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 蒋仲杰

作者单位： 华南理工大学

项目金额： 80万元

中文摘要： 核/壳结构半导体纳米复合颗粒具有荧光量子产率高和稳定性高等优点，是纳米材料领域的研究热点。但由于组成核/壳结构纳米复合颗粒的核和壳材料之间存在晶格参数的差异，壳的生长将改变核和壳材料的尺寸。另外，由于这种半导体纳米复合颗粒通常在高温下合成。高温容易导致核和壳材料的相互扩散。相互扩散将改变纳米复合颗粒沿径向的组成。半导体纳米复合颗粒的光谱和动力学性质与其尺寸和组成密切相关。由此可见，晶格失配和相互扩散将影响核/壳结构半导体纳米复合颗粒的光谱和动力学性质。到目前为止，尽管晶格失配和相互扩散对核/壳结构半导体纳米复合颗粒的影响已受到科技工作者的注意，但晶格失配和相互扩散影响其光谱和动力学性质的详细研究相对较少。因此，本项目将着重研究晶格失配和相互扩散对核/壳结构半导体纳米复合颗粒光谱和动力学性质的影响，这对设计和调控颗粒的性质、提高半导体量子器件的性能具有十分重要意义。

中文关键词： 相互扩散；晶格失配；核/壳结构；半导体纳米晶；载流子动力学

英文摘要： Due to their high fluorescent quantum yield and good photostability, semiconductor nanocrystals with a core/shell structure have been extensively investigated. However, owing to the difference in the lattice mismatch between core and shell materials, the growth of shell would greatly change the dimensions of the core and shell materials. Additionally, because the core/shell semiconductor nanocrystals are usually synthesized at the relatively high temperatures, which will induce the occurrence of interdiffusion of the core/shell materials and change the composition of the core/shell materials along their radial direction. The spectroscopic and dynamic properties of the core/shell semiconductor nanocrystals are greatly dependent upon their dimension and composition, due to the quantum confinement effect. In this sense, the lattice mismatch and the interdiffusion will change the spectroscopic and dynamic properties of the core/shell semiconductor nanocrystals. Up to now, although the lattice mismatch and interdiffusion have been noticed in the core/shell semiconductor nanocrystals, the detailed investigation of their effects on the spectroscopic and dynamic properties of the core/shell semiconductor nanocrystals have been less reported in the literatures. The present project is therefore proposed to investigate the effects of the lattice mismatch and interdiffusion on the spectroscopic and dynamic properties of the core/shell semiconductor nanocrystals. The influence of the lattice mismatch and interdiffusion on the distribution of electron and hole wave functions and the positions of conduction and valence band edges will be studied, which is of great significance for designing and controlling of the properties of the core/shell semiconductor nanocrystals and improving the performance of semiconductor quantum devices.

英文关键词： interdiffusion;lattice mismatch;core/shell structure;semiconductor nanocrystal;carrier dynamics